MIC2196
400kHz SO-8 Boost Control IC
General Description
Micrel’s MIC2196 is a high efficiency PWM boost control
IC housed in a SO-8 package. The MIC2196 is optimized
for low input voltage applications. With its wide input
voltage range of 2.9V to 14V, the MIC2196 can be used to
efficiently boost voltages in 3.3V, 5V, and 12V systems, as
well as 1- or 2-cell Li Ion battery powered applications. Its
powerful 2Ω output driver allows the MIC2196 to drive
large external MOSFETs.
The MIC2196 is ideal for space-sensitive applications. The
device is housed in the space-saving SO-8 package,
whose low pin-count minimizes external components. Its
400kHz PWM operation allows a small inductor and small
output capacitors to be used. The MIC2196 can implement
all ceramic capacitor solutions.
Efficiencies over 90% are achievable over a wide range of
load conditions with the MIC2196’s PWM boost control
scheme. Its fixed frequency PWM architecture also makes
the
MIC2196
is
ideal
for
noise-sensitive
telecommunications applications.
MIC2196 features a low current shutdown mode of 1μA
and programmable undervoltage lockout.
The MIC2196 is available in an 8-pin SOIC package with a
junction temperature range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
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2.9V to 14V input voltage range
>90% efficiency
2Ω output driver
400kHz oscillator frequency
PWM current mode control
0.5μA micro power shutdown
Programmable UVLO
Front edge blanking
Cycle-by-cycle current limiting
Frequency foldback short-circuit protection
8-pin SOIC package
Applications
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Step-up conversion in telecom/datacom systems
SLIC power supplies
SEPIC power supplies
Low input voltage flyback and forward converters
Wireless modems
Cable modems
ADSL line cards
Base stations
1-and 2-cell Li Ion battery operated equipment
_________________________________________________________________________________________________________
Typical Application
V
IN
5V
47µF
16V
4.7µH
MIC2196BM
VIN OUTN
EN/
CS
UVLO
GND
VDD
10k
10nF
COMP
FB
Si4884
(x2)
B530
10k
1.15k
VOUT
12V, 3A
100
95
90
EFFICIENCY (%)
85
80
75
70
65
60
55
V
IN
= 5V
50
0 0.5 1 1.5 2 2.5 3 3.5 4
OUTPUT CURRENT (A)
MIC2196
5V to 12V Efficiency
120µF
20V
(x3)
1µF
Adjustable Output Boost Converter
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2008
M9999-092908
MICREL [ MICREL SEMICONDUCTOR ]
