LTC3407-4 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3407-4
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
95
LOAD = 100mA LOAD = 10mA
90
85
80
LOAD = 800mA
LOAD = 1mA
75
70
65
60
55 ^VOUT ^{= 1.8V}
Burst Mode OPERATION
50
2
3
4
5
6
INPUT VOLTAGE (V)
34074 G04
Reference Voltage vs
Temperature
0.615
V_IN = 3.6V
0.610
0.605
0.600
0.595
0.590
0.585
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
34074 G07
Efficiency vs Load Current
100
V_IN = 3.6V
V_IN = 2.7V
95
90
V_IN = 4.2V
85
80
75
70
65
V_OUT = 2.5V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60
1
10
100
1000
LOAD CURRENT (mA)
LTC1273/75/76 • F25
Oscillator Frequency vs
Temperature
2.5
V_IN = 3.6V
2.4
2.3
2.2
2.1
2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
34074 G05
R_DS(ON) vs Input Voltage
500
450
400
MAIN
SWITCH
350
300
SYNCHRONOUS
250
SWITCH
200
1
2
3
4
5
V_IN (V)
6
7
34074 G08
Efficiency vs Load Current
100
Burst Mode
90
OPERATION
80
70
60
1
PULSE SKIP
MODE
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
10
100
LOAD CURRENT (mA)
1000
34074 G11
4
Oscillator Frequency Deviation
vs Supply Voltage
10
8
6
4
2
0
–2
–4
–6
–8
–10
2
3
4
5
6
SUPPLY VOLTAGE (V)
34074 G06
R_DS(ON) vs Temperature
550
V_IN = 2.7V
500
450
V_IN = 4.2V ^{VIN = 3.6V}
400
350
300
250
200
150
MAIN SWITCH
100
SYNCHRONOUS SWITCH
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
34074 G09
Load Regulation
4
3
2
Burst Mode
1 OPERATION
0
PULSE SKIP
–1 ^MODE
–2
–3
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
–4
1
10
100
1000
LOAD CURRENT (mA)
34074 G12
34074f