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PDF SC1401ISS Data sheet ( Hoja de datos )
| Número de pieza | SC1401ISS | |
| Descripción | HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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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
1 page  
HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
November 21, 2000
ELECTRICAL CHARACTERISTICS (continued)
Unless specified: VDD1 = 12V, VDD2 = 12V V5V = 5V, SHDN = PSAVE = 5V, TA = -40 °C to +85 °C. Typical values are at TA = +25°C.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
FAULT DETECTION
Thermal Shutdown Threshold
Typical hysteresis = +10°V
150 °C
VDD1 Undervoltage Reset
Threshold
Falling edge of VDD1, hysteresis = 1%
4.2 4.5 4.8
V
V5V Undervoltage Reset
Threshold
Falling edge of V5V, hysteresis = 1%
3.75 4.0 4.25
V
FB Overvoltage Reset
Threshold
With respect to unloaded output voltage, typ.
Hysteresis = 1%
10
%
FB Undervoltage Reset
Threshold
With respect to unloaded output voltage, typ.
Hysteresis = 1%
-10
%
RESET Propagation Delay
FB Over/Under Voltage condition
1.5 µs
IOS Undervoltage Reset
Threshold
With respect to unloaded linear output voltage
-10
%
RESET Delay Time
With respect to fOSC
27,000 32,000 37,000 clks
LOGICAL INPUTS AND OUTPUTS
Logic Input High
SHDN,ENABLEIO
1.8
Logic Input Low
PSAVE,SYNC
1.6 V
Input Leakage Current
Logic Output Low Voltage
SHDN,ENABLEIO, PSAVE, SYNC
RESET, ISINK = 4mA
-1.0
1.0 µA
0.4 V
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
November 21, 2000
GND
SHDN
PSA V E
SY NC
ENABLEIO
HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
Figure 1: SC1401 Block Diagram
UV LO
V 5V
V BG
BG
REF
OCS
COUNTER
DA C
DIG ITA L
CO NT ROLL ER
V DD1
V DD2
GATEIO
IOS
BST
DH
PHASE
DL
PGND
CS H
CSL
RESET
POWER
GOOD
BG
REF
V GB
FB
PGND
Figure 2: Main PWM Modulator Control Block
© 2000 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC1401ISS.PDF ] | |
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