Microchip HV857L Manual

Microchip Ikke kategoriseret HV857L

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Side 1/8

Supertex inc.

www.supertex.com

Doc.# DSFP-HV857L

A062013

HV857L

Features

►Audible noise reduction

►190 VPP output voltage for higher brightness

►Single cell lithium ion compatible

►150nA shutdown current

►Wide input voltage range 1.8V to 5.0V

►Separately adjustable lamp and converter

frequencies

►Output voltage regulation

►Split supply capability

►Available in 8-Lead DFN and 8-Lead MSOP-

packages

Applications

►Mobile cellular phones

►Keypad backlighting

►LCD backlighting

►PDAs

►Handheld wireless communication products

►Global Positioning Systems (GPS)

General Description

The Supertex HV857L is a low noise, high voltage driver designed

for driving Electroluminescent (EL) lamps of up to ve square

inches. It is the low noise version of the EL lamp driver HV857. The

input supply voltage range is from 1.8V to 5.0V. The device uses

a single inductor and a minimum number of passive components.

The nominal regulated output voltage that is applied to the EL

lamp is ±95V. The chip can be enabled/disabled by connecting the

resistor on RSW-Osc to VDD/ground.

The HV857L has two internal oscillators, a switching MOSFET,

and a high voltage EL lamp driver. The frequency for the switching

MOSFET is set by an external resistor connected between the RSW-

Osc pin and the supply pin, VDD. The EL lamp driver frequency

is set by an external resistor connected between the REL-Osc

and VDD pins. An external inductor is connected between the LX

and VDD pins, or VIN for split supply applications. A 0.003-0.1µF

capacitor is connected between CS and ground. The EL lamp is

connected between the VA and VB pins.

The switching MOSFET charges the external inductor and

discharges it into the capacitor at CS. The voltage at CS will start

to increase. Once the voltage at CS reaches a nominal value of

95V, the switching MOSFET is turned OFF to conserve power.

The outputs VA and VB are congured as an H bridge, and are

switching in opposite states to achieve ±95V across the EL lamp.

Typical Application Circuit

Low Noise, High Voltage

EL Lamp Driver IC

VDD CDD

EL Lamp

_ CS

VIN

CIN

Enable Signal

ON = VDD

OFF = 0

RSW

REL

HV857L

VDD

RSW-Osc

REL-Osc

GND

Supertex inc.

www.supertex.com

Doc.# DSFP-HV857L

A062013

HV857L

Absolute Maximum Ratings

Parameter Value

Supply voltage, VDD -0.5V to 6.5V

Operating temperature -40°C to +85°C

Storage temperature -65°C to +150°C

8-Lead DFN power dissipation 1.6W

8-Lead MSOP power dissipation 300mW

Output voltage, VCS -0.5 to +120V

Absolute Maximum Ratings are those values beyond which damage to

the device may occur. Functional operation under these conditions is not

implied. Continuous operation of the device at the absolute rating level

may affect device reliability. All voltages are referenced to device ground.

Sym Parameter Min Max Units ConditionsTyp

VDD Supply voltage 1.8 - 5.0 V ---

fEL Operating drive frequency - - 1 kHz ---

TAOperating temperature -40 - +85 OC ---

Recommended Operating Conditions

Product Marking

857L

Y W L L

Y = Last Digit of Year Sealed

W = Code for Week Sealed

L = Lot Number

= “Green” Packaging

L = Lot Number

YY = Year Sealed

WW = Week Sealed

= “Green” Packaging

857L

LLLL

YYWW

Top Marking

Bottom Marking

8-Lead DFN

8-Lead MSOP

Pin Congurations

Package may or may not include the following marks: Si or

8-Lead MSOP

(top view)

Pads are at the bottom of the package.

Exposed center pad is at ground potential.

8-Lead DFN

(top view)

VDD

RSW-Osc

REL-Osc

GND

VDD

RSW-Osc

REL-Osc

GND

Typical Thermal Resistance

Package θja

8-Lead DFN 37OC/W

8-Lead MSOP 171OC/W

Mounted on FR4 board, 25mm x 25mm x 1.57mm

Ordering Information

Part Number Package Packing

HV857LK7-G 8-Lead DFN 3000/Reel

HV857LMG-G 8-Lead MSOP 2500/Reel

-G denotes a lead (Pb)-free / RoHS compliant package

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	HV857L

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