LTC1704 Linear Technology, LTC1704 Datasheet - Page 6

• Manufacturer Part Number: LTC1704
• Description: 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
• Manufacturer: Linear Technology

LTC1704/LTC1704B
TYPICAL PERFOR A CE CHARACTERISTICS
6
–0.5
–3.0
–1.0
–1.5
–2.0
–2.5
0.5
5.5
5.0
4.5
4.0
3.5
3.0
30
25
20
15
10
0
5
0
0.9
0
0
Minimum V
V
I
REGDR
T
V
I
QEXT = D44H11
I
I
QEXT = D44H11
T
V
REGILM
REGILM
OUTREG
OUTREG
A
OUTREG
V
A
REGDR
OUTREG
= 25 C
= 25 C
0.1
1.3
0.4
= 9 A
= 9 A
= 2A
vs V
= 0V
= 1.5V
0.2
= –1%
Load Regulation
1.7
REGFB
CC
I
0.3
REGILM
0.8
V
I
OUTREG
V
OUTREG
vs V
REGFB
2.1
0.4
T
= 9 A
I
REGILM
OUTREG
A
(V)
(A)
(V)
1.2
= –40 C
0.5
2.5
= 6.2 A
T
0.6
A
W
1.6
= 25 C
2.9
0.7
1704 G18
1704 G21
1704 G28
U
3.3
0.8
2
0.03
0
–0.07
–0.10
–0.17
–0.20
– 0.03
–0.13
1100
1000
500
400
900
800
700
600
300
200
100
2.5
1.5
1.0
3.0
2.0
0
–50
0
Linear Regulator Start-Up Time
vs C
Linear Regulator Current Limit
Threshold vs Temperature
T
V
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
V
V
I
QEXT = D44H11
REGILM
A
OUTREG
INREG
OUTREG
– 50
= 25 C
–25
DELAY
Linear Regulator Dropout Voltage
vs Temperature
2000
I
V
REGDR
REGDR
= 1.8V
= 9 A
– 25
= 1.5V
= 1.5V
0
TEMPERATURE ( C)
I
REGILM
= –30mA
= 3.3V
4000
C
0
DELAY
25
TEMPERATURE ( C)
= 6.2 A
25
(pF)
6000
50
I
REGILM
50
75
8000
= 9 A
75
100
1704 G22
1704 G24
10000
100
125
1704 G19
125
I
V
LOAD
0.5
2.0
1.5
1.0
OUT
35
30
25
20
15
10
5
0
0
0
V
0
V
CH1: V
CH2: 0.1A to 2.1A LOAD, 1A DIV
I
REGDR
T
V
V
I
QEXT = D44H11
OUTREG
OUTREG
REGILM
A
INREG
OUTREG
= 25 C
OUTREG
0.5
2
= 1.8V
vs I
= 9 A
= 1.5V
vs Load Current
0.1A to 2.1A Load Step
= 1.5V, AC 50mV/DIV
REGILM
1
4
I
I
REGILM
OUTREG
50 s/DIV
1.5
6
( A)
(A)
2
8
2.5
10
1704 G23
1704 G25
1704bfa
1704 G20
12
3