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PDF ( 数据手册 , 数据表 ) ACT4012A

零件编号 ACT4012A
描述 Wide Input 1.5A Step Down Converter
制造商 Active-Semi
LOGO Active-Semi LOGO 


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ACT4012A 数据手册, 描述, 功能
ACT4012A
Rev0, 16-May-08
Wide Input 1.5A Step Down Converter
FEATURES
1.5A Output Current
Up to 94% Efficiency
Up to 20V Input Range
10µA Shutdown Supply Current
420kHz Switching Frequency
Adjustable Output Voltage
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Frequency Foldback at Short Circuit
Stability with Wide Range of Capacitors,
Including Low ESR Ceramic Capacitors
SOP-8 Package
APPLICATIONS
TFT LCD Monitors
Portable DVDs
Car-Powered or Battery-Powered Equipments
S-Top Boxes
Telecom Power Supplies
DSL and Cable Modems and Routers
Termination Supplies
GENERAL DESCRIPTION
The ACT4012A is a current-mode step-down
DC/DC converter that generates up to 1.5A output
420kHz switching frequency. The device utilizes
Active-Semi’s proprietary ISOBCD20 process for
operation with input voltages up to 20V.
Consuming only 10µA in shutdown mode, the
ACT4012A is highly efficient with peak efficiency at
94% when in operation. Protection features include
cycle-by-cycle current limit, thermal shutdown, and
frequency foldback at short circuit.
The ACT4012A is available in a SOP-8 package
and requires very few external devices for opera-
tion.
TYPICAL APPLICATION CIRCUIT
12V
VIN
ENABLE
BS
IN SW
ACT4012A
EN
G
FB
COMP
+
5V/1.5A
Innovative PowerTM
- 1 - www.active-semi.com
Copyright © 2008 Active-Semi, Inc.







ACT4012A pdf, 数据表
TYPICAL PERFORMANCE CHARACTERISTICS
(Circuit of Figure 3, unless otherwise specified.)
ACT4012A
Rev0, 16-May-08
Efficiency vs. Load
100
95
90
85
80 VIN = 12V VIN = 20V
75 VIN = 8V
70
65 VOUT = 5V
60
L= 22µH
COUT = 22µF/cera
55
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
Load (A)
Surface Temperature vs. Load
100
80
60
VIN = 20V
40
VIN = 12V VIN = 8V
20
0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5
Load (A)
Feedback Voltage vs. Junction Temperature
1.30
1.29
1.28
1.27
1.26
-40
0 40 80
Junction Temperature (°C)
120
95
90
85
80
75
70
65
60
0.1
Efficiency vs. Load
VIN = 8V
VIN = 12V
VIN = 20V
VOUT = 3.3V
L= 15µH
COUT = 22µF/cera
0.3 0.5 0.7 0.9 1.1 1.3 1.5
Load (A)
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
6
Output Voltage vs. Input Voltage
IOUT = 0.5A
IOUT = 1A
IOUT = 1.5A
8 10 12 14 16 18
Input Voltage (V)
20
Shutdown Supply current vs. Input Voltage
25
20
15
10
5
0
12 16
Input Voltage (V)
20
Innovative PowerTM
- 8 - www.active-semi.com
Copyright © 2008 Active-Semi, Inc.














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