LTC3716 Datasheet, PDF (5/28 Pages) Linear Technology – 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
(3 Operating Modes) (Figure 13)
100
Burst Mode
90 _OPERATION
80
70
FORCED
60
CONTINUOUS
50
MODE
40
30
20
10
0
0.01
CONSTANT
FREQUENCY
(BURST DISABLE)
V_IN = 5V
V_OUT = 1.6V
FREQ = 200kHz
0.1
1
10
100
LOAD CURRENT (A)
3716 G01
Supply Current vs Input Voltage
and Mode
1000
ON
800
600
400
200
SHUTDOWN
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3716 G04
Efficiency vs Load Current
(Figure 13)
100
80
60
40
20
0
0.1
V_IN = 5V
V_IN = 8V
V_IN = 12V
V_IN = 20V
V_OUT = 1.6V
V_EXTVCC = 0V
FREQ = 200kHz
V_FCB = 0V
1
10
100
LOAD CURRENT (A)
3716 G02
EXTV_CC Voltage Drop
250
200
150
100
50
0
0
10
20
30
40
50
CURRENT (mA)
3716 G05
Internal 5V LDO Line Reg
5.1
I_LOAD = 1mA
5.0
4.9
4.8
4.7
4.6
4.5
4.4
0
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3716 G07
Maximum Current Sense Threshold
vs Duty Factor
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
3716 G08
LTC3716
Efficiency vs Input Voltage
(Figure 13)
100
I_OUT = 20A
V_OUT = 1.6V
90
80
70
60
50
5
10
15
20
INPUT VOLTAGE (V)
3716 G03
INTV_CC and EXTV_CC Switch
Voltage vs Temperature
5.05
INTV_CC VOLTAGE
5.00
4.95
4.90
4.85
4.80
EXTV_CC SWITCHOVER THRESHOLD
4.75
4.70
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3716 G06
Maximum Current Sense Threshold
vs Percent of Nominal Output
Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0
25
50
75
100
PERCENT OF NOMINAL OUTPUT VOLTAGE (%)
3716 G09
5