MIC2295_05 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – High Power Density 1.2A Boost Regulator

MIC2295
High Power Density 1.2A
Boost Regulator
General Description
The MIC2295 is a 1.2Mhz, PWM dc/dc boost switching
regulator available in low profile Thin SOT23 and 2mm x
2mm MLF™ package options. High power density is
achieved with the MIC2295’s internal 34V / 1.2A switch,
allowing it to power large loads in a tiny footprint.
The MIC2295 implements constant frequency 1.2MHz
PWM current mode control. The MIC2295 offers internal
compensation that offers excellent transient response and
output regulation performance. The high frequency
operation saves board space by allowing small, low-profile
external components. The fixed frequency PWM scheme
also reduces spurious switching noise and ripple to the
input power source.
The MIC2295 is available in a low-profile Thin SOT23 5-
lead package and a 2mm x2mm 8-lead MLF™ leadless
package. The 2mm x 2mm MLF™ package option has an
output over-voltage protection feature.
The MIC2295 has an operating junction temperature range
of –40°C to +125°C
Features
• 2.5V to 10V input voltage range
• Output voltage adjustable to 34V
• 1.2A switch current
• 1.2MHz PWM operation
• Stable with small size ceramic capacitors
• High efficiency
• Low input and output ripple
• <1µA shutdown current
• UVLO
• Output over-voltage protection (MIC2295BML)
• Over temperature shutdown
• Thin SOT23-5 package option
• 2mm x 2mm leadless 8-lead MLF™ package option
• –40^oC to +125^oC junction temperature range
Applications
• Organic EL power supplies
• 3.3V to 5V/500mA conversion
• TFT-LCD bias supplies
• Flash LED drivers
• Positive and negative output regulators
• SEPIC converters
• Positive to negative Cuk converters
• 12V supply for DSL applications
• Multi-output dc/dc converters
V_IN
1-Cell
Li Ion
3V to 4.2V
C1
2.2µF
10µH
V_OUT
15V/100mA
MIC2295BML
VIN
SW
OVP
EN
FB
AGND PGND
R1
49.9k
R2
4.53K
2.2µF
V_IN
1-Cell
Li Ion
C1
2.2µF
L1
10µH
MIC2295 BD5
VIN SW
EN
FB
GND
V_OUT
5V/500mA
R1
10k
10µF
R2
3.3k
MLF and MicroLeadFrame is a trademark of Amkor Technology
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 2005
M9999-042605
[phone]