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LTC3828

Features: ` Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise` Tracking for Both Outputs` Constant Frequency Current Mode Control` Wide VIN Range: 4.5V to 28V Operation`Power Good Output Voltage Indicator`Adjustable Soft-Start Current Ramping` Foldback ...

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SeekIC No. : 004402375 Detail

LTC3828: Features: ` Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise` Tracking for Both Outputs` Constant Frequency Current Mode Control` Wide VIN Range: 4.5V t...

LTC3828 Data Sheet

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Part Number:
LTC3828
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
` Tracking for Both Outputs
` Constant Frequency Current Mode Control
` Wide VIN Range: 4.5V to 28V Operation
`Power Good Output Voltage Indicator
`Adjustable Soft-Start Current Ramping
` Foldback Output Current Limiting Disabled at Start-Up
` No Reverse Current During Soft-Start Interval
` Clock Output for 3-, 4-, 6-Phase Operation
` Dual N-Channel MOSFET Synchronous Drive
` ±1% Output Voltage Accuracy
` Phase-Lockable Fixed Frequency 260kHz to 550kHz
` OPTI-LOOP® Compensation Minimizes COUT
` Very Low Dropout Operation: 99% Duty Cycle
` Output Overvoltage Protection
` Small 28-Lead SSOP and 5mm * 5mm QFN Packages


Application

· Telecom Infrastructure
· ASIC Power Supply
· Industry Equipment


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, DRVCC, RUN1, RUN2, (BOOST1-SW1),
(BOOST2-SW2) ............................................ 7V to 0.3V
SENSE1+, SENSE2 +, SENSE1,
SENSE2 Voltages ........................ (1.1)INTVCC to 0.3V
FCB/PLLIN, PLLFLTR, CLKOUT,
PHSMD Voltage ..................................... INTVCC to 0.3V
TRCKSS1, TRCKSS2 ................................ INTVCC to 0.3V
    PGOOD ................................................... 5.5V 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 ................................... 50mA
Operating Temperature Range (Note 7)
    LTC3828E ............................................... 40 to 85
Junction Temperature (Note 2) ................................ 125
Storage Temperature Range ................... 65 to 125
Reflow Peak Body Temperature (UH Package) ......... 260
Lead Temperature (Soldering, 10 sec)
    (GN Package) ........................................................ 300


Description

The LTC®3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phaselockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked.

OPTI-LOOP compensation of LTC3828 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 a wide 4.5V to 28V (30V maximum) input supply range, encompassing all battery chemistries.

The RUN pins of LTC3828 control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode® operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during shortcircuit conditions. Reverse current and current foldback functions are disabled during soft-start.




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