LED Driver. HV9903 Datasheet

HV9903 Driver. Datasheet pdf. Equivalent

Part HV9903
Description White LED Driver
Feature HV9903 Initial Release White LED Driver Features ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ Power efficiency of up to .
Manufacture Supertex Inc
Datasheet
Download HV9903 Datasheet




HV9903
HV9903
Initial Release
White LED Driver
Features
Power efficiency of up to 85%
Drives up to 6 White LEDs
2.6V to 4.6V Supply
power stage can operate at 1.8V (see page 8)
Built-in Soft Start
DC and PWM Dimming Control
Built-in Open LED protection
Open LED indicator (via RSET)
1.2MHz Fixed Switching Frequency
500nA max leakage current when disabled
No leakage current path through LEDs when
disabled
Resistor-programmable LED Current
Small 6-lead MLP (3mm x 3mm) package
(similar to 6-pin SOT-23)
Applications
Color LCD Backlighting
Cell phones, smart phones
PDAs, pocket PCs
Organizers
Digital Cameras
MP3 Players
Description
The Supertex HV9903 is a fixed frequency DC-DC
boost converter designed for driving Light Emitting
Diodes (LEDs) with constant current where the light
intensity is proportional to the current through them.
The input supply voltage range into the device (VDD)
is 2.6 to 4.6V. Operation of the driver at lower
voltages is possible as long as a 2.6–4.6V low-
current supply is available for the HV9903. The
device uses a single inductor and a minimum
number of passive components. The device can be
enabled/disabled via the SHDN pin.
The HV9903 has an internal oscillator. The oscillator
frequency is at fixed frequency of 1.2MHz that allows
use of small value inductors. The LED current can
be adjusted from 5 to 40mA by an external resistor
connected between the RSET and the GND pins. The
amount of current though the LED can also be
adjusted via DC voltage or a pulse width modulated
(PWM) signal to the RSET pin.
Soft-start is implemented on-chip, minimizing inrush
current to only 30% over steady state current.
An open LED circuit detects an open LED condition,
disables the driver, and sets the RSET pin high. The
driver is re-enabled by asserting SHDN low, then
high. If the open LED condition persists, the driver
will again latch off.
Typical Application
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products
liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be
defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product
specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer
page on the Supertex website.



HV9903
Ordering Information
Device
HV9903
Package Option
MLP (3mm x 3mm)
HV9903K6*
Demo Kit
HV9903DB1
HHVV99990033
*Product supplied on 3000 piece carrier tape reels
Absolute Maximum Ratings
VDD
VSW, SW Voltage
VSHDN
IRset
VRset
Storage Temperature
Operating Temperature
6V
+35V
-0.5V to 6V
10mA
VDD + 0.5V
-65ºC to +150ºC
-40ºC to +85ºC
Recommended Operating Conditions
Symbol
VDD
ISW(pk)
TAMB
ILED
Parameter
Supply voltage
Peak switch current
Operating temperature
LED current
Min Typ Max
2.6 4.6
600
-40 85
5 40
Unit
V
mA
ºC
mA
Conditions
Specifications (unless otherwise specified: TA = 25ºC, VDD = 2.6V)
Symbol Parameter
Min Typ. Max Unit
OVP Over voltage protection
28 33 35
V
IDD
IDDQ
RSW
ISW(lim)
VRset
VLED
ILED
VDD supply current
Total leakage current when
disabled
(ISW(off) + IDD(off) + ILED(off))
Switch on resistance
Switch current limit
Rset pin voltage
LED pin voltage
LED pin current
1.6 mA
500 nA
0.6 1.0
900
100
180
5
12.5 15 17.5
17 20 23
mA
mV
mV
mA
25 30 36
33 38 45
TC ILED Tempco
0.02 mA/ºC
Conditions
VRset =0.2V
VSHDN =0V, RSET = 1.5K
VDD = 2.7V
RSET = 1.5K
RSET = 1.5K, VDD < VOUT
RSET = 4.53K
RSET = 1.5K
RSET = 1.13K
RSET = 750
RSET = 562
ILED = 15mA
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