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LED DRIVER. PR4404 Datasheet

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LED DRIVER. PR4404 Datasheet







PR4404 DRIVER. Datasheet pdf. Equivalent




PR4404 DRIVER. Datasheet pdf. Equivalent





Part

PR4404

Description

LED DRIVER

Manufacture

PREMA

Datasheet
Download PR4404 Datasheet


PREMA PR4404

PR4404; LED DRIVER PR4404 Low Voltage Boost Dri ver PR4404 for 0.5W / 1W Power LEDs The PR4404 is a step-up converter for whit e LEDs, operating with single battery c ell supply (1.2/1.5V) at up to 150mA LE D current or dual cell supply (2.4/3.0V ) at up to 300mA LED current. A minimum part count allows compact and cost-eff icient solutions. The converter can be switched on and of.


PREMA PR4404

f with a logic signal, which is useful e .g. for PWM control, timer circuits etc . Features • • • • minimum sta rtup voltage 1.0V supply by one or two battery cells low number of external co mponents battery deep discharge protect ion Applications • • • • LED t orches LCD panel backlighting home ligh ting toys Typical Application Circuit Pin Description PR4404 SW Vout Vc.


PREMA PR4404

c Vs Pin No 1 2 3 4 5 6 7 8 Pin Name S W Vout Vcc Vs Hold Gnd (A) Gnd (sub) Gn d (S) Pin Function Description driver output output voltage, rectified batter y supply input LED cathode / current se nse resistor shutdown ground (analog)* ground (substrate)* ground (power)* 1 SZ22v10 lot code date code 2 3 4 8 7 6 5 Gnd(S) Gnd(sub ) Gnd(A) Hold *Pin s 6, 7, 8 must all.



Part

PR4404

Description

LED DRIVER

Manufacture

PREMA

Datasheet
Download PR4404 Datasheet




 PR4404
LED DRIVER PR4404
Low Voltage Boost Driver PR4404
for 0.5W / 1W Power LEDs
The PR4404 is a step-up converter for white LEDs, operating with single battery cell
supply (1.2/1.5V) at up to 150mA LED current or dual cell supply (2.4/3.0V) at up to
300mA LED current.
A minimum part count allows compact and cost-efficient solutions.
The converter can be switched on and off with a logic signal, which is useful e.g. for PWM
control, timer circuits etc.
Features
minimum startup voltage 1.0V
supply by one or two battery cells
low number of external components
battery deep discharge protection
Applications
LED torches
LCD panel backlighting
home lighting
toys
Typical Application Circuit
Pin Description PR4404
SW 1
Vout 2
Vcc 3
Vs 4
8 Gnd(S)
7 Gnd(sub
)
6 Gnd(A)
5 Hold
Pin No
1
2
3
4
5
6
7
8
Pin Name
SW
Vout
Vcc
Vs
Hold
Gnd (A)
Gnd (sub)
Gnd (S)
Pin Function
Description
driver output
output voltage, rectified
battery supply input
LED cathode / current
sense resistor
shutdown
ground (analog)*
ground (substrate)*
ground (power)*
*Pins 6, 7, 8 must all be connected.
© PREMA Semiconductor GmbH 2008
Page 1/12
PRELIMINARY DATA
Rev 3408
Free Datasheet http://www.datasheet4u.com/





 PR4404
LED DRIVER PR4404
Block Diagram
Absolute Maximum Ratings
Parameter
VCC (no damage)
SW output peak current
Operating junction temperature
Storage Temperature Range
Electrostatic Discharge (ESD) Protection
Electrical Characteristics
Ta = 25°C, unless otherwise noted.
Symbol
Parameter
Vcc Supply Voltage, min. operating
min. startup
max. operating
Vsat SW output transistor saturation
fsw Switching Frequency
VFB Feedback voltage threshold at Vs
Quiescent supply current
Icc Supply current
VSW Clamp SW output clamping voltage
ΘJA Thermal resistance
junction - ambient
* but Vcc not higher than VF (LED)
Min Typ Max
-0.3 8
1.5
-20 125
-55 150
2
Units
V
A
°C
°C
kV
Conditions
Min Typ Max Units
0.89
1.00
1.05
5.0*
V
V
V
1.0A
0.4 V
300 700 kHz
200 mV
Hold = LOW
Vcc > 850mV
2.0 3.0 mA
Hold = open
Vcc > 850mV
2.0 3.0 mA
14
no air convection
160 K/W
© PREMA Semiconductor GmbH 2008
Page 2/12
PRELIMINARY DATA
Rev 3408
Free Datasheet http://www.datasheet4u.com/





 PR4404
LED DRIVER PR4404
Typical Characteristics
This datasheet presents characteristics for different typical applications:
A. Supply voltage 1...2V - target current 100mA - one LED
B. Supply voltage 1...2V - target current 150mA - one LED
C. Supply voltage 1.5...3V - target current 300mA - one LED
D. Supply voltage 2...5V - target current 200mA - two LEDs in series
A and B are typical single battery-cell applications, C for two, and D for three cells.
The behaviour at many other operating conditions can be estimated by interpolation or
extrapolation.
Note that in the following diagrams the peak current through the output switch exceeds the
maximum rating.
Also the power dissipation can cause a junction temperature higher than the maximum
rating under some operating conditions.
These data should give an impression of the performance over the whole set of
parameters, but the fact that they are shown here should not be regarded as an approval
for operation under these conditions.
Test circuit
C1a: 1µF ceramic
C1b: 100µF tantalum
L1: Würth WE-PD XS series; inductance see diagrams
D1: MBRS140
Rs: see diagrams
C2a: 1µF ceramic
C2b: 100µF tantalum
© PREMA Semiconductor GmbH 2008
Page 3/12
PRELIMINARY DATA
Rev 3408
Free Datasheet http://www.datasheet4u.com/



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