Diodes PAM2812 Schematic [ru]
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Description
The PAM2812 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 EN PWM dimming techniques.
The PAM2812 is available in SOT23-6L package.
Features
4-CHANNEL LOW DROPOUT CURRENT SINK
Pin Assignments
Product Line o
Diodes Incorporated
PAM2812
• Support up to 4 LEDs
• LED sink current 20mA
• Low Dropout Voltage
• Low Quiescent Supply Current:330µA(typ)
• No Noise and EMI
• Shutdown Current Less than 1µA
• Over Temperature Protection
• Small Package: SOT23-6L
• RoHS Compliant and Green Package
Typical Applications Circuit
Applications
• Mobile Phone
• Digital Camera
• PDA,MP3,MP4
PAM2812
Document number: DSxxxxx Rev. 1 - 0
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October 2012
© Diodes Incorporated
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Pin Descriptions
Pin
Number
1 EN
2 GND
3 LED4
4 LED3
5 LED2
6 LED1
Pin
Name
Enable Pin. Active high.
Ground
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.
Functional Block Diagram
Product Line o
Diodes Incorporated
PAM2812
Function
Absolute Maximum Ratings (@T
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
EN Voltage Range -0.3 to +6.0 V
Input Voltage Range -0.3 to +6.0 V
The Other Pins -0.3 to +6.0 V
Maximum Junction Temperature 150
Storage Temperature -65 to +165
Soldering Temperature 300, 5sec
PAM2812
Document number: DSxxxxx Rev. 1 - 0
= +25°C, unless otherwise specified.)
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°C
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Product Line o
Diodes Incorporated
PAM2812
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
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Parameter Rating Unit
EN Voltage Range 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
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
Internal Power Dissipation
Electrical Characteristics (Note 1) (@T
Parameter Symbol Test Conditions Min Typ Max Units
Operation Voltage Range
LED Sink Current
LED Current Matching All LEDs 100% setting 5 %
LED Dropout Voltage
Quiescent Current
Shutdown Current
Startup Time
EN Input Logic High
EN Input Logic Low
Thermal Shutdown Temperature
Hysteresis Temperature 30 °C
Note: 1. Recommend EN pin maximum PWM dimming frequency is 1Khz. Recommended EN pin minimum PWM dimming pulse width is 100µs.
PAM2812
Document number: DSxxxxx Rev. 1 - 0
SOT23-6L
SOT23-6L
SOT23-6L
= +25°C, VIN = 3.6V, unless otherwise specified.)
A
V
I
V
T
V
V
LED
I
I
SD
T
EN
All LEDs 100% setting
I
DO
Q
LED
I
LED
VEN = 0V
3 µs
ON
2.7 V
HI
0.4 V
LO
150 °C
P
θ
θ
P
= 20mA
= 0
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250
130
°C/W
400 mW
2.7 5.5 V
18 20 22 mA
180 mV
330 500 µA
1 µA
October 2012
© Diodes Incorporated
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