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PDF RT4501A Data sheet ( Hoja de datos )
| Número de pieza | RT4501A | |
| Descripción | High Efficiency Backlight LED Driver | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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®
RT4501/A
High Efficiency Backlight LED Driver
General Description
The RT4501/A is a high-efficiency LED driver for backlight
applications. An asynchronous boost converter with an
internal Schottky diode and a current source driver are
designed to support 6LED/channel with wide input voltage
range from 2.5V to 5.5V.
An I2C interface can provide easy backlight control in fast
and high speed mode. The RT4501 supports linear
mappings with 256 steps to setup the brightness of
backlight LEDs. It also supports PWM dimming to adjust
the brightness.
For brightness dimming, the RT4501A supports 128 steps
pulse dimming which determines the LED current, and
RT4501 support 256 steps PWM dimming which
determines the LED current.
The RT4501/A provides complete protection functions such
as input under-voltage lockout, over-current, output over-
voltage and over-temperature protection. The OVP
threshold voltage can be set at 16V and 25.5V for different
applications. The RT4501/A is available in the
WL-CSP-10B 0.87x2.07 (BSC) package.
Features
Input Voltage Range : 2.5V to 5.5V
Internal Schottky Diode
Fast-speed mode I2C Compatible Interface
Drive Up to 7 WLEDs in 2 String
External PWM/Pulse Brightness Control
550k/1.1MHz Switching Frequency
Built-in Internal Soft-Start
PWM Dimming/Pulse Dimming Resolution 256/128
Steps
I2C Programmable 256 Steps Linear Current
Regulation
Up to 85% Efficiency with Small Magnetics
Programmable 16V/25.5V OVP
Current Accuracy ±5% and Current Balance ±3%
UVLO, OVP, OCP, OTP Protection
Shutdown Current : < 1μA
Temperature Range : −40°C to 85°C
RoHS Compliant and Halogen Free
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Portable Instruments
Simplified Application Circuit
L
VIN
CIN
Enable
RT4501/A
LX VOUT
VIN
EN
PWM
SCL
SDA
GND
FB1
FB2
COUT
VOUT
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS4501/A-00 September 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT4501/A
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Power Switch
N-MOSFET On-Resistance
N-MOSFET Current Limit
N-MOSFET Leakage
Current
Protection Function
Over Voltage Protection
Thermal Shutdown
Threshold
RDS(ON)_N
IOCP
ILEAK
OVP
TSD
VIN = 3.6V
LX = 24V, No Switching
Reg0x02 [7] = 0
Reg0x02 [7] = 1
Thermal latch
90 175 350 m
0.8 1 1.2 A
-- -- 1 A
14
24.5
--
16
25.5
150
18
26.5
--
V
V
°C
Logic Control
EN Input
Voltage
Logic-High
Logic-Low
PWM Input
Voltage
Logic-High
Logic-Low
SCL Input
Voltage
Logic-High
Logic-Low
SDA Input
Voltage
Logic-High
Logic-Low
EN Pull-Down Resistance
VENH
VENL
VPW ML
VPW ML
VSCLH
VSCLL
VSDAH
VSDAL
PWM Pull-Down Resistance
Clock Frequency of SCL
fSCL
Pulse Dimming Control
EN Minimum Shut Down
Pulse Width
EN Minimum Logic High
Pulse Width
EN Minimum Logic Low
Pulse Width
tOFF
tHigh_Min
tLow
1.3 --
--
V
-- -- 0.4
1.3 --
--
V
-- -- 0.4
1.3 --
--
V
-- -- 0.4
1.3 --
--
V
-- -- 0.4
-- 400 -- k
-- 400 -- k
-- -- 400 kHz
1 -- -- ms
0.2 --
-- s
0.2 -- 500 s
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS4501/A-00 September 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT4501/A
Slave address =0100010x
Address
Address
Name
0x00 Device ID
0x01 Manufacture
0x02 Config1
0x03 Timing
0x04
Linear
Brightness
Control
0x05 FLAG
BIT
7:0
7:2
1:0
7
6
5
4
3
2
1
0
7
6
5:3
2:0
7:0
7:4
3
2
1
0
Table 2. PWM Dimming Register Map
LABEL
DEV_ID
Default
(Reset Value)
Description
REV
000000
Revision number
VID 11
Vendor ID : Richtek
OVPsel
1
OVP threshold ([0] 16V, [1] 25.5V)
PWM_EN
PWM _SET
Reserved
0
0
PWM enable : [0] Ignored, [1] Enable
PWM active setup : [0] High active, [1] Low
active
MAX_Current 0
[0] 20mA, [1] 30mA,
LED1_EN
1
Backlight LED1 : [0] OFF, [1] ON
LED2_EN
1
Backlight LED2 : [0] OFF, [1] ON
DEV_EN
1
CHIP enable : [0] OFF, [1] ON
RST_SW
0
Software reset : [0] Disable(Auto), [1] Reset
all registers
FSW
1
Switching frequency ([0]550kHz, [1]1.1MHz)
UP_RATE 000
Brightness ramp-up rate : [000] 32s, [001]
4.096ms,
[010] 8.192ms, [011] 16.383ms, [100]
32.768ms,
[101] 65.536ms, [110] 131.072ms, [111]
262.144ms
DN_RATE 000
Brightness ramp-down rate : [000] 32µs, [001]
4.096ms,
[010] 8.192ms, [011] 16.383ms, [100]
32.768ms,
[101] 65.536ms, [110] 131.072ms, [111]
262.144ms
BRIGHT_LIN 11111111
[00000000] 0.39%, [00000001] 0.39%,
……
[111111111] 100%
Reserved
0
LED1_FT
0
LED1 short : [0] Normal, [1] Fault
LED2_FT
0
LED2 short : [0] Normal, [1] Fault
OVP
0
Output over voltage : [0] Normal, [1] Fault
OTP
0
Over temperature : [0] Normal, [1] Fault
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS4501/A-00 September 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT4501A.PDF ] | |
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