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PDF ACT4082A Data sheet ( Hoja de datos )
| Número de pieza | ACT4082A | |
| Descripción | 1.4MHz Step-Down DC/DC Converter | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Active-Semi
ACT4082A
Rev0, 16-May-08
16V, 1.2A, 1.4MHz Step-Down DC/DC Converter in SOT23-6
FEATURES
• Wide 4.5V to 16V Input Voltage Range
• 1.2A Output Current (12VIN to 5VOUT)
• Output Adjustable Down to 0.81V
• 0.3Ω Internal Power MOSFET
• Up to 92% Efficiency
• Stable with Low ESR Ceramic Output Capacitors
• Fixed 1.4MHz Operating Frequency
• Internal Soft-Start Function
• Over Current Protection with Hiccup-Mode
• Thermal Shutdown
• Available in a SOT23-6 Package
APPLICATIONS
• TFT LCD Monitors
• Portable DVDs, Headphones, MP3 Players, etc.
• Car-Powered or Battery-Powered Equipment
• Set-Top Boxes
• Telecom Power Supplies
• DSL and Cable Modems and Routers
GENERAL DESCRIPTION
The ACT4082A is a current-mode step-down
DC/DC converter that supplies up to 1.2A into 5V
from a 12V input. 1.4MHz switching frequency al-
lows the use of tiny external components, and inter-
nal loop compensation provides simple, stable
power supplies with a minimum of external compo-
nents. Optimized for use with ceramic input and
output capacitors, the ACT4082A provides a very
compact 1.2A power supply for space constrained
mobile and consumer applications.
The ACT4082A operates over a wide input voltage
range and utilizes current-mode operation to pro-
vide excellent line and load transient response
while requiring no external compensation compo-
nents. Fault protection includes cycle-by-cycle cur-
rent limiting, frequency fold-back, hiccup mode, and
thermal shutdown. Internal soft-start provides a
controlled startup with no overshoot, even at light
loads.
The ACT4082A is available in a tiny SOT23-6 pack-
age and requires very few external components.
TYPICAL APPLICATION CIRCUIT
4.5V to 16V
VIN
ON
OFF
IN BST
Active-Semi
ACT4082A SW
EN
FB
G
VOUT
Innovative PowerTM
- 1 - www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
1 page  
Active-Semi
ACT4082A
Rev0, 16-May-08
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Circuit of Figure 2, VIN = 12V, L = 4.7µH, C1 = 10µF, C2 = 22µF, TA = +25°C, unless otherwise specified.)
Load Transient Response
ILOAD = 200mA to 800mA
CH1
Load Transient Response
ILOAD = 200mA to 1.2A
CH1
CH2
CH1: VOUT, 50mV/div
CH2: ILOAD, 500mA/div
TIME: 100µs/div
Start-up Waveforms
ILOAD = 0mA
CH1
CH2
CH3
CH1: VOUT, 2V/div
CH2: VSW, 10V/div
CH3: IL, 1A/div
TIME: 200µs/div
Steady State Switching Waveforms
CH1
ILOAD = 1A
CH2
CH3
CH1: VOUT, 50mV/div, (AC COUPLED)
CH2: VSW, 10V/div
CH3: IL, 500mA/div
TIME: 400ns/div
CH2
CH1: VOUT, 50mV/div
CH2: ILOAD, 500mA/div
TIME: 100µs/div
Start-up Waveforms
CH1
ILOAD = 1A
CH2
CH3
CH4
CH1: VEN, 2V/div
CH2: VOUT, 2V/div
CH3: VSW, 10V/div
CH4: IL, 1A/div
TIME: 400µs/div
Hiccup Mode Switching Waveforms
CH1
CH2
CH1: VOUT, 100mV/div, (AC COUPLED)
CH2: IL, 1A/div
TIME: 1ms/div
Innovative PowerTM
- 5 - www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
5 Page 
Active-Semi
ACT4082A
Rev0, 16-May-08
PACKAGE OUTLINE
SOT23-6 PACKAGE OUTLINE AND DIMENSIONS
D
b
e
e1
θ
0.2
c
SYMBOL
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
θ
DIMENSION IN
MILLIMETERS
MIN MAX
1.050 1.250
0.000 0.100
1.050 1.150
0.300 0.500
0.100 0.200
2.820 3.020
1.500 1.700
2.650 2.950
0.950 TYP
1.800 2.000
0.700 REF
0.300 0.600
0° 8°
DIMENSION IN
INCHES
MIN MAX
0.041 0.049
0.000 0.004
0.041 0.045
0.012 0.020
0.004 0.008
0.111 0.119
0.059 0.067
0.104 0.116
0.037 TYP
0.071 0.079
0.028 REF
0.012 0.024
0° 8°
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each
product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use
as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of
the use of any product or circuit described in this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact
1270 Oakmead Parkway, Suite 310, Sunnyvale, California 94085-4044, USA
Innovative PowerTM
- 11 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
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| PDF Descargar | [ Datasheet ACT4082A.PDF ] | |
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