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LTC3736-1

Features: Spread Spectrum Operation Tracking Function No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance Wide VIN Range: 2.75V to 9.8V Current Mode Operation 0.6V ±1.5% Voltage Reference Low Dropout Operation: 100% Duty Cycle Pulse Skipping Operation at...

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LTC3736-1: Features: Spread Spectrum Operation Tracking Function No Current Sense Resistors Required Out-of-Phase Controllers Reduce Required Input Capacitance Wide VIN Range: 2.75V to 9.8V Current Mode Opera...

LTC3736-1 Data Sheet

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Part Number:
LTC3736-1
Supply Ability:
5000

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

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Product Details

Description



Features:

Spread Spectrum Operation
Tracking Function
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input Capacitance
Wide VIN Range: 2.75V to 9.8V
Current Mode Operation
0.6V ±1.5% Voltage Reference
Low Dropout Operation: 100% Duty Cycle
Pulse Skipping Operation at Light Loads
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Low Profile (4mm * 4mm) QFN and Narrow SSOP Packages


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
FREQ, RUN/SS, SSDIS,
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
Lead Temperature (Soldering, 10 sec)
(LTC3736EGN-1) ...................................................... 300°C


Description

The LTC®3736-1 is a 2-phase dual synchronous stepdown 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.

A unique spread spectrum architecture randomly varies the LTC3736-1's switching frequency from 450kHz to 580kHz, significantly reducing the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

Pulse skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. The high switching frequencies allow for the use of small surface mount inductors and capacitors.

The LTC3736-1 is available in the low profile (0.75mm) 24-pin thermally enhanced (4mm * 4mm) QFN package and 24-lead narrow SSOP packages.




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