LP3958TL/NOPB National Semiconductor, LP3958TL/NOPB Datasheet - Page 25
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LP3958TL/NOPB
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
Datasheet
1.LP3958TLNOPB.pdf
(28 pages)
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