LTC3409_15 Datasheet, PDF (5/16 Pages) Linear Technology – 600mA Low VIN Buck Regulator in 3mm 3mm DFN

LTC3409
TYPICAL PERFORMANCE CHARACTERISTICS
(From Typical Application on the front page except for the resistive divider resistor values)
Oscillator Frequency
vs Temperature
2.70
2.60
2.50
2.40
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
–50
V_IN = 2.7V
V_IN = 1.6V
V_IN = 4.2V _{OSC 2.6MHz}
V_IN = 4.2V
OSC 1.7MHz
V_IN = 1.6V ^{VIN = 2.7V}
–25 0 25 50 75 100 125
TEMPERATURE (°C)
3409 G07
R_DS(ON) vs Input Voltage
0.450
0.400
0.350
0.300
MAIN
SWITCH
0.250
0.200
0.150
SYNCHRONOUS
SWITCH
0.100
0.050
0
1.5
2.5
3.5
4.5
5.5
INPUT VOLTAGE (V)
3409 G10
Dynamic Supply Current vs
Temperature, V_IN = 3.6V,
V_OUT = 1.5V, 0 Load
500
450
400
PULSE SKIP
350
300
250
200
150
100
BURST
50
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3409 G13
Oscillator Frequency Shift
vs Input Voltage
6
Output Voltage vs Load Current
V_IN = 1.6V
1.22
4
f_LOW
2
1.7MHz
0
f_HIGH
–2
2.6MHz
–4
–6
1.21
1.2V_OUT
BURST
1.20
1.2V_OUT
PULSE
SKIP
1.19
–8
–10
1.5
2.5
3.5
4.5
INPUT VOLTAGE (V)
5.5
3409 G08
1.18
0 100 200 300 400 500 600 700 800 900
LOAD CURRENT (mA)
3409 G09
R_DS(ON) vs Input Temperature
0.55
MAIN SWITCH
0.50
1.6V
0.45
4.2V
0.40
2.7V
1.6V
0.35
0.30
2.7V
0.25
4.2V
0.20
0.15
0.10
–50 –25
SYNCHRONOUS SWITCH
0 25 50 75 100 125
TEMPERATURE (°C)
3409 G11
Dynamic Input Current
vs Input Voltage
6000
5000
80
BURST/SLEEP
V_OUT = 1.5V
I_OUT = 0
70
V_FB = V_IN
60
4000
50
3000
40
V_OUT = 1.5V
2000
I_OUT = 0
30
20
PULSE
1000 _SKIP
V_FB = 0
10
0
0
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3409 G12
Switch Leakage vs Temperature
V_IN = 5.5V
6000
V_IN = 5.5V
5000
4000
3000
2000
1000
MAIN SWITCH
SYNCHRONOUS SWITCH
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3409 G14
Switch Leakage vs Input Voltage
45
40
35
30
25
MAIN SWITCH
20
15
10
SYNCHRONOUS
5
SWITCH
0
0
2
4
6
8
INPUT VOLTAGE (V)
3409 G15
3409fc
5