LP3958TL/NOPB National Semiconductor, LP3958TL/NOPB Datasheet - Page 26

• 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

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LP3958 Register Bit Explanations
MAIN CURRENT (04H) – MAIN CURRENT CONTROL REGISTER
SUB CURRENT (05H) – SUB CURRENT CONTROL REGISTER
GPIO CONTROL (06H) – GPIO CONTROL REGISTER
GPIO DATA (07H) – GPIO DATA REGISTER
RW - 0
RW - 0
R - 0
R - 0
D7
D7
D7
D7
R - 0
D6
R - 0
RW - 0
RW - 0
EN_PWM_PIN
OEN[2:0]
D6
D6
D6
R - 0
DATA[2:0]
D5
R - 0
RW - 0
RW - 0
D5
D5
D5
Bit 4
Bits 2-0
MAIN[7:0],
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
1111 1101
1111 1110
1111 1111
SUB[7:0]
…
EN_PWM_PIN
MAIN, SUB current adjustment
Bits 2-0
RW - 0
R - 0
0 – External PWM pin disabled
1 – External PWM pin enabled
0 – GPIO pin set as a input
1 – GPIO pin set as a output
D4
RW - 0
RW - 0
D4
D4
D4
MAIN[7:0]
Typical driver current (mA)
SUB[7:0]
(Continued)
GPIO data register bits
26
R - 0
D3
RW - 0
RW - 0
R - 0
D3
D3
25.3
25.4
25.5
D3
0.1
0.2
0.3
0.4
…
0
RW - 0
D2
RW - 0
RW - 0
RW - 0
D2
D2
D2
DATA[2:0]
RW - 0
OEN[2:0]
RW - 0
RW - 0
RW - 0
D1
D1
D1
D1
RW - 0
RW - 0
RW - 0
RW - 0
D0
D0
D0
D0