Preliminary Datasheet
LP3361
6-Channel Constant Current White LED Driver
General Description
The LP3361 is a low-dropout bias supply for white LEDs is
a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. It
supports 6 white LEDs with regulated constant current for
uniform intensity. The LP3361 maintains low dropout
current regulators. The LP3361 requires a 45mV dropout
at a 20mA load on each output to match the LED brightness.
The brightness of LEDs can be tuned through a pulse width
modulated signal at the PWM pin,the PWM frequency from
200Hz to 10KHz and the Duty from 0 to 100%.
The LP3361 is available in a TDFN-10 package.
Features
2.7V to 6V Input Voltage
20mA maxim sink current
Dual Panel Driver of WLED
PWM tuned LED brightness through EN pin
Soft Start Function
Built-in Thermal Protection
I
Q
<1uA in Shutdown
TDFN-10 Package
RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
LP3361
VBAT
3
8
ON/OFF
2
7
EN1
EN2
LED5
11
GND
LED6
VDD1
LED2
VDD2
LED3
LED4
LED1
1
4
5
6
9
10
Sub_Panel
2.2uF
Main_Panel
VBAT
Order Information
LP3361 -
□ □ □
F: Pb-Free
Package Type
QV:TDFN-10
Marking Information
Please see website.
Applications
LCD Panel
Cellular and Smart mobile phone
PDA/DSC
PMP
LP3361 – Ver. 1.0 Datasheet
Nov.-2008
Page 1 of 6
Preliminary Datasheet
Application Information
LP3361
VBAT
3
8
MAIN_CTRL
2
ON
OFF
SUB_CTRL
11
GND
7
EN1
EN2
LED5
LED6
VDD1
LED2
VDD2
LED3
LED4
LED1
1
4
8
5
6
OFF
9
10
Sub_Panel
2.2uF
Main_Panel
VBAT
VBAT
3
VDD1
LED2
VDD2
LED3
LED4
LED5
GND
LED6
LP3361
LED1
1
4
5
6
9
10
Main_Panel
LP3361
VBAT
2.2uF
Backlight_CTRL
2
EN1
ON
7
EN2
Key Pad_CTRL
11
KeyPad_LED
LP3361 Driver Dual Panel Application
LP3361 Driver Panel and Keypad WLED Application
LP3361
VBAT
3
8
ON/OFF
2
7
11
EN1
EN2
LED5
GND
LED6
VDD1
LED2
VDD2
LED3
LED4
LED1
1
4
5PCS LED
VBAT
VBAT
3
8
LP3361
LED1
VDD1
LED2
VDD2
LED3
2
EN1
EN2
LED5
11
GND
LED6
LED4
1
4
5
6
9
10
6PCS LED
VBAT
5
ON/OFF
6
NC
7
9
10
2.2uF
2.2uF
LP3361 Driver 5pcs White-LED Application
LP3361 Driver 6pcs White-LED Application
LP3361
VBAT
3
NC
ON/OFF
2
NC
7
11
EN1
EN2
LED5
GND
LED6
8
VDD1
LED2
VDD2
LED3
LED4
LED1
1
4
4PCS LED
VBAT
VBAT
3
8
LP3361
LED1
VDD1
LED2
VDD2
LED3
2
7
EN1
EN2
LED5
GND
LED6
LED4
1
Flash LED
4
5
6
22uF
9
10
EN1
0
0
1
1
EN2
0
1
0
1
ILED
0mA
40mA
80mA
120mA
VBAT
5
ON/OFF
6
9
NC
10
NC
2.2uF
11
LP3361 Driver 4pcs White-LED Application
LP3361 Driver Flash White-LED Application
LP3361 – Ver. 1.0 Datasheet
Nov.-2008
Page 2 of 6
Preliminary Datasheet
Functional Pin Description
P a c k a g e Ty p e
Pin Configurations
LP3361
LED1
1
10
LED6
EN1
2
11
9
LED5
TDFN-10
VDD1
3
GND
8
VDD2
LED2
4
7
EN2
LED3
5
6
LED4
PIN
NAME
DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
LED1
EN1
VDD1
LED2
LED3
LED4
EN2
VDD2
LED5
LED6
GND
LED1 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
Device enable1 (active high).Control from LED1 to LED4 and used a PWM
dimming brightness.
LED1~LED4 power supply.
LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
LED3 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
LED4 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
Device enable2 (active high).Control from LED5 to LED6 and used a PWM
dimming brightness.
LED5,LED6 power supply.
LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
LED2 cathode terminal. 20mA Current flows into LED. Floating is used to disable.
Gound.
LP3361 – Ver. 1.0 Datasheet
Nov.-2008
Page 3 of 6
Preliminary Datasheet
Absolute Maximum Ratings
LP3361
Input Voltage to GND (VDD1
,
VDD2
)
---------------------------------------------------------------------- 6.5V
EN to GND Voltage (V
EN
) ---------------------------------------------------------------------- -0.3V to V
in
+0.3V
Operating Junction Temperature Range (T
J
) --------------------------------------------------
-40
℃
to 125
℃
Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 300
℃
Thermal Information
Maximum Power Dissipation (P
D
) DFN-10 ---------------------------------------------------------------- 1.5W
Thermal Resistance
(JA)
------------------------------------------------------------------------------------ 58
℃
/W
Electrical Characteristics
(Over recommended operating conditions unless specified otherwise) V
INA
=3.6V,EN=High, T
A
=25
℃
)
Symbol
V
IN
I
Q
I
SHDN
I
LED-ERR
I
LED-LED-ERR
V
EN(L)
V
EN(H)
Parameter
Input Voltage
Quiescent Current
Shutdown Current
LED Current Accuracy
LED Channel Matching
Enable Threshold Low
Enable Threshold High
No Load,
EN = GND
Conditions
LP3361
Min.
Typ.
3
75
0.1
19.4
-3
2
Max.
5.5
75
1
20.6
3
0.5
Unit
V
uA
µA
mA
%
V
V
3mA< I
LED<
30mA
Any two channel mismatch
20
LP3361 – Ver. 1.0 Datasheet
Nov.-2008
Page 4 of 6
Preliminary Datasheet
Typical Operating Characteristics
LP3361
LP3361 – Ver. 1.0 Datasheet
Nov.-2008
Page 5 of 6
京公网安备 11010802033920号
EEWORLD
