MIC2290
2mm × 2mm PWM Boost Regulator
with Internal Schotty Diode
General Description
The MIC2290 is a 1.2MHz, PWM, boost-switching
regulator housed in the small size 2mm × 2mm 8-pin MLF
®
package. The MIC2290 features an internal Schottky diode
that reduces circuit board area and total solution cost. High
power density is achieved with the MIC2290’s internal
34V/0.5A switch, allowing it to power large loads in a tiny
footprint.
The MIC2290 implements a constant frequency 1.2MHz
PWM control scheme. The high frequency operation saves
board space by reducing external component sizes. The
fixed frequency PWM topology also reduces switching
noise and ripple to the input power source.
The MIC2290’s wide 2.5V to 10V input voltage allows
direct operation from 3- to 4-cell NiCad/NiMH/Alkaline
batteries, 1-and 2-cell Li-Ion batteries, as well as fixed
3.3V and 5V systems.
The MIC2290 is available in a low-profile 2mm×2mm 8-pin
MLF
®
leadless package and operates from a junction
temperature range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Internal Schottky diode
2.5V to 10V input voltage
Output voltage adjustable to 34V
Over 500mA switch current
1.2MHz PWM operation
Stable with ceramic capacitors
<1% line and load regulation
Low input and output ripple
<1µA shutdown current
UVLO
Output overvoltage protection
Over temperature protection
2mm × 2mm 8-pin MLF
®
package
–40°C to +125°C junction temperature range
Applications
•
•
•
•
•
Organic EL power supply
TFT LCD bias supply
12V DSL power supply
CCD bias supply
SEPIC converters
___________________________________________________________________________________________________________
Typical Application
V
IN
L1
10µH
V
OUT
12V
12V
OUT
Efficiency
85
80
V
IN
= 4.2V
2
3
VIN
EN
SW
OUT
7
EFFICIENCY (%)
MIC2290
R1
1
6
75
70
65
60
V
IN
= 3.2V
V
IN
= 3.6V
Li Ion
Battery
C1
1µF
GND
FB
C2
10µF
R2
4, 8
0
0.02 0.04 0.06 0.08
LOAD CURRENT (A)
0.1
Simple 12V Boost Regulator
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
October 2007
M9999-101907
Micrel, Inc.
MIC2290
Ordering Information
Part Number
MIC2290BML
MIC2290YML
Marking
Code
SRC
SRC
Output
Voltage
Adj.
Adj.
Overvoltage
Protection
34V
34V
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
Package
8-Pin 2x2 MLF
®
Lead Finish
Standard
Pb-Free
8-Pin 2x2 MLF
®
Pin Configuration
OUT
VIN
EN
AGND
1
2
3
4
8
7
6
5
PGND
SW
FB
NC
8-Pin 2mm x 2mm MLF
®
(ML)
(Top View)
Pin Description
Pin Number
1
Pin Name
OUT
Pin Function
Output pin (Output): Output voltage. Connect to FB resistor divider. This pin
has an internal 34V output overvoltage clamp. See “Block Diagram” and
“Applications” section for more information.
Supply (Input): 2.5V to 10V input voltage.
Enable (Input): Logic high enables regulator. Logic low shuts down regulator.
Analog ground.
No connect (no internal connection to die).
Feedback (Input): Output voltage sense node. Connect feedback resistor
network to this pin.
V
OUT
=
1.24V
⎜
1
+
2
3
4
5
6
VIN
EN
AGND
NC
FB
⎛
⎝
R1
⎞
⎟
.
R2
⎠
7
8
EP
SW
PGND
GND
Switch node (Input): Internal power Bipolar collector.
Power ground.
Ground (Return): Exposed backside pad.
October 2007
2
M9999-101907
Micrel, Inc.
MIC2290
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .......................................................12V
Switch Voltage (V
SW
)....................................... –0.3V to 34V
Enable Pin Voltage (V
EN
)................................... –0.3V to V
IN
FB Voltage (V
FB
)...............................................................6V
Switch Current (I
SW
) .........................................................2A
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
).......................................... 2.5V to 10V
Ambient Temperature (T
J
)......................... –40°C to +125°C
Package Thermal Resistance
2x2 MLF-8 (θ
JA
) .................................................93°C/W
Electrical Characteristics
(4)
T
A
= 25°C, V
IN
= V
EN
= 3.6V, V
OUT
= 15V, I
OUT
= 40mA, unless otherwise noted.
Bold
values indicate –40°C
≤
T
J
≤
±125°C.
Symbol
V
IN
V
UVLO
I
VIN
I
SD
V
FB
I
FB
Parameter
Supply Voltage Range
Undervoltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
Load Regulation
D
MAX
I
SW
V
SW
I
SW
V
EN
I
EN
f
SW
V
D
I
RD
V
OVP
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. IC devices are inherently ESD sensitive. Handling precautions required. Human body model rating: 1.5K in series with 100pF.
4. Specification for packaged product only.
5. I
SD
= I
VIN
.
Condition
Min
2.5
1.8
Typ
2.1
2.5
0.2
Max
10
2.4
5
1
1.252
1.265
1
Units
V
V
mA
µA
V
V
nA
%
%
%
A
mV
V
FB
= 2V, (not switching)
V
EN
= 0V,
Note 5
(±1%)
(±2%) (Over Temp)
V
FB
= 1.24V
3V
≤
V
IN
≤
5V
5mA
≤
I
OUT
≤
20mA
85
I
SW
= 0.5A
V
EN
= 0V, V
SW
= 10V
Turn on
Turn off
V
EN
= 10V
1.05
I
D
= 150mA
V
R
= 30V
(nominal voltage)
Hysteresis
30
1.5
1.227
1.215
1.24
–450
0.1
0.2
90
0.75
450
0.01
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency
Schottky Forward Drop
Schottky Leakage Current
Overvoltage Protection
Overtemperature
Threshold Shutdown
5
0.4
µA
V
V
µA
MHz
V
µA
V
°C
°C
20
1.2
0.8
32
150
10
40
1.35
1
4
34
October 2007
3
M9999-101907
Micrel, Inc.
MIC2290
Typical Characteristics
Efficiency at V = 12V
OUT
V
IN
= 4.2V
90
85
EFFICIENCY (%)
80
75
70 V
IN
= 3.6V
65
60
55
50
0
25
50
75
100
OUTPUT CURRENT (mA)
V
IN
= 3.3V
0.9
0.8
CURRENT LIMIT (A)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.5
Current Limit
vs. Supply Voltage
4
5.5
7
8.5
SUPPLY VOLTAGE (V)
10
SWITCH SATURATION VOLTAGE (mV)
700
600
Switch Saturation Voltage
vs. Temperature
1.40
1.35
FREQUENCY (MHz)
1.30
1.25
1.20
1.15
1.10
1.05
Frequency
vs. Temperature
500
400
300
200
100
V
IN
= 3.6V
I
SW
= 500mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.00
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
99
MAXIMUM DUTY CYCLE (%)
97
95
93
91
89
87
Maximum Duty Cycle
vs. Temperature
FEEDBACK CURRENT (nA)
700
600
500
400
300
200
100
FB Pin Current
vs. Temperature
V
IN
= 3.6V
85
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
October 2007
4
M9999-101907
Micrel, Inc.
MIC2290
Typical Characteristics (continued)
October 2007
5
M9999-101907
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