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SC2677EVB-1 Datasheet(PDF) 4 Page - Semtech Corporation |
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SC2677EVB-1 Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 9 page 4 © 2004 Semtech Corp. www.semtech.com POWER MANAGEMENT SC2677 Pin Configuration Ordering Information EXPANDED PIN DESCRIPTION Pin 1: (VREF) Internal 0.5V reference. Connected to the + input of the master channel error amplifier. Pin 2: (FREQ) External frequency adjustment. Connect a resistor to AGND to set the switching frequency. Please see more information in Application section. Pin 3: (VCC) Bias pin for the controller. Connect a ceramic decoupling capacitor from this pin to AGND with minimum trace length. Pin 4: (+IN2) “+” input of the slave error amplifier. Pin 5, 16: (-IN2, -IN1) “-” inputs of the error amplifiers. Pin 6, 15: (COMP2, COMP1) Compensation pins of the error amplifiers. Pin 7, 14: (BST2, BST1) Supply pins for the high side drivers. Usually con- nected to bootstrap circuit. Pin 8, 13: (DH2, DH1) Gate drive pins for the top MOSFETs. Requires a small series resistor. Pin 9, 12: (DL2, DL1) Gate drive pins for the bottom MOSFETs. Requires a small series resistor. Pin 10: (PGND) Power GND. Return of the high side and low side gate drivers. Pin 11: (BSTC) Supply pin for bottom MOSFET gate drivers. Pin 17: (PHASING) This pin controls the phase shift between master and slave for optimum noise immunity. Use a resistive divider from the FREQ pin (pin 2) to AGND, and connect the tap of the resistive divider to pin 17. Please see more information in Application section. Pin 18: (SS/ENA) Soft start pin. Connect a ceramic capacitor from this pin to AGND, and there is an internal current source charging up this capacitor during soft start. The PWM operation can be disabled if this pin is pulled low. Pin 19: (PWRGD) Power good signal. This is an open collector output. It is pulled low internally if output voltage is outside the power good window. Pin 20: (GND) Analog GND. Return of the analog signals and bias of the chip. e c i v e D ) 1 ( e g a k c a P R T S T 7 7 6 2 C S0 2 - P O S S T T R T S T 7 7 6 2 C S ) 2 ( 0 2 - P O S S T 1 - B V E 7 7 6 2 C Sd r a o B n o i t a u l a v E e r a h S t n e r r u C 2 - B V E 7 7 6 2 C Sd r a o B n o i t a u l a v E l e n n a h C l a u D Notes: (1) Only available in tape and reel packaging. A reel con- tains 2500 devices. Pin Descriptions Top View (TSSOP-20 Pin) (2) Lead free package. |
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