LP3958TL/NOPB National Semiconductor, LP3958TL/NOPB Datasheet - Page 27

• 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

LP3958 Register Bit Explanations
ENABLES (0BH) – ENABLES REGISTER
BOOST OUTPUT (0DH) – BOOST OUTPUT VOLTAGE CONTROL REGISTER
PWM ENABLE (2BH) – EXTERNAL PWM CONTROL REGISTER
R - 0
D7
R - 0
RW - 0
D7
D7
R - 0
D6
R - 0
NSTBY
RW - 0
D5
EN_EXT_K1_PWM
EN_EXT_K2_PWM
EN_EXT_K3_PWM
EN_EXT_MAIN_PWM
EN_EXT_SUB_PWM
D6
RW - 0
D6
EN_EXT_K1_PWM
NSTBY
EN_BOOST
EN_AUTOLOAD
RW - 0
D4
EN_BOOST
RW - 0
RW - 0
BOOST[7:0]
0000 1000
0000 1001
0000 1010
0000 1011
0000 1100
0000 1101
0000 1110
0000 1111
0001 0000
0001 0001
0001 0010
D5
D5
BOOST output voltage adjustment
EN_EXT_K2_PWM
Bit 6
Bit 5
Bit 2
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RW - 0
RW - 0
R - 0
D4
D4
D3
0 – LP3958 standby mode
1 – LP3958 active mode
0 – Boost converter disabled
1 – Boost converter enabled
0 – Boost active load disabled
1 – Boost active load enabled
Typical boost output voltage (V)
BOOST[7:0]
(Continued)
0 – External PWM control for KEY1 disabled
1 – External PWM control for KEY1 enabled
0 – External PWM control for KEY2 disabled
1 – External PWM control for KEY2 enabled
0 – External PWM control for KEY3 disabled
1 – External PWM control for KEY3 enabled
0 – External PWM control for MAIN disabled
1 – External PWM control for MAIN enabled
0 – External PWM control for SUB disabled
1 – External PWM control for SUB enabled
27
R - 0
D3
RW - 1
EN_EXT_K3_PWM
D3
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
8.00
9.00
RW - 0
D2
EN_AUTOLOAD
RW - 0
RW - 1
D2
D2
EN_MAIN_PWM
RW - 0
D1
RW - 0
D1
R - 0
D1
EN_SUB_PWM
RW - 0
RW - 0
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D0
D0
R - 0
D0