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ACT4455YH-T Datasheet Download - Active-Semo

Номер произв ACT4455YH-T
Описание 36V/5A Step Down DC/DC Converter
Производители Active-Semo
логотип Active-Semo логотип 



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ACT4455YH-T Даташит, Описание, Даташиты
ACT4455
Rev 2, 21-Nov-12
36V/5A Step Down DC/DC Converter
FEATURES
7.5V to 36V Input Voltage
40V Input Voltage Surge
Up to 5A Output Current
Up to 12V Output Voltage
Dual Outputs with Independent Over Current
Protection
7.5% Accurate Over Current Protection (OCP)
Integrated 45mHigh Side Power FET
90% Efficiency at Heavy Load
Internal 3ms Soft Startup
Low Standby Input Current
Sleeping Mode at OCP, OTP and SCP
Zero Input and Output Currents at Over Current
and Short Circuit Protection
Auto Recovery into Full Load after Faults
Output Cord Voltage Drop Compensation
Stable with Low ESR Ceramic Output Capacitors
Internal Cycle-by-Cycle Current Control
Programmable Over Current Setting
SOP-8EP Package
APPLICATIONS
Automotive Industry
Dual-Output Car Charger
LCD-TV
GENERAL DESCRIPTION
ACT4455 is a wide input voltage step-down DC/DC
converter with high-side MOSFET integrated. It
provides up to 5A continuous output current at
200kHz switching frequency. The converter can be
configured as single output or dual outputs with
independent over current protection. The converter
achieves high efficiency and excellent load and line
regulation. The converter enters into hiccup and
sleeping mode and the converter power
consumption is nearly zero when output is
overloaded or shorted to ground. Other protection
features includes cycle-by-cycle current limit, under
voltage protection and thermal shutdown. The
device is available in SOP8-EP package.
100
90
80
70
60
50
0
Efficiency vs. Load current
VIN = 12V
VIN = 32V
VIN = 24V
1000
2000
3000
4000 5000
Efficiency (%)
Innovative PowerTM
- 1 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.







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ACT4455YH-T Даташит, Описание, Даташиты
ACT4455
Rev 2, 21-Nov-12
ORDERING INFORMATION
PART NUMBER OPERATION TEMPERATURE RANGE
ACT4455YH-T
-40°C to 85°C
PACKAGE
SOP-8EP
PINS
8
PACKING
TAPE & REEL
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN NAME
DESCRIPTION
1
CS1
The output current of VOUT1 is sensed by this pin. When the voltage on this pin reaches
116mV for 750µs, the IC shuts down for 2.5 seconds before initiating a restartup.
2 SW Switch Output. Connect this pin to the switching end of the external inductor.
3
HSB
High Side Bias. This pin acts as the positive rail for the high-side switch’s gate driver.
Connect a 22nF-100nF capacitor between HSB and SW pins.
4
GND
Ground.
5
COMP
Compensation Node. COMP is used to compensate the voltage regulation loop.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
6 FB resistive voltage divider from the output voltage. The feedback threshold is 0.808V.
See Setting the Output Voltage.
7 IN Input Supply. Bypass this pin to GND with a 10µF or greater low ESR capacitor.
8
CS2
The output current of VOUT2 is sensed by this pin. When the voltage on this pin reaches
116mV for 750µs, the IC shuts down for 2.5 seconds and then restarts.
Exposed Pad Exposed Pad. Connect this pad to thick copper plane via copper vias.
Innovative PowerTM
- 2 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.







No Preview Available !

ACT4455YH-T Даташит, Описание, Даташиты
ACT4455
Rev 2, 21-Nov-12
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
IN to GND
SW to GND
HSB to GND
FB, CS1, CS2, COMP to GND
Junction to Ambient Thermal Resistance
Operating Junction Temperature
Storage Junction Temperature
Lead Temperature (Soldering 10 sec.)
VALUE
-0.3 to 44
-0.3 to VIN + 0.3
VSW - 0.3 to VSW + 7
-0.3 to + 6
50
-40 to 150
-55 to 150
300
UNIT
V
V
V
V
°C/W
°C
°C
°C
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
Innovative PowerTM
- 3 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.










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