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Ordering number : ENA1625B
LV8498CT
Bi-CMOS IC
For VCMs
http://onsemi.com
Constant-current Driver IC
Overview
The LV8498CT is a constant current driver IC for voice coil motors that supports I 2 C control integrating a
digital/analog converter (DAC). It uses an ultraminiature WLP package and includes a current detection resistor for
constant current control, which makes the IC ideal for miniaturization of camera modules intended for use in
camera-equipped mobile phones. The output transistor has a low on-resistance of 1 Ω and the resistance of the built-in
current detection resistor is 1 Ω , which minimizes the voltage loss and helps withstand voltage drop in VCC. The
function is incorporated, which, by changing the current in a stepped pattern while taking time at rise and fall of the
output current, provides the current a slope, improving the converging stability of the voice coil motor (current slope
function).
Functions
? Constant current driver for voice coil motors. ? Constant current control enabled by DAC (10 bits).
? I 2 C bus control supported. ? Wide operating voltage range (2.2 to 5.0V).
? Built-in current detection resistor. ? 6-pin WLP package used (1.27 × 0.87 × 0.25mm).
? Built-in voltage drop protection circuit (VCC = 2V output off).
? Built-in thermal protection circuit.
? Low output block total-resistance of 2 Ω helps withstand voltage drop in VCC. (Current detection resistance + output
transistor on-resistance).
? Built-in VCM overshoot preventive function (current slope function).
Specifications
Absolute Maximum Ratings at Ta = 25 ° C
Parameter
Maximum supply voltage
Output voltage
Input voltage
GND pin source current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
VOUT max
VIN max
IGND
Pd max
Topr
Tstg
Conditions
SCL, SDA, ENA
With specified substrate *
Ratings
5.5
VCC + 0.5
5.5
200
350
-30 to +85
-40 to +150
Unit
V
V
V
mA
mW
° C
° C
* Specified substrate : 40mm × 40mm × 1.6mm, Single layer glass epoxy substrate
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
June, 2013
53011 SY/52511 SY/31710 SY 20091119-S00001 No.A1625-1/8
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