LTC3836 - Dual 2-Phase, No RSENSE Low VIN Synchronous Controller
Features
- No Current Sense Resistors Required
- Out-of-Phase Controllers Reduce Required Input Capacitance
- All N-Channel Synchronous Drive
- VIN Range: 2.75V to 4.5V
- Constant-Frequency Current Mode Operation
- 0.6V ±1.5% Voltage Reference
- Low Dropout Operation: 97% Duty Cycle
- True PLL for Frequency Locking or Adjustment
- Selectable Pulse-Skipping/Continuous Operation
- Tracking Function
- Internal Soft-Start Circuitry
- Power Good Output Voltage Monitor
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 6.5µA
- Tiny Low Profile (4mm × 5mm) QFN and Narrow SSOP Packages
Typical Application
Description
The LTC3836 is a 2-phase dual output synchronous step-down switching regulator controller with tracking that drives external N-channel power MOSFETs using few external components. The constant-frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. The power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out-of-phase. Pulse-skipping operation provides high efficiency at light loads. The 97% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.The operating frequency is selectable from 300kHz to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3836 operating frequency can be externally synchronized from 250kHz to 850kHz.
The LTC3836 features an internal 1ms soft-start that can be extended with an external capacitor. A tracking input allows the second output to track the first during start-up.
The LTC3836 is available in the tiny thermally enhanced (4mm × 5mm) QFN and 28-lead narrow SSOP packages.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3836EGN#PBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3836EGN#TRPBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3836EUFD#PBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LTC3836EUFD#TRPBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3836EGN#PBF | SSOP-28 | E | $4.24 | $2.75 | Yes | |
| LTC3836EGN#TRPBF | SSOP-28 | E | $2.80 | Yes | ||
| LTC3836EUFD#PBF | 4x5 QFN-28 | E | $4.24 | $2.75 | Yes | |
| LTC3836EUFD#TRPBF | 4x5 QFN-28 | E | $2.80 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1081A | LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 12A, VOUT2 = 1.2V @ 12A | Contact Factory | |
| DC1107A | LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 7A, VOUT2 = 1.2V @ 7A | Contact Factory | |
| Buy Now | |||
Applications
- General Purpose 3.3V to 1.X Supplies
- Single Lithium-Ion Powered Devices
- Distributed DC Power Systems
People Who Viewed This Product Also Viewed
- LTC3860 - Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing
- LTC3861 - Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
- LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
- LTC4366 - High Voltage Surge Stopper
- LTC3855 - Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense
- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LT4363 - High Voltage Surge Stopper with Current Limit
- LTC3883/LTC3883-1- Single Phase Step-Down DC/DC Controller with Digital Power System Management
- LTC4364 - Surge Stopper with Ideal Diode
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3836
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
