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參數資料
| 型號： | ADP1148AR-3.3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23; Package: SOT; No of Pins: 5; Temperature Range: 0°C to +70°C |
| 中文描述： | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, SO-14 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 191K |
| 代理商： | ADP1148AR-3.3 |
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.
a
ADP1148, ADP1148-3.3, ADP1148-5
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
Hgh Efficiency Synchronous
Step-Down Swtching Regulators
FUNCT IONAL BLOCK DIAGRAM
Q
R
S
V
TH1
V
SENSE(–)
V
FB
V
TH2
1.25V
OFF-TIME
CONTROL
100k
V
13k
V
B
V
IN
P-DRIVE
3
SENSE(+)
SENSE(–)
G
4
6
C
T
I
TH
SHUTDOWN
8
1
ADP1148
10mV to
150mV
C
INT V
CC
REFERENCE
5
10
T
N-DRIVE
PWR
GND
14
12
AVERSION
V
FB
9
7
S
1
Q
R
S
2
V
SLEEP
SIGNAL
GND
11
NON-OVERLAP
DRIVE
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
GE NE RAL DE SCRIPT ION
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.
V
IN
INT V
CC
I
TH
C
T
S-GND
P-DRIVE
SENSE(+)
SENSE(–)
SHUTDOWN
N-DRIVE
P-GND
ADP1148
+
+
P-CH
IRF7204
N-CH
IRF7403
1000pF
C
470pF
R
C
1k
V
C
C
3300pF
C1
10BQ040
L*
62
m
H
R
SENSE
**
0.05
V
+
C
OUT
390
m
F
C
IN
100
m
F
V
IN
(5.2V TO 18V)
1
m
F
10nF
0V = NORMAL
>1.5V = SHUTDOWN
*COILTRONICS CTX-68-4
**KRL SL-1-C1-0R050L
V
OUT
5V/2A
Figure 1. High Efficiency Step-Down Converter
Figure 2. ADP1148-5 Typical Efficiency
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.
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 V
IN
= 10 V. In shutdown,
both MOSFET s are turned off.
T Y PICAL APPLICAT IONS
LOAD CURRENT – A
100
85
70
0.02
2
95
90
80
75
E
0.2
V
IN
= 6V
V
IN
= 10V
FIGURE 1 CIRCUIT
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