900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Powtech

PT4302 Datasheet Preview

PT4302 Datasheet

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

No Preview Available !

PT4302
2 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
GENERAL DESCRIPTION
The PT4302 is a 2-channel 1×/1.5× auto-adjust charge pump white LED driver with LED fault detection. The
auto-adjust charge pump achieves high efficiency for an Li-lion battery supply. LED fault detection feature allows
the PT4302 to be self-adjusted to normal operation if an open or short occurs. The PT4302 needs few external
components, which makes it an ideal choice for portable applications where a smaller board space is critical. The
LED current is programmable from 3mA to 25mA in a 3mA step by applying digital codes at the EN/SET pin.
A built-in soft-start circuit prevents a high inrush current from being drawn from the supply source during
power on and 1×/1.5× mode switching. The thermal shutdown and current limiter prevents the PT4302 from being
damaged by short to ground or overload conditions. The ultra small shut-down current of less than 1µA significantly
prolongs the battery life. The PT4302 is available in small MSOP-10 and QFN-10 packages.
FEATURES
z 2.7V-5.5V input range
z 1x/1.5x auto-adjust charge pump
z LED fault detection
z Programmable 8 level LED currents from 3mA to
25mA
z < ±2% LED maximum current mismatch between
channels
z Less than 1µA shut down current
z Built-in soft-start and mode soft-switching
z Miniature MSOP-10 and QFN-10 package
APPLICATIONS
z Cell phones
z PDAs
z Digital cameras
z Small LCD displays
z Programmable current sink
PACKAGES
Vin
C2-
C1-
Gnd
En/Set
C1+
Vout
C2+
led2
led1
Vin
C2-
C1-
Gnd
En/Set
C1+
Vout
C2+
led2
led1
MSOP-10 Top View
QFN-10 Top View
TYPICAL APPLICATION
3V to 5.5V
Cin
1uF
Vin C1+
C1-
C2+
PT4302
C2-
En/Set
Vout
C1
1uF
C2
1uF
All capacitors are
ceramic capacitors
D1
led1
Gnd led2
D2
C3
1uF
PIN DESCRIPTION
Pin No.
1
2
3
4
5
Symbol
Vin
C2-
C1-
Gnd
En/set
Description
Power supply
Negative terminal of fly capacitor 2
Negative terminal of fly capacitor 1
ground
Chip enable and Led current programming pin
Pin No.
6
7
8
9
10
Symbol
Led1
Led2
C2+
Vout
C1+
Description
The current sink of channel 1 to drive LED
The current sink of channel 2 to drive LED
Positive terminal of fly capacitor 2
Output voltage source connecting to a 1µF cap
Positive terminal of fly capacitor 1
www.micro-bridge.com
PT4302_DSB Rev EN_1.1
Page 1




Powtech

PT4302 Datasheet Preview

PT4302 Datasheet

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

No Preview Available !

PT4302
2 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VIN Range
VOUT Range
VEn/Set Range
Operation Junction Temp. range
Storage Temp.
MSOP Lead Soldering Temp.
Thermal
MSOP-10
resistance, ΘJA
QFN-10
VALUE
-0.3~6.5V
-0.3~6.5V
VIN+0.3~Gnd-0.3
-40~150
-55~150
260, 10 sec.
190
40
UNIT
V
V
V
°C
°C
°C
W/°C
BRIEF BLOCK DIAGRAM
Vin
En/Set
C1+ C1- C2+ C2-
Current Limiter
Charge pump Switches
1×/1.5×
Digital
Interface
Current
Reference
+
Vout
Led1
Led2
Thermal
Shutdown
Soft
Start
+
Gnd
ELECTRICAL CHARACTERISTICS
VDD=3.5V, , C1=C2=C3=C4=1µF, TA=25, unless specified otherwise.
SYMBOL
ITEMS
CONDITIONS
Min.
VIN Input Voltage
IOFF Operating CurrentShutdown
Iq Operating CurrentQuiescent
EN/SET=0
No load Current
2.7
IOLP
FCLK
TSS(note.1)
V15-1
V1-15
IOUT
IMatch
Vovp
VEN-L
VEN-H
IEN/SET
TsetL
TsetH
TOFF
TINIT
Over Load Protection
Short Vout to Gnd
Charge Pump Switching Frequency
0.8
Charge Pump Soft-start time
The Threshold of 1.5X-> 1X
VLED1=VLED2=3.5V, ILED=25mA
The Threshold of 1X-> 1.5X
Maximum LED output current
Current match between D1 and D2
Over output voltage protection
VLED1=VLED2=3.5V, ILED=25mA
3.0<vin<5.5, VLED=3.5V, en/set set
the output to maximum current
3.0<vin<5.5en/set set the output
to maximum current
Vin=4, Open all led
22.5
En/Set Maximum Low Level Threshold Vin=5
En/Set Minimum high level threshold
Vin=5
1.8
En/Set Input Current
En/Set low level width
Vin=5V, Ven/set=5
-1
0.3
En/Set high level width
En/Set shut down low level width
The period that En/Set stay at high level
100
when system reset
TSD Thermal Shut Down Threshold
THY Thermal Shut Down Hysteresis
Temperature rise
150
Typ.
0.1
1.5
300
1.0
550
4
3.8
25
5.5
50
160
10
Max.
5.5
1
3
1.2
27.5
2
1.4
1
75
500
170
UNIT
V
µA
mA
mA
MHz
µs
V
V
mA
%
V
V
V
uA
us
ns
us
us
oC
oC
www.micro-bridge.com
PT4302_DSB Rev EN_1.1
Page 2


Part Number PT4302
Description 2 Channel 1x/1.5x Auto-Adjust Charge Pump White LED Driver
Maker Powtech
PDF Download

PT4302 Datasheet PDF






Similar Datasheet

1 PT430 Narrow Acceptance Phototransistor
Sharp Electrionic
2 PT4301 Low Power High Sensitivity 315/434 MHz OOK/ASK Superheterodyne Receiver
PTC
3 PT4301 1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver
ETC
4 PT4301 4 Channel 1x/1.5x Auto-Adjust Charge Pump White LED Driver
Powtech
5 PT4302 Ultra-Low Power OOK/ASK Receiver
PTC
6 PT4302 2 Channel 1x/1.5x Auto-Adjust Charge Pump White LED Driver
Powtech
7 PT4303 1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver
Powtech
8 PT4303 1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver
ETC
9 PT4305 315 MHz / 433.92 MHz PLL Tuned Low Power FSK Receiver
PTC





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy