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LTC3728L

Features: Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise OPTI-LOOP® Compensation Minimizes COUT ±1% Output Voltage Accuracy (LTC3728LC) Power Good Output Voltage Indicator Phase-Lockable Fixed Frequency 250kHz to 550kHz Dual N-Channel MOSFET Syn...

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SeekIC No. : 004402326 Detail

LTC3728L: Features: Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise OPTI-LOOP® Compensation Minimizes COUT ±1% Output Voltage Accuracy (LTC3728LC) Power Goo...

LTC3728L Data Sheet

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Part Number:
LTC3728L
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes COUT
±1% Output Voltage Accuracy (LTC3728LC)
Power Good Output Voltage Indicator
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Dual N-Channel MOSFET Synchronous Drive
Wide VIN Range: 4.5V to 28V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
Output Overvoltage Protection
Low Shutdown IQ: 20µA
5V and 3.3V Standby Regulators
3 Selectable Operating Modes: Constant Frequency,Burst Mode® Operation and PWM
5mm * 5mm QFN and 28-Lead Narrow SSOP Packages


Application

Notebook and Palmtop Computers
Telecom Systems
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) ............................. 30V to 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ........................................ 36V to 0.3V
Switch Voltage (SW1, SW2) ............................. 30V to 5V
INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1),
(BOOST2-SW2), PGOOD ..................................... 7V to 0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2 Voltages ............................. (1.1)INTVCC to 0.3V
PLLIN, PLLFLTR, FCB, Voltage ..................... INTVCC to 0.3V
ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages .........2.7V to 0.3V
Peak Output Current <10µs (TG1, TG2, BG1, BG2) ........... 3A
INTVCC Peak Output Current ....................................... 40mA
Operating Temperature Range (Note 7)
LTC3728LC/LTC3728LXC ................................. 0°C to 85°C
LTC3728LE ................................................. 40°C to 85°C
Junction Temperature (Note 2) .................................. 125°C
Storage Temperature Range ................... 65°C to 125°C
Reflow Peak Body Temperature (UH Package) ........... 260°C
Lead Temperature (Soldering, 10 sec)
(GN Package) ............................................................. 300°C


Description

The LTC® 3728L/LTC3728LX are dual high performance step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A con-stant frequency current mode architecture allows phase-lockable frequency of up to 550kHz. Power loss and noisedue to the ESR of the input capacitors are minimized byoperating the two controller output stages out of phase.

OPTI-LOOP compensation of LTC3728L/LTC3728LX  allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8Vreference and power good output indicator are compatible with future microproces-sor generations, and a wide 4.5V to 28V (30V maximum) input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate asecondary winding. The LTC3728L/LTC3728LX include a power good output pin that indicates when both outputs are within 7.5% of their designed set point.




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