LTC3562 Datasheet, PDF (6/20 Pages) Linear Technology – I2C Quad Synchronous Step-Down DC/DC Regulator 2 × 600mA, 2 × 400mA

LTC3562
TYPICAL PERFORMANCE CHARACTERISTICS
R600A Feedback Voltage
vs Temperature
0.810 _{IOUT = 1mA}
0.808
0.806
0.804
0.802
0.800
0.798
0.796
0.794
0.792
0.790
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3562 G10
Dynamic Supply Current
vs Input Voltage
45
I_OUT = 0mA
V_OUT = 1.2V
40
Burst Mode OPERATION
35
30
FORCED Burst Mode
OPERATION
25
LDO MODE
20
2.7 3.1
3.5 3.9 4.3 4.7
V_IN VOLTAGE (V)
5.1 5.5
3562 G13
Oscillator Frequency
vs Temperature
2.5
2.4 ^VIN ^{= 5.5V}
2.3 _{VIN = 3V}
2.2 _{VIN = 2.7V}
2.1
V_IN = 3.8V
2.0
1.9
1.8
1.7
1.6
1.5
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
3562 G11
Output Voltage
vs Load Current (B Version)
1.220
1.215
V_IN = 3.8V
V_OUT = 1.2V (TYPE-B)
1.210
1.205
PULSE SKIP
1.200
1.195
1.190
0
100 200 300 400 500 600
LOAD CURRENT (mA)
3562 G12
Dynamic Supply Current
vs Input Voltage
Burst Mode Operation
6
I_OUT = 0mA
5
V_OUT600A
50mV/DIV
AC
COUPLED
4
SW
3
2V/DIV
2
1
0
2 2.5 3 3.5 4 4.5
VOLTAGE (V)
400mA – V_OUT = 1.2V
600mA – V_OUT = 1.2V
400mA – V_OUT = 1.8V
600mA – V_OUT = 1.8V
INDUCTOR
CURRENT
I_L = 100mA/
DIV
PULSE SKIP
OPERATION
5 5.5 6
3562 G14
400mA – V_OUT = 2.5V
600mA – V_OUT = 2.5V
400mA – V_OUT = 3.3V
600mA – V_OUT = 3.3V
PV_IN = 3.8V
LOAD = 50mA
2μs/DIV
3562 G15
Forced Burst Mode Operation
V_OUT600A
50mV/DIV
AC
COUPLED
SW
2V/DIV
INDUCTOR
CURRENT
I_L = 150mA/
DIV
PV_IN = 3.8V
LOAD = 50mA
2μs/DIV
3562 G16
6
Output Voltage vs Load Current
1.22
1.21
FORCED
Burst Mode
1.20
OPERATION
1.19
1.18
1.17
LDO MODE
1.16
1.15
1.14
1.13 ^VIN ^{= 3.8V}
V_OUT = 1.2V (TYPE-B)
1.12
0 20 40 60 80 100
LOAD CURRENT (mA)
120 140
3562 G17
Switch R_DS(ON) vs Input Voltage
700
600 ^{400mA PMOS}
400mA NMOS
500
600mA PMOS
400
300
600mA NMOS
200
100
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_IN VOLTAGE (V)
3562 G18
3562fa