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HV9918

Hysteretic, Buck, High Brightness LED Driver w/ High-Side Current Sensing

Status: In Production

Features:

  • Hysteretic control with high-side current sensing
  • Integrated 40V 1.0Ω MOSFET
  • >90% Efficiency
  • Wide input voltage range: 4.5 to 40V
  • ±5% LED current accuracy
  • Up to 2.0MHz switching frequency
  • Adjustable constant LED current
  • Analog or PWM control signal for PWM dimming
  • Over-temperature protection
  • -40ºC to +125ºC operating temperature range
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The HV9918 is a PWM controller IC designed to drive high brightness LEDs using a buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control with a high-side current sense resistor to set the constant output current up to 700mA. The device is well suited for applications requiring a wide input voltage range. The high-side current sensing and an integrated current-setting circuitry minimize the number of external components while delivering an accurate average output. Dedicated pulse-width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness levels. A hysteretic control method ensures excellent input supply rejection and fast response during load transients and PWM dimming. The HV9918 offers an analog-controlled PWM dimming feature that reduces the output current by applying an external DC voltage below the internal 2.0V threshold voltage from ADIM to GND. ADIM can also accept input from a resistor divider including a negative temperature coefficient (NTC) thermistor connected between ADIM and GND, or a positive temperature coefficient (PTC) thermistor connected between ADIM and VDD thus providing a PWM thermal-foldback feature that reduces the LED current when the temperature of the LED string exceeds a specified temperature point. Additional features include thermal-shutdown protection. The high switching frequency up to 2.0MHz permits the use of small inductors and capacitors, minimizing space and cost in the overall system. The HV9918 comes in a small 8-Lead DFN package and is ideal for industrial and general lighting applications.

Additional Features
  • Hysteretic control with high-side current sensing
  • Integrated 40V 1.0Ω MOSFET
  • >90% Efficiency
  • Wide input voltage range: 4.5 to 40V
  • ±5% LED current accuracy
  • Up to 2.0MHz switching frequency
  • Adjustable constant LED current
  • Analog or PWM control signal for PWM dimming
  • Over-temperature protection
  • -40ºC to +125ºC operating temperature range
Parametrics
Name
Value
Topology
Buck
+Vin min (V)
4.5
+Vin max (V)
40
Output Current
Integrated FET
Dimming
PWM
Package
DFN-8
Product Type
DC/DC
Type
High-side current sensing
Operating Iq (µA)
1.5
Switching Frequency
2MHz
ILED Accuracy
±5%
Θja (C/W)
60

Documents

Jump to:

Data Sheet

09/27/2010
452KB

User Guides

06/25/2014
831KB

Development Environment

  • Demo & Evaluation Boards
  • Application Examples
Demo & Evaluation Boards
HV9918DB1 Demo Board
HV9918DB1 Demo Board ( HV9918DB1 )

The HV9918DB1 demoboard is a high current LED driver designed to drive one or two LEDs at 700mA from a 9.0 - 16VDC input. The demoboard uses HV9918 hysteretic buck LED driver IC.  

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
HV9918K7-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.

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