EA4050YH

EA4050YH Datasheet

Part	Datasheet
EA4050YH	EA4050YH (pdf)

Related Parts	Information
ACT4050YH-T	ACT4050YH-T

PDF Datasheet Preview
Active-Semi Wide Input 3.5A Step Down Converter • 3.5A Output Current • Up to 96% Efficiency • 4.5V to 15V Input Range • 12µA Shutdown Supply Current • 400kHz Switching Frequency • Adjustable Output Voltage From 0.817V • Cycle-by-Cycle Current Limit Protection • Thermal Shutdown Protection • Frequency Fold-Back at Short Circuit • Stability with Wide Range of Capacitors, Including Low ESR Ceramic Capacitors • SOP-8/EP Exposed Pad Package • Digital TV • Portable DVDs • Car-Powered or Battery-Powered Equipments • Set-Top Boxes • Telecom Power Supplies • Consumer Electronics The ACT4050 is a current-mode step-down DC/DC converter that provides up to 3.5A of output current at 400kHz switching frequency. The device utilizes Active-Semi’s proprietary high voltage process for operation with input voltages up to 15V. The ACT4050 provides fast transient response and eases loop stabilization while providing excellent line and load regulation. This device features a very low ON-resistance power MOSFET which provides peak operating efficiency up to In shutdown mode, the ACT4050 consumes only 12uA of supply current. This device also integrates protection features including cycle-by-cycle current limit, thermal shutdown and frequency fold-back at short circuit. The ACT4050 is available in a SOP-8/EP Exposed Pad package and requires very few external devices for operation. ACT4050-001 TYPICAL APPLICATION CIRCUIT Efficiency % Efficiency vs. Load Current 100 VIN = 7V 90 VIN = 12V VOUT = 5V 0 500 1000 1500 2000 2500 3000 3500 Load Current mA Innovative PowerTM Copyright 2011 Active-Semi, Inc. Active-Semi ORDERING INFORMATION PART NUMBER ACT4050YH-T TEMPERATURE RANGE -40°C to 85°C -40°C to 85°C PIN CONFIGURATION PACKAGE SOP-8/EP SOP-8/EP PINS 8 PACKING TUBE TAPE & REEL SOP-8/EP PIN DESCRIPTIONS NAME Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 10nF capacitor between BS and SW. Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in the Application Information section. Switch Output. Connect this pin to the switching end of the inductor. Ground. Feedback Input. The voltage at this pin is regulated to 0.817V. Connect to the resistor divider between output and ground to set output voltage. COMP Compensation Pin. See Stability Compensation in the Application Information section. Enable Input. When higher than 1.3V, this pin turns the IC on. When lower than 0.9V, this pin turns the IC off. Output voltage is discharged when the IC is off. When left unconnected, EN is pulled up to 4.5V typical with a 2µA pull-up current. Not Connected. Exposed Pad shown as dashed box. The exposed thermal pad should be connected to board ground plane and pin The ground plane should include a large exposed copper pad under the package for thermal dissipation see package outline . The leads and exposed pad should be flush with the board, without offset from the board surface. Innovative PowerTM Copyright 2011 Active-Semi, Inc. Active-Semi ABSOLUTE MAXIMUM RATINGSc PARAMETER IN Supply Voltage SW Voltage BS Voltage EN, FB Voltage Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec VALUE to 15 -1 to VIN + 1 VSW - to VSW + 8 to 6 Internally Limited 46 -40 to 150 -55 to 150 300 UNIT V A °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. ELECTRICAL CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise specified. PARAMETER TEST CONDITIONS Input Voltage Feedback Voltage High-Side Switch On Resistance Low-Side Switch On Resistance SW Leakage High-Side Switch Peak Current Limit VIN VFB RONH RONL ILIM

PDF Datasheet Preview

Active-Semi

Wide Input 3.5A Step Down Converter
• 3.5A Output Current
• Up to 96% Efficiency
• 4.5V to 15V Input Range
• 12µA Shutdown Supply Current
• 400kHz Switching Frequency
• Adjustable Output Voltage From 0.817V
• Cycle-by-Cycle Current Limit Protection
• Thermal Shutdown Protection
• Frequency Fold-Back at Short Circuit
• Stability with Wide Range of Capacitors,

Including Low ESR Ceramic Capacitors
• SOP-8/EP Exposed Pad Package
• Digital TV
• Portable DVDs
• Car-Powered or Battery-Powered Equipments
• Set-Top Boxes
• Telecom Power Supplies
• Consumer Electronics

The ACT4050 is a current-mode step-down DC/DC converter that provides up to 3.5A of output current at 400kHz switching frequency. The device utilizes Active-Semi’s proprietary high voltage process for operation with input voltages up to 15V.

The ACT4050 provides fast transient response and eases loop stabilization while providing excellent line and load regulation. This device features a very low ON-resistance power MOSFET which provides peak operating efficiency up to In shutdown mode, the ACT4050 consumes only 12uA of supply current.

This device also integrates protection features including cycle-by-cycle current limit, thermal shutdown and frequency fold-back at short circuit.

The ACT4050 is available in a SOP-8/EP Exposed Pad package and requires very few external devices for operation.

ACT4050-001

TYPICAL APPLICATION CIRCUIT

Efficiency %

Efficiency vs. Load Current
100 VIN = 7V
90 VIN = 12V

VOUT = 5V
0 500 1000 1500 2000 2500 3000 3500

Load Current mA

Innovative PowerTM

Copyright 2011 Active-Semi, Inc.

Active-Semi
ORDERING INFORMATION

PART NUMBER ACT4050YH-T

TEMPERATURE RANGE -40°C to 85°C -40°C to 85°C

PIN CONFIGURATION

PACKAGE SOP-8/EP SOP-8/EP

PINS 8

PACKING TUBE

TAPE & REEL

SOP-8/EP

PIN DESCRIPTIONS

NAME

Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 10nF capacitor between BS and SW.

Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in the Application Information section.

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

Ground.

Feedback Input. The voltage at this pin is regulated to 0.817V. Connect to the resistor divider between output and ground to set output voltage.

COMP Compensation Pin. See Stability Compensation in the Application Information section.

Enable Input. When higher than 1.3V, this pin turns the IC on. When lower than 0.9V, this
pin turns the IC off. Output voltage is discharged when the IC is off. When left
unconnected, EN is pulled up to 4.5V typical with a 2µA pull-up current.

Not Connected.

Exposed Pad shown as dashed box. The exposed thermal pad should be connected to
board ground plane and pin The ground plane should include a large exposed copper pad under the package for thermal dissipation see package outline . The leads and
exposed pad should be flush with the board, without offset from the board surface.

Innovative PowerTM

Copyright 2011 Active-Semi, Inc.

Active-Semi

ABSOLUTE MAXIMUM RATINGSc

PARAMETER IN Supply Voltage SW Voltage BS Voltage EN, FB Voltage Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec

VALUE to 15 -1 to VIN + 1 VSW - to VSW + 8 to 6 Internally Limited
46 -40 to 150 -55 to 150 300

UNIT V A
°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.

ELECTRICAL CHARACTERISTICS

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

PARAMETER

TEST CONDITIONS

Input Voltage Feedback Voltage High-Side Switch On Resistance Low-Side Switch On Resistance SW Leakage High-Side Switch Peak Current Limit

VIN VFB RONH RONL

ILIM

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Datasheet ID: EA4050YH 522375