ACT4303YH-T

ACT4303YH-T Datasheet

Active-Semi

Part	Datasheet
ACT4303YH-T	ACT4303YH-T (pdf)

Related Parts	Information
EA4303YH	EA4303YH

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Active-Semi ACT4303 30V/3A Sensorless CC/CV Step-Down DC/DC Converter • 32V Input Voltage Surge • 30V Steady State Input Voltage • Up to 3A Output Current • Output Voltage up to 12V • 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 • CC Accuracy − Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR • 2% Feedback Voltage Accuracy • Up to 94% Efficiency • 225kHz Switching Frequency Eases EMI Design • Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin • SOP-8EP Package • USB Chargers • LCD TV and Monitors • Digital Video Recorders • Set-Top Box • Battery Chargers • General-Purpose CC/CV Power Supplies ACT4303 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. ACT4303 provides up to 3A output current at 225kHz 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 ACT4303 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. Input 10V~30V ACT4303 ISET GND COMP 22nF L1 30µH R2 52k C1 47µF R1 11.5k 2.2nF 10k R3 8.2k D1 SK34 C4 100µF Innovative PowerTM Output Voltage V CC/CV Curve VIN = 24V VIN = 12V Output Current A Copyright 2011 Active-Semi, Inc. ACT4303-001 Active-Semi ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE ACT4303YH-T -40°C to 85°C PACKAGE SOP-8EP PINS PACKING 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 2011 Active-Semi, Inc. Active-Semi 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 34 -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. Innovative PowerTM

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Active-Semi

ACT4303
30V/3A Sensorless CC/CV Step-Down DC/DC Converter
• 32V Input Voltage Surge
• 30V Steady State Input Voltage
• Up to 3A Output Current
• Output Voltage up to 12V
• 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
• CC Accuracy
− Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR
• 2% Feedback Voltage Accuracy
• Up to 94% Efficiency
• 225kHz Switching Frequency Eases EMI Design
• Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin
• SOP-8EP Package
• USB Chargers
• LCD TV and Monitors
• Digital Video Recorders
• Set-Top Box
• Battery Chargers
• General-Purpose CC/CV Power Supplies

ACT4303 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. ACT4303 provides up to 3A output current at 225kHz 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 ACT4303 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.

Input 10V~30V

ACT4303

ISET GND COMP
22nF

L1 30µH

R2 52k

C1 47µF

R1 11.5k
2.2nF 10k

R3 8.2k

D1 SK34

C4 100µF

Innovative PowerTM

Output Voltage V

CC/CV Curve

VIN = 24V

VIN = 12V

Output Current A

Copyright 2011 Active-Semi, Inc.

ACT4303-001

Active-Semi
ORDERING INFORMATION

PART NUMBER OPERATION TEMPERATURE RANGE

ACT4303YH-T
-40°C to 85°C

PACKAGE

SOP-8EP

PINS

PACKING

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 2011 Active-Semi, Inc.

Active-Semi

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 34 -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.

Innovative PowerTM

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Datasheet ID: ACT4303YH-T 522413