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
Features
•
•
•
•
•
•
•
•
•
•
•
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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
<1µA 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
•
•
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•
•
•
•
•
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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
10µH
V
OUT
15V/100mA
L1
10µH
V
OUT
5V/500mA
V
IN
1-Cell
Li Ion
3V to 4.2V
MIC2295BML
SW
VIN
OVP
FB
EN
C1
2.2µF
AGND
PGND
R2
4.53K
MIC2295 BD5
R1
49.9k
2.2µF
VIN
V
IN
1-Cell
Li Ion
EN
C1
2.2µF
SW
FB
R1
10k
10µF
R2
3.3k
GND
MLF and
MicroLeadFrame
is a trademark of Amkor Technology
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 2005
M9999-042605
(408) 955-1690
Micrel, Inc.
MIC2295
Ordering Information
Part Number
Standard
MIC2295BD5
MIC2295BML
Lead-Free
MIC2295YD5
MIC2295YML
Output Over
Voltage Protection
—
34V
Marking Code
Standard
SVAA
SXA
Lead-Free
SVAA
SXA
Junction Temperature
Range
-40°C to 125°C
-40°C to 125°C
Package
Thin SOT23-5
2mm x2mm
MLF-8L
Pin Configuration
Pin Description
MIC2295BD5
Thin SOT-23-5
1
2
3
4
5
—
—
—
—
—
MIC2295BML
2x2 MLF-8L
7
—
6
3
2
1
5
4
8
EP
Pin Name
SW
GND
FB
EN
VIN
OVP
N/C
AGND
PGND
GND
Pin Function
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.
April 2005
2
M9999-042605
(408) 955-1690
Micrel, Inc.
MIC2295
Absolute Maximum Rating
(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
(3)
................................................................. 2KV
Operating Range
(2)
Supply Voltage (V
IN
).......................................... 2.5V to 10V
Junction Temperature Range (T
J
)..............-40°C to +125°C
Package Thermal Impedance
θ
JA
2x2 MLF-8 lead ............................................93°C/W
θ
JA
Thin SOT-23-5 lead ...................................256°C/W
Electrical Characteristics
T
A
=25
o
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
Under-Voltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
Load Regulation
D
MAX
I
SW
V
SW
I
SW
V
EN
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Note 5
I
SW
= 1.2A
V
EN
= 0V, V
SW
= 10V
TURN ON
TURN OFF
1.5
0.4
V
FB
= 2V (not switching)
V
EN
= 0V
(4)
(+/-1%)
(+/-2%) (Over Temp)
V
FB
= 1.24V
3V
≤
V
IN
≤
5V
5mA
≤
I
OUT
≤
40mA
85
1.2
90
1.7
600
0.01
5
1.227
1.215
-450
0.04
1
1.5
Condition
Min
2.5
1.8
2.1
2.8
0.1
1.24
Typ
Max
10
2.4
5
1
1.252
1.265
Units
V
V
mA
µA
V
nA
%
%
%
A
mV
µA
V
µ
A
I
EN
f
SW
V
OVP
T
J
Notes:
1.
Enable Pin Current
Oscillator Frequency
Output over-voltage protection
Over-Temperature Threshold
Shutdown
V
EN
= 10V
1.05
MIC2295BML only
Hysteresis
30
20
1.2
32
150
10
40
1.35
34
MHz
V
°C
°C
2.
3.
4.
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,
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.
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.
April 2005
3
M9999-042605
(408) 955-1690
Micrel
MIC2295
Typical Characteristics
80
75
70
65
60
55
50
45
40
35
30
0
100
200
300
Output Current
Vin=4V
Vin=5V
Vin=5.5V
GND
2
MIC2295 -5V Output
V
IN
= 5V
5
C3
L1
1uF/16V
1
SW
L2
V
OUT
= -5V @ 0.15A
C1
1 F/
6.3V
VIN
CMHSH5-2L
MIC2295BML
4
EN
OVP
FB
3
C2
4.7uF/
6.3V
R3
10K
R1
10K
L1 = Murata LQH32CN4R7M23
L2 = Murata LQH32CN4R7M23
MIC6211
C4
1uF/
6.3V
+
-
R2
2.49K
15V Short circuit
protected Boost
85
Sumida
CDRH4D18
4.7µH
5
VIN
1
SW
0.1uF/
6.3V
V
OUT
= 15V / 50mA
80
75
1-Cell
Li Ion
Vin=2.5
V
Vin=3V
10µF/
6.3V
4
EN
MIC2295
FB
GND
2
3
160K
4.7µF/
25V
70
65
10K
60
0
20
40
60
80
100
OUTPUT CURRENT (mA)
C
IN
= JMK212BJ106MG (Taiyo Yuden
)
April 2005
4
M9999-042605
(408) 955-1690
Micrel
L1
4.7uH
5
MIC2295
C3
1uF/16V
1
SW
MIC2295 SEPIC 5V Output
78
76
74
72
70
68
66
64
0
50
100
150
200
250
V
IN
= 3.3V to 5.5V
MBRX140
4.7uH
L2
V
OUT
= 5V @ 0.3A
C4
470pF/
10V
C1
F/
6.3V
Vin=3V
Vin=3.5V
Vin=4V
Vin=5V
Vin=5.5V
VIN
R1
43.2K
MIC2295BML
4
EN
FB
GND
2
3
C2
4.7uF/
6.3V
R2
14.3K
L1 = Murata LQH32CN4R7M23
L2 = Murata LQH32CN4R7M23
OUTPUT CURRENT (mA)
5V MIC2295 SEPIC with on
coupled inductor
80
75
70
65
60
55
50
45
40
35
30
0
50
100
150
200
250
300
V
IN
= 3.5V to 5.5V
5
L1
4.7µH
C3
1µF/16V
1
MBRX140
L1
4.7µH
R1
43.2k
V
OUT
= 5V @ 0.3A
C4
470pF
10V
VIN
SW
C1
4.7µF
6.3V
MIC2295BML
4
EN
GND
FB
3
C2
4.7µF
6.3V
Vin=2.5
V
Vin=3.3
V
Vin=5V
2
R2
14.3k
L1 = Sumida CL5DS 1 1/HP
LOAD CURRENT (mA
MIC2295 12V output Efficiency
90
85
80
75
70
65
60
0
50
100
150
200
Max Duty Cycle vs Input Voltage
100
95
90
85
0.9
1.5
Input Voltage
vs. Supply Voltage
1.3
1.1
Vin=3.3V
Vin=4.2V
Vin=3.6V
OUTPUT CURRENT (mA)
80
0.7
75
0.5
70
2.5
4
5.5
7
8.5
10
2.5
4
5.5
7
8.5
10
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Switch Voltage
vs. Supply Voltage
300
250
200
150
100
50
0
2.5
4.5
6.5
8.5
MIC2295 15V output Efficiency
90
85
80
75
70
65
60
0
50
100
150
200
FEEDBACK VOLTAGE (V)
1.30
1.28
1.26
1.24
Feedback Voltage
vs. Temperature
Vin=3.3V
Vin=4V
Vin=4.2V
OUTPUT CURRENT (mA)
Input Voltage (V)
1.22
1.20
1.18
1.16
1.14
1.12
1.10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
April 2005
5
M9999-042605
(408) 955-1690
嵌入式系统
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