LP3958TL/NOPB National Semiconductor, LP3958TL/NOPB Datasheet - Page 25

• 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
KEYPAD MAX CURRENT (02H) – MAXIMUM KEYPAD CURRENT CONTROL REGISTER
WLED CONTROL (03H) – WLED CONTROL REGISTER
R - 0
R - 0
D7
D7
R - 0
D6
R - 0
D6
SLOPE
FADE_SEL
EN_FADE
DISPL
EN_MAIN
EN_SUB
SLOPE
RW - 0
D5
RW - 0
D5
IK1,2,3[1:0]
IK1[1:0]
Maximum current for KEY1,2,3 driver
00
01
10
11
FADE_SEL
RW - 0
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
D4
RW - 0
D4
0 – fade execution time 0.65 sec (full scale)
1 – fade execution time 1.3 sec (full scale)
0 – fade control for MAIN
1 – fade control for SUB
0 – automatic fade disabled
1 – automatic fade enabled
0 - MAIN and SUB individual control
1 - MAIN and SUB controlled with MAIN DAC
0 – MAIN output disabled
1 – MAIN output enabled
0 – SUB output disabled
1 – SUB output enabled
(Continued)
Maximum output current
25
EN_FADE
RW - 0
RW - 0
0.25 x I
0.50 x I
0.75 x I
1.00 x I
D3
D3
IK2[1:0]
MAX
MAX
MAX
MAX
RW - 0
DISPL
RW - 0
D2
D2
EN_MAIN
RW - 0
RW - 0
D1
D1
IK3[1:0]
EN_SUB
RW - 0
RW - 0
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D0
D0