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參數(shù)資料
| 型號： | ADP1149-3.3 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 42K |
| 代理商： | ADP1149-3.3 |
T o obtain the most recent version or complete data sheet, call our fax retrieval system at 1-800-446-6212 or visit our World Wide Web site at http://www.analog.com.
1
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Analog Devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing.
PRELIMINARY
TECHNICAL
a
ADP1149/1149-3.3/1149-5
PIN CONFIGURAT IONS
16-Lead Plastic DIP
16-Lead Plastic SO
14
13
12
11
10
9
16
15
1
2
3
4
7
6
5
8
TOP VIEW
(Not to Scale)
PGATE
SD2
PDRIVE
C
T
ADP1149-
3.3
ADP1149-
5
SENSE+
VFB (SD1)*
SIG GND
I
TH
SENSE–
V
IN
V
CC
V
CC
CAP
REG GND
PWR GND
NGATE
ADP1149
Hgh Efficiency Synchronous
Step-Down Swtching Regulators
FEATURES
Operation to 48 V Input Voltage
Ultrahigh Efficiency (Up to 95%)
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
GE NE RAL DE SCRIPT ION
T he ADP1149 is 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 fre-
quencies up to 250 kHz using a constant off-time current-mode
architecture.
Special onboard regulation and level-shift circuitry allow opera-
tion at input voltages from dropout to 48 V (60 V absolute
maximum). T he constant off-time architecture maintains con-
stant ripple current in the inductor, easing the design of wide
excellent line and load transient response. T he operating cur-
rent level is user programmable via an external current sense
resistor.
T he ADP1149 incorporates automatic power saving sleep
mode operation when load currents drop below the level
required for continuous operation. In sleep mode, standby
power is reduced to only about 8 mW at V
IN
= 12 V. In shut-
down, both MOSFET s are turned off.
C
IN
100μF
100V
SHUTDOWN 1
I
TH
C
T
V
IN
SENSE+
SENSE–
P,R-GNDS
ADP1149-5
P-DRIVE
C
T
470pF
1k
1000pF
P-CHANNEL
IRFR9024
L*
62μH
R
SENSE**
0.05
0V = NORMAL
>2V = SHUTDOWN
*COILTRONICS CTX62-2-MP
**KRL SL-1-C1-0R050J
S-GND
N-CHANNEL
IRFR024
N-DRIVE
D1
1N5819
3300pF
V
OUT
5V/ 2A
C
OUT
220μF
P-GATE
CAP
V
CC
V
CC
SHUTDOWN 2
0.068μF
3.3μF
V
IN
1N4148
0.047μF
Figure 1. Typical Application
REV. 0
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