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PT4303 Datasheet Preview

PT4303 Datasheet

1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver

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PT4303
1x/1.5x Auto-Adjust Charge Pump
4-Channel White LED Driver with Two Dimming Modes
GENERAL DESCRIPTION
The PT4303 is a 4-channel 1x/1.5x auto-adjust charge
pump white LED driver with two dimming modes.
Auto-adjust charge pump achieves high efficiency for
Li-Ion battery supply. The two LED dimming modes
enable users to dim the four LEDs all together or
individually. Only a few external components (two
flying capacitors and two filter capacitors at VIN and
VOUT) are needed, which makes the PT4303 ideally
suited for mobile applications.
The current through the LED can be set by an external
resistor. The four LEDs can be turned on and off
individually or in a group of two to four through the
two control terminals, which can also be used to dim
the LEDs by applying PWM control signals.
Built-in soft-start circuit prevents the inrush current
from the power supply during power on and 1x/1.5x
mode change. The thermal shutdown and current
limiter prevent the PT4303 from being damaged by a
high-level current through it. A shutdown current of less
than 1uA makes the battery last longer. The PT4303 is
available in QFN-16 package.
FEATURES
z 3V-5.5V input voltage
z 1x/1.5x auto-adjust charge pump
z Set LED current by external resistor
z Dimming LED by PWM signal through 2
control terminal
z LED fault detection
z <3% current mismatch
z No inductor
z Less than 1uA shutdown current
z Built-in soft-start and soft mode decision
APPLICATIONS
z Cell phones
z Laptop computers and PDAs
z Digital cameras
z Small LCD displays
ORDERING INFORMATION
PACKAGE
TEMPERATURE
RANGE
ORDERING PART
NUMBER
QFN-163x3
-40 oC to 85 oC
PT4303EQFN
Note:
xxxxxX
Assembly Factory Code
Lot Number
TYPICAL APPLICATION CIRCUIT
C1 1uF C2 1uF
TRANSPORT
MEDIA
Tape and Reel
3000 units
MARKING
PT4303
xxxxxX
C1 1uF C2 1uF
3V to 5.5V
CIN 1uF
Control
bit 0-1
C1N C1P C2N C2P
VIN VOUT
EN
CTRL0
CTRL1
GND
LED1
LED2
LED3
LED4
ISET
COUT
1uF
RSET(24K)
3V to 5.5V
CIN 1uF
Control
bit 0-1
C1N C1P C2N C2P
VIN VOUT
EN
CTRL0
CTRL1
GND
LED1
LED2
LED3
LED4
ISET
COUT
1uF
RSET(24K)
Figure 1. Li-Ion Battery Driving 4 White LEDs
Figure 2. Li-Ion Battery Driving 3 White LEDs
China Resources Powtech (Shanghai) Limited
PT4303_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 1




Powtech

PT4303 Datasheet Preview

PT4303 Datasheet

1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver

No Preview Available !

PT4303
1x/1.5x Auto-Adjust Charge Pump
4-Channel White LED Driver with Two Dimming Modes
PIN ASSIGNMENT
LED4 13
LED3 14
LED2 15
LED1 16
PT4303
8 C1P
7 VIN
6 VOUT
5 ISET
Figure 3. QFN16(3x3) Top View
PIN DESCRIPTIONS
QFN16
PIN No.
1
2 to 3
5
6
7
8
9
10
11
4, 12
13 to 16
PIN
NAMES
EN
CTRL0 to 1
ISET
VOUT
VIN
C1P
C1N
C2N
C2P
GND
LED1 to 4
DESCRIPTION
Chip enable pin
LED current control bit 0 to 1, (See table 1)
LED currents are set by the resister Rset connected from the Iset pin to
ground. The pin must not be shorted to ground because its voltage is set
internally to 1.22V.
Output voltage source connecting to the 1uF ceramic capacitor’s positive and
LED’s anodes.
Power supply
Positive terminal of fly capacitor 1
Negative terminal of fly capacitor 1
Negative terminal of fly capacitor 2
Positive terminal of fly capacitor 2
Ground
Current sink for LED
ABSOLUTE MAXIMUM RATINGS (Note 1)
SYMBOL
VIN
VOUT
VEN, VCTRL0~1
PTR
PDMAX
TJ
Tstg
Tsolder
ITEMS
Input Voltage
Output Voltage
The voltage of EN, CTRL0, and CTRL1 pin voltage
Thermal Resistance, QFN-16 (3x3)
Power Dissipation (Note 2)
ΘJA
Operation Junction Temperature Range
Storage Temperature
Package Lead Soldering Temperature
ESD Susceptibility (Note 3)
VALUE
-0.3~6
-0.3~6
GND-0.3 ~VIN+0.3
68
Internally Limited
-40 to 150
-55 to 150
260, 10s
2
UNIT
V
V
V
/W
W
kV
China Resources Powtech (Shanghai) Limited
PT4303_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 2


Part Number PT4303
Description 1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver
Maker Powtech
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PT4303 Datasheet PDF






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