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LTC1628-SYNC

Features: ·Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise·OPTI-LOOPTM Compensation Minimizes COUT·Dual N-Channel MOSFET Synchronous Drive·±1% Output Voltage Accuracy·Power Good Output Voltage Monitor·Phase-Lockable Fixed Frequency 150kHz to 300kHz·Wide VI...

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SeekIC No. : 004401747 Detail

LTC1628-SYNC: Features: ·Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise·OPTI-LOOPTM Compensation Minimizes COUT·Dual N-Channel MOSFET Synchronous Drive·±1% Output Voltag...

LTC1628-SYNC Data Sheet

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Part Number:
LTC1628-SYNC
Supply Ability:
5000

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Product Details

Description



Features:

·Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
·OPTI-LOOPTM Compensation Minimizes COUT
·Dual N-Channel MOSFET Synchronous Drive
·±1% Output Voltage Accuracy
·Power Good Output Voltage Monitor
·Phase-Lockable Fixed Frequency 150kHz to 300kHz
·Wide VIN Range: 3.5V to 36V 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
·Remote Output Voltage Sense
·Low Shutdown IQ: 20mA
·5V and 3.3V Standby Regulators
·Small 28-Lead SSOP Package
·Selectable Constant Frequency or Burst ModeTM Operation


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN)...........................................................................36V to 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) .......................................................................................42V to 0.3V
Switch Voltage (SW1, SW2) .............................................................................36V 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 <10ms (TG1, TG2, BG1, BG2) ......................................................... 3A
INTVCC Peak Output Current ...................................................................................... 50mA
Operating Temperature Range
LTC1628CG-SYNC................................................................................................. 0 to 85
LTC1628IG-SYNC ........................................................................... ................ 40 to 85
Junction Temperature (Note 2) .................................................................................... 125
Storage Temperature Range ......................................................................... 65 to 150
Lead Temperature (Soldering, 10 sec)........................................................................... 300


Description

The LTC®1628-SYNC is a high performance dual stepdown switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phaselockable frequency of up to 300kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase.

OPTI-LOOP compensation of LTC1628-SYNC allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 3.5V to 30V (36V 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 a secondary winding. The LTC1628-SYNC includes a power good output pin that indicates when both outputs are within 7.5% of their designed set point.




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