Datasheet

LTC3217
4
3217fa
TYPICAL PERFORMANCE CHARACTERISTICS
1x Mode Switch Resistance
vs Temperature
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5V
BAT
– V
CPO
)/I
CPO
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2V
BAT
– V
CPO
)/I
CPO
V
BAT
Shutdown Current
vs V
BAT
Voltage
Oscillator Frequency
vs Supply Voltage Effi ciency vs V
BAT
1.5x Mode CPO Output Ripple 2x Mode CPO Output Ripple
Charge Pump Mode Switching
and Input Current to Ground
(400mA Load)
TEMPERATURE (°C)
–40
0.35
SWITCH RESISTANCE (Ω)
0.40
0.45
0.50
0.55
0.60
0.65
–15 10 35 60
3217 G04
85
I
CPO
= 200mA
V
BAT
= 3.3V
V
BAT
= 3.9V
V
BAT
= 3.6V
TEMPERATURE (°C)
–40
2.0
SWITCH RESISTANCE (Ω)
2.2
2.4
2.6
2.8
3.0
3.2
–15 10 35 60
3217 G05
85
V
BAT
= 3V
V
CPO
= 4.2V
C2 = C3 = C4 = 2.2μF
TEMPERATURE (°C)
–40
2.6
SWITCH RESISTANCE (Ω)
2.8
3.0
3.2
3.4
3.6
3.8
–15 10 35 60
3217 G06
85
V
BAT
= 3V
V
CPO
= 4.8V
C2 = C3 = C4 = 2.2μF
V
BAT
VOLTAGE (V)
2.9
1.5
V
BAT
SHUTDOWN CURRENT (μA)
2.5
3.5
4.5
5.5
3.3 3.7
4.1
4.5
3217 G07
6.5
7.5
3.1 3.5
3.9
4.3
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
BAT
SUPPLY VOLTAGE (V)
2.9
880
FREQUENCY (kHz)
890
910
920
930
980
950
3.3
3.7
3.9
3217 G08
900
960
970
940
3.1 3.5
4.1
4.3
4.5
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
V
BAT
(V)
3
0
EFFICIENCY (P
LED
/PIN) (%)
10
30
40
50
100
70
3.4
3.8
4
3217 G09
20
80
90
60
3.2
3.6
4.2
4.4
TOTAL OUTPUT CURRENT
P
LED
/PIN
LED = 2015 HPW AOT
100mA
200mA
400mA
T
A
= 25°C unless otherwise noted.
V
CPO
50mV/DIV
AC-COUPLED
500ns/DIVV
BAT
= 3.6V
I
CPO
= 400mA
C
CPO
= 2.2μF
3217 G10
V
CPO
20mV/DIV
AC-COUPLED
500ns/DIV
3217 G11
V
BAT
= 3.6V
I
CPO
= 400mA
C
CPO
= 2.2μF
V
CPO
1V/DIV
I
VBAT
500mA/DIV
0
EN1
5V/DIV
1ms/DIV
1x
NO LOAD
1x
DROPOUT
DROPOUT
1.5x
2x
(5V)
V
IN
= 3.6V
3217 G12