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LTC1873 Datasheet (HTML) - Linear Technology

Part No. LTC1873
Description  Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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4
LTC1873
10
µs/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
TEMPERATURE (
°C)
–50
2.4
PVCC
VCC
25
1873 G04
1.8
1.4
–25
0
50
1.2
1.0
2.6
2.2
2.0
1.6
75
100
125
BOOST1, BOOST2
TEST CIRCUIT 1
CL = 0pF
Transient Response
TEMPERATURE (
°C)
–50
–2.5
–2.0
–1.0
–0.5
0
2.5
1.0
0
50
75
1873 G05
–1.5
1.5
2.0
0.5
–25
25
100
125
VCC = 5V
TEMPERATURE (
°C)
–50
0.4
0.5
0.7
0.8
0.9
1.4
1.1
0
50
75
1873 G06
0.6
1.2
1.3
1.0
–25
25
100
125
VPVCC = 5V
VBOOST – VSW = 5V
MOSFET Driver Supply Current
vs Gate Capacitance
Supply Current vs Temperature
Frequency Drift vs Temperature
Driver RON vs Temperature
RUN/SS Source Current
vs Temperature
TEMPERATURE (
°C)
–50
4.0
4.5
5.0
25
75
1873 G07
3.5
3.0
–25
0
50
100
125
2.5
2.0
VCC = 5V
Nonoverlap Time vs Temperature
Driver Rise/Fall vs Temperature
LOAD CURRENT (A)
0
70
80
90
100
510
1873 G01
15
VIN = 5V
VOUT = 3.3V
VOUT = 2.5V
VOUT = 1.6V
VIN = 5V
VOUT = 1.8V
ILOAD = 0A-10A-0A
±2.2% MAX DEVIATION
1873 G02
GATE CAPACITANCE (pF)
0
25
30
35
6000
8000
1873 G03
20
15
2000
4000
10000
10
5
0
TEST CIRCUIT 1
ONE DRIVER LOADED
MULTIPLY BY # OF ACTIVE
DRIVERS TO OBTAIN TOTAL
DRIVER SUPPLY CURRENT
TEMPERATURE (
°C)
–50
40
50
70
25
75
1873 G08
30
20
–25
0
50
100
125
10
0
60
TEST CIRCUIT 1
CL = 2000pF
BG FALLING EDGE
TG RISING EDGE
TG FALLING EDGE
BG RISING EDGE
TEMPERATURE (
°C)
–50
–25
12
12
15
0
50
75
1873 G09
11
14
13
25
100
125
TEST CIRCUIT 1
CL = 2000pF
20mV/
DIV



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