EA6359US

EA6359US Datasheet

Part	Datasheet
EA6359US	EA6359US (pdf)

Related Parts	Information
ACT6359US-T	ACT6359US-T

PDF Datasheet Preview
High-Efficiency, 40V Step-Up WLED Bias Supplies • High-Efficiency DC/DC WLED Bias Supply • Internal 40V, Power MOSFET • Up to 10 WLEDs per String • 500mA Peak Current • Supports Analog and PWM LED Dimming • Integrated Over-Voltage Protection OVP • Thermal Shutdown • Cycle-by-Cycle Over Current Protection • Tiny SOT23-6 Package • TFT LCD Displays • Smart Phones • Portable Media Players • GPS/Personal Navigation Devices The ACT6359 step-up DC/DC converter drives white LEDs with an externally programmable constant current. This device features an integrated, 40V power MOSFET that is capable of driving up to ten white LEDs in series, providing inherent current matching for uniform brightness. WLED brightness adjustment is easily achieved via simple external circuitry, which accepts either a PWM or an analog dimming control signal. The ACT6359 features a variety of protection circuits, including integrated over voltage protection OVP , cycle-by-cycle current limiting, and thermal shutdown protection circuitry. The ACT6359 has a 500mA current limit, and is available in a small 6-pin SOT23-6 package. SIMPLIFIED APPLICATION CIRCUIT ON OFF Up to D1 10 WLEDs ROV2 ACT6359 OV ROV1 VOUT COUT Innovative PowerTM Copyright 2013 Active-Semi, Inc. ORDERING INFORMATION ACT6359US-T CURRENT LIMIT 0.5A TEMPERATURE RANGE -40°C to 85°C PACKAGE PINS PACKAGING SOT23-6 6 TAPE & REEL TOP MARK WJFR PIN CONFIGURATION G 2 ACT6359 5 EN SOT23-6 PIN DESCRIPTIONS PIN NAME SW Switch Output. Connect this pin to the inductor and the Schottky diode. Ground Over Voltage Protection Input. The IC is automatically disabled when the voltage at this pin OV exceeds 1.21V. Connect OV to the center point of a resistive voltage divider connected across the LED string. Feedback Input. Connect this pin to the cathode of the bottom LED, and a current feedback resistor between this pin and G to set the LED bias current. Enable Control. Drive to a logic high to enable the device. Connect to a logic low to disable the device. EN should not be left floating connect EN to IN when unused. Supply Input Innovative PowerTM Copyright 2013 Active-Semi, Inc. ABSOLUTE MAXIMUM RATINGSc PARAMETER SW to G IN, EN to G FB, OV to G Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec VALUE to 42 to 6 to VIN + Internally Limited 200 -40 to 150 -55 to 150 300 UNIT °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 2013 Active-Semi, Inc. ELECTRICAL CHARACTERISTICS VIN = VEN = 3.3V, TA = 25°C, unless otherwise specified. PARAMETER Power Switch Voltage Rating Input Voltage Under Voltage Lockout Threshold Under Voltage Lockout Hysteresis

PDF Datasheet Preview

High-Efficiency, 40V Step-Up WLED Bias Supplies
• High-Efficiency DC/DC WLED Bias Supply
• Internal 40V, Power MOSFET
• Up to 10 WLEDs per String
• 500mA Peak Current
• Supports Analog and PWM LED Dimming
• Integrated Over-Voltage Protection OVP
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Tiny SOT23-6 Package
• TFT LCD Displays
• Smart Phones
• Portable Media Players
• GPS/Personal Navigation Devices

The ACT6359 step-up DC/DC converter drives white LEDs with an externally programmable constant current. This device features an integrated, 40V power MOSFET that is capable of driving up to ten white LEDs in series, providing inherent current matching for uniform brightness. WLED brightness adjustment is easily achieved via simple external circuitry, which accepts either a PWM or an analog dimming control signal.

The ACT6359 features a variety of protection circuits, including integrated over voltage protection OVP , cycle-by-cycle current limiting, and thermal shutdown protection circuitry.

The ACT6359 has a 500mA current limit, and is available in a small 6-pin SOT23-6 package.

SIMPLIFIED APPLICATION CIRCUIT

ON OFF

Up to D1 10 WLEDs

ROV2

ACT6359 OV

ROV1

VOUT

COUT

Innovative PowerTM

Copyright 2013 Active-Semi, Inc.
ORDERING INFORMATION

ACT6359US-T

CURRENT LIMIT
0.5A

TEMPERATURE RANGE
-40°C to 85°C

PACKAGE PINS PACKAGING

SOT23-6
6 TAPE & REEL

TOP MARK

WJFR

PIN CONFIGURATION

G 2 ACT6359 5 EN

SOT23-6

PIN DESCRIPTIONS

PIN NAME

SW Switch Output. Connect this pin to the inductor and the Schottky diode.

Ground

Over Voltage Protection Input. The IC is automatically disabled when the voltage at this pin

OV exceeds 1.21V. Connect OV to the center point of a resistive voltage divider connected across
the LED string.

Feedback Input. Connect this pin to the cathode of the bottom LED, and a current feedback resistor between this pin and G to set the LED bias current.

Enable Control. Drive to a logic high to enable the device. Connect to a logic low to disable the device. EN should not be left floating connect EN to IN when unused.

Supply Input

Innovative PowerTM

Copyright 2013 Active-Semi, Inc.

ABSOLUTE MAXIMUM RATINGSc

PARAMETER

SW to G IN, EN to G FB, OV to G Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec

VALUE
to 42 to 6 to VIN + Internally Limited
200 -40 to 150 -55 to 150 300

UNIT
°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 2013 Active-Semi, Inc.

ELECTRICAL CHARACTERISTICS

VIN = VEN = 3.3V, TA = 25°C, unless otherwise specified.

PARAMETER

Power Switch Voltage Rating Input Voltage Under Voltage Lockout Threshold Under Voltage Lockout Hysteresis

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Datasheet ID: EA6359US 522520