ACT4455YH-T

ACT4455YH-T Datasheet

ACT4455

Part	Datasheet
ACT4455YH-T	ACT4455YH-T (pdf)

Related Parts	Information
EA4455YH	EA4455YH

PDF Datasheet Preview
ACT4455 36V/5A Step Down DC/DC Converter • 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 • Accurate Over Current Protection OCP • Integrated High 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 • Automotive Industry • Dual-Output Car Charger • LCD-TV 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. Output current V 100 90 80 70 60 50 0 ACT4455-001 Efficiency vs. Load current VIN = 12V VIN = 32V VIN = 24V 1000 2000 3000 4000 5000 Efficiency % Innovative PowerTM Copyright 2012 Active-Semi, Inc. ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE ACT4455YH-T -40°C to 85°C PACKAGE SOP-8EP PINS PACKING TAPE & REEL PIN CONFIGURATION PIN DESCRIPTIONS NAME 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 seconds before initiating a restartup. Switch Output. Connect this pin to the switching end of the external inductor. 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. Ground. 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 resistive voltage divider from the output voltage. The feedback threshold is 0.808V. See Setting the Output Voltage. Input Supply. Bypass this pin to GND with a 10µF or greater low ESR capacitor. 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 seconds and then restarts. Exposed Pad Exposed Pad. Connect this pad to thick copper plane via copper vias. Innovative PowerTM Copyright 2012 Active-Semi, Inc. 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 to 44 to VIN + VSW - to VSW + 7 to + 6 50 -40 to 150 -55 to 150 UNIT 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 Copyright 2012 Active-Semi, Inc. ELECTRICAL CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise specified. PARAMETER

PDF Datasheet Preview

ACT4455
36V/5A Step Down DC/DC Converter
• 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
• Accurate Over Current Protection OCP
• Integrated High 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
• Automotive Industry
• Dual-Output Car Charger
• LCD-TV

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.

Output current V
100 90 80 70 60 50 0

ACT4455-001

Efficiency vs. Load current

VIN = 12V

VIN = 32V

VIN = 24V
1000
2000
3000
4000 5000

Efficiency %

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.
ORDERING INFORMATION

PART NUMBER OPERATION TEMPERATURE RANGE

ACT4455YH-T
-40°C to 85°C

PACKAGE

SOP-8EP

PINS

PACKING

TAPE & REEL

PIN CONFIGURATION

PIN DESCRIPTIONS

NAME

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 seconds before initiating a restartup.

Switch Output. Connect this pin to the switching end of the external inductor.

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.

Ground.

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
resistive voltage divider from the output voltage. The feedback threshold is 0.808V.

See Setting the Output Voltage.

Input Supply. Bypass this pin to GND with a 10µF or greater low ESR capacitor.

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 seconds and then restarts.

Exposed Pad Exposed Pad. Connect this pad to thick copper plane via copper vias.

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.

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
to 44 to VIN + VSW - to VSW + 7
to + 6 50
-40 to 150 -55 to 150

UNIT

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

Copyright 2012 Active-Semi, Inc.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = 25°C, unless otherwise specified.

PARAMETER

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Datasheet ID: ACT4455YH-T 522422