Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes
product primary image

HV857

Low Noise, High Voltage EL Lamp Driver IC

Status: In Production

Features:

  • Patented audible noise reduction
  • Patented lamp aging compensation
  • 190 VPP output voltage for higher brightness
  • Patented output timing for high efficiency
  • Single cell lithium ion compatible
  • 150nA shutdown current
  • Wide input voltage range 1.8 to 5.0V
  • Separately adjustable lamp and converter frequencies
  • Output voltage regulation
  • Split supply capability
View More
Overview
Documents
Development Environment
Similar Devices
RoHS Information
Add To Cart

Device Overview

Summary

The HV857 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 square inches. The input supply voltage range is from 1.8 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/GND. The HV857 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 RELOsc pin and VDD pin. 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 VA and VB. 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 configured as an H bridge and are switching in opposite states to achieve ±95V across the EL lamp.

Additional Features
    • Patented audible noise reduction
    • Patented lamp aging compensation
    • 190 VPP output voltage for higher brightness
    • Patented output timing for high efficiency
    • Single cell lithium ion compatible
    • 150nA shutdown current
    • Wide input voltage range 1.8 to 5.0V
    • Separately adjustable lamp and converter frequencies
    • Output voltage regulation
    • Split supply capability
Parametrics
Name
Value
Type
Single Lamp Driver
Input Voltage Low (V)
1.8
Input Voltage High (V)
5
Nominal Output Voltage (V)
±95
Max Switch Resistance(Ω)
6.0
Output Regulation
Yes
Max Lamp Size per Device (in2)
5.0
Package
DFN-8, MSOP-8
Product Type
Single Lamp Drivers
Frequency (EL, Typical)
205Hz - 275Hz
Θja (C/W)
37, 171
VOUT
190

Documents

Jump to:

Data Sheets

06/24/2015
907KB

User Guides

06/24/2015
375KB

Development tools data is currently unavailable.

Similar Devices

Product
Price 5K
$1.55
$1.55
$1.38
$1.87
$1.18
$0.84
$1.27
$1.00
$0.92
$0.92
$0.92
$0.71
$0.71
$0.73
$0.81
$0.97
$0.85
$0.94
$0.89
$0.89
$1.28

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
HV857LMG-G
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
HV857MG-G
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
HV857LK7-G
0.020780
0.118788
8
WDFN
3x3x0.8mm
Matte Tin
e3
HV857K7-G
0.020780
0.118788
8
WDFN
3x3x0.8mm
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

Buy from the Microchip Store

Grid
View
Table
View
Filter:
Apply
Clear
Only show products with samples
Product
Leads
Package Type
Temp Range
Packing Media
5K Pricing
Buy