SC1409 Semtech Corporation, SC1409 Datasheet
SC1409
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SC1409 Summary of contents
Page 1
... DESCRIPTION The SC1409 is a versatile, voltage-mode switching regulator designed for use in battery operated power supply applications. A simple, fixed-voltage buck regu- lator can be implemented using the SC1409 with a minimum of external components. Internal MOSFETs and control circuitry minimize board space and design time. ...
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... 100mA to 1A LOAD O LINE FSET=Vin FSET=GND max I O Vin Increasing Vin decreasing Top side PFET DS(ON) Bottom side NFET 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 Maximum V -0 GND ± -0 - -40 to +125 J T -60 to +150 ...
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... FB Output voltage feedback. 5 PGND Device power ground. 6 PHASE Power output to the inductor. 7 VIN Input voltage. 8 ISET Current limit programming input. 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 VIN 1:800 ISET + - PHASE SHOOT THRU CONTROL 60nS DELAY PGND Pin Function , f = 500kHz IN 3 ...
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... EN/SS Voltage (V) Soft Start control of Vout © 2000 SEMTECH CORP Synchronous Switching Regulator 0.0% 180 Phase 135 -0. Gain -0.4% 0 -45 -90 -0.6% 100E+6 0.0 Load Regulation Characteristic 90% 80% 70% 60% 5.2 5.4 5.6 0.0 Efficiency 2.5 3.0 3.5 Ripple; Vo=3.3V; Io=1A; f=300kHz 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 0.2 0.4 0.6 0.8 Io (A) 25 mOhm 3.3V; f=300kHz 3.3V; f=500kHz 2.5V; f=300kHz 2.5V; f=500kHz 0.2 0.4 0.6 0.8 Io(A) 1.0 1.0 4 ...
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... UVLO trip point vs temperature 1.206 1.204 1.202 1.200 1.198 1.196 -50 75 100 125 Reference voltage vs temperature 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 Frequency (FSET Max Duty Cycle Frequency (FSET=GND 100 125 o Temperature ( C) V Increasing IN V Decreasing ...
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... If the soft-start pin is held low, the SC1409 will remain in low- power mode, drawing approximately 5uA from the sup- ply. Once the soft start pin is released, the external soft- ...
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... Normally, external compensation is not recommended, however, if required, loop response can be tailored with suitable values for R3, R5, C4 and C5. Consult the factory for details. 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 Place C6 across pins 7 and 5 of SC1409, as close as possible to package 3.3V Out C4 R2 OPEN 1.74k* ...
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... June 28, 2000 OUTLINE DRAWING LAND PATTERN SO-8 ECN00-1096 © 2000 SEMTECH CORP Synchronous Switching Regulator 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1409 JEDEC REF: MS-012AA 8 ...