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Solutions Search - Supercap, Capacitor & Battery Back-Up Solutions

Linear Technology's family of Supercap and Battery backup ICs do all the hard stuff with their simple and full featured solutions, providing back-up power if the main supply rail should fail. When a system rail is powered, our ICs can charge and balance multiple Supercaps, or a battery, for backup energy storage. Should the system power fail, these ICs can immediately use their stored energy to power the downstream load. We have a broad range of device topologies, with wide input voltage ranges and high charge currents, so it’s easy to select the right product for your systems backup power needs.

Product Icharge Vin Vout Topology
LTC3225 0.15A 2.8V - 5.5V 4.8V/5.3V Boost Charge Pump SCap Charger
LTC3226 0.33A 2.5V - 5.5V 2.5V - 5.5V Boost Charge Pump + Power Path Manager for SCaps
LTC3625 1A 2.7V - 5.5V 4V - 5.3V Buck + Boost SCap Charger
LTC3355 1A 3V - 20V 2.7V - 5.5V Buck SCap Charger + Boost Backup
LTC3110 2A 0.1V - 5.5V 1.8V - 5.5V Bi-Directional Buck-Boost + Power Path Manager for SCaps
LTC3643 2A 3V - 17V Up to 40V Bi-Directional Boost Charger/Buck Backup, Electrolytic Caps
LTC4040 2.5A 3.5V - 5.5V 3.5V - 5V Buck Battery Charger + Boost Backup for Li Batteries
LTC3128 3A 1.7V - 5.5V 1.8V - 5.5V Buck-Boost SCap Charger
LTC4425 3A 1.7V - 5.5V 2.7V - 5.5V Linear/Ideal Diode SCap Charger
LTC4110 3A 4.5V - 19V 2.7V - 19V Bi-Directional Buck-Boost Flyback Controller
LTC3350 10A+ 4.5V - 35V 4V - 35V Bi-Directional Controller + Monitor + PowerPath for SCaps

Browse our list of supercap, capacitor and battery back-up solutions below or search our parametric tables for supercapacitor chargers or battery charger products



LTC3112 5V Backup Supply from Supercap Runs Down to VIN = 2V with 250mA Load

Sep 9th 2016
The LTC®3112 is a fixed frequency synchronous buck-boost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage. ...

Circuit 

 

LTC3245 Wide VIN 5V Supply with Battery Backup

Sep 2nd 2016
The LTC3245 is a switched capacitor buck-boost DC/DC converter that produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. The device uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to ...

Circuit 

 

LTC3130 3.3V Converter with "Last Gasp" Hold-Up, Runs Storage Capacitor Down to 0.9V

Aug 15th 2016
The LTC3130/LTC3130-1 are high efficiency, low noise, 600mA buck-boost converters with wide VIN and VOUT ranges. For high efficiency operation at light loads, BurstMode operation can be selected, reducing the quiescent current to just 1.6µA. Converter start-up is achieved from sources as low as 7.5µW. ...

Circuit 

 

DC2220A - LTC3643 Demo Board | 2A, Bidirectional 40V Boost Charger/Buck Back-Up Power Regulator, 3V ≤ VIN ≤ 17V (Boost), Vout = 5V @ 2A/3A/4A (Buck)

Nov 23rd 2015
Demonstration circuit 2220A is a 2A, bidirectional charger/ regulator featuring the LTC®3643, a bidirectional synchronous step-up charger and step-down converter. DC2220A implements backup by charging a storage capacitor up to approximately 40V in boost mode, when the input voltage is present. It discharges the storage capacitor ...

Demo Board 

 

LTC3643 5V Backup System with VIN From 5V to 60V

Nov 4th 2015
The LTC®3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charges a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator ...

Circuit 

 

LTC3643 12V Backup System for Automotive Applications

Nov 4th 2015
The LTC®3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charges a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator ...

Circuit 

 

DC2118A - LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager

Sep 3rd 2015
Demonstration circuit 2118A is a combination step-down battery charger and step-up battery backup regulator using the LTC®4040 monolithic system power manager. The DC2118A has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored ...

Demo Board 

 

LTC3335 Li-Ion Backup Power Supply

Aug 31st 2015
The LTC®3335 is a high efficiency, low quiescent current (680nA) buck-boost DC/DC converter with an integrated precision coulomb counter which monitors accumulated battery discharge in long life battery powered applications. The buck-boost can operate down to 1.8V on its input and provides eight pin-selectable output voltages ...

Circuit 

 

LTC3110 3.3V/2A Output from Stack of Supercapacitors Backup/Recharge Application with Active Voltage Balancing

Aug 27th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3110 1.8V/300mA Output from Single Capacitor Discharged from 2.5V to 1V and with Reserve Available Down to 0.3V

Aug 27th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3110 500mA USB Charge/Backup Application with Variable Charging Power, PCHRG, Depending on System Load

Aug 27th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3110 Autonomous Backup and Recharge Application with Input Isolation Switch

Aug 27th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3110 Lead Acid Battery Backup/Recharge Application

Aug 27th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3121 Dual Supercapacitor Backup Power Supply, 0.5V to 5V

Aug 27th 2015
The LTC®3121 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 1.5A current limit along with the ability to program output voltages up to 15V makes the LTC3121 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to ...

Circuit 

 

LTC4040 4.5V Backup Application with 4.22V PFI Threshold (Charge Current Setting: 1A, Input Current Limit Setting: 2A)

Jul 15th 2015
The LTC®4040 is a complete 3.5V to 5.5V supply rail battery backup system. It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery. When external power is available, the step-up regulator operates in reverse as a step-down battery charger. ...

Circuit 

 

LTC4040 5V Backup System with 12V Buck ior Automotive Application(Charge Current Setting: 1A, Input Current Limit Setting: 2A)

Jul 15th 2015
The LTC®4040 is a complete 3.5V to 5.5V supply rail battery backup system. It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery. When external power is available, the step-up regulator operates in reverse as a step-down battery charger. ...

Circuit 

 

LTC4040 5V Backup Application with OVP Protection and Non-Backed Up Load Option (Charge Current Setting: 2.5A, Input Current Limit Setting: 4A)

Jul 15th 2015
The LTC®4040 is a complete 3.5V to 5.5V supply rail battery backup system. It contains a high current step-up DC/DC regulator to back up the supply from a single-cell Li-Ion or LiFePO4 battery. When external power is available, the step-up regulator operates in reverse as a step-down battery charger. ...

Circuit 

 

LTC3110 - 2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer

Jun 17th 2015
The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching ...

Circuit 

 

LTC3118 System Power (Priority) or 3-Cell Li-Ion to 5V VOUT Regulator with Automatic Burst Mode Operation

Mar 19th 2015
The LTC®3118 is a dual-input, wide voltage range synchronous buck-boost DC/DC converter with an intelligent, integrated, low-loss PowerPath control. The unique power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability ...

Circuit 

 

LTC3118 Dual Battery System to 3.3V VOUT, Runs from Lead Acid (Priority) When Present Automatic Burst Mode Operation

Mar 19th 2015
The LTC®3118 is a dual-input, wide voltage range synchronous buck-boost DC/DC converter with an intelligent, integrated, low-loss PowerPath control. The unique power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability ...

Circuit 

 

LTC3890 & LTC4000 60V Input DC/DC Power Supply with Battery Backup

Victor Khasiev - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Feb 27th 2015
Introduction Circuitry presented in this article can be very useful for designing compact power supplies and extremely beneficial for system functioning in conditions of input power interruptions. The presented solution can be embedded into uninterruptible power systems or small standalone modules. It can be successfully employed ...

Blog Post Circuit LTspice 

 

LTC3118 12V VIN to 5V VOUT Converter with Capacitor Backup Runs from VIN1 (Priority) in Normal Mode, VIN2 During Backup Event

Feb 24th 2015
The LTC®3118 is a dual-input, wide voltage range synchronous buck-boost DC/DC converter with an intelligent, integrated, low-loss PowerPath control. The unique power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability ...

Circuit 

 

LTC3350 25V to 35V, 6.4A Supercapacitor Charger with 2A Input Current Limit and 28V, 50W Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 11V to 20V, 5.3A LiFePO4 Battery Charger with 4.6A Input Current Limit and 12V, 48W Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 11V to 20V, 16A Supercapacitor Charger with 6.4A Input Current Limit and 10V, 60W Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 11V to 20V, 4A Supercapacitor Charger with 2A Input Current Limit and 5V, 2A Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 11V to 35V, 4A Supercapacitor Charger with 2A Input Current Limit and 10V, 1A Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 11V to 15V, 2.3A Zeta-SEPIC High Voltage Capacitor Charger with 2A Input Current Limit and 10V, 25W Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 4.8V to 12V, 10A Supercapacitor Charger with 6.4A Input Current Limit and 5V, 30W Backup Mode

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3350 12V PCle Backup Controller

Aug 8th 2014
The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can ...

Circuit 

 

LTC3225 5V Supercapacitor Back-Up Supply

Aug 7th 2014
The LTC3225/LTC3225-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a selectable fixed output voltage (4.8V/5.3V for the LTC3225 and 4V/4.5V for the LTC3225-1) from input supplies as low as 2.8V to 5.5V. Automatic cell balancing prevents overvoltage damage to either supercapacitor. ...

Circuit LTspice 

 

LT8710 300kHz, SuperCap Backup Power

Jan 15th 2014
The LT8710 is a synchronous PWM DC/DC controller with a rail-to-rail output current monitor and control. The LT8710 is ideal for many types of power supply topologies and can be easily configured for boost, SEPIC, inverting, or flyback configurations. The LT8710’s rail-to-rail output current monitor and control allows ...

Circuit 

 

LTC3111 3.3V Backup from a High Voltage Capacitor Bank Runs Down to VIN = 2V with 500mA Load

Dec 9th 2013
The LTC3111 is a fixed frequency, synchronous buckboost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage. With an input and output range of 2.5V to 15V, the LTC3111 ...

Circuit 

 

LT8705 Bi-Directional Buck-Boost Supercapacitor Backup Supply

Jan 7th 2013
The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The part has integrated input current, input voltage, output current and output voltage feedback loops. With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705 ...

Circuit LTspice 

 

Priority Switching from 12V Main Supply to 14.8V Battery Backup

Nov 27th 2012
The LTC4417 connects one of three valid power supplies to a common output based on priority. Priority is defined by pin assignment, with V1 assigned the highest priority and V3 the lowest priority. A power supply is defined as valid when its voltage has been within its overvoltage (OV) and undervoltage (UV) window continuously ...

Circuit LTspice 

 

Dual Supercapacitor Backup Power Supply, 0.5V to 5V

Jul 30th 2012
The LTC3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV, ...

Circuit LTspice 

 

SuperCap Backup Power

Jan 12th 2012
The LT8582 is a dual independent channel PWM DC/DC converter with a power good pin and built-in fault protection to help guard against input overvoltage and overtemperature conditions. Each channel consists of a 42V master switch and a 42V slave switch that can be tied together for a total current limit of 3A. ...

Circuit 

 

Supercapacitor Based Backup Power Supply

Jul 26th 2011
In this application, two series of supercapacitors are charged to 5V during normal operation to provide the needed backup energy in case the primary power fails. As long as the primary power is present, the LTC3536 remains in Burst Mode operation with very low quiescent current, minimizing drain on the backup storage capacitor. ...

Circuit LTspice 

 

LTC3226 Li-Ion Backup Supply

Jul 8th 2011
The LTC3226 is a 2-cell series supercapacitor charger with a backup PowerPath controller. It includes a charge pump supercapacitor charger with programmable output voltage, a low dropout regulator, and a power-fail comparator for switching between normal and backup modes. The constant input current supercapacitor charger is ...

Circuit 

 

Supercap Powered Backup Supply

Nov 23rd 2010
The LTC3113 is a wide VIN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides low noise operation, making it well suited for RF and precision measurement applications. The LTC3113 can ...

Circuit 

 

5V Backup Supply from Supercap Runs Down to VIN = 2V with 250mA Load

Nov 16th 2010
The LTC3112 is a fixed frequency synchronous buck-boost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage. With an input range of 2.7V to 15V, the LTC3112 is well ...

Circuit 

 

LTC3625 Power Backup Using Supercapacitors and Optional Keep-Alive Cell

Apr 1st 2010
The LTC4415 contains two monolithic PowerPath ideal diodes, each capable of supplying up to 4A with typical forward conduction resistance of 50mΩ. The diode voltage drops are regulated to 15mV during forward conduction at low currents, extending the power supply operating range and ensuring no oscillations during supply ...

Circuit 

 

Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter

Apr 1st 2010
The LTC4415 contains two monolithic PowerPath ideal diodes, each capable of supplying up to 4A with typical forward conduction resistance of 50mΩ. The diode voltage drops are regulated to 15mV during forward conduction at low currents, extending the power supply operating range and ensuring no oscillations during supply ...

Circuit 

 

LTC4425 Redundant USB & 3xAA High Peak Power Battery Supplies using Two Supercapacitors

Mar 3rd 2010
The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low ...

Circuit 

 

LTC4425/LTC3663 12V Input to 5V Outputs High Peak-Power & Backup Supply using Two Supercapacitors with Input Voltage Monitoring

Jul 20th 2009
The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low ...

Circuit 

 

Battery Backup System Manager Controlling a Six-Series Cell SLA Battery with Temperature Compensation

May 5th 2008
The LTC4110 is a complete single chip, high efficiency, flyback battery charge and discharge manager with automatic switchover between the input supply and the backup battery or super capacitor. The IC provides four modes of operation: battery backup, battery charge, battery calibration and shutdown. Battery backup and battery ...

Circuit 

 

Power Backup System Using Supercapacitors

Apr 5th 2007
This circuit shows a power holdup system that incorporates a supercapacitor stack with the capacity to provide standby power of 165mW for about 45 seconds in the absence of battery power. An LDO converts the output of the supercapacitor stack to a constant voltage supply during backup mode. ...

Circuit 

 

LTC4425/LTC3533 3.3V at 1.5A from 5V Peak-Power & Back-up Supply using Two Supercapacitors

Mar 15th 2007
The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low ...

Circuit 

 

12V Automatic PowerPath Switchover (Vbackup > Vprimary)

Oct 31st 2006
The LTC4416 control two sets of external P-channel MOSFETs to create two near ideal diode functions for power switchover circuits. This permits highly efficient OR’ing of multiple power sources for extended battery life and low self heating. ...

Circuit 

 

12V Automatic PowerPath Switchover (Vprimary > Vbackup)

Oct 31st 2006
The LTC4416 control two sets of external P-channel MOSFETs to create two near ideal diode functions for power switchover circuits. This permits highly efficient OR’ing of multiple power sources for extended battery life and low self heating. ...

Circuit 

 

Buck-Boost Converter In SuperCap Backup Power Supply

Oct 10th 2006
The LTC3536 is an extended VIN range, fixed frequency, synchronous buck-boost DC/DC converter that operates from input voltages above, below or equal to the regulated output voltage. The topology incorporated in the LTC3536 provides low noise operation, making it ideal for RF and precision measurement applications. ...

Circuit 

 

LTC3128 5.0V to 3.3V Converter with Power Ride-Through

Jan 6th 2005
The LTC®3128 is a highly efficient, buck-boost DC/DC supercapacitor charger. It operates efficiently from input voltages above, below or equal to the output voltage. The LTC3128 incorporates accurate programmable average input current limit, active charge balancing and programmable maximum capacitor voltage. This combination ...

Circuit 

 

Pushbutton on/off control for battery-powered device, with automatic turn-on when the device is plugged in

Jun 5th 2002
This circuit shows a typical LTC2955-1 application for a handheld device. The 3.6V supply is produced directly from the handheld’s battery; the 12V secondary supply comes from a wall adapter. Both the 3.6V and 12V inputs are connected to the LT3060 regulator input via diode-OR so that either supply can power the system. The ...

Circuit LTspice 

 

LTC3625 5V Power Ride Through

Jun 5th 2002
In the event of an interruption to the main power supply, the supercapacitors can power the system for up to several seconds. The diode or controller LTC4412 automatically switches the input of the LTM4616 to the supercapacitors if the 5V power is unavailable. The LTC3625/LTC3625-1 are programmable supercapacitor chargers designed ...

Circuit 

 

LTC3625 12V Power Ride Through Using Six 10F, 2.7V Supercapacitors in Series with Front End Flyback

Dec 5th 2000
Multiple LTC3625's can be stacked in series to store significantly more energy and extend hold up time in ride through or last gasp applications. In this circuit, the three outputs of the LT1737 flyback converter drive three LTC3625's, each of which charges a pair of 100F capacitors. In the event of an interruption to the main ...

Circuit 

 

5V at 6mA for 9.6s Supercapacitor Backup Supply

Aug 24th 1997
The LT1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V. A programmable input current limiting function allows precise control of peak switch current. Peak switch current can be set to any value between 30mA and 500mA by adjusting one resistor. ...

Circuit 

 

Low Power 5V Battery Backup Supply with Autoswitchover and No Reverse Current

Jul 1st 1997
The LTC1514 is a micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is fixed at either 3.3V or 5V by an internal resistor. An internal low-battery comparator is kept active in shutdown. ...

Circuit