MAX1639ESE Просмотр технического описания (PDF) - Maxim Integrated
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MAX1639ESE
Maxim Integrated
MAX1639ESE Datasheet PDF : 13 Pages
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High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
__________________________________________Typical Operating Characteristics
(TA = +25°C, using the MAX1639 evaluation kit, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(VOUT = 2.5V)
A
B
10µs/div
VIN = 5V, VOUT = 2.5V, LOAD = 8A
A: VOUT, 100mV/div, AC COUPLED
B: INDUCTOR CURRENT, 5A/div
FOLDBACK CURRENT LIMIT
(VOUT = 2.5V, NOMINAL)
A
B
10µs/div
A: VOUT = 0.5V/div
B: INDUCTOR CURRENT, 5A/div
STARTUP WAVEFORMS
A
B
400µs/div
A: INDUCTOR CURRENT, 2A/div
B: VOUT = 1V/div
SWITCHING WAVEFORMS
A
B
C
0
1µs/div
VIN = 5V, VOUT = 2.5V, LOAD = 0A
A: VOUT, 20mV/div
B: INDUCTOR CURRENT, 2A/div
C: LX, 5V/div
EFFICIENCY vs. OUTPUT CURRENT
100
3.5V
90
2.5V
80
1.8V
70
60
50
0.1
1
10
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
60
55
50
0
MAXIMUM DUTY CYCLE
vs. SWITCHING FREQUENCY
200 400 600 800 1000 1200
SWITCHING FREQUENCY (kHz)
4 _______________________________________________________________________________________
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