Boost Converter. MIC2142 Datasheet

MIC2142 Converter. Datasheet pdf. Equivalent

MIC2142 Datasheet
Recommendation MIC2142 Datasheet
Part MIC2142
Description Micropower Boost Converter
Feature MIC2142; MIC2142 Micropower Boost Converter General Description Features The MIC2142 is a micropower boost.
Manufacture Micrel Semiconductor
Datasheet
Download MIC2142 Datasheet




Micrel Semiconductor MIC2142
MIC2142
Micropower Boost Converter
General Description
Features
The MIC2142 is a micropower boost switching regulator
housed in a SOT23-5 package. The input voltage range is
between 2.2V to 16V, making the device suitable for one-
cell Li Ion and 3 to 4-cell alkaline/NiCad/NiMH applica-
tions. The output voltage of the MIC2142 can be adjusted
up to 22V.
The MIC2142 is well suited for portable, space-sensitive
applications. It features a low quiescent current of 85µA,
and a typical shutdown current of 0.1µA. It’s 330kHz
operation allows small surface mount external components
to be used. The MIC2142 is capable of efficiencies over
85% in a small board area.
The MIC2142 can be congured to efficiently power a
variety of loads. It is capable of providing a few mA output
for supplying low power bias voltages; it is also capable of
providing the 80mA needed to drive 4 white LEDs.
The MIC2142 is available in a SOT23-5 package with an
ambient operating temperature range from –40°C to
+85°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
2.2V to 16V input voltage
Up to 22V output voltage
330kHz switching frequency
0.1µA shutdown current
85µA quiescent current
Implements low-power boost, SEPIC, or yback
SOT23-5 package
Applications
LCD bias supply
White LED driver
12V Flash memory supply
Local 3V to 5V conversion
___________________________________________________________________________________________________________
Typical Application
2.8V to 4.7V
VIN
10CµIFN
L1
33µH
D1
+5V @60mA
MIC2142
1 VCC SW 3
FB 4
5 EN GND 2
R2
365k
R1
124k
C22OµUFT
Typical Configuration
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.400
Efficiency
vs. Output Current
VIN = 4.2V
VIN = 3.0V
10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
Efficiency vs. Output Current
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 2007
M9999-102507



Micrel Semiconductor MIC2142
Micrel, Inc.
MIC2142
Ordering Information
Part Number
Standard
Pb-Free
MIC2142BM5 MIC2142YM5
Marking*
Standard Pb-Free
SBAA
SBAA
* Under bar symbol (_) may not be to scale.
Voltage
Adj.
Ambient
Temperature Range
–40° to +85°C
Package
5-Pin SOT23
Pin Configuration
5-Pin SOT23 (BM5)
5-Pin SOT23 (YM5)
Pin Description
Pin Number
1
2
3
4
5
Pin Name
VCC
GND
SW
FB
EN
Pin Function
Chip Supply: +2.2V to +16V.
Ground: Return for internal circuitry and internal MOSFET (switch) source.
Switch Node (Input): Internal MOSFET drain; 22V maximum.
Feedback (Input): Output voltage sense node.
Shutdown: Device shuts down to 0.1µA typical supply current.
October 2007
2 M9999-102507



Micrel Semiconductor MIC2142
Micrel, Inc.
MIC2142
Absolute Maximum Ratings(1)
Supply Voltage (VCC)......................................................18V
Switch Voltage (VSW)......................................................24V
Enable Pin Voltage (VEN)(3).............................................18V
Feedback Voltage (VFB)
Adjustable Version.....................................................8V
Ambient Storage Temperature (Ts) ...........–65°C to +150°C
ESD Rating(4)
Operating Ratings(2)
Supply Voltage (VCC)......................................... 2.2V to 16V
Enable Pin Voltage (VEN)(3)................................... 0V to 16V
Switch Voltage (VSW)...................................................... 22V
Ambient Temperature (TA) .......................... –40°C to +85°C
Junction Temperature Range (TJ)............. –40°C to +125°C
Package Thermal Impedance
SOT23-5 (θJA) ..................................................220°C/W
Electrical Characteristics
VCC = 3.6V; VOUT = 5V; IOUT = 200mA; TA = 25°C, bold values indicate –40°C< TJ < +125°C, unless noted.
Parameter
Input Voltage
Quiescent Current
Feedback Voltage (VFB)
Comparator Hysteresis
Feedback Input Bias Current,
Note 5
Enable Input Voltage
Enable Input Current
Load Regulation
Line Regulation
SW on Resistance
Switch Leakage Current
Oscillator Frequency
Duty Cycle
Condition
VEN = ON , VFB = 2.2V (adjustable)
VEN = ON , VOUT(NOMINAL) + 1V (MIC2142-5.0)
VEN = OFF (shutdown)
(±2%)
(±3%)
adjustable
xed
VIH (turn on)
VIL (turn off)
200µA IOUT 20mA
2.2V VCC 16V; IOUT = 4mA (adjustable)
2.2V VCC 4.5V; IOUT = 4mA (MIC2142-5.0)
ISW = 100mA, VCC = 2.5V
VEN = OFF, VSW = 12V
Min
2.2
1.254
1.241
0.6VCC
–1
295
50
Typ
85
85
0.1
1.28
18
30
20
0.55VCC
1.1
0.01
0.2
0.25
0.25
5
0.05
330
57
Max
16
125
125
2
1.306
1.312
0.8
1
1
365
65
Units
V
µA
µA
µA
V
V
mV
nA
µA
V
V
µA
%VOUT
%/V
%/V
µA
kHz
%
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specications do not apply when operating
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(Max), the
junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown. The θJA of the power SOT23-5 is 220°C/W mounted on a PC board.
2. The device is not guaranteed to function outside its operating rating.
3. VEN must be VIN.
4. Devices are ESD sensitive. Handling precautions recommended.
5. The maximum suggested value of the programming resistor, whose series resistance is measured from feedback to ground, is 124k. Use of larger
resistor values can cause errors in the output voltage due to the feedback input bias current.
October 2007
3 M9999-102507







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