Control IC. MIC2183 Datasheet

MIC2183 IC. Datasheet pdf. Equivalent

Part MIC2183
Description Low Voltage Synchronous Buck PWM Control IC
Feature MIC2183 Micrel, Inc. MIC2183 Low Voltage Synchronous Buck PWM Control IC General Description Micre.
Manufacture Micrel Semiconductor
Datasheet
Download MIC2183 Datasheet




MIC2183
MIC2183
Micrel, Inc.
MIC2183
Low Voltage Synchronous Buck PWM Control IC
General Description
Micrel’s MIC2183 is a high efficiency PWM synchronous
buck control IC. With its wide input voltage range of 2.9V to
14V, the MIC2183 can be used to efficiently step voltages
down in 1- or 2-cell Li Ion battery powered applications, as
well as in fixed 3.3V, 5V, or 12V systems.
Efficiencies over 90% are achievable over a wide range of
load conditions with the MIC2183’s PWM control scheme.
The operating frequency can be divided by two by raising the
FREQ/2 pin to VDD. This allows the user to optimize efficiency
versus board space. It also allows the MIC2183 to be exter-
nally synchronized to frequencies below its nominal 400KHz.
The MIC2183 features an oscillator output, FreqOut, which
can be used to implement a simple charge pump in low
voltage applications. The output of the charge pump can be
fed into the gate drive power circuitry via the VINP pin. This
feature allows enhanced gate drive, hence higher efficiencies
at low input voltages.
MIC2183 also features a 1µA shutdown mode, and a pro-
grammable undervoltage lockout, making it well-suited for
portable applications.
The MIC2183 is available in 16-pin SOP and QSOP packag-
ing options with a junction temperature range from -40°C to
+125°C.
Features
• Input voltage range: 2.9V to 14V
• >90% efficiency
• Oscillator frequency of 400kHz
• Frequency divide-by-two pin
• Frequency sync to 600kHz
• FreqOut oscillator output allows simple charge pump
implementation in low voltage systems
• Front edge blanking
• 5output drivers (typical)
• Soft start
• PWM current mode control
• 1µA shutdown current
• Cycle-by-cycle current limiting
• Frequency foldback short circuit protection
• Adjustable under-voltage lockout
• 16-pin narrow-body SOP and QSOP package options
Applications
• 3.3V to 2.5V/1.8V/1.5V conversion
• DC power distribution systems
• Wireless modems
• ADSL line cards
• 1-and 2-cell Li Ion battery operated equipment
• Satellite Phones
Typical Application
VIN = 3.3V
120µF (x2)
6.3V
1 VINA
16
VINP
7 EN/UVLO
2 FreqOut
15 FREQ/2 MIC2183
10 VDD
4 COMP
3 SS
11 SYNC
SGND
5
CSH 9
CSL 8
OUTP 14
1nF
Si9804DY
(x2)
OUTN 13
PGND 12
FB 6
15m
Si9803DY(x2)
4.7µH
B130
2.5VVO@UT5A
220µF (x2)
6.3V
100
95
90
85
80
75
70
65
60
55
500
MIC2183 EFFICIENCY
VIN = 3.3V
VOUT = 2.5V
fS = 200kHz
12345
OUTPUT CURRENT (A)
Adjustable Output Synchronous Buck 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
April 2005
1 M9999-042205



MIC2183
MIC2183
Ordering Information
Part Number
Standard
Pb-Free
MIC2183BM MIC2183YM
MIC2183BQS MIC2183YQS
Output
Voltage
Adj.
Adj.
Frequency
200/400KHz
200/400KHz
Micrel, Inc.
Junction
Temp. Range
–40°C to +125°C
–40°C to +125°C
Package
16-lead SOP
16-lead QSOP
Pin Configuration
VINA 1
FreqOut 2
SS 3
COMP 4
SGND 5
FB 6
EN/UVLO 7
CSL 8
16 VINP
15 FREQ/2
14 OUTP
13 OUTN
12 PGND
11 SYNC
10 VDD
9 CSH
16 Lead SOIC (M)
16 Lead QSOP (QS)
M9999-042205
2
April 2005







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