EA6357NH

EA6357NH Datasheet


Part Datasheet
EA6357NH EA6357NH EA6357NH (pdf)
Related Parts Information
ACT6357NH-T ACT6357NH-T ACT6357NH-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
• Two Peak Current Options:
− ACT6357 0.5A − ACT6358 1A
• Supports Analog and PWM LED Dimming
• Integrated Over-Voltage Protection OVP
• Programmable Soft-Start Function
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Tiny TDFN33-8 Package
• TFT LCD Displays
• Smart Phones
• Portable Media Players
• GPS/Personal Navigation Devices

The ACT6357 and ACT6358 step-up DC/DC converters drive white LEDs with an externally programmable constant current. These devices feature integrated, 40V power MOSFETs that are capable of driving up to ten white LEDs in series, providing inherent current matching for uniform brightness. WLED brightness adjustment is easily achieved via a dual-function pin, which accepts either a PWM or an analog dimming control signal.

The ACT6357 and ACT6358 feature a variety of protection circuits, including integrated over voltage protection OVP , programmable soft-start, cycleby-cycle current limiting, and thermal shutdown protection circuitry.

The ACT6357 has 500mA current limit, while the ACT6358 has 1A current limit. Both parts are available in a small 3mm x 3mm 8-pin TDFN33-8.

SIMPLIFIED APPLICATION CIRCUIT

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.
ORDERING INFORMATION

ACT6357NH-T ACT6358NH-T

CURRENT LIMIT
0.5A

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

PACKAGE

TDFN33-8 TDFN33-8

PINS

PIN CONFIGURATION

PACKAGING

TAPE & REEL TAPE & REEL

G1 IN 2 EN 3 BC 4

ACT6357 ACT6358
8 SW 7 OV 6 SS 5 FB

TDFN33-8

PIN DESCRIPTIONS

PIN NAME

G Ground

IN Supply Input

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.

Brightness Control. Multifunction pin accepts either a PWM or analog control signal. When using a

PWM control signal, the best results are achieved when the PWM frequency is in the 100Hz to 10kHz range and when the PWM high voltage is 1.8V or higher. When using an analog control sig-
nal, the best results are achieved when the control voltage is in the 0V to 1.8V range.

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.

Soft Start Control Input. Connect a capacitor from this pin to G to program the soft start duration. SS is internally discharged when IC the is disabled.

Over Voltage Protection Input. The IC is automatically disabled when the voltage at this pin exceeds 1.21V. Connect OV to the center point of a resistive voltage divider connected across the LED string.

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

EP Exposed Pad. Connect to ground.

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.

ABSOLUTE MAXIMUM RATINGSc

PARAMETER

SW to G IN, EN to G FB, OV, BC, SS 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
-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.
More datasheets: 88256513 | DCDM-51P6E5-18.0S | DCDM-21S6E5-18.0S | DM74AS640N | DM74AS640WMX | B39162B7840C710S9 | B39162B7840C710A3 | B39162B7840C710 | B39162B7840C710S3 | ACT6357NH-T


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Datasheet ID: EA6357NH 522512