LTC3544B_15 Datasheet, PDF (4/18 Pages) Linear Technology – Quad Synchronous Step-Down Regulator

LTC3544B
Typical Performance Characteristics
V_REF vs Temperature at 2.25V,
3.6V, 5.5V
0.815
0.810
CHANNEL 200A
I_LOAD = 100mA
ALL CHANNELS OPERATING
0805
0.800
0.795
0.790
0.785
–50
V_IN = 2.25V
V_IN = 3.6V
V_IN = 5.5V
0
50
TEMPERATURE (°C)
100
3544B G01
Efficiency vs Load Current 300mA
Channel. All Other Channels Off
100
V_IN = 2.25V
90
V_IN = 3.6V
80
V_IN = 5.5V
70
60
50
40
30
20
10
0
0.0001
V_OUT = 1.8V
T_A = 25°C
ALL OTHER CHANNELS OFF
0.001
0.01
0.1
LOAD CURRENT (A)
1
3544B G04
Efficiency vs Load Current 100mA
Channel. All Other Channels Off
100
V_IN = 2.25V
90
V_IN = 3.6V
80
V_IN = 5.5V
70
60
50
40
30
20
10
0
0.0001
V_OUT = 1.2V
T_A = 25°C
ALL OTHER CHANNELS OFF
0.001
0.01
0.1
LOAD CURRENT (A)
1
3544B G07

Switching Frequency vs Supply
Voltage and Temperature
3.0
I_LOAD CHANNEL 100 = 50mA
ALL CHANNELS OPERATING
2.5
2.0
1.5
2
f_OSC –40°C
f_OSC 0°C
f_OSC 25°C
f_OSC 80°C
3
4
5
SUPPLY VOLTAGE (V)
6
3544B G02
Efficiency vs Load Current 200mA
Channel A. All Other Channels Off
90
V_IN = 2.25V
80
V_IN = 3.6V
V_IN = 5.5V
70
60
50
40
30
20
10
0
0.0001
V_OUT = 0.8V
T_A = 25°C
ALL OTHER CHANNELS OFF
0.001
0.01
0.1
LOAD CURRENT (A)
1
3544B G05
Efficiency vs Supply Voltage, All
Channels 50% Loaded
100
90
80
70
V_OUT100 = 1.2V
60
V_OUT200A = 0.8V
V_OUT200B = 1.5V
V_OUT300 = 1.8V
T_A = 25°C
50
2
3
4
SUPPLY VOLTAGE (V)
5
3544B G08
Efficiency vs Load Current 300mA
Channel. All Other Channels at
50% Peak Current
100
90
80
70
60
50
40
30
20
V_IN = 3.6V
V_OUT = 1.8V
10 T_A = 25°C
ALL OTHER CHANNELS LOADED 50%
0
0.0001 0.001
0.01
0.1
1
LOAD CURRENT 300mA CHANNEL (A)
3544B G03
Efficiency vs Load Current 200mA
Channel B. All Other Channels Off
100
V_IN = 2.25V
90
V_IN = 3.6V
80
V_IN = 5.5V
70
60
50
40
30
20
10
0
0.0001
V_OUT = 1.5V
T_A = 25°C
ALL OTHER CHANNELS OFF
0.001
0.01
0.1
LOAD CURRENT (A)
1
3544B G06
Load Regulation, All Channels
1.2
V_IN = 3.6V
1.0
T_A = 25°C
CHANNELS NOT UNDER
TEST HELD AT CONSTANT
0.8
50% MAXIMUM LOAD
100mA
0.6
200mA (A)
200mA (B)
0.4
300mA
0.2
0
–0.2
0
100
200
300
400
LOAD (mA)
3544B G09
3544bfb