Current Source. RP2404 Datasheet

RP2404 Source. Datasheet pdf. Equivalent

RP2404 Datasheet
Recommendation RP2404 Datasheet
Part RP2404
Description 4 Channels Pulse Dimming Current Source
Feature RP2404; Preliminary RP2404 4 Channels Pulse Dimming Current Source for WLED Driver General Description F.
Manufacture RICHPOWER
Datasheet
Download RP2404 Datasheet




RICHPOWER RP2404
Preliminary
RP2404
4 Channels Pulse Dimming Current Source for WLED Driver
General Description
Features
The RP2404 low-dropout bias supply for white LEDs is a
high-performance alternative to the simple ballast resistors
used in conventional white LED designs. The RP2404 uses
an internal resistor to set the bias current for 4LEDs, which
are matched to 2%. The RP2404's advantages over ballast
resistors include much lower bias variation with supply
voltage variation, significantly lower dropout voltage , and
2%
in some applictions, significantly improved efficiency.
Low 50mV Dropout at 20mA
16 Steps Pulse Dimming
2% LED Current Matching
2.7V to 4.5V Supply Voltage Range
Thermal Shutdown Protection
RP2404 is available in WQFN 3X3-16L package. It
provides the best backlighting solution with high efficiency
and smallest board space for portable application.
Applications
Ordering Information
Camera Phone, Smart Phone, MP3
White LED Backlighting
RP2404
Package Type
QW: WQFN 3X3-16L
Operating Temperature Range
G: Green ( Halogen Free with Commer-
cial Standard
Note :
Richpower Green products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative
directly or through a Richpower distributor located in your
area.
Pin Configurations
(TOP VIEW)
RP2404-00P Jan 2010
16 15 14 13
NC 1
NC 2
NC 3
NC 4
GND
12 LED2
11 LED3
10 LED4
9 NC
5678
WQFN 3x3-16L
1



RICHPOWER RP2404
RP2404
Typical Application Circuit
Preliminary
VBAT 2.7V to 5.0V
Pulse Dimming
VIN
RP2404
EN
LED1
LED2
LED3
LED4
GND
Figure 1. Application circuit of RP2404
Existing
Regulator
VBAT 2.7V to 5.0V
Pulse Dimming
VIN
RP2404
EN
LED1
LED2
LED3
LED4
GND
Figure 2. Application circuit of RP2404 with existing Regulator
Timing Diagram (16-steps Pulse Dimming and Shutdown Delay)
30us < tREADY 0.5us < tHI
0.5us < tLO < 500us
3ms < tSHDN
EN 0
1 2 3 4 5 14
Shutdown 100% 15/16 14/16 13/16 12/16 3/16
ILEDx
2/16
15 0 1
100% 15/16
1/16
Shutdown
2 RP2404-00P Jan 2010



RICHPOWER RP2404
Functional Pin Description
Preliminary
RP2404
Pin Number
1,2,3,4,,9,14,15, 16
5
6
7
8
10
11
12
13
Exposed Pad
Pin Name
Pin Function
NC No Internal Connection.
AGND Power Ground.
PGND Power Ground.
VIN Power Input.
EN Enable Input.
LED 4 Current Sink for LED4. (If not in use, let this pin floating or connect to VIN)
LED 3 Current Sink for LED3. (If not in use, let this pin floating or connect to VIN)
LED 2 Current Sink for LED2. (If not in use, let this pin floating or connect to VIN)
LED 1 Current Sink for LED1. (If not in use, let this pin floating or connect to VIN)
GND Exposed pad should be soldered to PCB board and connected to GND.
Function Block Diagram
VIN
UVLO
Current
Bias
OTP
EN Shutdown Delay
BandGap
Reference
+
16 steps
Pulse Dimming
Controller
Current Source
GND
LED1
LED2
LED3
LED4
RP2404-00P Jan 2010
3







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