LTC1873 Linear Technology, LTC1873 Datasheet - Page 4

• Manufacturer Part Number: LTC1873
• Description: Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
• Manufacturer: Linear Technology

LTC1873
TYPICAL PERFOR A CE CHARACTERISTICS
4
100
5.0
4.5
2.0
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
4.0
3.5
3.0
2.5
90
80
70
– 50
–50
0
Efficiency vs Load Current
Supply Current vs Temperature
RUN/SS Source Current
vs Temperature
V
V
TEST CIRCUIT 1
C
CC
IN
L
– 25
–25
= 0pF
= 5V
= 5V
0
0
LOAD CURRENT (A)
TEMPERATURE ( C)
TEMPERATURE ( C)
5
V
V
V
OUT
OUT
OUT
25
25
BOOST1, BOOST2
= 3.3V
= 2.5V
= 1.6V
50
50
PV
V
CC
10
CC
75
75
W
100
100
1873 G07
1873 G01
1873 G04
U
125
125
15
20mV/
–0.5
–1.0
–1.5
–2.0
–2.5
DIV
2.5
2.0
1.5
1.0
0.5
70
40
60
50
30
20
10
0
0
–50
–50
Frequency Drift vs Temperature
Nonoverlap Time vs Temperature
Transient Response
TEST CIRCUIT 1
C
V
V
V
I
LOAD
CC
L
IN
OUT
2.2% MAX DEVIATION
TG FALLING EDGE
= 2000pF
–25
–25
BG RISING EDGE
= 5V
= 5V
= 1.8V
= 0A-10A-0A
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
25
10 s/DIV
25
BG FALLING EDGE
TG RISING EDGE
50
50
75
75
100
100
1873 G08
1873 G02
1873 G05
125
125
35
30
25
20
15
10
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
5
0
13
12
15
14
12
11
0
MOSFET Driver Supply Current
vs Gate Capacitance
–50
–50 –25
TEST CIRCUIT 1
ONE DRIVER LOADED
MULTIPLY BY # OF ACTIVE
DRIVERS TO OBTAIN TOTAL
DRIVER SUPPLY CURRENT
Driver R
Driver Rise/Fall vs Temperature
V
V
TEST CIRCUIT 1
C
PVCC
BOOST
L
= 2000pF
–25
2000
= 5V
GATE CAPACITANCE (pF)
– V
ON
SW
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
4000
vs Temperature
= 5V
25
25
6000
50
50
75
75
8000
100
100
1873 G03
1873 G06
1873 G09
10000
125
125