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SC2544 Datasheet

  • SC2544

  • High Performance Wide Input Range Dual Synchronous Buck Cont...

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  • SEMTECH   SEMTECH

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High Performance Wide Input Range
Dual Synchronous Buck Controller
POWER MANAGEMENT
Description
The SC2544 is a high performance dual PWM controller.
It is designed to convert a wide ranged input voltage down
to two independent output rails. The PWM operations of
the two channels are 180 degree out of phase which
can greatly reduce the size and the cost of the input
capacitors. Synchronous Buck PWM topology and volt-
age mode control allow high efficiency operation, fast
transient responses, and flexible component selection
for easy designs. A 10V internal linear regulator pro-
vides the bias for the controller, and this voltage is opti-
mized for gate drivers to deliver high efficiency. The power
sequencing is fully supported including independent start
up, and power good output. In the shut down mode the
controller only draws 100nA from the supply. The con-
troller also offers full protection features for the condi-
tions of under voltage, over voltage, and the over cur-
rent. There is no need for a current sensing resistor
because the MOSFET on resistance is used for the sens-
ing element. The switching frequency is adjustable from
100 kHz to 300 kHz. Two packages TSSOP-24 and MLPQ-
24 are offered.
SC2544
Features
Independent dual-outputs
Wide input voltage range: 4.5V~28V
Adjustable output voltage down to 0.75V
Flexible power sequencing with enable and
power good output
Synchronous Buck topology with voltage mode
control
Out of phase operation to reduce cost of input
capacitor
10V internal regulator for gate driver to deliver
high efficiency
Programmable switching
frequency:100kHz~300kHz
Full protection: UVLO, OVP and programmable
OCP
No need for current sense resistor
Low shutdown current (100nA typical)
24 lead TSSOP and MLPQ packages
Fully WEEE and RoHS Compliant
Applications
Systems with 4.5V~28V input
LCDTV and PDPTV
Network and telecom systems
Portable devices
Typical Application Circuit
SC2544
VIN+
VCC
VO1
1
2
3
4
5
VIN+
6
7
8
VO1
9
10
11
FB1
12
VIN
VCC
EN
FB1
ERROUT1
SS1
ILIM1
BST1
DRVH1
PHASE1
DRVL1
PGND
AGND
ROSC
PWRGD
FB2
ERROUT2
SS2
ILIM2
BST2
DRVH2
PHASE2
DRVL2
PVCC
24
23
22
21
20
19
18
17
16
15
14
13
VCC
FB2
VO2
VIN+
PWGRD
FB2
ENABLE
FB1
Pinout shown as TSSOP-24.
Revision: August 10, 2005
1
www.semtech.com

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