2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
1
CM9156A
PRELIMINARY
Features
3.0V to 6.5V input voltage range
Dual mode operation: 1x and 1.5x
Fixed 4.5V output with initial accuracy of 2%
Supports up to 180mA (@4V) output
High efficiency at both high and low input voltages
Low external parts count, requires no inductor
PWM brightness control via the ENA pin
Selectable 8kHz, 32kHz, 262kHz, and 650kHz
switching frequency
Low shutdown current of <1A
Soft start prevents excessive inrush current
Over-temperature and over-current protection
Low output ripple (<1%), low EMI
Input protection provides superior ESD rating
requiring only standard handling precautions
TDFN-10 or MSOP-10 package
Optional RoHS compliant lead free packaging
Applications
Drives white LEDs to backlight color LCDs
Drives white or RGB LEDs for camera flash
Cellular phones
MP3 players
PDAs, GPS
Product Description
The CM9156A is an efficient, 1.5x switched capacitor
(charge pump) regulator ideal for white LED applica-
tions. It has a regulated 4.5V, 120mA output, capable
of driving up to six parallel white LEDs. With a typical
operating input voltage range from 3.0V to 6.0V, the
CM9156A can be operated from a single-cell Li-Ion
battery.
It features an efficient, 1.5x charge pump circuit that
uses only two 1.0F ceramic bucket capacitors and two
small capacitors for VIN and VOUT. The CM9156A
offers a selectable switching frequency of 8kHz, 32kHz,
262kHz, or 650kHz. The LED brightness can be
adjusted by applying a PWM signal on the ENA pin.
The CM9156A output voltage is regulated to 4.5V,
5% over the line and load ranges. Up 180mA of output
current is available. The proprietary design architecture
maintains high efficiency (> 80%), and at low V
IN
pro-
vides longer battery life. With a high V
IN,
or when the
adapter is powered, it provides cool reliable operation.
It offers low output voltage ripple, typically less than
50mV. Internal over-temperature and over-current
management provide short circuit protection.
The CM9156A is packaged in either a space saving
10-Lead TDFN or 10-Lead MSOP
package. It can
operate over the industrial temperature range of -25
C
to 85
C.
Charge Pump White LED Driver
1.0uF
1.0uF
4.5V
3.0V to 6.0V
1.0uF
C 1P
V OUT
V IN
C L K2
C L K1
C 1N
C 2P
GND
ENA
C 2N
CM9156A
1.0uF
30
30
30
PhotonIC
TM
Typical Application
2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
04/26/06
CM9156A
PRELIMINARY
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
PACKAGE / PINOUT DIAGRAM
Note: This drawing is not to scale.
CMxxx
GND
4
3
2
1
4
3
2
1
6
7
8
9
PAD
xxxxxx
7
8
9
10
6
5
5
10
Pin 1
Marking
BOTTOM VIEW
(Pins Up View)
TOP VIEW
(Pins Down View)
CM9156A-01DE
10 Lead TDFN Package
1
2
3
4
10
9
8
7
VOUT
C1P
VIN
CLK1
C2P
C1N
GND
C2N
TOP VIEW
5
6
CLK2
ENA
CM9156A-01MR
10 Lead MSOP Package
PART NUMBERING INFORMATION
Pins
Package
Lead-free Finish
Ordering Part Number
1
Part Marking
10
TDFN
CM9156A-01DE
10
MSOP
CM9156A-01MR
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
2
kV
VIN to GND
[GND - 0.3] to +6.5
V
Pin Voltages
V
OUT
to GND
C1P, C1N to GND
C2P, C2N to GND
ENA, CLK1, CLK2 to GND
[GND - 0.3] to +6.0
[GND - 0.3] to +4.5
[GND - 0.3] to +4.5
[GND - 0.3] to +6.0
V
V
V
V
Storage Temperature Range
-65 to +150
C
Operating Temperature Range
-40 to +85
C
Lead Temperature (Soldering, 10s)
300
C
Package Pinout
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
3
CM9156A
PRELIMINARY
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V. Typical values are at TA = 25 C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
S
V
IN
VIN Supply Voltage
3.0
6.0
V
I
SD
Shut-Down Supply Current
ENA = 0
1
A
I
Q
Quiescent Current
Fs = 8 kHz
Fs = 32 kHz
Fs = 262 kHz
Fs = 650 kHz
250
280
800
1600
380
470
1200
2500
A
A
A
A
Charge Pump Circuit
V
R LOAD
Load Regulation
Fs = 262 kHz or 650 kHz,
Iout = 0 mA to 120 mA,
Vin = 3.2V to 6.5V
Iout = 0 mA to 90 mA,
Vin = 3.0V to 3.2V
4.2
4.0
4.5
4.1
4.7
4.2
V
V
V
R LIN
Line Regulation
Fs = 262 kHz or 650 kHz,
Iout = 60 mA,
Vin = 3.2V to 6.5V
Vin = 3.0V to 3.2V
4.4
4.0
4.5
4.1
4.6
4.3
V
V
I
OUT
Output Current
Vout = 4.5V
Vout = 4.0V
120
180
mA
mA
V
OUTR
Output Ripple Voltage
Fs = 262 kHz, Iout = 60 mA
50
mV
fs
Switching Frequency
CLK1 = 0, CLK2 = 0
CLK1 = 1, CLK2 = 0
CLK1 = 0, CLK2 = 1
CLK1 = 1, CLK2 = 1
32.8
8.2
262
650
kHz
kHz
kHz
kHz
CLK1, CLK2
High Level Input Voltage
1.2
V
Low Level Input Voltage
0.6
V
ENA
V
IH
High Level Input Voltage
1.3
V
V
IL
Low Level Input Voltage
0.4
V
Protection
I
LIM
Over-current Limit
400
600
mA
T
JSD
Over-temperature Limit
135
C
T
HYS
Over-temperature Hysteresis
15
C
Specifications (cont'd)
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
CM9156A
PRELIMINARY
C
IN
=C
OUT
=C
1
=C
2
=1.0
F
,
T
A
=25C
, unless specified otherwise
Switching Frequency - 8kHz
7.5
7.8
8.0
8.3
8.5
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
Input Voltage (V)
Fr
e
que
nc
y
(
k
H
z
)
85C
20C
- 40C
Switching Frequency - 650kHz
610
630
650
670
690
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
Input Voltage (V)
Fr
e
que
nc
y
(
k
H
z
)
-40C
20C
85C
Switching Frequency - 32kHz
30
31
32
33
34
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
Input Voltage (V)
Fr
e
q
ue
nc
y
(
k
H
z
)
85C
20C
- 40C
Switching Frequency - 262kHz
246
254
262
270
278
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
Input Voltage (V)
Fr
e
que
nc
y
(
k
H
z
)
85C
20C
- 40C
Vout vs. Temperature
4.450
4.475
4.500
4.525
4.550
-40
-15
10
35
60
85
Temperature (C)
V
out
(
V
)
Vin = 3.6V
No Load Input Current
400
800
1200
1600
2000
3.2
3.6
4.0
4.4
4.8
5.2
5.6
6.0
Vin (V)
Iq
(
A)
650kHz
262kHz
32kHz
8.2kHz
Typical Performance Curves (cont'd)
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