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MIC2185BQS

Description
Low Voltage Synchronous Boost PWM Control IC
CategoryPower/power management    The power supply circuit   
File Size314KB,15 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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MIC2185BQS Overview

Low Voltage Synchronous Boost PWM Control IC

MIC2185BQS Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerMicrochip
Parts packaging codeSOIC
package instructionSSOP, SSOP16,.25
Contacts16
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage14 V
Minimum input voltage2.9 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length4.89 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.0005 A
Nominal output voltage3 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height1.748 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency440 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn85Pb15)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.9 mm
MIC2185
Micrel, Inc.
MIC2185
Low Voltage Synchronous Boost PWM Control IC
General Description
Micrel’s MIC2185 is a high efficiency synchronous boost
PWM control IC. With its wide input voltage range of 2.9V to
14V, the MIC2185 can be used to efficiently boost voltages
in 1- or 2-cell Li Ion battery powered applications, as well as
fixed 3.3V and 5V systems. Its powerful 5Ω output drivers
allow the MIC2185 to supply large output currents with the
selection of the proper external MOSFETs.
With it’s fixed frequency PWM architecture, and easily
synchronized drive, the MIC2185 is ideal for noise-sensi-
tive telecommunications applications. The nominal 400kHz
operating frequency of the MIC2185 can be divided by two,
allowing the device to be externally synchronized to frequen-
cies below 400kHz.
The MIC2185 also features a low current shutdown mode
and a programmable undervoltage lockout. A skipped pulse
mode of operation can be manually set to achieve higher
efficiencies at light load conditions.
The MIC2185 is available in a 16 pin SOIC package and 16
pin QSOP package with an ambient temperature operating
range from –40°C to 85°C.
Features
Input voltage range: 2.9V to 14V
95% efficiency
Oscillator frequency of 200kHz/400kHz
Frequency sync to 600kHz
0.5µA shutdown current
Two 5Ω output drivers
Front edge blanking
PWM current mode control
Cycle-by-cycle current limiting
Frequency foldback protection
Adjustable under-voltage lockout
Precision 1.245V reference output
16 pin SOIC narrow body package
3.3V to 5V conversion in telecom systems
Satellite phones
Cable modems
1-and 2-cell Li Ion battery operated equipment
Applications
Ordering Information
Part Number
Standard
MIC2185BM
MIC2185BQS
Pb-Free
MIC2185YM
MIC2185YQS
Frequency
200/400kHz
200/400kHz
Voltage
Adj
Adj
Junction
Temp. Range
–40ºC to +125ºC
–40ºC to +125ºC
Package
16-pin SOIC
16-pin QSOP
Typical Application
V
IN
= 3.3V
C
IN
1
7
15
10
4
8
11
2
2.4µH
Si9803DY (x2)
V
OUT
= 5V
VINA
EN/UVLO
FREQ/2
VDD
COMP
VREF
SYNC
SKIP
SS
3
OUTP
VINP
FB
MIC2185
14
16
6
C
OUT
100
5V Output Efficiency
OUTN
CSH
13
9
Si4884DY (x2)
95
90
8m
PGND
SGND
5
12
85
80
75
70
0
V
IN
= 3.3V
200kHz P WM
1
2
3
4
5
OUTPUT CURRENT (A)
Adjustable Output Synchronous 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
October 2005
1
MIC2185

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