MIC2296
High Power Density 1.2A
Boost Regulator
General Description
The MIC2296 is a 600kHz, PWM dc/dc boost switching
regulator available in a 2mm x 2mm MLF
®
package option.
High power density is achieved with the MIC2296’s
internal 34V / 1.2A switch, allowing it to power large loads
in a tiny footprint. The MIC2296 is a version of the
MIC2295 1.2MHz, PWM dc/dc boost switching regulator,
that offers improved efficiency resulting from 600kHz
operation.
The MIC2296 implements constant frequency 600kHz
PWM current mode control. The MIC2296 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 MIC2296 is available in a low-profile Thin SOT23 5-
pin package and a 2mm x2mm 8-pin MLF
®
leadless
package. The 2mm x 2mm MLF
®
package option has an
output over-voltage protection feature.
The MIC2296 has an operating junction temperature range
of –40°C to +125°C
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
2.5V to 10V input voltage range
Output voltage adjustable to 34V
1.2A switch current
600kHz PWM operation
Stable with small size ceramic capacitors
High efficiency
Low input and output ripple
<1µA shutdown current
UVLO
Output over-voltage protection (MIC2296BML)
Over temperature shutdown
2mm x 2mm leadless 8-pin 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
Positive and negative output regulators
SEPIC converters
Positive to negative Cuk converters
12V supply for DSL applications
Multi-output dc/dc converters
L1
10µH
V
OUT
5V/400mA
1000 pF
10µH
V
OUT
15V/100mA
V
IN
1-Cell
Li Ion
3V to 4.2V
C1
2.2µF
MIC2296BML
SW
VIN
OVP
FB
EN
AGND
PGND
R2
901
MIC2296 BD5
R1
10k
2.2µF
VIN
V
IN
1-Cell
Li Ion
C1
2.2µF
EN
SW
FB
R1
10k
10µF
R2
3.3k
GND
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
January 2010
M9999-011310
Micrel, Inc.
MIC2296
Ordering Information
Part Number
Standard
MIC2296BML
MIC2296BD5*
Lead-Free
MIC2296YML
MIC2296YD5*
Output Over
Voltage Protection
34V
-
Marking Code
Standard
WDA
WDAA
Lead-Free
WDA
WDAA
Junction
Temp. Range
-40°C to 125°C
-40°C to 125°C
Package
8-Pin 2mm x2mm MLF
®
5-Pin Thin SOT-23
* Contact factory for availability.
Pin Configuration
FB GND SW
1
3
2
OVP
VIN
EN
1
2
3
4
EP
8
7
6
5
PGND
SW
FB
NC
4
EN
5
VIN
AGND
TSOT-23-5 (BD5)
8-pin MLF
®
(BML)
Pin Description
MIC2296BD5
Thin SOT-23-5
—
5
4
—
—
3
1
—
2
—
MIC2296BML
2x2 MLF-8L
1
2
3
4
5
6
7
8
—
EP
Pin Name
OVP
VIN
EN
AGND
N/C
FB
SW
PGND
GND
GND
Pin Function
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.
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): 1.24V output voltage sense node. V
OUT
= 1.24V ( 1 +
R1/R2)
Switch Node (Input): Internal power BIPOLAR collector.
Power ground
Ground (Return): Ground.
Ground (Return). Exposed backside pad.
January 2010
2
M9999-011310
Micrel, Inc.
MIC2296
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-8L ..................................................93°C/W
Electrical Characteristics
(4)
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
I
EN
f
SW
V
OVP
T
J
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
Note 5
I
SW
= 0.5A
V
EN
= 0V, V
SW
= 10V
TURN ON
TURN OFF
V
EN
= 10V
V
IN
= 3.6V
MIC2296BML only
Hysteresis
525
30
20
600
32
150
10
1.5
0.4
40
675
34
V
FB
= 2V (not switching)
V
EN
= 0V
(5)
(±1%)
(±2%) (Over Temp)
V
FB
= 1.24V
3V
≤
V
IN
≤
5V
5mA
≤
I
OUT
≤
40mA
90
1.2
1.227
1.215
-450
0.04
0.5
95
1.7
250
0.01
1
2.5
1
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
µA
kHz
V
°C
°C
Notes:
1.
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.
Specification for packaged product only.
I
SD
= I
VIN
.
January 2010
3
M9999-011310
Micrel
MIC2296
Typical Characteristics
84
82
80
78
76
74
72
0
50
100 150 200 250
OUTPUT CURRENT (mA)
V
IN
= 3.2V
V
IN
= 3.6V
12V Output with L = 4.7µH
V
IN
= 4.2V
90
88
86
84
82
80
78
76
74
72
70
5V Output with L = 4.7µH
V
IN
= 4.2V
300
290
280
270
260
250
240
230
220
210
200
Switch Saturation Voltage
vs. Input Voltage
V
IN
= 3.2V
V
IN
= 3.6V
0
200 400 600 800 1000
OUTPUT CURRENT (mA)
10
Input Voltage (V)
800
Frequency
vs. Input Voltage
100
98
96
Max Duty Cycle
vs. Input Voltage
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
2.5
Current Limit
vs. Input Voltage
600
400
94
200
92
90
2.5
0
2.5
5
7.5
INPUT VOLTAGE (V)
10
5
7.5
INPUT VOLTAGE (V)
10
5
7.5
INPUT VOLTAGE (V)
10
12.2
OUTPUT VOLTAGE (V)
12.15
12.1
12.05
12
11.95
11.9
11.85
11.8
0
Load Regulation
FEEDBACK VOLTAGE (V)
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
Feedback Voltage
vs. Temperature
FEEDBACK CURRENT (nA)
700
600
500
400
300
200
100
FB Pin Current
vs. Temperature
V
25
IN
=
3.6V
50 75 100 125 150
LOAD (mA)
1.10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
January 2010
4
M9999-011310
Micrel
MIC2296
Functional Characteristics
Enable Characteristics
Output Voltage
(5V/div)
Output Voltage
(50mV/div)
Step Load Response
Enable Voltage
(2V/div)
V
IN
= 3.6V
V
OUT
= 12V
I
OUT
= 150mA
Load Current
(100mA/div)
V
IN
= 3.6V
V
OUT
= 12V
I
OUT
= 50mA to 150mA
TIME (2µs/div)
TIME (100µs/div)
January 2010
5
M9999-011310
PCB Design
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