ltc3827ig-1 Linear Technology Corporation, ltc3827ig-1 Datasheet - Page 5

• Manufacturer Part Number: ltc3827ig-1
• Description: Low Iq, Dual, 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR A CE CHARACTERISTICS
CONTINUOUS
BURST MODE
SKIPPING
100
–40
–20
350
300
250
200
150
100
FORCED
80
60
40
20
50
2A/DIV
PULSE
0
MODE
MODE
0
Maximum Current Sense Voltage
vs I
0
Total Input Supply Current
vs Input Voltage
FIGURE 13 CIRCUIT
5
TH
FIGURE 13 CIRCUIT
V
I
0.2
Inductor Current at Light Load
LOAD
OUT
PULSE SKIPPING
FORCED CONTINUOUS
BURST MODE (RISING)
BURST MODE (FALLING)
10
300μA LOAD
NO LOAD
Voltage
= 3.3V
= 300μA
0.4
I
TH
INPUT VOLTAGE (V)
15
PIN VOLTAGE (V)
0.6
20
4μs/DIV
0.8
10% Duty Cycle
25
1.0
W
1.2
30
38271 G13
38271 G10
U
1.4
38271 G07
35
–100
–200
–300
–400
–500
–600
–700
200
100
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0
–45
EXTV
Voltages vs Temperature
Sense Pins Total Input
Bias Current
0
Soft Start-Up
FIGURE 13 CIRCUIT
V
1
–25
SENSE
CC
2
Switchover and INTV
COMMON MODE VOLTAGE (V)
–5
TEMPERATURE (°C)
3
4
15
20ms/DIV
5
35
INTV
EXTV
EXTV
6
CC
CC
CC
55
7
RISING
FALLING
8
CC
75
38271 G14
38271 G11
9
2V/DIV
2V/DIV
V
V
OUT2
OUT1
38271 G08
95
10
5.30
5.00
5.50
5.45
5.40
5.35
5.25
5.20
5.15
5.10
5.05
120
100
80
60
40
20
0
0
INTV
Maximum Current Sense
Threshold vs Duty Cycle
0
Tracking Start-Up
FIGURE 13 CIRCUIT
10
5
CC
20
Line Regulation
10
INPUT VOLTAGE (V)
30
DUTY CYCLE (%)
LTC3827-1
15
40
20ms/DIV
20
50
60
25
70
30
80
35
2V/DIV
2V/DIV
38271 G15
38271fd
90
V
V
38271 G12
5
OUT2
OUT1
38271 G09
100
40