SC2446AEVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC2446AEVB Datasheet PDF : 27 Pages
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SC2446A
POWER MANAGEMENT
Pin Descriptions
TSSOP Package
Pin
Pin Name Pin Function
1
CS1+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Controller 1.
2
CS1-
The Inverting Input of the Current-sense Amplifier/Comparator for the Controller 1. Normally
tied to the output of the converter.
3
ROSC
An external resistor connected from this pin to GND sets the oscillator frequency.
4
IN1-
Inverting Input of the Error Amplifier for the Step-down Controller 1. Tie an external resistive
divider between OUTPUT1 and the ground for output voltage sensing.
5
COMP1 The Error Amplifier Output for Step-down Controller 1. This pin is used for loop compensation.
Edge-triggered Synchronization Input. When not synchronized, tie this pin to a voltage above
6
SYNC
1.5V or the ground. An external clock (frequency > frequency set with ROSC) at this pin
synchronizes the controllers.
7
AGND
Analog Signal Ground.
8
REF
The non-inverting input of the error amplifier for the step down converter 1.
9
REFOUT Buffered output of the internal reference voltage 0.5V.
10
REFIN
An external Reference voltage is applied to this pin.The non-inverting input of the error
amplifier for the step-down converter 2 is internally connected to this pin.
11
COMP2 The Error Amplifier Output for Step-down Controller 2. This pin is used for loop compensation.
Inverting Input of the Error Amplifier for the Step-down Controller 2. Tie an external resistive
12
IN2-
divider between output2 and the ground for output voltage sensing. Tie to AVCC for two-phase
single output applications
13
CS2-
The Inverting Input of the Current-sense Amplifier/Comparator for the Controller 2. Normally
tied to the output of the converter.
14
CS2+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Controller 2
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time
15
SS2/EN2 for step-down converter 2. Pulling this pin below 0.7V shuts off the gate drivers for the second
controller. Leave open for two-phase single output applications.
16
AVCC
Power Supply Voltage for the Analog Portion of the Controllers.
17
VIN2
No connection.
18
VPN2
No connection.
19
BST2
No connection.
20
GDH2
PWM Output for the High-side N-channel MOSFET of Output 2.
2005 Semtech Corp.
6
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