LTC3737 - Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
Features
- Sense Resistor Optional
- Out-of-Phase Controllers Reduce Required Input Capacitance
- Programmable Output Voltage Tracking
- Constant Frequency Current Mode Architecture
- Wide VIN Range: 2.75V to 9.8V
- Wide VOUT Range: 0.6V to VIN
- 0.6V ±1.5% Reference
- Low Dropout Operation: 100% Duty Cycle
- True PLL for Frequency Locking or Adjustment (Frequency Range 250kHz to 850kHz)
- Selectable Burst Mode® or Pulse Skipping Operation at Light Loads
- Internal Soft-Start Circuitry
- Selectable Maximum Peak Current Sense Threshold
- Power Good Output Voltage Monitor
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 9µA
- Tiny 4mm × 4mm QFN and 24-Lead SSOP Packages
Typical Application
Description
The LTC3737 is a 2-phase dual step-down switching regulator controller that requires few external components. The constant frequency current mode architecture provides excellent AC and DC load and line regulation. MOSFET VDS sensing eliminates the need for current sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase.
Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation and extends battery operating time.
Switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3737 can be externally synchronized from 250kHz to 850kHz.
Other features include a power good output voltage monitor, a tracking input and internal soft-start.
The LTC3737 is available in the low profile thermally enhanced (4mm × 4mm) QFN package or a 24-lead SSOP narrow package.
Protected by U.S. Patents, including 5481178, 5731694, 5929620, 6144194, 6580258, 5994885
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 |
|---|---|---|---|---|---|
| LTC3737EGN#PBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3737EGN#TRPBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3737EUF#PBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3737EUF#TRPBF | 4x4 QFN-24 | UF | E | 05-08-1697 | 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 | |
|---|---|---|---|---|---|---|
| LTC3737EGN#PBF | SSOP-24 | E | $5.27 | $3.65 | Yes | |
| LTC3737EGN#TRPBF | SSOP-24 | E | $3.75 | Yes | ||
| LTC3737EUF#PBF | 4x4 QFN-24 | E | $5.27 | $3.65 | Yes | |
| LTC3737EUF#TRPBF | 4x4 QFN-24 | E | $3.75 | 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 |
|---|---|---|---|
| DC664A | LTC3737EUF | 2-Phase Dual Step-Down DC/DC Converter, Vin = 2.75V - 9.8V, Vout1 = 2.5V at 2.5A, Vout2 = 1.8V at 3A | $125.00 | |
| Buy Now | |||
Applications
- One or Two Lithium-Ion Powered Devices
- Notebook and Palmtop Computers, PDAs
- Portable Instruments
- Distributed DC Power Systems
People Who Viewed This Product Also Viewed
- LTM8027 - 60V, 4A DC/DC μModule (Power Module) Regulator
- LT3724 - High Voltage, Current Mode Switching Regulator Controller
- LT8614 - 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- LTC3736 - Dual 2-Phase, No RSENSE, Synchronous Controller with Output Tracking
- LTC3891 - Low IQ, 60V Synchronous Step-Down Controller
- LTC3808 - No RSENSE, Low EMI, Synchronous DC/DC Controller with Output Tracking
- LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LT3742 - Dual, 2-Phase Step-Down Switching Controller
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
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
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.
