MIC2253 Datasheet PDF - MICREL

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MIC2253
MICREL

Part Number MIC2253
Description 3.5A 1MHz High Efficiency Boost Regulator
Page 13 Pages


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MIC2253
3.5A 1MHz High Efficiency
Boost Regulator with OVP and Softstart
General Description
Features
The MIC2253 is a high power density 1MHz PWM DC/DC
boost regulator. The 3.5A minimum switch current limit
combined with a 1MHz switching frequency allows the
MIC2253 to use smaller inductors and deliver high power
in a tiny solution size.
The 2.5V to 10V input voltage range of MIC2253 allows
direct operation from 1 and 2 cell Li-ion as well as 3 to 4
cell NiCad, NiMH, Alkaline or lithium batteries. Maximum
battery life is assured with a low 0.1µA shutdown current.
The MIC2253 is available in a low profile 12-pin 3mm x
3mm MLF© package. To prevent a high inrush current, a
minimum 1ms soft-start period is set by default and the
MIC2253 has the ability to extend the soft-start period with
an external capacitor.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
3.5A minimum switch current
1.245V ± 3% feedback voltage
2.5V to 10V input voltage
Output over-voltage protection (OVP)
Externally programmable soft-start
Output voltage up to 30V (max)
Fixed 1MHz operation
<1% line regulation
0.1µA shutdown current
Over temperature protection
Under-voltage lockout (UVLO)
12-pin 3mm x 3mm leadless MLF® package
–40°C to +125°C junction temperature range
Applications
Mobile handsets
Portable media/MP3 players
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital Cameras
Wireless LAN cards
USB powered devices
Portable applications
___________________________________________________________________________________________________________
Typical Application
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MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2010
M9999-021710-B



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Micrel, Inc.
MIC2253
Ordering Information
Part Number
Marking
Code(2)
OVP
Junction Temp. Range
Package
MIC2253-06YML
06
2253
6V
–40° to +125°C
12-Pin 3x3 MLF®
Note: MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Lead Finish
Pb-Free
Pin Configuration
12-Pin 3mm x 3mm MLF® (ML)
(Top View)
Pin Description
Pin Number
1
2
3
4
5,6
7,8
9
10
11
12
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Pin Name
NC
SS
FB
AGND
PGND
SW
OVP
VIN
EN
COMP
HS Pad
Pin Function
No connect. Not internally connected.
Soft start (Input). Connect a capacitor to GND to slowly turn on the device. The
higher the capacitance, the longer the turn-on time.
Feedback (Input): Output voltage sense node. Connect external resistors to set
the output voltage. Nominal feedback voltage is 1.245V.
Analog Ground
Power Ground
Switch Node: Internal power BIPOLAR collector.
Over-Voltage Protection (OVP): Connect to the output voltage to clamp the
maximum output voltage. A resistor divider from this pin to ground could be
used to raise the OVP level beyond 6V (max).
Supply (Input): 2.5V to 10V for internal circuitry.
Enable (Input): Applying 1.5V or greater enables the regulator. Applying a
voltage of 0.4V or less disables the MIC2253. Do not leave floating.
Compensation pin (Input): Add external R and C to GND to stabilize the
converter.
Exposed Heat-Sink pad.
February 2010
2 M9999-021710-B



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Micrel, Inc.
MIC2253
Absolute Maximum Ratings(1)
Supply Voltage (VIN) .......................................................12V
Switch Voltage (VSW)....................................... –0.3V to 34V
Enable Voltage (VEN)....................................... –0.3V to 12V
FB Voltage (VFB)...............................................................6V
Switch Current (ISW) ..................................Internally Limited
EASmDbieRnattiSntgo(3ra)..g..e...T..e..m...p..e..r.a..t.u..r.e...(.T...s.)........................–..6..5..°.C....t.o...+..1..5. 20k°CV
Operating Ratings(2)
Supply Voltage (VIN).......................................... 2.5V to 10V
Enable Voltage (VEN).............................................. 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Package Thermal Impedance
3mm x 3mm MLF-12 (θJA) .................................60°C/W
Electrical Characteristics(4)
TA = 25°C; VIN = VEN = 3.6V; unless otherwise noted. Bold values indicate –40°CTJ +125°C.
Symbol Parameter
Condition
Min Typ
VIN
VUVLO
VOVP
IVIN
ISD
Supply Voltage Range
Under-Voltage Lockout
Over-Voltage Protection
Quiescent Current
Shutdown Current
VFB >1.245V, Not Switching
VEN = 0V(5)
2.5
1.8 2.1
5.25 5.6
15
0.1
VFB Feedback Voltage
1.208 1.245
Max
10
2.4
6.3
23
1
1.283
Units
V
V
V
mA
µA
V
IFB Feedback Input Current
VFB = 1.245V
-450 nA
Line Regulation
3.0V VIN 4.5V
0.5 %
DMIN
Minimum Duty Cycle
10 %
DMAX
ISW
VSW
ISW
VEN
IEN
fSW
ISS
TJ
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency
Soft start
Over-Temperature Threshold
Shutdown
VIN = 3.6V
VIN = 3.6V, ISW = 3.5A
VEN = 0V, VSW = 10V
TURN ON
TURN OFF
VEN = 10V
VSS = 0V
Hysteresis
90
3.5 4.75
8
350 500
0.01 10
1.5
20
0.8 1
30
150
10
0.4
40
1.2
%
A
mV
µA
V
µA
MHz
µA
°C
°C
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications 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, θ JA, and the ambient temperature, TA. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human Body Model, 1.5kin series with 100pF.
4. Specification for packaged product only.
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February 2010
3 M9999-021710-B



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Micrel, Inc.
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency VOUT = 3.8V
V I N = 3.3V
VIN=3V
V I N = 2.5V
L = 2.2µH
C = 22µF
TA = 25°C
600 1200 1800 2400
OUTPUT CURRENT (mA)
Efficiency VOUT=15.0V
90
80
70 VIN=5V
60
V IN = 3.3V
VIN=4.2V
50
40
30
0
L = 2.2µH
C = 22µF
TA = 25°C
100 200 300 400 500 600 700
OUTPUT CURRENT (mA)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
2.5
Frequency
vs. Input Voltage
VOUT = 12V
IOU T = 300mA
L = 2.2µH
C = 22µF
4.0 5.5 7.0 8.5 10.0
INPUT VOLTAGE (V)
Load Regulation
5.10
5.08
5.06
5.04
5.02
5.00
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4.96
4.94
4.92
4.90
VOUT = 5V
L = 2.2µH
C = 22µF
TA = 25°C
0 400 800 1200 1600
OUTPUT CURRENT (mA)
February 2010
Efficiency VOUT=5.0V
90
80
70 VIN=4.5V
60 VIN=3.6V
VIN=2.5V
50
40
30
20
0
L = 2.2µH
C = 22µF
TA = 25°C
600 1200 1800 2400
OUTPUT CURRENT (mA)
Quiescent Current
vs. T emperature
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
VIN = 3.6V
12.5
12.0
VFB = 2.5V
Not Switching
-40 -20 0 20 40 60 80 100 120
T E M P E R AT U R E (°C )
Frequency
vs. T emperature
1200
1100
1000
900
800
700
-40 -20 0
VOUT = 5V
VIN = 3.6V
Load = 200mA
20 40 60 80 100 120
TEMPERATURE (°C)
12.5
12.4
12.3
12.2
12.1
12.0
11.9
11.8
11.7
11.6
11.5
2.5
Line Regulation
VOUT = 12V
L = 2.2µH
C = 22µF
TA = 25°C
Load = 20mA
4.0 5.5 7.0 8.5 10.0
INPUT VOLTAGE (V)
4
MIC2253
Efficiency VOUT=12.0V
90
80
70 VIN=5V
V IN = 4.2V
60 VIN=3.3V
50
40
30
0
L = 2.2µH
C = 22µF
TA = 25°C
200 400 600 800 1000 1200
OUTPUT CURRENT (mA)
Quiescent Current
vs. Input Voltage
17.0
16.0
15.0
14.0
13.0
12.0
11.0
2.5
VFB = 2.5V
Not Switching
4.0 5.5 7.0 8.5 10.0
IN PUT VOLTAGE (V)
Feedback Voltage
vs. T emperature
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
VOUT = 5V
VIN = 3.6V
Load = 200mA
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
2.5
Current Limit
vs. Input Voltage
VOUT = 12V
L = 2.2µH
C = 22µF
TA = 25°C
4.0 5.5 7.0 8.5 10.0
INPUT VOLTAGE (V)
M9999-021710-B



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