LTC3219 Datasheet, PDF (4/20 Pages) Linear Technology – 250mA Universal Nine Channel LED Driver

LTC3219
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Mode Switch Dropout Times
V_BAT = 3.6V
V_CPO
1V/DIV
1x
1.5x
2x
1.5x Mode CPO Ripple
V_CPO
20mV/DIV
AC COUPLED
V_BAT = 3.6V
I_CPO = 100mA
C_CPO = 2.2μF
2x Mode CPO Ripple
V_BAT = 3.6V
I_CPO = 100mA
C_CPO = 2.2μF
V_CPO
20mV/DIV
AC COUPLED
200μs/DIV
3219 G01
500ns/DIV
3219 G02
500ns/DIV
3219 G03
1x Mode Switch Resistance vs
Temperature
1.20
I_CPO = 100mA
1.15
1.10
V_BAT = 3.3V
1.05
V_BAT = 3.6V
1.00
V_BAT = 3.9V
0.95
0.90
0.85
0.80
0.75
0.70
–40 –15
10
35
60
85
TEMPERATURE (°C)
3219 G04
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2V_BAT – V_CPO)/I_CPO
7.50
V_BAT = 3V
7.25 _{VCPO = 4.8V}
7.00
C2 = C3 = 1μF
C4 = 2.2μF
6.75
6.50
6.25
6.00
5.75
5.50
5.25
5.00
–40 –15 10
35
60
85
TEMPERATURE (°C)
3219 G07
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5V_BAT – V_CPO)/I_CPO
6.50
V_BAT = 3V
6.25 _{VCPO = 4.2V}
6.00
C2 = C3 = 1μF
C4 = 2.2μF
5.75
5.50
5.25
5.00
4.75
4.50
4.25
4.00
–40 –15 10
35
60
85
TEMPERATURE (°C)
3219 G05
1.5x Mode CPO Voltage
vs I_CPO
4.8
C4 = 2.2μF
C2 = C3 = 1μF
4.6
V_BAT = 3.6V
4.4
4.2
4.0
3.8
3.6
0
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
50
100 150
I_CPO (mA)
200 250
3219 G06
2x Mode CPO Voltage
vs I_CPO
5.2
C4 = 2.2μF
5.1 C2 = C3 = 1μF
5.0
V_BAT = 3.6V
4.9
4.8
4.7
3.5V
4.6
3.4V
4.5
3.3V
3.2V
4.4
3.1V
4.3
3.0V
4.2
0
50 100 150 200 250 300
I_CPO (mA)
3219 G08
Oscillator Frequency
vs V_BAT Voltage
875
850
T_A = –40°C
825
T_A = 25°C
800
T_A = 85°C
775
2.7 3.1
3.5 3.9 4.3 4.7
V_BAT VOLTAGE (V)
5.1 5.5
3219 G09
3219fa
4