MIC2292/93
High-Frequency PWM White LED Drivers
with Internal Schottky Diode and OVP
General Description Features
The MIC2292 and MIC2293 are high frequency, Pulse
2.5V to 10V input voltage
Width Modulator (PWM) boost regulators optimized for
Output voltage up to 34V
constant-current, white LED driver applications. Because
Internal Schottky diode
of their constant PWM switching frequencies of 1.6MHz
1.6MHz PWM operation (MIC2292)
and 2MHz, respectively, the MIC2292/93 can use the
smallest external components, allowing designers to avoid 2.0MHz PWM operation (MIC2293)
sensitive IF bands in their RF applications.
Stable with ceramic capacitors
The products feature an internal Schottky diode and two
15V and 34V output overvoltage protection options
levels of output overvoltage protection allowing a small
500mA switch current rating
size and efficient DC/DC solution that requires only four
95mV feedback voltage
external components.
<1% line and load regulation
The 2.5V to 10V input voltage range of MIC2292/3 allows
<1A shutdown current
direct operation from 1- and 2-cell Li Ion as well as 3- to 4-
cell NiCad/NiMH/Alkaline batteries. The MIC2292/3
Over-temperature protection
products are available in a small size 2mm 2mm 8-pin
UVLO
MLF package and have a junction temperature range of
8-pin (2mm 2mm) MLF package
40C to +125C.
40C to +125C junction temperature range
Data sheets and support documentation can be found on
Applications
Micrels web site at: www.micrel.com.
White LED driver for backlighting:
Cell phones
PDAs
GPS systems
Digital cameras
MP3 players
IP phones
Constant-current power supplies
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Typical Application
1.6MHz PWM White LED Driver with 15V OVP 2MHz PWM White LED Driver with 15V OVP
MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2292/93
Ordering Information
Marking Overvoltage Junction Temperature Lead
Part Number Frequency Package
Code Protection Range Finish
MIC2292-15BML SWA 15V 1.6MHz 40 to +125C 8-Pin MLF Standard
MIC2292-15YML 15V 1.6MHz 40 to +125C 8-Pin MLF Pb-Free
SWA
MIC2292-34BML SWC 34V 1.6MHz 40 to +125C 8-Pin MLF Standard
MIC2292-34YML 34V 1.6MHz 40 to +125C 8-Pin MLF Pb-Free
SWC
MIC2293-15BML SZA 15V 2MHz 40 to +125C 8-Pin MLF Standard
MIC2293-15YML 15V 2MHz 40 to +125C 8-Pin MLF Pb-Free
SZA
MIC2293-34BML SZC 34V 2MHz 40 to +125C 8-Pin MLF Standard
MIC2293-34YML 34V 2MHz 40 to +125C 8-Pin MLF Pb-Free
SZC
Pin Configuration
8-Pin MLF (ML)
(Top View)
Fused Lead Frame
Pin Description
Pin Number Pin Name Pin Function
1 OUT Output Pin and Overvoltage Protection (Output). Connect to the output capacitor and LEDs.
2 VIN Supply (Input). Input voltage.
3 EN Enable (Input). Logic HIGH enables regulator and logic LOW shuts down regulator.
5 NC No Connect. No internal connection to die.
Feedback (Input). Output voltage sense node. Connect the cathode of the LED to this pin. A
6 FB
resistor from this pin to Ground (GND) sets the LED current.
7 SW Switch Node (Input). Internal power transistor collector.
4, 8 GND Ground (Return). Ground.
EP GND Ground (Return). Exposed backside pad (ePad).
M9999-040212-B
April 2012 2