MIC2253
3.5A 1MHz High Efficiency
Boost Regulator with OVP and Softstart
General Description
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.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
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
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
April 2011
M9999-042011-C
Micrel, Inc.
MIC2253
Ordering Information
Part Number
MIC2253-06YML
®
Marking
Code
(2)
06
2253
OVP
6V
Junction Temp. Range
–40° to +125°C
Package
12-Pin 3x3 MLF
®
Lead Finish
Pb-Free
Note:
MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen 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
Pin Name
NC
SS
FB
AGND
PGND
SW
OVP
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.
10
11
12
EP
VIN
EN
COMP
HS Pad
April 2011
2
M9999-042011-C
Micrel, Inc.
MIC2253
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................................12V
Switch Voltage (V
SW
)....................................... –0.3V to 34V
Enable Voltage (V
EN
)....................................... –0.3V to 12V
FB Voltage (V
FB
)...............................................................6V
Switch Current (I
SW
) ..................................Internally Limited
Ambient Storage Temperature (T
s
) ...........–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
).......................................... 2.5V to 10V
Enable Voltage (V
EN
).............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Impedance
3mm x 3mm MLF-12 (θ
JA
) .................................60°C/W
Electrical Characteristics
(4)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; unless otherwise noted.
Bold
values indicate –40°C≤ T
J
≤
+125°C.
Symbol
V
IN
V
UVLO
V
OVP
I
VIN
I
SD
V
FB
I
FB
Parameter
Supply Voltage Range
Under-Voltage Lockout
Over-Voltage Protection
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
D
MIN
D
MAX
I
SW
V
SW
I
SW
V
EN
I
EN
f
SW
I
SS
T
J
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, T
J(Max)
, the
junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. 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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
5. I
SD
= I
VIN
Condition
Min
2.5
1.8
5.25
Typ
2.1
5.6
15
0.1
Max
10
2.4
6.3
23
1
1.283
Units
V
V
V
mA
µA
V
nA
%
%
%
V
FB
>1.245V, Not Switching
V
EN
= 0V
(5)
1.208
V
FB
= 1.245V
3.0V
≤
V
IN
≤
4.5V
1.245
-450
0.5
10
90
Minimum Duty Cycle
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
V
SS
= 0V
Hysteresis
V
IN
= 3.6V
V
IN
= 3.6V, I
SW
= 3.5A
V
EN
= 0V, V
SW
= 10V
TURN ON
TURN OFF
V
EN
= 10V
0.8
1.5
3.5
4.75
350
0.01
8
500
10
0.4
A
mV
µA
V
µA
MHz
µA
°C
°C
20
1
30
150
10
40
1.2
April 2011
3
M9999-042011-C
Micrel, Inc.
MIC2253
Typical Characteristics
Efficiency V
OUT
= 3.8V
100
90
80
EFFICIENC Y (%)
60
50
40
30
20
10
0
0
600
1200
1800
2400
OUTPUT CURR EN T (mA)
L = 2.2µH
C = 22µF
T
A
= 25°C
V
IN
=3V
V
IN
=2.5V
V
IN
=3.3V
Efficiency V
OUT
=5.0V
90
80
EFFIC IEN CY (%)
70
60
50
40
30
20
0
600
1200
1800
2400
OUTPU T CU RRENT (mA)
L = 2.2µH
C = 22µF
T
A
= 25°C
V
IN
=3.6V
V
IN
=2.5V
V
IN
=4.5V
Efficiency V
OUT
=12.0V
90
80
EFFICIENCY (%)
70
60
50
40
30
0
L = 2.2µH
C = 22µF
T
A
= 25°C
V
IN
=3.3V
V
IN
=5V
V
IN
=4.2V
70
200 400 600 800 1000 1200
OUTPUT C URRENT (mA)
Efficiency V
OUT
=15.0V
90
QUIESCENT CURRENT ( mA)
17.0
16.5
Quiescent Current
vs. T emperature
17.0
QUIESCENT CURRENT (mA)
Quiescent Current
vs. Input Voltage
80
EFFICIENCY (%)
70
60
50
40
30
0
L = 2.2µH
C = 22µF
T
A
= 25°C
V
IN
=3.3V
V
IN
=4.2V
V
IN
=5V
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
-40 -20
0
20
40
60
80 100 120
V
IN
= 3.6V
V
F B
= 2.5V
Not Switching
16.0
15.0
14.0
13.0
12.0
11.0
2.5
4.0
5.5
7.0
8.5
10.0
V
F B
= 2.5V
Not Switching
100 200 300 400 500 600 700
OUTPUT CU RRENT (mA)
TEMPERATURE(°C)
IN PUT VOLTAGE (V)
1500
1400
1300
FREQUENCY (kHz)
1200
1100
1000
900
800
700
600
500
2.5
Frequency
vs. Input Voltage
Frequency
vs. T emperature
1200
1100
FREQUENCY ( kHz)
1000
900
800
700
V
OU T
= 5V
V
IN
= 3.6V
Load = 200mA
Feedback Voltage
vs. T emperature
1.30
1.29
FEEDBAC K VOLTA GE (V)
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
-40 -20
0
V
OU T
= 5V
V
IN
= 3.6V
Load = 200mA
V
OU T
= 12V
I
OU T
= 300mA
L = 2.2µH
C = 22µF
4.0
5.5
7.0
8.5
INPUT VOLTAGE (V)
10.0
-40 -20
0
20 40 60 80 100 120
20 40 60
80 100 120
TEMPERATURE (°C)
TEMPERATUR E (°C)
Load Regulation
5.10
5.08
OUTPUT VOLTAGE (V)
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
0
V
OU T
= 5V
L = 2.2µH
C = 22µF
T
A
= 25°C
Line Regulation
12.5
12.4
12.2
12.1
12.0
11.9
11.8
11.7
11.6
11.5
2.5
4.0
5.5
7.0
8.5
INPUT VOLTAGE (V)
10.0
V
OU T
= 12V
L = 2.2µH
C = 22µF
T
A
= 25°C
Load = 20mA
5.0
4.9
SW CURRENT LIMIT (A)
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
OUTPUT VOLTA GE (V)
12.3
V
OU T
= 12V
L = 2.2µH
C = 22µF
T
A
= 25°C
400
800
1200
1600
OUTPUT CU RRENT (mA)
4.0
5.5
7.0
8.5
INPUT VOLTAGE (V)
10.0
April 2011
4
M9999-042011-C
Micrel, Inc.
MIC2253
Typical Characteristics
(Continued)
450
SATURATION VOLTAGE (mV)
Saturation Voltage
vs. Switch Current
1.40
1.38
ENABLE THRESHOLD (V)
Enable T hreshold
vs. Input Voltage
400
350
300
250
200
150
100
50
0
0.0
0.5 1.0 1.5 2.0 2.5 3.0
SWITCH CURRENT (A)
3.5
V
IN
= 2.5V
T
A
= 25°C
1.36
1.34
1.32
1.30
1.28
1.26
1.24
1.22
1.20
2.5
4.0
5.5
7.0
8.5
10.0
INPUT VOLTAGE (V)
V
OU T
= 12V
I
OU T
= 20mA
L = 2.2µH
C = 22µF
April 2011
5
M9999-042011-C
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