MP24833 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – 3A, 55V White LED Driver

The Future of Analog IC Technology
MP24833
3A, 55V
White LED Driver
DESCRIPTION
The MP24833 is a 55V, 3A, white LED driver
suitable for step-down, inverting step-up/down
and step-up applications. It achieves 3A output
current over a wide input supply range with
excellent load and line regulation. Current mode
operation provides fast transient response and
eases loop stabilization. Fault condition
protection includes thermal shutdown,
cycle-by-cycle peak current limiting, open strings
protection and output short circuit protection.
The MP24833 incorporates both DC and PWM
dimming onto a single control pin. The separate
input reference ground pin allows for direct
enable and/or dimming control for a positive to
negative power conversion.
The MP24833 requires a minimal number of
readily-available standard external components
and is available in an SOIC8E package.
FEATURES
• 3A Maximum Output Current
• Unique Step-Up/Down Operation (Buck-
Boost Mode)
• Wide 4.5V-to-55V Operating Input Range
for Step-Down Applications (Buck Mode)
• 0.19Ω Internal Power MOSFET Switch
• Fixed 200kHz Switching Frequency
• Analog and PWM Dimming
• 0.198V Reference Voltage
• 6μA Shutdown Mode
• No Minimum Number of LEDs Required
• Stable with Low ESR Output Ceramic
Capacitors
• Cycle-by-Cycle Over-Current Protection
• Thermal Shutdown Protection
• Open Strings Protection
• Output Short-Circuit Protection
• Available in an SOIC8E Package
APPLICATIONS
• General LED Illumination
• LCD Backlight Panels
• Notebook Computers
• Automotive Internal Lighting
• Portable Multimedia Players
• Portable GPS Devices
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of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.5V<VIN<55V C_IN
EN/DIM
ON
OFF
DC or PWM Input
1 _VDD
3
OVP
7
BST
5
EN/DIM
8
SW
6 _INGND
VSS
2
4
FB
CBST
L
D
C_o
R_FB
MP24833 Rev. 1.0
www.MonolithicPower.com
1
05/05/2010
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