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SC1401 Datasheet Preview

SC1401 Datasheet

HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER

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HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
November 21, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1401 is a synchronous buck regulator designed
to power the latest generation microprocessors in
battery operated systems. The SC1401 may be used
to provide both the I/O and core voltages utilizing
synchronous rectification for the core supply voltage
and an LDO N-Channel MOSFET controller for the I/O
supply voltage. A 1.25 volt reference allows lower
output voltages required by today’s portable
microprocessors.
The synchronous buck regulator is capable of
achieving efficiencies up to 95%. The gate drive
circuitry can deliver 2.0A peak currents, allowing the
use of N-channel MOSFETs for lower switching and
conduction losses.
A digital soft start is provided to ensure orderly start up
of the power supply without the need for external
components. At light load in power save mode, the
controller changes mode of operation by missing gate
drive cycles, thus reducing gate drive current and
improving efficiency. A logic high on PSAVE disables
the power saving mode thus reducing noise. The
SC1401 is fabricated in a high performance BiCMOS
process. This process reduces the power dissipation
in low current and shutdown operation modes and
improves efficiency.
The LDO controller is a high performance positive
voltage regulator designed to provide a low noise
power source to the microprocessor peripherals by
driving a low cost external N-Channel MOSFET.
VIN
C1 C2 C3 C4 C5
FEATURES
>90% Efficiency (SMPS)
6.0V to 30V Input range
1.25V to 5.5V Adjustable output (SMPS)
PWM and LDO regulator outputs
High output gate drive of 2 Amps (SMPS)
Power save mode for light load operation
200kHz/300kHz fixed-frequency PWM operation
2mA Typical quiescent current
2µA Typical shutdown current
APPLICATIONS
Notebook and palmtop computers
LCD monitors
Internet appliances
ORDERING INFORMATION
DEVICE
SC1401ISS
PACKAGE
SSOP-20
TEMP. (TA)
-40°C - +85°C
Notes
(1) Add suffix “TR” for tape and reel.
TYPICAL APPLICATION CIRCUIT
ENABLE_IO
RESET
PSAVE
SYNC
SHDN
R3
+5V
C10 C11
U1 SC1401ISS
1 SYNC
PSAVE 20
2 SHDN
RESET 19
3 FB
ENABLEIO 18
4 VDD1
IOS 17
5 GND
GATEIO 16
6 CSL
VDD2 15
7 CSH
BST 14
8 V5V
DH 13
9 DL
PHASE 12
10 PGND
PGND 11
VDD2
C6
Q1
VO_LINEAR
D1
R1
C7 C8
+5V
D2
C9
R2
Q2
D4
Q3
L1
C15
R6
R4
VO_SMPS
C12 C13 C14
D3
R5
R7 C16
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320




Semtech Corporation

SC1401 Datasheet Preview

SC1401 Datasheet

HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER

No Preview Available !

HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
November 21, 2000
PIN DESCRIPTION
Pin #
1
Pin Name
SYNC
2 SHDN
3 FB
4 VDD1
5 GND
6 CSL
7 CSH
8 V5V
9 DL
10 PGND
11 PGND
12 PHASE
Pin Function
Oscillator control/synchronization input. Connect to V5V for 300kHz. Connect to
GND for 200kHz. For external clock synchronization in the 240kHz to 350kHz
range. A high-to-low transition causes a new cycle start.
Logic Low shuts down the switching regulator.
Feedback input for the SMPS. FB selects fixed 1.25V output voltage setting
when tied to VOUT. Connect FB to a resistor divider for adjustable output mode.
V O (SMPS)
=
1.25
1 +
R8
R9

Refer to page 9.
Supply input from battery (6V to 30V).
Low noise analog ground and feedback reference point.
Inverting input to current sense amplifier. Also serves as the feedback input in
fixed output mode.
Non-Inverting input to current sense amplifier. Current limit level is 120mV
referenced to CSL.
5 volt external supply used to power the gate drives, internal control and
reference of the SC1401.
Gate drive output for low side synchronous rectifier MOSFET.
Device power ground.
Device power ground.
Inductor switching node connected to the source of high side MOSFET
and drain of low side MOSFET.
13 DH
14 BST
15 VDD2
16 GATEIO
17 IOS
18 ENABLEIO
19 RESET
20 PSAVE
Gate drive output for high side N-Channel MOSFET. DH is a floating driver
output driven from the floating voltage across BST to PHASE.
Boost capacitor connection for the high side driver.
Supply voltage input for the linear FET controller.
Gate drive output for the linear FET controller.
Sense input voltage for the adjustable voltage linear FET controller.
V O (Linear)
= 1.25
1 +
R5
R6

Refer
to
page
9.
Logic low shuts down the linear FET controller.
Active-Low reset output.
A logic low enables power saving mode.
Note: All logic level inputs and outputs are open collector TTL compatible.
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320


Part Number SC1401
Description HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER
Maker Semtech Corporation
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SC1401 Datasheet PDF






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