SC2441EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC2441EVB
Semtech Corporation
'SC2441EVB' PDF : 35 Pages View PDF
SC2441
POWER MANAGEMENT
Pin Descriptions
Pin
Pin Name Pin Function
1
IN
Power Supply Voltage for the Analog Section of the Boost Converter.
The Virtual Phase (Unloaded) Node of the Second Step-down Converter. Used for "Combi"
2
VPN2
current sense only. This pin is left open when sensing current with a sense resistor at the
converter output.
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time
3
SS1/EN1 for step-down converter 1. Pulling this pin below 0.5V shuts off the gate drivers for the first
controller.
4
CS1+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Step-down
Controller 1.
5
CS1-
The Inverting Input of the Current-sense Amplifier/Comparator for the Step-down Controller 1.
Normally tied to the output of the converter.
Synchronization and Shutdown Input. For normal operation, tie this pin to a voltage above
1.5V. To shut-off both step-down controllers and the boost regulator, force this pin to a voltage
6
SYNC/SHDN
less than 0.5V. The master oscillator can be synchronized by driving this pin with an external
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7
FB3
The Inverting Input of the Error Amplifier for the Boost Converter. FB3 is tied to an external
resistive divider for output3 voltage setting.
8
COMP3
The Error Amplifier Output of the Boost Converter. This pin is used for loop compensation.
Pulling this pin below 0.4V disables the step-up converter.
9
GND
Analog Signal Ground.
10
ROSC
An external resistor connected from this pin to GND sets the oscillator frequency.
11
FB1
The Inverting Input of the Error Amplifier for the Step-down Controller 1. Tie to an external
resistive divider between OUTPUT1 and the ground for output voltage sensing.
12
COMP1
The Error Amplifier Output for Step-down Controller 1. This pin is used for loop compensation.
13
COMP2
The Error Amplifier Output for Step-down Controller 2. This pin is used for loop compensation.
The Inverting Input of the Error Amplifier for the Step-down Controller 2. Tie to an external
14
FB2
resistive divider between output2 and the ground for output voltage sensing. Tie to IN or VCC
for two-phase single output applications
15
CS2-
The Inverting Input of the Current-sense Amplifier/Comparator for the Step-down Controller 2.
Normally tied to the output of the converter.
16
CS2+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Step-down
Controller 2
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time
17
SS2/EN2
for step-down converter 2. Pulling this pin below 0.5V shuts off the gate drivers for the second
controller. Leave open for two-phase single output applications.
18
BST2
Bootstrapped Supply for the High-side Gate Drive 2. Connect to a bootstrap capacitor and an
external diode as described in application information.
19
GDH2
Gate Drive Output for the High-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to VBST2.
20
GDL2
Gate Drive Output for the Low-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to VCC.
2005 Semtech Corp.
6
www.semtech.com
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