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LTC3736-2

Features: No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance Tracking Function Wide VIN Range: 2.75V to 9.8V 0.6V ±1% Voltage Reference High Current Limit Constant Frequency Current Mode Operation Low Dropout Operation: 100% Duty Cycle True PLL for Freq...

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LTC3736-2: Features: No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance Tracking Function Wide VIN Range: 2.75V to 9.8V 0.6V ±1% Voltage Reference High Current Limi...

LTC3736-2 Data Sheet

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Part Number:
LTC3736-2
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input Capacitance
Tracking Function
Wide VIN Range: 2.75V to 9.8V
0.6V ±1% Voltage Reference
High Current Limit
Constant Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Low Profile (4mm * 4mm) QFN Package


Application

One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) ....................... 0.3V to 10V
PLLLPF, RUN/SS, SYNC/FCB,
TRACK, SENSE1+, SENSE2+,
IPRG1, IPRG2 Voltages ................. 0.3V to (VIN + 0.3V)
VFB1, VFB2, ITH1, ITH2 Voltages .............  0.3V to 2.4V
SW1, SW2 Voltages ............ 2V to VIN + 1V or 10V Max
PGOOD .....................................................   0.3V to 10V
TG1, TG2, BG1, BG2 Peak Output Current (<10µs) .....  1A
Operating Temperature Range (Note 2) 40°C to 85°C
Storage Temperature Range .............. 65°C to 125°C
Junction Temperature (Note 3) ............................ 125°C


Description

The LTC®3736-2 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary 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. 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 of LTC3736-2 provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.

The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz. An internal soft-start, which can be lengthened externally, smoothly ramps the output voltage during start-up.

The LTC3736-2 is available in the tiny thermally enhanced (4mm × 4mm) QFN package.




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