High Efficiency Synchronous
Step-Down Switching Regulators
a
ADP1148, ADP1148-3.3, ADP1148-5
FUNCTIO NAL BLO CK D IAGRAM
ADJUSTABLE
FEATURES
Operation From 3.5 V to 18 V Input Voltage
Ultrahigh Efficiency > 95%
Low Shutdow n Current
VERSION
SIGNAL
PWR
GND
V
V
P-DRIVE N-DRIVE
GND SENSE(+)
SENSE(–)
7
IN
FB
Current Mode Operation for Excellent Line and Load
Transient Response
3
1
12
11
8
14
9
ADP1148
High Efficiency Maintained Over Wide Current Range
Logic Controlled Micropow er Shutdow n
Short Circuit Protection
NON-OVERLAP
DRIVE
V
B
2
R
Very Low Dropout Operation
SLEEP
Q
S
1
Synchronous FET Sw itching for High Efficiency
Adaptive Nonoverlap Gate Drives
Q
R
S
C
S
V
TH1
APPLICATIONS
13k⍀
10mV to
150mV
V
TH2
T
G
Notebook and Palm top Com puters
Portable Instrum ents
Battery Operated Digital Devices
Industrial Pow er Distribution
Avionics System s
100k⍀
1.25V
V
IN
OFF-TIME
CONTROL
REFERENCE
SENSE(–)
V
FB
10
5
4
6
I
SHUTDOWN
INT V
CC
C
TH
T
Telecom Pow er Supplies
GPS System s
Cellular Telephones
T he 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. T he operating current level is user
programmable via an external current sense resistor.
GENERAL D ESCRIP TIO N
T he 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. T hese
devices drive external complementary power MOSFET s at
switching frequencies up to 250 kHz using a constant off-time
current-mode architecture.
T he 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 MOSFET s are turned off.
TYP ICAL AP P LICATIO NS
V
(5.2V TO 18V)
IN
100
95
90
85
80
+
+
C
IN
1F
V
V
= 6V
100F
IN
V
10nF
IN
INT V
CC
P-CH
IRF7204
P-DRIVE
= 10V
IN
ADP1148
R
**
L*
SENSE
0V = NORMAL
62H
>1.5V = SHUTDOWN
0.05⍀
SHUTDOWN
V
OUT
5V/2A
I
SENSE(+)
TH
1000pF
R
C
C
SENSE(–)
N-DRIVE
T
+
C
OUT
1k⍀
75
70
N-CH
IRF7403
390F
C
T
470pF
FIGURE 1 CIRCUIT
0.02
C
C
C1
S-GND P-GND
3300pF
10BQ040
2
0.2
LOAD CURRENT – A
*COILTRONICS CTX-68-4
**KRL SL-1-C1-0R050L
Figure 1. High Efficiency Step-Down Converter
REV. A
Figure 2. ADP1148-5 Typical Efficiency
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1997
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