MAX1636 Datasheet, PDF (6/24 Pages) Maxim Integrated Products – Low-Voltage, Precision Step-Down Controller for Portable CPU Power

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