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SC1175CSW 数据表(PDF) 4 Page - Semtech Corporation

部件名 SC1175CSW
功能描述  Low Power Dual Synchronous DC/DC Controller With Current Sharing Circuitry
PDF  20 Pages
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

SC1175CSW 数据表(HTML) 4 Page - Semtech Corporation

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ã 2000 Semtech Corp.
www.semtech.com
SC1175
POWER MANAGEMENT
EXPANDED PIN DESCRIPTION
Pin 1: (VREF)
Internal 1.25V reference
Connected to the + input of the master channel error
amplifier.
Pin 2: (+IN)
+ Input of slave channel error amplifier.
Connected to 1.25V reference (Pin 1) for the two
independent channel configuration.
Pin 3, 18: (-IN2, -IN1)
- Inputs of close loop error amplifiers.
Works as a feedback inputs (For both modes).
Pin 4: (VCC)
VCC chip supply voltage.
15V maximum, 10mA typical.
Needs a 1µF ceramic multilayer decoupling capaci-
tor to GND (Pin 20).
Pin 5, 6,15, 16: (CL2-, CL2+, CL1+, CL1-)
Pins (-) and (+) of the current limit amplifiers for both
channels.
Connected to output current sense resistors. Com-
pares that sense voltage to internal 75mV reference.
Needs RC filter for noise rejection.
Pin 7, 14: (BST2, BST1)
BST signal. Supply for high side driver.
Can be connected to a high enough voltage source.
Usually connected to bootstrap circuit.
Pin 8, 13: (DH2, DH1)
DH signal (Drive High).
Gate drive for top MOSFETs.
Requires a small series resistor.
Pin 9, 12: (DL2, DL1)
DL signal (Drive Low).
Gate drive for bottom MOSFETs.
Requires a small series resistor.
Pin 10: (PGND)
Power GND. Return of gate drive currents.
Pin 11: (BSTC)
Supply for bottom MOSFETs gate drive.
Pin 17: (SS/ENA)
Soft start pin. Internal current source connected to
external capacitor.
Inhibits the chip if pulled down.
Pin 19: (PWRGD)
Power good signal.
Open collector signal .
Turns to 0 if output voltage is outside the power good
window.
Pin 20: (GND)
Analog GND.
Return of analog signals and bias of chip.
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Notes:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices
Pin Configuration
Ordering Information
Pin Descriptions
Marking Information
TOP
yyww = Datecode (Example: 9908)
xxxx = Semtech Lot # (Example: 90101)



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