LP3958TL/NOPB National Semiconductor, LP3958TL/NOPB Datasheet - Page 3

• Manufacturer Part Number: LP3958TL/NOPB
• Description: IC LED DRVR WT/CLR BCKLT 25-USMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Backlight, White LED, Color LEDr

Specifications of LP3958TL/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 5
• Internal Driver: Yes
• Type - Primary: Backlight, Light Management Unit (LMU)
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 18V
• Mounting Type: Surface Mount
• Package / Case: 25-MicroSMD
• Operating Temperature: -30°C ~ 85°C
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• Other names: LP3958TLTR

Pin #
Connection Diagrams and Package Mark Information
PIN DESCRIPTIONS
5E
5D
5C
5B
5A
4E
4D
4C
4B
4A
3E
3D
3C
3B
3A
2E
2D
2C
2B
2A
1E
1D
1C
1B
1A
GPIO[0] / PWM
GND_WLED
GND_KEY
GND_SW
GPIO[2]
GPIO[1]
VDDIO
GNDT
Name
NRST
VDD2
VDD1
VREF
VDDA
KEY1
KEY2
KEY3
MAIN
IKEY
GND
SDA
SUB
SCL
SW
IRT
FB
Logic Input/Output
Logic Input/Output
Logic Input/Output
Logic Input/Output
Logic Input
Ground
Ground
Ground
Ground
Ground
Output
Output
Output
Output
Output
Output
Output
Output
Power
Power
Power
Type
Input
Input
Input
Input
Boost Converter Power Switch
Boost Converter Feedback
Keypad LED Output 1 (Current Sink)
Keypad LED Output 2 (Current Sink)
Keypad LED Output 3 (Current Sink)
Power Switch Ground
External Reset, Active Low
Clock Input for I
External Keypad LED Maximum Current Set Resistor
Ground for KEY LED Currents
Supply Voltage 3.0...5.5 V
Supply Voltage for Digital Input/Output Buffers and Drivers
Data Input/Output for I
General Purpose Logic Input/Output
General Purpose Logic Input/Output / External PWM Input
Ground for White LED Currents (MAIN and SUB Outputs)
Ground
Supply Voltage 3.0...5.5 V
Reference Voltage (1.23V)
General Purpose Logic Input/Output
MAIN Display White LED Current Output (Current Sink)
SUB Display White LED Current Output (Current Sink)
Internal LDO Output (2.80V)
Ground for Core Circuitry
Oscillator Frequency Set Resistor
3
2
C Compatible Interface
2
C Compatible Interface
Description
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