Control IC. MIC2184 Datasheet

MIC2184 IC. Datasheet pdf. Equivalent

Part MIC2184
Description Low Voltage Buck PWM Control IC
Feature MIC2184 Micrel, Inc. MIC2184 Low Voltage Buck PWM Control IC General Description Micrel’s MIC2184 .
Manufacture Micrel Semiconductor
Total Page 12 Pages
Datasheet
Download MIC2184 Datasheet



MIC2184
MIC2184
Micrel, Inc.
MIC2184
Low Voltage Buck PWM Control IC
General Description
Micrel’s MIC2184 is a high efficiency PWM buck control IC.
With its wide input voltage range of 2.9V to 14V, the MIC2184
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 MIC2184’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 MIC2184 to be exter-
nally synchronized to frequencies below its nominal 400KHz.
The MIC2184 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,
allowing enhanced gate drive, hence higher efficiencies,
despite low input voltages.
MIC2184 features a 1µA shutdown mode, and a program-
mable undervoltage lockout, making it well suited for portable
applications.
The MIC2184 is available in 16 pin SOP and QSOP package
options with a junction temperture range 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
• FrequOut oscillator output allows simple charge pump
implementation in low voltage systems
• 1.245V reference output
• Front edge blanking
• 5output driver
• 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 SOIC 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
16
FREQ/2
10
VDD
MIC2184
4
COMP
3
SS
13 VREF
SYNC SGND
11 5
9
CSH
CSL 8
14
OUTP
12
PGND
6
FB
15m
Q3
Si9803DY(x2)
4.7µH
VOUT
2.5V @5A
220µF(x2)
6.3V
100
95
90
85
80
75
70
65
60
55
500
MIC2184 EFFICIENCY
VIN = 3.3V
VOUT = 2.5V
fS = 200kHz
12345
OUTPUT CURRENT (A)
Adjustable Output 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



MIC2184
MIC2184
Ordering Information
Part Number
Standard
Pb-Free
MIC2184BM MIC2184YM
MIC2184BQS MIC2184YQS
Output
Voltage
Adj.
Adj.
Frequency
400KHz
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 VREF
12 PGND
11 SYNC
10 VDD
9 CSH
16 Lead SOIC
(M)
M9999-042205
2
April 2005





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