Datasheet
LTC3409
5
3409fc
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
OSCILLATOR FREQUENCY (MHz)
2.10
2.40
2.70
2.60
2.50
2.20
2.30
1.90
2.00
1.60
1.70
1.30
1.40
25 75 125100
3409 G07
1.80
1.50
1.20
–25 0
50
V
IN
= 1.6V
V
IN
= 1.6V
V
IN
= 2.7V
V
IN
= 2.7V
OSC 2.6MHz
OSC 1.7MHz
V
IN
= 4.2V
V
IN
= 4.2V
INPUT VOLTAGE (V)
1.5
OSCILLATOR FREQUENCY SHIFT (%)
–2
0
2
f
LOW
1.7MHz
f
HIGH
2.6MHz
5.5
3409 G08
–4
–6
–10
2.5
3.5
4.5
–8
6
4
LOAD CURRENT (mA)
0
1.18
OUTPUT VOLTAGE (V)
1.19
1.20
1.21
1.22
100 200 300 400
3409 G09
500 600 700 800 900
1.2V
OUT
BURST
1.2V
OUT
PULSE
SKIP
Oscillator Frequency Shift
vs Input Voltage
Output Voltage vs Load Current
V
IN
= 1.6V
R
DS(ON)
vs Input Voltage
Dynamic Input Current
vs Input Voltage
INPUT VOLTAGE (V)
1.5
0
R
DS(0N)
(Ω)
0.050
0.150
0.200
0.250
3.5
5.5
0.450
3409 G10
0.100
2.5 4.5
0.300
0.350
0.400
MAIN
SWITCH
SYNCHRONOUS
SWITCH
R
DS(ON)
vs Input Temperature
TEMPERATURE (°C)
–50
0.35
0.40
1.6V
1.6V
2.7V
2.7V
4.2V
4.2V
0.50
0.55
25 75
3409 G11
0.30
0.25
–25 0
50 100 125
0.20
0.15
0.10
0.45
R
DS(ON)
(Ω)
SYNCHRONOUS SWITCH
MAIN SWITCH
INPUT VOLTAGE (V)
1.5
0
DYNAMIC SUPPLY CURRENT, PULSE SKIP (μA)
DYNAMIC SUPPLY CURRENT, BURST/SLEEP (μA)
1000
3000
4000
5000
6000
2.5
3.5
46
3409 G12
2000
23
4.5
5
5.5
0
20
50
60
70
40
10
30
80
PULSE
SKIP
BURST/SLEEP
V
FB
= V
IN
V
FB
= 0
V
OUT
= 1.5V
I
OUT
= 0
V
OUT
= 1.5V
I
OUT
= 0
Dynamic Supply Current vs
Temperature, V
IN
= 3.6V,
V
OUT
= 1.5V, 0 Load
Switch Leakage vs Temperature
V
IN
= 5.5V
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
4000
5000
6000
25 75
3409 G14
3000
2000
–25 0
50 100 125
1000
0
MAIN SWITCH
V
IN
= 5.5V
SYNCHRONOUS SWITCH
Switch Leakage vs Input Voltage
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (nA)
25
30
35
8
3409 G15
20
15
0
2
4
6
10
5
45
40
MAIN SWITCH
SYNCHRONOUS
SWITCH
TEMPERATURE (°C)
–50
0
DYNAMIC SUPLLY CURRENT (μA)
50
150
200
250
500
350
0
50
75
3409 G13
100
400
450
300
–25
25
100
125
PULSE SKIP
BURST
(From Typical Application on the front page except for the resistive divider resistor values)