MIC2186 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – Low Voltage PWM Control IC

MIC2186
MIC2186
Low Voltage PWM Control IC
Final Information
Micrel
General Description
Micrel’s MIC2186 is a high efficiency boost PWM control IC.
With its wide input voltage range of 2.9V to 14V, the MIC2186
can be used to efficiently boost voltages in 1- or 2-cell Li Ion
battery powered applications, as well as to boost voltages in
fixed 3.3V, 5V, or 12V systems. Its powerful 1.6Ω output
driver allows the MIC2186 to supply large output currents with
the selection of proper external MOSFETs.
The MIC2186 can be configured to operate at 100kHz,
200kHz, or 400kHz. With it’s fixed frequency PWM architec-
ture, and easily synchronized drive, the MIC2186 is ideal for
noise-sensitive telecommunications applications.
MIC2186 also features a low current shutdown mode of
0.5µA and programmable undervoltage lockout. A manually
selectable SKIP Mode allows high efficiencies in light load
situations.
The MIC2186 is available in 16 pin SOIC and QSOP package
options with an operating range from –40°C to 125°C.
Features
• Input voltage range: 2.9V to 14V
• 1.6Ω output driver
• Oscillator frequency of 100kHz/200kHz/400kHz
• Frequency sync to 600kHz
• Front edge blanking
• PWM Current Mode Control
• Selectable light load SKIP mode
• 600µA quiescent current (SKIP-Mode)
• 0.5µA shutdown current
• Cycle-by-Cycle current limiting
• Frequency foldback protection
• Adjustable under-voltage lockout
• Precision 1.245V reference output
• 16 pin SOIC and QSOP package options
• Selectable 50% maximum duty cycle for flyback applica-
tions
Applications
• DC power distribution systems
• Wireless Modems
• ADSL line cards
• SLIC power supplies
• 1-and 2-cell Li Ion battery operated equipment
Ordering Information
Part Number
MIC2186BM
MIC2186BQS
Frequency
100kHz/200kHz/400kHz
100kHz/200kHz/400kHz
Voltage
Adj
Adj
Ambient Temp. Range Package
–40°C to +125°C
16-lead SOP
–40°C to +125°C 16-lead QSOP
Typical Application
V_IN = 3.3V
C_IN
120µF
20V
2.2µH
MBR2535CT
1
VINA
7 _EN/UVLO
13 _HIDC
VINP ¹⁶
15 _FREQ/2
FB ⁶
10 _VDD
MIC2186
4 _COMP
OUTN ¹⁴
8 _VREF
2
SKIP
CSH ⁹
11 _SYNC
SS
3
PGND ¹²
SGND
5
Si4404DY
(x2)
4.5mΩ
V_OUT = 12V
C_OUT
150µF(x2)
20V
12V Output Efficiency
95
90
85
80
75
70
65
V_IN = 3.3V
600 _{0.5 1 1.5 2 2.5 3}
OUTPUT CURRENT (A)
Adjustable Output Boost Converter
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2002
1
MIC2186