LP3958 Datasheet, PDF (6/36 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

LP3958
SNVS423C – JANUARY 2006 – REVISED MARCH 2013
BLOCK DIAGRAM
L1
C_IN C_VDD
10 PH
Li-Ion
Battery
or
Charger
10 éF 100 nF VDD2
VDD1
1 PF
VDDA
C_VDDA
VREF
C_VREF ^{100 nF}
Logic supply
LDO
REF
POR
THSD
R_KEY
IKEY
IRT
R_RT
BIAS
OSC
Optional EMI FILTER,
close to SW pin
R_SW ^CSW
390: 100 pF
SW
D1
PWM
BOOST
8-Bit
IDAC
D
A
V_DDIO
MCU
R_SDA
SDA
SCL
NRST
VDDIO
C_VDDIO
100 nF
GPIO[2]
GPIO[1]
GPIO[0]/PWM
CONTROL
8-Bit
IDAC
D
A
I²C
BRIGHTNESS
CONTROL
www.ti.com
FB
BG
I_MAX = 70 mA
V_OUT = 8...18 V
C_OUT
2 x 4.7 éF
GND_SW _MAIN
BACKLIGHT
0...25 mA/LED
MAIN
GND_WLED
SUB
BACKLIGHT
0...25 mA/LED
SUB
3 STRINGS
OF 4 LEDS
FOR KEYPAD
KEY1
KEY2
KEY3
GND
GND_KEY
6
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