LTC3524_15 Datasheet, PDF (14/16 Pages) Linear Technology – Adjustable TFT Bias Supply with WLED Driver

LTC3524
TYPICAL APPLICATIONS
Li-Ion to +5V, 25mA, +16V, 1mA, –13V, 1mA TFT LCD Power Supply + 10 White LEDs
+
– ^Li-Ion
+5V, 25mA
10μF _324k
+10V
0.47μF
+16V, 1mA
0.47μF _165k
2.2μF 10μH
4.7μH
SW1
V_IN
SW2
VLED
10μF
1M
0.1μF
2M
V_OUT
LED2
FBVO
V2x
C2⁺
C2^–
LTC3524
LED1
100k FOR 20mA
PROG
ELED2
ELED1
ELCD
V_IN
0.47μF
VNIN
VH
FBN
FBH
VN
CH⁺ CH^– GND CN⁺
287k
V_OUT
1M _{–13V, 1mA} ^0.47μF
0.1μF
0.1μF
REQUIRED
VH _{FOR LCD BIAS}
SEQUENCING
V2x _{WHEN |VN| > V2X}
3524 TA02a
100
90
4.2
80 ^3.6
3.1
70 ^4.2
3.1
LCD (V_IN)
LED (V_IN)
3.6
60
5
10
15
20
25
V_OUT OR LED STRING CURRENT (mA)
3524 TA02b
3524f
14