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PAM2701 Schematic ( PDF Datasheet ) - Power Analog Micoelectronics

Teilenummer PAM2701
Beschreibung 4-Channel Regulated Charge Pump White LED Driver
Hersteller Power Analog Micoelectronics
Logo Power Analog Micoelectronics Logo 




Gesamt 14 Seiten
PAM2701 Datasheet, Funktion
PAM2701
4-Channel Regulated Charge Pump White LED Driver
Features
n Peak Efficiency: 90%
n Individual Current Regulation
n 3-bit Digital Output Control
n Two modes of operation:1x and 1.5x
n Current Matching with a Max Tolerance
of 3%
n Output Current up to 30mA per LED
n Total LED Current up to 4*30mA=120mA
n Fixed Frequency of 1MHz
n Open LED Protection
n Space Saving Package QFN 3mmx3mm
and QFN 4mmx4mm
n Pb-Free Package
Applications
n Cellular Phones
n LED Backlighting
n LCD Modules
n Handheld Devices
n Digital Cameras
n PDAs
n PMPs
n MP3 Players
Description
The PAM2701 is a 4-channel charge pump white
LED driver, capable of driving up to 4 LEDs in
parallel. The device operates in either 1x mode or
1.5x fractional mode, and it can switch from 1x
mode to 1.5x mode automatically when the input
voltage decreased. Its internal 4 current sink
regulators ensure both the LED current matching
and the brightness uniformity. The LED current
can be programmed by an external resistor, R ,SET
connected between the RSET pin and ground.
LED current of up to 30mA are supported by the
input supply voltage over a range of 2.7V to 5.5V,
making the device optimized for Li-Ion battery
applications.
The PAM2701 has a fixed switching frequency of
1MHz, allowing the use of very small value
ceramic capacitors. The enable input pin allows
the device to be set in shutdown mode, and the
current consumption is reduced to less than 1μA.
LED dimming can be done by several methods
including using a DC voltage to set the RSET pin
current, adding a switched resistor in parallel with
RSET, or applying a PWM signal to CTRx pin or EN
pin.
Typical Application
www.DataSheet4U.com
VIN
EN
CIN
1μF Control 0
Control 1
Control 2
RSET
24kΩ
1μF 1μF
8 9 11 10
C1+ C1- C2+ C2-
76
VIN
VOUT
1 EN PAM2701
2
CTR0
3
CTR1
4 CTR2
5 RSET
GND
LED1 16
15
LED2
14
LED3
13
LED4
12
Co
1μF
20mA
Power Analog Microelectronics,Inc
www.poweranalog.com
1
09/2008 Rev 1.3






PAM2701 Datasheet, Funktion
PAM2701
4-Channel Regulated Charge Pump White LED Driver
Typical Characteristics
VIN = 3.6V, EN = V ,IN RSET = 24kΩ, C =IN CO=1μF,TA = 25°C, unless otherwise noted.
1. Efficiency vs Input Voltage (4 LEDs)
2. Efficiency vs Output Current (4 LEDs)
100 100
90 90
80 80
70 70 VIN=4.2V
60
50 15mA per LED
20mA per LED
60
50
VIN=3.2V
40
2.4
3 3.6 4.2 4.8
Input Voltage (V)
5.4
40
10
40 70 100 130
Output Current (mA)
160
3. LED Current vs Input Voltage (4 LEDs)
24
22
20 20mA per LED
18
16
14
12 15mA per LED
10
2.8
3.1
www.DataSheet4U.com
3.4 3.7
Input Voltage (V)
4
4.3
5. Ground Current vs Input Voltage
3.00
2.50
2.00
1.5X Mode
1.50
1.00 1X Mode
0.50
0.00
2.8
3.1 3.4 3.7
Input Voltage (V)
4
4.3
4. Supply Current vs Input Voltage (4 LEDs)
140
120
100 20mA per LED
80
60
40 15mA per LED
20
0
2.4
3 3.6 4.2 4.8
Input Voltage (V)
5.4
6. Oscillator Frequency vs Input Voltage
1.1
1.05
1
0.95
0.9
2.8
3.2 3.6
Input Voltage (V)
4
4.4
Power Analog Microelectronics,Inc
www.poweranalog.com
6
09/2008 Rev 1.3

6 Page









PAM2701 pdf, datenblatt
PAM2701
4-Channel Regulated Charge Pump White LED Driver
Ordering Information
PAM2701 X X X
Shipping Package
Pin Number
Package Type
Package Type
J: QFN 3mmx3mm
K: QFN 4mmx4mm
Pin Number
E: 16
Part Number
PAM2701JER
PAM2701KER
Package Type
Thin QFN-16 3mm×3mm
Thin QFN-16 4mm×4mm
Shipping Package
R: Tape & Reel
MOQ
3,000 Units/Tape & Reel
3,000 Units/Tape & Reel
www.DataSheet4U.com
Power Analog Microelectronics,Inc
www.poweranalog.com
12
09/2008 Rev 1.3

12 Page





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