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Analog Devices - High Efficiency Synchronous Step-Down Switching Regulators

Numéro de référence ADP1148AR-5
Description High Efficiency Synchronous Step-Down Switching Regulators
Fabricant Analog Devices 
Logo Analog Devices 





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ADP1148AR-5 fiche technique
a
High Efficiency Synchronous
Step-Down Switching Regulators
ADP1148, ADP1148-3.3, ADP1148-5
FEATURES
Operation From 3.5 V to 18 V Input Voltage
Ultrahigh Efficiency > 95%
Low Shutdown Current
Current Mode Operation for Excellent Line and Load
Transient Response
High Efficiency Maintained Over Wide Current Range
Logic Controlled Micropower Shutdown
Short Circuit Protection
Very Low Dropout Operation
Synchronous FET Switching for High Efficiency
Adaptive Nonoverlap Gate Drives
APPLICATIONS
Notebook and Palmtop Computers
Portable Instruments
Battery Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies
GPS Systems
Cellular Telephones
GENERAL DESCRIPTION
The ADP1148 is part of a family of synchronous step-down
switching regulator controllers featuring automatic sleep mode
to maintain high efficiencies at low output currents. These
devices drive external complementary power MOSFETs at
switching frequencies up to 250 kHz using a constant off-time
current-mode architecture.
FUNCTIONAL BLOCK DIAGRAM
ADP1148
ADJUSTABLE
PWR SIGNAL
VERSION
VIN P-DRIVE N-DRIVE GND GND SENSE(+) VFB SENSE(–)
31
14 12 11
89
7
SLEEP
S
VTH2
4
CT
NON-OVERLAP
DRIVE
1
QR
VTH1
S
T
2
R
QS
C
10mV to
150mV
OFF-TIME
CONTROL
VIN
SENSE(–)
VFB
6
ITH
V
B
13k
G
1.25V 100k
REFERENCE
10
SHUTDOWN
5
INT VCC
The constant off-time architecture maintains constant ripple
current in the inductor, easing the design of wide input range
converters. Current-mode operation provides excellent line and
load transient response. The operating current level is user
programmable via an external current sense resistor.
The ADP1148 incorporates automatic Power Saving Sleep
Mode operation when load currents drop below the level re-
quired for continuous operation. In sleep mode, standby power
is reduced to only about 2 mW at VIN = 10 V. In shutdown,
both MOSFETs are turned off.
+
1F
VIN (5.2V TO 18V)
10nF
VIN
INT VCC
P-DRIVE
0V = NORMAL
>1.5V = SHUTDOWN
ADP1148
SHUTDOWN
ITH SENSE(+)
RC
1k
CC
3300pF
CT SENSE(–)
CT N-DRIVE
470pF
S-GND P-GND
TYPICAL APPLICATIONS
CIN +
100F
P-CH
IRF7204
L* RSENSE**
62H 0.05
VOUT
5V/2A
1000pF
N-CH
IRF7403
C1
10BQ040
+ COUT
390F
*COILTRONICS CTX-68-4
**KRL SL-1-C1-0R050L
100
VIN = 6V
95
VIN = 10V
90
85
80
75
FIGURE 1 CIRCUIT
70
0.02
0.2
LOAD CURRENT – A
2
Figure 1. High Efficiency Step-Down Converter
Figure 2. ADP1148-5 Typical Efficiency
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1997

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