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RS9360A/B
Charge-Pump White LED Driver
Description
The RS9360 is a compact, high efficient and high integration charge pump with current matched white LED driver. It can support
1 to 4 White LED's and optimized for Li-Ion battery applications. The four WLEDs current are matched for consistent brightness.
User can control WLED on/off via three programming bits. The every WLED channel can support up to 30mA current.
Features
•
With Current Source
•
Drives Up to Four LEDs
•
Soft Start Function & Short Circuit Protection
•
High Efficiency: Over 90%
•
250KHz/1MHz Fixed Frequecny CSC.
•
Three Charge-pump Mode: X1,X1.5,X2
•
QFN-16L4X4 Pb-Free Packaging
•
Compatible RT9360& SC604 & MPS1519 & AAT3140 & MAX1910 & FAN5607 & LM2794 & CAT3604
Applications
•
Cellular Phones & White Photo Flash for DSC
•
Color (RGB) Lightng
•
PDAs, Hand-held Computers GPS Receivers
•
White LED Backlighting
Pin Connections
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Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13 to 16
Exp. Pad
Pin Name
EN
CTRL0
CTRL1
CTRL2
ISET
VOUT
VIN
C1P
C1N
C2N
C2P
GND
LED1 to 4
GND
Pin Function
Chip Enable (Active High). Note that this pin is high impedance. There should be a
pull low 100kΩ resistor connected to GND when the control signal is floating.
Output Control Bit 0. (See Table 1)
Output Control Bit 1. (See Table 1)
Output Control Bit 2. (See Table 1)
LED current is set by the value of the resistor RSET connected from the ISET pin to
ground. Do not short the ISET pin. VISET is typically 1.1V.
Output Voltage Source for connection to the LED anodes.
Power Input Voltage
Positive Terminal of Bucket Capacitor 1
Negative Terminal of Bucket Capacitor 1
Negative Terminal of Bucket Capacitor 2
Positive Terminal of Bucket Capacitor 2
Ground.
Current Sink for LED. (If not in use, pin should be connected to VOUT)
Exposed pad should be soldered to PCB board and connected to GND.
Block Diagram
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Typical Application Circuit
Fig.1 For 4-WLEDs Application Circuit
Fig.2 For 3-WLEDs Application Circuit
Fig.3 For 2-WLEDs Application Circuit
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Absolute Maximum Rating
Parameter
Input Voltage
Output Voltage
Power Dissipation ( QFN-16L 4X4 ) @ 25
o
C
Maximum Junction Temperature
Lead Temperature
Operating Temperature Range
Storage Temperature Range
HBM ESD
Symbol
VIN
VOUT
P
D
T
J
T-
LEAD
T
OPR
T
STG
ESD
Value
-0.3~6
-0.3~6
2.5
125
260
-40 to + 85
-40 to + 85
2000
Unit
V
V
W
o
o
o
o
C
C
C
C
V
Caution:
The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any condition.
Operations
The RS9360 is a high efficiency charge pump white LED driver. It provides 4 channels low drop-out voltage current source to
regulated 4 white LEDs current. For high efficiency, the RS9360 implements x1/x1.5/x2 mode charge pump. An external RSET is
used to set the current of white LED. RS9360 has a input current regulation to reduce the input ripple.
Soft Start
The RS9360 includes a soft start circuit to limit the inrush current at power on and mode switching. Soft start circuit holds the input
current level long enough for output capacitor COUT
reaching a desired voltage
level. When the soft start off, the RS9360 won’ t
sink spike current from VIN.
Mode Decision
The RS9360
uses a smart
mode decision method to select the working mode for maximum efficiency. Mode decision circuit
senses the output and LED voltage for up/down selection.
Dimming Control
CTRL0, CTRL1 and CTRL2 are used to control the onoff of White LED. When a external PWM signal is connected to the control
pin, brightness of white LED is adjusted by the duty cycle.
LED Current Setting
The current of white LED connected to RS9360 can be set by RSET. Every current flows through the white LED is 440 times
greater than the current of RSET. The white LED can be estimated by following equation:
⎛
V
I
LED
=
440
× ⎜
ISET
⎜
R
⎝
SET
When V
ISET
= 1.1V, and R
SET
is the resistance connected from I
SET
to GND.
⎞
⎟
⎟
⎠
Thermal Shutdown
The RS9360 provides a high current capability
to drive 4 white LEDs. A thermal shutdown circuit is needed to protect the chip from
thermal damage. When the chip reaches the shutdown temperature 150℃, the thermal shutdown circuit turns off the chip to
prevent the thermal accumulation in the chip.
Overvoltage Protection
The RS9360 regulates the output voltage by controlling the input current. When the output voltage reaches the designated level,
the RS9360 reduces the input current. And then, the output voltage regulation also serves an over-voltage protection.
Short Circuit Protection
A current limiting circuit is also included in theRS9360 for short circuit protection. Whenever output source a dangerously high
current, the current limiting circuit takes over the output regulation circuit and reduces the output current at an acceptable level.
DS-RS9360-01 Aug, 2006
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Page No. : 5/8
Table 1
CTRL 2
0
0
0
0
1
1
1
1
Control Inputs
CTRL 1
0
0
1
1
0
0
1
1
CTRL 0
0
1
0
1
0
1
0
1
LED 4
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Output Status
LED 3
LED 2
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
OFF
LED 1
ON
OFF
OFF
OFF
ON
ON
ON
OFF
Electrical Characteristics
(Ta=25°C,
V
IN
=2.85-5.5V, C1=C2=1.0μF, ESR=0.03Ohms, unless otherwise noted.)
Parameter
Input Supply Voltage
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Current into LEDs 1, 2, 3 and 4
RS9360A
RS9360B
Symbol
VIN
Test Condition
VIN rising
RSET = 24kΩ
RSET = 91kΩ
2.7V < VIN < 5.5V
3.1V < VIN < 5.5V
F
OSC
=250KHz, EN = High, No Load
F
OSC
=1MHz, EN = High, No Load
I
LED
Quiescent Current
I
Q
Min.
2.5
1.8
--
18.5
4.5
2
2
--
--
--
--
--
--
--
200
0.8
250
--
Typ.
2.2
50
20
5
--
--
2.5
2.5
1
2
1
3.75
2.85
250
1.0
400
5.5
Max.
5.5
2.4
--
21.5
5.5
20
30
3.5
3.5
10
7.5
5
3.85
2.95
300
1.2
650
6
Unit
V
V
mV
mA
mA
mA
mA
mA
mA
μA
%
%
V
V
kHz
MHz
mA
V
RS9360A/B
I
LED
Accuracy (Note 5)
Current Matching (Note 6)
1x mode to 1.5x mode Transition
Voltage (VIN falling)
1.5x mode to 2x mode Transition
Voltage (VIN falling)
Oscillator Frequency
Input Current Limit
Output Over Voltage Protection
VIN = 4.2V, EN = Low
ILED-ERR
2mA < ILED < 30mA
ILED-LED-ERR
2mA < ILED < 30mA
V
LED
= 3.5V, IOUT=80mA
ILED1 = ILED2 = ILED3 = ILED4 =
V
TRANS1X
20mA
VLED= 3.5V, IOUT= 80mA
ILED1 = ILED2 = ILED3 = ILED4 =
V
TRANS1.5X
20mA
RS9360A
F
OSC
RS9360B
Short Circuit applied from VOUT to
I
LIMIT
GND
Open circuit at any LED that is
V
OVP
programmed to be in the on state
DS-RS9360-01 Aug, 2006
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