SC2446EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC2446EVB' PDF : 38 Pages View PDF
SC2446
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
Buffered Output of the Internal 0.5V Reference. The non-inverting input of the error amplifier
for the step-down converter 1 is internally connected to this pin .
9
REFOUT
Buffered output of the external voltage applied to Pin 10.
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
15
SS2/EN2 time 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
This pin is tied to the voltage supplying the drain of the high side power MOSFET of converter
2. This pin is used only in "Combi" current sense.
The Second Step-down Converter Virtual Phase Node (Unloaded). Used for "Combi" current
18
VPN2
sense only. This pin is left open when sensing current with a sense resistor at the converter
output.
19
BST2
Bootstrapped Supply for the High-side Gate Drive 2. Connect to a bootstrap capacitor and an
external diode as described in application information.
20
GDH2
Gate Drive Output for the High-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to VBST2.
2004 Semtech Corp.
6
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