MAX1636 Maxim, MAX1636 Datasheet - Page 6

• Manufacturer Part Number: MAX1636
• Description: Low-Voltage / Precision Step-Down Controller for Portable CPU Power
• Manufacturer: Maxim

Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
6
100
400
350
300
250
200
150
100
_______________________________________________________________________________________
90
80
70
60
50
-1
-2
-3
-4
-5
50
5
4
3
2
1
0
1m
1m
0
V
IN
PWM MODE
V
EFFICIENCY vs. LOAD CURRENT
= 15V
OUT
0.5
= 5V
10m
10m
V
DROPOUT VOLTAGE
(1.8V/4A CIRCUIT)
vs. LOAD CURRENT
1.0
IN
LOAD CURRENT (A)
vs. LOAD CURRENT
LOAD CURRENT (A)
LOAD REGULATION
LOAD CURRENT (A)
= 7V
IN
1.5
100m
100m
= 7V, T
V
V
OUT
2.0
IN
= 22V
FORCED TO 4.95V
A
2.5
1
1
= +25°C, unless otherwise noted.)
3.0
10
10
3.5
250
225
200
175
150
125
100
100
75
50
90
80
70
60
50
40
35
30
25
20
15
10
5
0
150
1m
0
EFFICIENCY vs. LOAD CURRENT
5
200
VL LOAD-REGULATION ERROR
10 15 20 25
10m
vs. VL LOAD CURRENT
vs. OSC FREQUENCY
RESET TIME DELAY
250
VL LOAD CURRENT (mA)
(1.8V/7A CIRCUIT)
LOAD CURRENT (A)
300
F
OSC
V
100m
IN
(kHz)
V
= 15V
350
IN
30 35 40 45 50
= 7V
400
1
V
IN
450
= 22V
500
10
1000
0.10
0.01
100
0.6
0.5
0.4
0.3
0.2
0.1
10
LOAD-TRANSIENT RESPONSE
1
0
(3.3V/3A, PWM MODE)
0
0
10 20
REF LOAD-REGULATION ERROR
QUIESCENT SUPPLY CURRENT
5
100 s/div)
vs. REF LOAD CURRENT
vs. INPUT VOLTAGE
REF LOAD CURRENT ( A)
30
INPUT VOLTAGE (V)
10
40
15
50 60 70 80 90 100
20
V
OUT
4A
2A
0A
25
= 3.3V
LOAD
CURRENT
V
50mV/div
OUT
30