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零件编号 | ACT4012A | ||
描述 | Wide Input 1.5A Step Down Converter | ||
制造商 | Active-Semi | ||
LOGO | |||
1 Page
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.
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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页数 | 10 页 | ||
下载 | [ ACT4012A.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
ACT4012 | Wide Input 1.5A Step Down Converter | Active-Semi |
ACT4012A | Wide Input 1.5A Step Down Converter | Active-Semi |
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