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PT4301 Datasheet Preview

PT4301 Datasheet

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

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PT4301, PT4303
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
GENERAL DESCRIPTION
The PT4301/03 is a 4-channel 1x/1.5x auto-adjust charge pump white LED driver that achieves high efficiency for
Li-Ion battery supply. The LED current can be set by an external resistor. Only one small resistor and four 1µF small
ceramic capacitors are needed as external components to construct a LED driver, which makes the PT4301/03 an ideal
choice for portable applications. The LED fault detection circuit in the PT4301/03 improves the reliability of the system.
The PT4301/03 has three dimming modes that allow users to adjust the brightness of the four LEDs individually or
all together. The first two dimming modes can be controlled through the EN/SET pin either by applying a serial digital
code, in which case the LED currents can be set with eight levels of up to 20mA, or by providing a
pulse-width-modulation (PWM) signal input. The third dimming mode relies on the feature that the four LEDs can be
turned on and off selectively by a three-bit digital code at the three control inputs in the PT4301, or a two-bit digital code
at the two control inputs in the PT4303. Therefore, individual dimming control can be realized by applying PWM signals
at those control inputs. The built-in soft-start circuit eliminates the inrush current during power on and 1x/1.5x mode
switching. Thermal shut down and current limiter prevent the PT4301/03 from being damaged by high level current
through the device. The ultra small shutdown current of less than 1µA extends the battery life significantly. The
PT4301/03 is available in a QFN-16 package.
FEATURES
z 1×/1.5× auto-adjust charge pump
z LED current set by external resistor
z Programmable 4-channel LED current up to 20mA
with 8 levels control through en/set pin
z Individual LED dimming control through PWM
signals at 3 (PT4301) or 2 (PT4303) control inputs
z LED fault detection
z <3% channel to channel current mismatch
z Less than 1uA shut down current
z Built-in soft-start and soft mode switching
APPLICATIONS
z Cell Phones
z Handheld Computers and PDAs
z Digital Cameras
z Small LCD Displays
z Programmable current sink
TYPICAL APPLICATIONS
BLOCK DIAGRAM
C1 1uF
C2 1uF
3V to 5.5V
Cin 1uF
Control
bit 0-2
C1n C1p C2n C2p
Vin Vout
PT4301
En/sePt TP4T3403301
LED1
LED2
Ctrl0
Ctrl1
NCCt.rCtlr2.l2((PPTT4433G0031n))d
LED3
LED4
Iset
Cout
1uF
Rset(24K)
Vin
En/Set
Ctrl0
Ctrl1
Ctrl2
C1+ C1- C2+ C2-
Current
Limiter
Digital
Interface
Charge
pump
Switches
1×/1 5×
Current
Reference
+
Vout
Led1
Led2
Led3
Thermal Soft
Shutdown Start
Led4
LED
control
code
+
Gnd
www.micro-bridge.com
PT4301_DSB Rev EN_1.0,
Page 1




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PT4301 Datasheet Preview

PT4301 Datasheet

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

No Preview Available !

PACKAGES
QFN16(4X4mm)
LED4 13
LED3 14
LED2 15
LED1 16
PPTT44330011
PT4303
8 C1p
7 Vin
6 Vout
5 Iset
PT4301, PT4303
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
PIN DESCRIPTIONS
Names
Pin No.
Description
1
En/set
Chip enable and programming pin
2 to 3
Ctrl0 to 1
LED current control bit 0 to 1
4 Ctrl2 (PT4301) LED current control bit 2 for PT4301
N.C. (PT4303) Unconnected for PT4303
5 Iset LED currents pre-set Pin
6 Vout Output voltage source
7 Vin Power supply
8 C1p Positive terminal of fly capacitor 1
9 C1n Negative terminal of fly capacitor 1
10 C2n Negative terminal of fly capacitor 2
11 C2p Positive terminal of fly capacitor 2
12 Gnd Ground
13 to 16
LED1 to 4 Current sink for LED
ELECTRICAL CHARACTERISTICS
VDD=3.5V, , C1=C2=Cin=Cout=1µF, TA=25, unless specified otherwise.
SYMBOL
ITEMS
Input Characteristics
VIN Input Voltage
IOFF Operating CurrentShutdown
Iq Operating CurrentQuiescent
IOLP Over Load Protection
Charge Pump
CONDITIONS
En/Set=0
No load Current
Short vout to gnd
Min.
Typ.
Max.
UNIT
3 5.5 V
0.1 1
µA
1.5 3
mA
600 mA
FCLK Switching Frequency
TSS Soft-start time
V15-1
The Threshold of 1.5X-> 1X
V1-15
The Threshold of 1X-> 1.5X
Output Characteristics
VLED1=VLED2=3.5V, ILED=25mA
VLED1=VLED2=3.5V, ILED=25mA
0.6 1 1.4 MHz
550 µs
4V
3.8 V
IOUT Maximum LED output current
3.0<vin<5.5, VLED=3.5V, en/set set the
18
20
22 mA
output to maximum current, and
Rset=24KΩ
IMatch(note1)
Current match between D1, D2, D3 and D4
3.0<vin<5.5output maximum current
3%
Vovp Over output voltage protection
Vin=4, Open all led
5.5 V
Chip Enable
VIL En/Set, Ctrl0Ctrl1, Ctrl2 Maximum Low Level Vin=5
1.4 V
Threshold
VIH
II
Tctrl
En/Set, Ctrl0 to 2 Minimum high level threshold
En/Set, Ctrl0Ctrl1, Ctrl2 Input Current
Ctrl0 to 2 minimum pulse width when dimming
with PWM signal
Vin=5
Vin=Ven/set=VCtrl0=VCtrl1=VCtrl2=5V
1.8 V
-1 1 uA
100 us
TsetL
En/Set low level width
0.3 75 us
TsetH
En/Set high level width
50 ns
Toff
Thermal
En/Set shut down low level width
500 us
TSD Thermal Shut Down Threshold
THY Thermal Shut Down Hysteresis
Note1: IMatch=|ΔILEDmax/ILEDavg |×100%
Temperature rise
150 160 170
10
oC
oC
www.micro-bridge.com
PT4301_DSB Rev EN_1.0,
Page 2


Part Number PT4301
Description 4 Channel 1x/1.5x Auto-Adjust Charge Pump White LED Driver
Maker Powtech
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PT4301 Datasheet PDF






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