ACT4072SH Active-Semi, Inc., ACT4072SH Datasheet

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ACT4072SH

Manufacturer Part Number
ACT4072SH
Description
Wide Input 2A Step Down Converter
Manufacturer
Active-Semi, Inc.
Datasheet
1.ACT4072SH.pdf (10 pages)

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Innovative Power
FEATURES
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APPLICATIONS
•
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TYPICAL APPLICATION CIRCUIT
2A Output Current
Up to 95% Efficiency
Up to 30V Input Range
6µA Shutdown Supply Current
420kHz Switching Frequency
Adjustable Output Voltage
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Frequency Fold-Back at Short Circuit
Stability with Wide Range of Capacitors,
SOP-8 Package
TFT LCD Monitors or Televisions and HDTV
Portable DVD Players
Car-Powered or Battery-Powered Equipment
Set-Top Boxes
Telecom Power Supplies
DSL and Cable Modems and Routers
Including Low ESR Ceramic Capacitors
Active-Semi
TM
ENABLE
V
IN
Up to 30V
+
IN
EN
ACT4072
G
BS
COMP
SW
FB
- 1 -
Wide Input 2A Step Down Converter
GENERAL DESCRIPTION
The ACT4072 is a current-mode step-down DC/DC
converter that generates up to 2A output current at
420kHz switching frequency. The device utilizes
Active-Semi’s proprietary ISOBCD30 process for
operation with input voltage up to 30V.
Consuming only 6µA in shutdown mode, the
ACT4072 is highly efficient with peak efficiency at
95% when in operation. Protection features include
cycle-by-cycle current limit, thermal shutdown, and
frequency fold-back at short circuit.
The ACT4072 is available in SOP-8 package and
requires very few external devices for operation.
ACT4072
Copyright © 2008 Active-Semi, Inc.
www.active-semi.com
V
Rev2, 27-May-08
OUT

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ACT4072SH Summary of contents

Page 1

... Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency fold-back at short circuit. The ACT4072 is available in SOP-8 package and requires very few external devices for operation ACT4072 COMP + - 1 - ACT4072 Rev2, 27-May-08 V OUT www.active-semi.com Copyright © 2008 Active-Semi, Inc. ...

Page 2

... Low-Side Power Switch. This pin has a small internal pull up current to a high level voltage when pin is not connected. 8 N/C Not Connected. TM Innovative Power PACKAGE -40°C to 85°C -40°C to 85° ACT4072SH SOP-8 PIN DESCRIPTION - 2 - ACT4072 Rev2, 27-May-08 PINS SOP-8 8 SOP-8 8 TAPE & ...

Page 3

... MIN TYP MAX UNIT 4 1.198 1.222 1.246 V 0.13 Ω 10 Ω µA 2.4 3 A/V 550 µA/V 4000 V/V 340 420 500 kHz 60 kHz 0 µ µA 0 160 °C www.active-semi.com Copyright © 2008 Active-Semi, Inc. ...

Page 4

... Thermal Shutdown The ACT4072 automatically turns off when its junc- tion temperature exceeds 160° ACT4072 Rev2, 27-May- 0.13O HIGH-SIDE POWER SWITCH 10O LOW-SIDE Ω POWER SWITCH G = 0.5V. FB www.active-semi.com Copyright © 2008 Active-Semi, Inc. BS Ω SW ...

Page 5

... ACT4072 = OUTMAX RIPPLE ESR OUT is the maximum output current, OUTMAX is the ripple factor, R ESR multiplied by the ripple current. ESR www.active-semi.com Copyright © 2008 Active-Semi, Inc. Rev2, 27-May-08 (3) is the ESR is the SW is OUT is ESR ...

Page 6

... ESR output COMP2 www.active-semi.com Copyright © 2008 Active-Semi, Inc. Rev2, 27-May-08 (F) (10) (11) (F) ⎞ ⎟ ⎟ (Ω) (12) ⎠ ...

Page 7

... ESR tantalum capacitors. TM Innovative Power IC1 ACT4072 COMP C2 1.5nF C5 100pF R3 15k - 7 - ACT4072 Rev2, 27-May- 22µH/3A 10nF 5V/2A V OUT R1 39.2k C4 22µF/10V D1 ceramic or R2 47µH/6.3 SP 12.1k Cap www.active-semi.com Copyright © 2008 Active-Semi, Inc. ...

Page 8

... Shutdown Supply Current vs. Input Voltage Input Voltage (V) Feedback Voltage vs. Temperature 1. 12V IN 1.25 1.23 1.21 1.19 1.17 -20 - Temperature (°C) www.active-semi.com Copyright © 2008 Active-Semi, Inc OUT L = 22µ 10µ 22µF OUT 120 100 ...

Page 9

... TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 3, unless otherwise specified.) Load Transient Response V OUT 200mV/div 1A I OUT 0A 100µs/div TM Innovative Power V OUT 200mV/div 2A I OUT 12V ACT4072 Rev2, 27-May-08 Load Transient Response V = 12V IN 100µs/div www.active-semi.com Copyright © 2008 Active-Semi, Inc. ...

Page 10

... 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 sales@active-semi.com or visit http://www ...

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