LTC3230_15 Datasheet, PDF (6/16 Pages) Linear Technology – 5-LED Main/Sub Display Driver with Dual LDO

LTC3230
TYPICAL PERFORMANCE CHARACTERISTICS
MLED/SLED Pin Current vs
MLED/SLED Pin Voltage
30
V_IN = 3.6V
25
20
15
10
5
0
0 0.04 0.08 0.12 0.16 0.20
MLED/SLED PIN VOLTAGE (V)
3230 G16
MLED/SLED Current vs ENM/ENS
Strobe Pulses
25
V_IN = 3.6V
R_SET = 17.7k
20
15
10
5
0
0
8
16
24
32
NUMBER OF STROBE PULSES
3230 G17
Efficiency vs V_IN Voltage
90
80
70
60
50
40
30
20 ^{C1 = C2 = C6 = 1μF}
5 LEDs AT 25mA/LED
10 ^VF ^{= 3.45V}
T_A = 25°C
0
2.7 3.1 3.5 3.9 4.3
V_IN (V)
4.7
3230 G18
LDO2 Dropout Voltage vs
Load Current
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0 25 50 75 100 125 150 175 200 225
LOAD CURRENT (mA)
3230 G19
Output Voltage Accuracy
vs Load Current
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
LDO1 and LDO2 Load Transient
Response
LDO2
50mV/DIV
AC COUPLED
LDO1
50mV/DIV
AC COUPLED
I_LDO
50mA/DIV
60mA
10mA
C_LDO = 1μF
40μs/DIV
3230 G21
–0.8
0
25 50 75 100 125 150 175 200
LOAD CURRENT (mA)
3230 G20
Output Voltage Accuracy
vs Temperature
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–0.35
–0.40
–0.45
–40 –20 0
20 40 60 80
TEMPERATURE (°C)
3230 G22
LDO1 and LDO2 Current Limit vs
Temperature
500
475
450
425
400
375
350
–40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3230 G23
3230fa
6