LINEAR TECHNOLOGY - 1 LTC3736 Data Sheet Manual
Summary
The LTC3736 is a high-efficiency, dual 2-phase synchronous DC/DC step-down controller for demanding portable and battery-powered applications. This revolutionary circuit eliminates the need for external current sense resistors, simplifying design while maximizing performance. The manual details its advanced features, including out-of-phase control for ultra-low dropout operation, wide voltage range (2.75V to 9.8V), constant frequency mode, and adjustable burst mode capability. Ideal for building compact notebooks, PDAs, and portable instruments that require reliable, regulated power delivery.
Page 1 Text Content
LTC3736 TM,
Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking
FEATURES DESCRIPTIO No Current Sense Resistors Required The LTC®3736 is a 2-phase dual synchronous step-down Out-of-Phase Controllers Reduce Required switching regulator controller with tracking that drives Input Capacitance external complementary power MOSFETs using few exter- Tracking Function nal components. The constant frequency current mode Wide VIN Range: 2.75V to 9.8V architecture with MOSFET VDS sensing eliminates the Constant Frequency Current Mode Operation need for sense resistors and improves efficiency. Power 0.6V ±1.5% Voltage Reference loss and noise due to the ESR of the input capacitance are Low Dropout Operation: 100% Duty Cycle minimized by operating the two controllers out of phase. True PLL for Frequency Locking or Adjustment
Burst Mode operation provides high efficiency at light loads.
Selectable Burst Mode®/Forced Continuous Operation
100% duty cycle capability provides low dropout operation,
Auxiliary Winding Regulation
extending operating time in battery-powered systems.
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor The switching frequency can be programmed up to 750k Hz, Output Overvoltage Protection allowing the use of small surface mount inductors and ca- Micropower Shutdown: IQ = 9µA pacitors. For noise sensitive applications, the LTC3736 Tiny Low Profile (4mm × 4mm) QFN and Narrow switching frequency can be externally synchronized from
SSOP Packages EF FI CI EN CY 250k Hz to 850k Hz. Burst Mode operation is inhibited dur-
ing synchronization or when the SYNC/FCB pin is pulled low APPLICATIO S in order to reduce noise and RF interference. Automatic soft- start is internally controlled.
One or Two Lithium-Ion Powered Devices
The LTC3736 is available in the tiny thermally enhanced
Notebook and Palmtop Computers, PDAs
(4mm × 4mm) QFN package or 24-lead SSOP narrow
Portable Instruments
package.
Distributed DC Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066, 6611131, 6498466.
TYPICAL APPLICATIO High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter Efficiency vs Load Current
VIN 2.75V TO 9.8V 10µF
VIN VIN = 3.3V
SENSE1+ SENSE2+
VIN = 4.2V
TG1 TG2
2.2µH SW1 SW2 2.2µH
VIN = 5V
LTC3736 BG1 BG2
PGND PGND
VOUT1 VOUT2
VFB1 VFB2
ITH1 ITH2 FIGURE 16 CIRCUIT 220p F SGND 220p F VOUT = 2.5V
LOAD CURRENT (m A)
3736 TA01b
3736 TA01a
3736fa
Page Summary Contents For LINEAR TECHNOLOGY - 1 LTC3736 Data Sheet Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 432.20 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the input voltage range for this device?
The LTC3736 operates on a wide V Range: 2.75V to 9.8V.
Can I program the switching frequency on the LTC3736?
Yes, the switching frequency can be programmed up to 750kHz and externally synchronized from 250kHz to 850kHz.
How does Burst Mode operation work in this device?
Burst Mode provides high efficiency at light loads and is also used for low dropout operation due to selectable burst or forced continuous modes.
What kind of packages are available for the LTC3736?
It is available in 4mm x 4mm QFN, 24-lead SSOP narrow, and a tiny thermally enhanced package for portable instruments.