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SC1176TSTRT Datasheet(PDF) 5 Page - Semtech Corporation |
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SC1176TSTRT Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 23 page 5 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC1176/SC1176A Pin Configuration EXPANDED PIN DESCRIPTION Pin 1: (VREF) Internal .9V reference Connected to the + input of the master channel error amplifier. Pin 2: (+IN2) + Input of slave channel error amplifier. Connected to .9V reference (Pin 1) for 2 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, 15mA typical. Needs a 1µF ceramic multilayer decoupling capacitor 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 serie resistor. Pin 9, 12: (DL2, DL1) DL signal (Drive Low). Gate drive for bottom MOSFETs. Requires a small serie 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 he 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. e c i v e D ) 1 ( e g a k c a P ) 2 ( R T W S C 6 7 1 1 C S 0 2 - C I O S T R T W S C 6 7 1 1 C S R T W S A 6 7 1 1 C S T R T W S A 6 7 1 1 C S R T S T 6 7 1 1 C S 0 2 - P O S S T T R T S T 6 7 1 1 C S R T S T A 6 7 1 1 C S 1 - B V E 6 7 1 1 C Sn o it a u l a v E n o i s r e V e r a h S t n e r r u C d r a o B 2 - B V E 2 - 6 7 1 1 C Sn o it a u l a v E n o i s r e V l e n n a h C l a u D Notes: (1) Only available in tape and reel packaging. A reel contains 1000 (SOIC) or 2500 (TSSOP) devices. (2) Lead free product. This product is fully WEEE and RoHS compliant. Pin Descriptions Top View (SOIC-20 and TSSOP-20 Pin) Ordering Information |
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