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MIC2295
High Power Density 1.2A Boost Regulator
General Description
The MIC2295 is a 1.2Mhz, PWM dc/dc boost
switching regulator available in low profile Thin
SOT23 and 2mm x 2mm MLF package options.
High power density is achieved with the MIC2295’s
internal 34V / 1.2A switch, allowing it to power large
loads in a tiny footprint.
The MIC2295 implements constant frequency
1.2MHz PWM current mode control. The MIC2295
offers internal compensation that offers excellent
transient response and output regulation
performance. The high frequency operation saves
board space by allowing small, low-profile external
components. The fixed frequency PWM scheme also
reduces spurious switching noise and ripple to the
input power source.
The MIC2295 is available in a low-profile Thin
SOT23 5-lead package and a 2mm x2mm 8-lead
MLF leadless package. The 2mm x 2mm MLF
package option has an output over-voltage
protection feature.
The MIC2295 has an operating junction temperature
range of –40°C to +125°C.
V
OUT
15V
V
OUT
100mA
SW
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
2.5V to 10V input voltage range
Output voltage adjustable to 34V
1.2A switch current
1.2MHz PWM operation
Stable with small size ceramic capacitors
High efficiency
Low input and output ripple
<1mA shutdown current
UVLO
Output over-voltage protection (MIC2295BML)
Over temperature shutdown
Thin SOT23-5 package option
2mm x 2mm leadless 8-lead MLF package
option
–40
o
C to +125
o
C junction temperature range
•
Applications
•
•
•
•
•
•
•
•
•
Organic EL power supplies
3.3V to 5V/500mA conversion
TFT-LCD bias supplies
Flash LED drivers
Positive and negative output regulators
SEPIC converters
Positive to negative Cuk converters
12V supply for DSL applications
Multi-output dc/dc converters
V
IN
VIN
10µH
10µH
R1
100K
15V /
200mA
V
IN
1-Cell
Li Ion
3V to 4.2V
1µF
1-Cell
Li Ion
3V to 4.2V
MIC2295
OVP
SW
VIN
FB
EN
MIC2295
BML
OVP
FB
EN
C1
2.2µF
AGND
AGND
PGND
R1
100k
R2
9.01K
R2
9.01K
2.2µF
2.2µF
PGND
2mm x 2mm Boost Regulator
MLF is a trademark of Amkor Technology.
July 2004
M9999-72104
hbwhelp@micrel.com
or (408) 955-1690
Micrel
MIC2295
Ordering Information
Part Number
MIC2295BD5
MIC2295YD5
MIC2295BML
MIC2295YML
Output Over
Voltage
Protection
-
-
34V
34V
Marking
Code*
SVAA
SVAA
SXA
SXA
Junction
Temperature
Range
-40°C to 125°C
-40°C to 125°C
-40°C to 125°C
Package
Lead Finish
Thin SOT23-5
Thin SOT23-5
2mm x2mm MLF-8L
2mm x2mm MLF-8L
Standard
Pb-Free
Standard
Pb-Free
-40°C to 125°C
* Marking codes to be confirmed by Product Engineering.
Pin Configuration
Pin Description
MIC2295BD5
Thin SOT-23-5
1
2
3
4
5
MIC2295BML
2x2 MLF-8L
7
6
3
2
1
Pin Name
Pin Function
SW
GND
FB
EN
VIN
OVP
5
4
8
EP
July 2004
N/C
AGND
PGND
GND
Switch Node (Input): Internal power BIPOLAR collector.
Ground (Return): Ground.
Feedback (Input): 1.24V output voltage sense node.
V
OUT
= 1.24V ( 1 + R1/R2)
Enable (Input): Logic high enables regulator. Logic low
shuts down regulator.
Supply (Input): 2.5V to 10V input voltage.
Output Over-Voltage Protection (Input): Tie this pin to
V
OUT
to clamp the output voltage to 34V maximum in
fault conditions. Tie this pin to ground if OVP function
is not required.
No connect. No internal connection to die.
Analog ground
Power ground
Ground (Return). Exposed backside pad.
M9999-052402
2
(408) 955-1690
Micrel
MIC2295
Absolute Maximum Rating (Note 1)
Supply voltage (V
IN
) ……………………..…
12V
Switch voltage (V
SW
) ……………………
-0.3V to 34V
Enable pin voltage (V
EN
) …………..……..…. -0.3 to V
IN
FB Voltage (V
FB
)……...………………………..…………6V
Switch Current (I
SW
) ………………………..…..….. 2.5A
Ambient Storage Temperature (T
S
) …. -65°C to +150°C
ESD Rating,
Note 3...…………………………
……..2KV
Operating Range (Note 2)
Supply Voltage (V
IN
) …………………..…… 2.5V to 10V
Junction Temperature Range (T
J
) …… -40°C to +125°C
Package Thermal Impedance
93°C/W
JA
2x2 MLF-8L lead ……………………
JA
ThinSOT23-5 lead …………………… 256°C/W
Electrical Characteristics
T =25 C, V
A
o
IN
=V
EN
= 3.6V, V
OUT
= 15V, I
OUT
= 40mA, unless otherwise noted.
Bold
values
indicate -40°C
T
J
125°C.
Parameter
Supply Voltage Range
Under-Voltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Symb
ol
V
IN
V
UVLO
I
VIN
I
SD
V
FB
Condition
Min
2.5
1.8
Typ
2.1
2.8
0.1
1.24
Max Unit
s
10
2.4
5
1
1.252
V
1.265
V
V
mA
mA
V
FB
= 2V (not switching)
V
EN
= 0V.
Note 4.
(+/-1%)
(+/-2%) (Over Temp)
1.22
7
1.21
5
Feedback Input Current
Line Regulation
Load Regulation
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency
Output over-voltage
protection
Over-Temperature
Threshold Shutdown
I
FB
V
FB
= 1.24V
3V
5mA
V
IN
5V
40mA
85
Note 5
I
SW
= 1.2A
V
EN
= 0V, V
SW
= 10V
TURN ON
TURN OFF
V
EN
= 10V
MIC2295BML only
1.2
I
OUT
-450
0.04
1
1.5
90
1.7
600
0.01
nA
%
%
%
A
mV
mA
V
mA
MHz
V
°C
°C
D
MAX
I
SW
V
SW
I
SW
V
EN
I
EN
f
SW
V
OVP
Tj
5
0.4
40
1.35
34
1.5
20
1.2
32
150
10
1.05
30
Hysteresis
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
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,
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.
This device is not guaranteed to operate beyond its specified operating rating.
IC devices are inherently ESD sensitive. Handling precautions required. Human body model rating: 1.5K in series with 100pF.
I
SD
= I
VIN
.
Guaranteed by design
July 2004
3
M9999-052402
(408) 955-1690
Micrel
MIC2295
Typical Characteristics
MIC2295 SEPIC 5V Output
78
76
74
80
75
70
65
5V MIC2295 SEPIC with one
coupled inductor
300
250
Switch Voltage
vs. Supply Voltage
Switch Voltage (mV)
300
EFFICIENCY (%)
EFICIENCY (%)
200
150
100
50
0
2.5
60
55
50
45
40
35
30
72
70
68
66
64
0
50
100
150
200
250
Vin=3V
Vin=3.5V
Vin=4V
Vin=5V
Vin=5.5V
Vin=2.5
V
Vin=3.3
V
Vin=5V
0
50
100
150
200
250
4.5
6.5
8.5
OUTPUT CURRENT (mA)
LOAD CURRENT (mA)
Input Voltage (V)
Max Duty Cycle vs Input Voltage
100
95
1.5
Input Voltage
vs. Supply Voltage
MIC2295 15V output Efficiency
90
85
1.3
FREQUENCY (MHz)
EFFICIENCY (%)
DUTY CYCLE
90
85
80
75
70
2.5
80
75
70
65
60
1.1
0.9
0.7
Vin=3.3V
Vin=4V
Vin=4.2V
0
50
100
150
200
0.5
2.5
4
5.5
7
8.5
10
4
5.5
7
8.5
10
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
MIC2295 12V output Efficiency
90
85
15V Short circuit
protected Boost
85
12.2
OUTPUT VOLTAGE (V)
12.15
12.1
12.05
12
11.95
11.9
11.85
11.8
0
Load Regulation
80
80
75
70
EFFICIENCY (%)
EFFICIENCY (%)
75
70
65
60
0
50
100
Vin=3.3V
Vin=4.2V
Vin=3.6V
150
200
65
Vin=2.5
V
Vin=3V
V
IN =
3.6V
25
50 75 100 125 150
LOAD (mA)
60
OUTPUT CURRENT (mA)
0
20
40
60
80
100
OUTPUT CURRENT (mA)
FEEDBACK VOLTAGE (V)
CURRENT LIMIT (A)
1.0
0.8
0.6
0.4
0.2
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
FREQUENCY (MHz)
1.30
1.28
1.26
1.24
1.22
Feedback Voltage
vs. Temperature
1.4
1.2
Current
Limit
vs. Temperature
1.4
1.3
1.2
1.1
1.0
0.9
Frequency
vs. Temperature
1.20
1.18
1.16
1.14
1.12
1.10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0.8
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
July 2004
4
M9999-052402
(408) 955-1690
