LTC1702 Datasheet, PDF (4/36 Pages) Linear Technology – Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

LTC1702
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
100
V_IN = 5V
V_OUT = 3.3V
V_OUT = 2.5V
90
V_OUT = 1.6V
80
Transient Response
V_IN = 5V
V_OUT = 1.8V
I_LOAD = 0A-10A-0A
±2.2% MAX DEVIATION
20mV/
DIV
70
0
5
10
LOAD CURRENT (A)
15
1702 G01
Supply Current vs Temperature
2.6
TEST CIRCUIT 1
2.4 ^CL ^{= 0pF}
2.2
2.0
PV_CC
V_CC
1.8
1.6
1.4
BOOST1, BOOST2
1.2
1.0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1702 G04
RUN/SS Source Current
vs Temperature
5.0
V_CC = 5V
4.5
4.0
3.5
3.0
2.5
2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1702 G07
10µs/DIV
1702 G02
Normalized Frequency
vs Temperature
2.5
V_CC = 5V
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1702 G05
Nonoverlap Time vs Temperature
70
TEST CIRCUIT 1
60 ^{CL = 2000pF}
TG FALLING EDGE
50 _{BG RISING EDGE}
40
BG FALLING EDGE
30
TG RISING EDGE
20
10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1702 G08
MOSFET Driver Supply Current
vs Gate Capacitance
35
TEST CIRCUIT 1
ONE DRIVER LOADED
30 _{MULTIPLY BY # OF ACTIVE}
DRIVERS TO OBTAIN TOTAL
25 DRIVER SUPPLY CURRENT
20
15
10
5
0
0 2000 4000 6000 8000 10000
GATE CAPACITANCE (pF)
1702 G03
Driver R_ON vs Temperature
1.4
V_PVCC = 5V
1.3 _{VBOOST – VSW = 5V}
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1702 G06
Driver Rise/Fall vs Temperature
15
TEST CIRCUIT 1
C_L = 2000pF
14
13
12
11
12
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1702 G09
4