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Micrel Semiconductor
Micrel Semiconductor

MIC2291-15BML Datasheet Preview

MIC2291-15BML Datasheet

1.2A PWM Boost Regulator Photo Flash LED Driver

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MIC2291-15BML pdf
MIC2291
MIC2291
1.2A PWM Boost Regulator
Photo Flash LED Driver
Micrel
General Description
The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM),
boost-switching regulator that is optimized for high-current,
white LED photo flash applications. With a guaranteed switch
current of 1.2A, the MIC2291 easily drives a string of 3 white
LEDs in series at 100mA, ensuring a high level of brightness
and eliminating several ballast resistors.
The MIC2291 implements a constant frequency, 1.2MHz
PWM control scheme. The high frequency PWM operation
saves board space by reducing external component sizes.
The added benefit of the constant frequency PWM scheme,
in contrast to variable frequency topologies, is much lower
noise and input ripple injected back to the battery source.
To optimize efficiency, the feedback voltage is set to only
95mV. This reduces the power dissipation in the current set
resistor, and allows the lowest total output voltage, hence
minimal current draw from the battery.
The MIC2291 is available with 2 levels of over-voltage
protection, 15V, and 34V. This allows designers to choose
the smallest possible external components with the appropri-
ate voltage ratings for their applications.
The MIC2291 is available in low-profile, Thin SOT23 5-lead
and 8-lead 2mm × 2mm MLF™ package options. The MIC2291
has a junction temperature range of –40°C to +125°C.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
2.5V to 10V input voltage
Output voltage up to 34V
1.2A switch current
1.2MHz PWM operation
95mV feedback voltage
Overvoltage protection (OVP)
Options for 15V and 34V
Stable with ceramic capacitors
<1% line and load regulation
1µA shutdown current
Over temperature protection
UVLO
Low-profile Thin SOT23-5 package option
2mm × 2mm MLFpackage option
• –40°C to +125°C junction temperature range
Applications
Photo Flash LED driver
Cell phones
PDAs
GPS systems
Digital cameras
IP phones
LED flashlights
Typical Application
10µH
100mA
1-Cell
Li Ion
3V to 4.2V
MIC2291BD5
5
VIN
1
SW
1µF
4 EN
FB 3
95mV
GND
2
0.95
0.22µF
ceramic
Thin SOT23 Flash LED Driver
1-Cell
Li Ion
3V to 4.2V
10µH
100mA
MIC2291-15BML
VIN SW
1µF EN OVP
FB
GND
95mV
0.95
0.22µF
2mm × 2mm Flash LED Driver with Output OVP
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
PowerPAK is a trademark of Siliconix, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August, 2004
1
M9999-081104



Micrel Semiconductor
Micrel Semiconductor

MIC2291-15BML Datasheet Preview

MIC2291-15BML Datasheet

1.2A PWM Boost Regulator Photo Flash LED Driver

No Preview Available !

MIC2291-15BML pdf
MIC2291
Ordering Information
Part Number
MIC2291BD5
MIC2291YD5
MIC2291-15BML
MIC2291-15YML
MIC2291-34BML
MIC2291-34YML
Marking
Code
SSAA
SSAA
STA
STA
STC
STC
Overvoltage
Protection
15V
15V
34V
34V
Junction
Temp. Range
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
40°C to 125°C
Package
Lead Finish
Thin SOT-23-5
Standard
Thin SOT-23-5
Pb-Free
2mm × 2mm MLFStandard
2mm × 2mm MLFPb-Free
2mm × 2mm MLFStandard
2mm × 2mm MLFPb-Free
Micrel
Pin Configuration
FB GND SW
321
45
EN VIN
TSOT-23-5 (BD5)
OVP 1
VIN 2
EN 3
AGND 4
8 PGND
7 SW
6 FB
EP 5 NC
8-Pin MLF(BML)
(Top View)
Fused Lead Frame
Pin Description
Pin Number Pin Number
TSOT-23-5 2mm × 2mm MLFPin Name
17
SW
2 GND
36
FB
43
EN
52
1
VIN
OVP
4
8
5
EP
AGND
PGND
NC
GND
Pin Function
Switch node (Output): Internal power BIPOLAR collector.
Ground (Return): Ground.
Feedback (Input): Output voltage sense node. Connect the cathode of the
LED to this pin. Connect current set resistor from this pin to ground.
Enable (Input): Logic high (1.5V) enables regulator. Logic low (0.4V) shuts
down regulator.
Supply (Input): Input Voltage.
Overvoltage protection (Input): Connect to the output to clamp the maximum
output voltage.
Analog ground. Internally connected to ground.
Power ground.
No connect (no internal connection to die).
Ground (Return): Exposed backside pad.
M9999-081104
2 August, 2004


Part Number MIC2291-15BML
Description 1.2A PWM Boost Regulator Photo Flash LED Driver
Maker Micrel Semiconductor
Total Page 9 Pages
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