MIC2196_08 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 400kHz SO-8 Boost Control IC

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
• 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
• 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
1µF
10nF
Si4884
4.7µH _(x2)
MIC2196BM
VIN OUTN
EN/
CS
UVLO
VDD GND
10k _{COMP FB}
B530
10k
1.15k
VOUT
12V, 3A
120µF
20V
(x3)
Adjustable Output Boost Converter
MIC2196
5V to 12V Efficiency
100
95
90
85
80
75
70
65
60
55
V_IN = 5V
500 _{0.5 1 1.5 2 2.5 3 3.5 4}
OUTPUT CURRENT (A)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 2008
M9999-092908