Diodes PAM2811 User Manual
A
f
Description
The PAM2811 provides 4 regulated current sinks, capable of sinking
up to 20mA current to accommodate 4 white LEDs. It requires no
charge pump, has no noise and EMI, and significantly improves the
efficiency in Li battery range.
LED brightness can be controlled by single-wire dimming
techniques. The constant current sink is set by16-step.
The PAM2811 is available in QFN3x3-16L, MSOP-8L, SOT23-8L
and DFN2x2-8L packages.
Features
4-CHANNEL SINGLE-WIRE DIMMING LED DRIVE
with ULTRA LOW DROPOUT CURRENT SINK
Pin Assignments
Product Line o
Diodes Incorporated
PAM2811
Support up to 4 LEDs
LED Sink Current 20mA
Low Dropout Voltage
Low Quiescent Supply Current:270µA(typ)
No Noise and EMI
Shutdown Current Less than 1µA
Over Temperature Protection
16-Step Brightness Control
Small Package: QFN3x3-16L,MSOP-8L SOT23-8L,
DFN2X2-8L
Pb-free Package
Applications
Mobile Phone
Digital Camera
PDA MP3
Typical Applications Circuit
PAM2811
Document number: DSxxxxx Rev. 1 - 0
1 of 13
www.diodes.com
November 2012
© Diodes Incorporated
A
f
Product Line o
Diodes Incorporated
PAM2811
Pin Descriptions
Pin
Name
QFN3x3-16L
P2811A
QFN3x3-16L
P2811B
NC 1 2 — — —
NC 2 3 — 2 —
NC 3 4 — — —
NC 4 5 — — —
AGND 5 — 4 3 4
PGND 6 12 1 — 1
VIN
VIN 7 —
7
EN 8 1 2 4 2
NC 9 8 — — —
LED4 10 13 8 8 5
LED3 11 14 7 7 6
LED2 12 15 6 6 7
LED1 13 16 5 5 8
NC 14 9 — — —
NC 15 10 — — —
NC 15 11 — — —
PAM2811
Document number: DSxxxxx Rev. 1 - 0
Pin Number
MSOP-8L
P2811C
6
SOT23-8
P2811D
3
DFN2x2-8L
P2811E
1
www.diodes.com
3
2 of 13
Not Connected
Not Connected
Not Connected
Not Connected
Analog Ground
Power Ground
Supply Input
Supply Input
Enable Pin. Active high, with an internal 150kΩ pull-down
resistor.
Not Connected
LED4 Pin, Connect to the LED cathode, leave it to
connect GND or open if unused.
LED3 Pin, Connect to the LED cathode, leave it to
connect GND or open if unused.
LED2 Pin, Connect to the LED cathode, leave it to
connect GND or open if unused.
LED1 Pin, Connect to the LED cathode, leave it to
connect GND or open if unused.
Not Connected
Not Connected
Not Connected
Function
November 2012
© Diodes Incorporated
A
f
Functional Block Diagram
Product Line o
Diodes Incorporated
PAM2811
PAM2811
Document number: DSxxxxx Rev. 1 - 0
3 of 13
www.diodes.com
November 2012
© Diodes Incorporated
A
f
Product Line o
Diodes Incorporated
PAM2811
Absolute Maximum Ratings (@T
= +25°C, unless otherwise specified.)
A
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.
Parameter Rating Unit
Input Voltage Range -0.3 to +6.0
PWM Pin Voltage
-0.3 to (V
+0.3)/+6
IN
V
Maximum Junction Temperature 150
Storage Temperature -65 to +150
°C
Soldering Temperature 300, 5sec
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
A
Parameter Rating Unit
Input Voltage 2.7 to 5.5 V
Junction Temperature Range -40 to +125
Ambient Temperature Range -40 to +85
°C
Thermal Information
Parameter Package Symbol Max Unit
QFN3x3-16L
Thermal Resistance (Junction to Ambient)
MSOP-8L 180
SOT23-8 250
θ
JA
DFN2x2-8L 80
QFN3x3-16L
Thermal Resistance (Junction to Case)
MSOP-8L 75
SOT23-8 130
θ
JC
DFN2x2-8L 20
Electrical Characteristics (@T
= +25°C, VIN = 3.6V, unless otherwise specified.)
A
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage
Output Current
V
I
LED
IN
All LEDs 100% setting
Current Matching All LEDs 100% setting -3 +3 %
LED Dropout Voltage
Quiscent Current
Shutdown Current
Startup Time
EN Input Logic High
EN Input Logic Low
EN Low Time for Dimming
EN High Time for Dimming
Shutdown Delay Time
Thermal Shutdown Temperature
V
I
DO
I
I
Q
I
VEN = 0V, VIN = 5.5V
SD
T
ON
V
HI
V
LO
T
LO
T
HI
T
VEN = 0V
OFF
T
P
= 20mA
LED
= 0
LED
30 µs
1.5 V
0.4 V
0.5 500 µs
0.5 µs
150 °C
Hysteresis Temperature 30 °C
PAM2811
Document number: DSxxxxx Rev. 1 - 0
4 of 13
www.diodes.com
35
14
°C/W
2.7 5.5 V
18 20 22 mA
60 mV
270 µA
0.1 1.0 µA
1000 2000 µs
November 2012
© Diodes Incorporated
Loading...