AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Features
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Up to 88% Max power efficiency
Wide input voltage range: 2.7V ~ 5.5V
1x, 1.5x, and 2x charge-pump modes
Drive up to 4 white LEDs
Default maximum current setting: 30mA each channel
120mA maximum output current through 4 channels
Programmable switching frequency, default 1.2MHz
Spread Spectrum Control with 10% frequency deviation
1-wire Serial Digital Interface (SDI) or PWM for dimming
control
Soft-start during power-up and mode switching
Soft-stop during shutdown
Short-circuit protection
Over-voltage protection and under-voltage lockout
Low shutdown current < 6
µ
A
Industry-leading low profile package
DFN3030-12: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish / RoHS Compliant (Note 1)
General Description
The AP3154 is a high efficiency charge-pump white LED driver
with 1x, 1.5x, 2x operating modes. The AP3154 operates on
power supplies from 2.7v to 5.5v. It drives up to four channels of
white LEDs while the intensity of each channel is configured by
varying the respective current levels. Each channel can supply up
to 30mA current. Up to four channels can be ganged together to
provide maximum load current of 120mA.
The Serial Digital Interface (SDI) provides the capability to
configure the current for each LED channel. Some other key
features, such as Up Spread Spectrum Control, different
charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz),
and PWM dimming control, can also be programmed through the
interface.
The AP3154 has a built-in soft-start circuit to minimize the inrush
current during power-up and mode switching. Various protections
such as short-circuit, over-voltage, under-voltage, and thermal
shutdown are integrated to ensure system reliability. The
quiescent current of AP3154 during shutdown is less than 6
µ
A.
Applications
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Mobile Phone
PDA (Personal Digital Assistant)
White LED Backlighting
Camera Flash LED Lighting
LCD Modules
Portable Devices
Ordering Information
AP 3154 F G - 7
Package
F : DFN3030-12
Device
AP3154FG-7
Notes:
Green
G : Green
Packing
7 : Tape & Reel
Package Code
F
Packaging
(Note 2)
DFN3030-12
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
AP3154 Rev. 2
1
of
13
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FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Pin Assignment
( Top View )
D4
SDI
C1
P
C1
N
V
OUT
C2
P
1
2
3
4
5
6
12
11
D3
D2
D1
GND
V
IN
C2
N
Exposed
Pad
10
9
8
7
DFN3030-12
Pin Descriptions
Pin Name
D4
SDI
C1
P
C1
N
V
OUT
C2
P
C2
N
V
IN
GND
D1
D2
D3
GND
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
EP PAD
Description
Current Sink Input #4. Connect to V
OUT
when un-used.
1-wire Serial Digital Interface Input / PWM input
Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C1
P
and
C1
N
.
Negative Terminal of Flying Capacitor.
The charge pump output voltage to drive load circuit. Connect a 1µF capacitor
between this pin and ground.
Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C2
P
and
C2
N
.
Negative Terminal of Flying Capacitor.
Input Power Source. Connect a 1µF capacitor between this pin and ground.
Ground.
Current Sink Input #1. Connect to V
OUT
when un-used.
Current Sink Input #2. Connect to V
OUT
when un-used.
Current Sink Input #3. Connect to V
OUT
when un-used.
Exposed Pad (bottom). Connect to ground underneath the package.
AP3154 Rev. 2
2
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13
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FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Block Diagram
C2
P
C2
N
C1
P
C1
N
V
OUT
V
IN
CHARGE PUMP
SWITCHES
SHORT
CIRCUIT
PROTECTION
OVER
VOLTAGE
PROTECTION
SDI
SERIAL
DIGITAL
INTERFACE
DIGITAL
CONTROL
BLOCK
OUTPUT VOLTAGE REGULATION
&
LED SHORT CIRCUIT DETECTION
BANDGAP
OSCILLATOR
D1
D2
D3
OVER
TEMPERATURE
PROTECTION
UNDER
VOLTAGE
LOCKOUT
CURRENT
CONTROL
D4
GND
Typical Application Circuit
V
IN
1uF
C
IN
8
V
IN
C2
P
6
1uF
C
2
1uF
C
1
7
C2
N
3
C1
P
C1
N
AP3154
4
V
OUT
5
D4
LED
D3
LED
D2
LED
D1
LED
1uF
C
OUT
SDI
2
SDI
GND
9
D4
D3
D2
D1
1
12
11
10
AP3154 Rev. 2
3
of
13
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FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Absolute Maximum Ratings
Symbol
ESD HBM
ESD MM
(Notes 3)
Description
Human Body Model ESD Protection
Machine Model ESD Protection
Input Voltage
SDI to GND Voltage
Maximum DC Output Current
Maximum Power Dissipation
Operating Junction Temperature Range
Value
2
200
-0.3 to 6
-0.3 to V
IN
+ 0.3
150
0.85
-40 to 150
Units
KV
V
V
V
mA
W
°C
V
IN
VSDI
I
OUT
P
D
T
J
Notes:
3.
Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol
V
IN
T
A
Input Voltage
Operating Ambient Temperature
Parameter
Min
2.7
-40
Max
5.5
85
Units
V
°C
AP3154 Rev. 2
4
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13
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FEBRUARY 2009
©
Diodes Incorporated
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Electrical Characteristics
C
IN
= C
OUT
= C1 = C2 = 1.0µF;
T
A
= 25°C, V
IN
= 3.5V. Unless otherwise stated.
Symbol
Description
Conditions
Min
Typ.
1X Mode
I
Q
Quiescent Current
Fosc=1.2MHz,
1.2
SDI=HIGH, no load
I
SHDN
Shutdown Current
SDI = 0
0.3
I
SINK
Current Accuracy
I
SINK
= 20mA
I
DX
-10
(Note 4)
Current Matching
V
F
: D1=D2=D3=D4
I
D-Match
I
D
= 2, 20mA
(Note 5)
T
SS
Soft-start Time
1
F
CLK
Switching Clock Frequency
0.6/1.2/1.8
F
SSP
Spread Spectrum
Enabled
+10
V
SDI(L)
SDI Threshold Low
V
IN
= 2.7V to 5.5V
V
SDI(H)
SDI Threshold High
V
IN
= 2.7V to 5.5V
1.6
T
SLO
SDI Low Time
0.05
T
SHI
SDI High Time
0.05
PWM Frequency (Range 1)
0.2
f
PWM
PWM Frequency (Range 2)
20
T
PWM
PWM Signal Period
1/ f
PWM
-Max
T
PLO
PWM Signal Low (LED off)
1
T
PHI
PWM Signal High (LED on)
1
PWM
65
T
OFF
Chip Disable (held low)
No PWM
512
PWM
65
Interval between SDI
T
SEP
sequences (held high)
No PWM
512
I
SDI
SDI Input Leakage
-1
V
OUT
Short to GND hold
I
SCP
500
Current
Thermal Resistance1 –
DFN3030-12
θ
JA
160
Junction to Ambient
(Note 6)
Maximum Thermal
DFN3030-12
θ
JC
Resistance1 –
21
(Note 6)
Junction to Case
Notes:
4. Determined by the average current levels of all active channels.
5. Defined as the deviation of any sink current from the average of all active current channels.
6.
Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
Max
Units
mA
6
10
5
µA
%
%
ms
MHz
%
V
V
µs
µs
KHz
KHz
µs
µs
µs
ms
µs
ms
µs
µA
mA
°C/W
°C/W
0.4
50
50
1.5
30
1/ f
PWM
-Min
T
PWM
– 1
T
PWM
– 1
100
800
100
800
1
AP3154 Rev. 2
5
of
13
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
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