LTC1143 Datasheet, PDF (4/20 Pages) Linear Technology – Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers

LTC1143/LTC1143L
LTC1143L-ADJ
TYPICAL PERFORMANCE CHARACTERISTICS
5V Output Efficiency
100
V_IN = 6V
95
90
V_IN = 10V
85
80
75
70
1
10
100
LOAD CURRENT (mA)
1000
LTC1143 G01
3.3V Efficiency vs Input Voltage
100
98
V_OUT = 3.3V
96
94
92
90
I_LOAD = 1A
88
I_LOAD = 100mA
86
84
82
80
0
4
8
12
INPUT VOLTAGE (V)
16
LTC1143 G04
DC Supply Current
2.1
NOT INCLUDING
1.8 GATE CHARGE CURRENT
PINS 5, 13
1.5
ACTIVE MODE
1.2
PER REGULATOR BLOCK
0.9
0.6
0.3
SLEEP MODE
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
LTC1143 • G07
3.3V Output Efficiency
100
95
V_IN = 5V
90
85
V_IN = 10V
80
75
70
1
10
100
LOAD CURRENT (mA)
1000
LTC1143 G02
Line Regulation
40
V_OUT = 5V
30 _{ILOAD = 1A}
20
10
0
–10
–20
–30
–40
0
4
8
12
INPUT VOLTAGE (V)
16
LTC1143 G05
Supply Current in Shutdown
20
18
PER LTC1143/LTC1143L
REGULATOR BLOCK
16 ^{PINS 5, 13}
V_SHUTDOWN = 2V
14
12
10
8
6
4
2
0
02
4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
LTC1143 G08
5V Efficiency vs Input Voltage
100
98
V_OUT = 5V
96
94
I_LOAD = 1A
92
90
88
I_LOAD = 100mA
86
84
82
80
0
4
8
12
16
INPUT VOLTAGE (V)
1143 G03
Load Regulation
20
0
–20
V_IN = 6V
R_SENSE = 0.05Ω
V_IN = 12V
–40
–60
–80
–100
0
V_IN = 6V
V_OUT = 5V
V_OUT = 3.3V
V_IN = 12V
0.5
1.0
1.5
2.0
2.5
LOAD CURRENT (A)
LTC1143 G06
Operating Frequency vs V_IN – V_OUT
1.6
V_OUT = 5V
1.4
0°C
1.2
25°C
1.0
70°C
0.8
0.6
0.4
0.2
0
0
2
4
6
8 10 12
(V_IN – V_OUT) VOLTAGE (V)
LTC1143 G09
4