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SC2677B Datasheet(PDF) 5 Page - Semtech Corporation

Part # SC2677B
Description  Dual Synchronous Voltage Mode Controller with Current Sharing Circuitry
PDF  19 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2677B Datasheet(HTML) 5 Page - Semtech Corporation

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© 2004 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2677B
EXP
EXP
EXP
EXP
EXPANDED PIN DESCRIPTION
ANDED PIN DESCRIPTION
ANDED PIN DESCRIPTION
ANDED PIN DESCRIPTION
ANDED PIN DESCRIPTION
Pin 1
Pin 1
Pin 1
Pin 1
Pin 1, 2
, 2
, 2
, 2
, 24:
4:
4:
4:
4: (CS2+, CS1+)
Current sense amplifier (for OCP protection) non-inverting
inputs.
Pin 2, 23:
Pin 2, 23:
Pin 2, 23:
Pin 2, 23:
Pin 2, 23: (CS2-, CS1-)
Current-Sense Amplifier (for OCP protection) inverting
inputs.
Pin 3:
Pin 3:
Pin 3:
Pin 3:
Pin 3: (VREF)
Internal 0.5V reference. Connected to the “+” input of
the Master Channel Error Amplifier.
Pin 4:
Pin 4:
Pin 4:
Pin 4:
Pin 4: (FREQ)
External frequency adjustment. Connect a resistor to
AGND to set the switching frequency. Please see more
information in “Application” section.
Pin 5:
Pin 5:
Pin 5:
Pin 5:
Pin 5: (VCC)
Bias pin for the controller. Connect a ceramic decoupling
capacitor from this pin to AGND with minimum trace
length.
Pin 6:
Pin 6:
Pin 6:
Pin 6:
Pin 6: (+IN2)
“+” input of the slave error amplifier.
Pin 7, 18:
Pin 7, 18:
Pin 7, 18:
Pin 7, 18:
Pin 7, 18: (-IN2, -IN1)
“-” inputs of the Error Amplifiers.
Pin 8, 1
Pin 8, 1
Pin 8, 1
Pin 8, 1
Pin 8, 17
77
7
7::::: (COMP2, COMP1)
Compensation pins of the Error Amplifiers.
Pin 9, 1
Pin 9, 1
Pin 9, 1
Pin 9, 1
Pin 9, 16:
6:
6:
6:
6: (BST2, BST1)
Supply pins for the high side drivers. Usually connected
to bootstrap circuit.
Pin 10, 15:
Pin 10, 15:
Pin 10, 15:
Pin 10, 15:
Pin 10, 15: (DH2, DH1)
Gate drive pins for the top MOSFETs. Requires a small
series resistor.
Pin 11, 14:
Pin 11, 14:
Pin 11, 14:
Pin 11, 14:
Pin 11, 14: (DL2, DL1)
Gate drive pins for the bottom MOSFETs. Requires a small
series resistor.
Pin 12:
Pin 12:
Pin 12:
Pin 12:
Pin 12: (PGND)
Power GND. Return of the high side and low side gate
drivers.
Pin 13:
Pin 13:
Pin 13:
Pin 13:
Pin 13: (BSTC)
Supply pin for bottom MOSFET gate drivers.
Pin 19:
Pin 19:
Pin 19:
Pin 19:
Pin 19: (PHASING)
This pin controls the phase shift between Master and
Slave for optimum noise immunity. Use a resistive di-
vider 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 20:
Pin 20:
Pin 20:
Pin 20:
Pin 20: (SS/ENA)
Soft Start pin. Connect a ceramic capacitor from this pin
to AGND, and there is an internal current source charg-
ing up this capacitor during Soft Start. The PWM opera-
tion can be disabled if this pin is pulled low.
Pin 2
Pin 2
Pin 2
Pin 2
Pin 21:
1:
1:
1:
1: (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 22:
Pin 22:
Pin 22:
Pin 22:
Pin 22: (GND)
Analog GND. Return of the analog signals and bias of
the chip.
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Notes:
Notes:
Notes:
Notes:
Notes:
(1) Only available in tape and reel packaging. A reel con-
tains 2500 devices.
(2) Lead free package. Device is fully WEEE and RoHS
compliant.
Top View
(TSSOP-24 Pin)
Pin Configuration
Ordering Information
Pin Descriptions



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