SC2440 SEMTECH [Semtech Corporation], SC2440 Datasheet - Page 4

• Manufacturer Part Number: SC2440
• Description: 2.5 MHz Dual Switching Regulator with Integrated 2A Switches
• Manufacturer: SEMTECH [Semtech Corporation]

POWER MANAGEMENT
Pin Configuration
Pin Descriptions
2005 Semtech Corp.
Underside
10, 15
12, 13
11, 14
Pin #
Metal
9, 16
1, 8
2, 7
3, 6
4
5
Underside metal must be soldered to ground.
BOOST1
BOOST2
ROSC
SYNC
SW1
SW2
IN
IN
SW1, SW2
Pin Name
PGOOD1,
SS1, SS2
FB1, FB2
PGOOD2
BOOST1,
BOOST2
(16 Pin TSSOP-EDP)
COMP1,
COMP2
ROSC
SYNC
GND
IN
TOP VIEW
1
2
3
4
5
6
7
8
16
15
14
13
12
10
11
Supply pins to the power transistor drivers.Tie to external diode-capacitor charge pumps to
generate drive voltages higher than V
Emitters of the internal power NPN transistors. Connect to the inductors, the freewheeling diodes
and the boost capacitors.
Input power supply pins of the SC2440 and also the common collector of the internal power
NPNs. Pins 3 and 6 are internally tied together and must be locally bypassed.
Driving the SYNC pin with an external clock synchronizes both step-down converters. The
external clock frequency must be at least twice the individual regulator set (or free-running)
An external resistor between this pin and the ground sets the master oscillator free-running
output and the ground for setting the channel output voltage.
switch currents. RC networks at these pins compensate the control loops. Pulling either pin below
0.7V stops the corresponding switching regulator.
Open collector outputs of the Power Good comparators. Tie to external pull-up resistors from the
input or the output of the converter. The PGOOD outputs become valid as soon as V
above 1 V
A capacitor from either SS pin to the ground provides soft-start and overload hiccup functions
off the corresponding regulator. To completely shut off the SC2440 to low-current state, pull both
SS pins to the ground. Soft-start is recommended for all applications.
SC2440. It also provides a thermal contact to the circuit board. It is to be soldered to the ground
plane of the board.
frequency. Tie this pin to ground if not used.
frequency. The set frequency is twice that of the individual switching regulator.
The inverting inputs of the error amplifiers. Each FB pin is tied to a resistive divider between its
These are the outputs of the internal error amplifiers. The voltages on these pins control the peak
to within 10% of the final regulation voltage.
for that channel. Pulling either SS pin below 0.8V with an open drain or collector transistor shuts
The exposed pad at the bottom of the package is the electrical ground connection of the
9
SS1
SS2
FB1
PGOOD1
PGOOD2
FB2
COMP1
COMP2
BE
during power-up. PGOOD is actively pulled low until the corresponding FB pin rises
4
Notes:
(1) Only available in tape and reel packaging. A reel contains
2500 devices.
(2) Lead free product. This product is fully WEEE and RoHS
Ordering Information
compliant.
IN
in order to fully saturate the internal NPN power switches.
SC2440TETRT
Pin Function
Part Number
SC2440EVB
Evaluation Board
TSSOP-16 EDP
Package
www.semtech.com
SC2440
(1)(2)
IN
rises