EA4533YH

EA4533YH Datasheet

Part	Datasheet
EA4533YH	EA4533YH (pdf)

Related Parts	Information
ACT4533YH-T	ACT4533YH-T

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ACT4533 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter • 40V Input Voltage Surge • 32V Steady State Operation • Up to 3A Output Current • Constant Current Output with Input up to 32V • Output Voltage up to 12V • 125kHz Switching Frequency Eases EMI Design • Good EMI Performance to Pass EN55022 Radiation Regulation without adding EMI Components • Patent Pending Active CC Sensorless Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count • Resistor Programmable − Current Limit from 1.5A to 3A − Patented Cable Compensation from 0 to • CC Accuracy − Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR • 2% Feedback Voltage Accuracy • Up to 92% Efficiency • Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin • SOP-8EP Package • Car Charger/ Adaptor • Rechargeable Portable Devices • General-Purpose CC/CV Supply ACT4533 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that operates in either CV Constant Output Voltage mode or CC Constant Output Current mode. ACT4533 provides up to 3A output current at 125kHz switching frequency. Active CC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The ACT4533 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP8EP package and require very few external devices for operation. Innovative PowerTM Output Voltage V ACT4533-001 CC/CV Curve VIN = 24V VIN = 18V VIN = 12V 400 800 1200 1600 2000 2400 2800 Output Current mA Copyright 2013 Active-Semi, Inc. ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE ACT4533YH-T -40°C to 85°C ACT4533YH-T1026 -40°C to 85°C PACKAGE SOP-8EP SOP-8EP PINS PACKING TAPE & REEL TAPE & REEL PIN CONFIGURATION PIN DESCRIPTIONS NAME High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a 22nF capacitor from HSB pin to SW pin. Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as close to the IC as possible. Power Switching Output to External Inductor. Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, and ISET to this GND, and connect this GND to power GND at a single point for best noise immunity. Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor divider between output and GND to set the output voltage. COMP Error Amplifier Output. This pin is used to compensate the converter. Enable Input. EN is pulled up to 5V with a 4uA current, and contains a precise 1.6V logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC. Drive to a logic-low to disable the IC and enter shutdown mode. ISET Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current. Exposed Pad Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias. Innovative PowerTM Copyright 2013 Active-Semi, Inc. ABSOLUTE MAXIMUM RATINGSc PARAMETER IN to GND SW to GND HSB to GND FB, EN, ISET, COMP to GND Junction to Ambient Thermal Resistance Operating Junction Temperature Storage Junction Temperature Lead Temperature Soldering 10 sec. VALUE to 40 -1 to VIN + 1 VSW - to VSW + 7 to + 6 46 -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.

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ACT4533

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
• 40V Input Voltage Surge
• 32V Steady State Operation
• Up to 3A Output Current
• Constant Current Output with Input up to 32V
• Output Voltage up to 12V
• 125kHz Switching Frequency Eases EMI Design
• Good EMI Performance to Pass EN55022

Radiation Regulation without adding EMI Components
• Patent Pending Active CC Sensorless Constant

Current Control
− Integrated Current Control Improves

Efficiency, Lowers Cost, and Reduces Component Count
• Resistor Programmable
− Current Limit from 1.5A to 3A − Patented Cable Compensation from 0 to
• CC Accuracy
− Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR
• 2% Feedback Voltage Accuracy
• Up to 92% Efficiency
• Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin
• SOP-8EP Package
• Car Charger/ Adaptor
• Rechargeable Portable Devices
• General-Purpose CC/CV Supply

ACT4533 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that operates in either CV Constant Output Voltage mode or CC Constant Output Current mode. ACT4533 provides up to 3A output current at 125kHz switching frequency.

Active CC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The ACT4533 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss.

Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP8EP package and require very few external devices for operation.

Innovative PowerTM

Output Voltage V

ACT4533-001

CC/CV Curve

VIN = 24V

VIN = 18V

VIN = 12V
400 800 1200 1600 2000 2400 2800

Output Current mA

Copyright 2013 Active-Semi, Inc.
ORDERING INFORMATION

PART NUMBER OPERATION TEMPERATURE RANGE

ACT4533YH-T
-40°C to 85°C

ACT4533YH-T1026
-40°C to 85°C

PACKAGE

SOP-8EP SOP-8EP

PINS

PACKING

TAPE & REEL TAPE & REEL

PIN CONFIGURATION

PIN DESCRIPTIONS

NAME

High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a 22nF capacitor from HSB pin to SW pin.

Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as close to the IC as possible.

Power Switching Output to External Inductor.

Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return

FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
point for best noise immunity.

Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor divider between output and GND to set the output voltage.

COMP

Error Amplifier Output. This pin is used to compensate the converter.

Enable Input. EN is pulled up to 5V with a 4uA current, and contains a precise 1.6V
logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.

Drive to a logic-low to disable the IC and enter shutdown mode.

ISET

Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current.

Exposed Pad

Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias.

Innovative PowerTM

Copyright 2013 Active-Semi, Inc.

ABSOLUTE MAXIMUM RATINGSc

PARAMETER

IN to GND SW to GND HSB to GND FB, EN, ISET, COMP to GND Junction to Ambient Thermal Resistance Operating Junction Temperature Storage Junction Temperature Lead Temperature Soldering 10 sec.

VALUE
to 40 -1 to VIN + 1 VSW - to VSW + 7 to + 6
46 -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.

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Datasheet ID: EA4533YH 522450