Rainbow Electronics MAX8760 - Manual (Page 11)

MAX8760
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
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POWER-UP SEQUENCE
MAX8760 toc17
0
3.3V
0
0
0
1.46V
0
B
C
D
E
A
2ms/div
A. SHDN, 5V/div
B. VROK, 5V/div
C. 1.5V OUTPUT, 1V/div
R LOAD = 75m Ω
D. I L1 , 10A/div
E. I L2 , 10A/div
SOFT-SHUTDOWN WAVEFORMS
MAX8760 toc19
3.3V
10A
10A
1.46V
B
C
D
A
200 µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 500mV/div
C. I
L1 , 10A/div
D. I L2 , 10A/div
R LOAD = 75m Ω
1.30V LOAD TRANSIENT
(10A TO 30A LOAD)
MAX8760 toc20
15A
1.48A
1.44V
5A
5A
15A
B
C
A
20 µs/div
A. I L1 , 10A/div
B. I L2 , 10A/div
C. OUTPUT VOLTAGE, 20mV/div
OFFSET TRANSITION
MAX8760 toc21
0.2V
5A
5A
0
1.5V B
C
D
A
20 µs/div
A. V OFS = 0 TO 200mV, 0.2V/div
B. V OUT = 1.500V TO 1.475V, 20mV/div
C. I
L1
, 10A/div
D. I L2 , 10A/div
10A LOAD
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V IN = 12V, V CC = V DD = 5V, SHDN = SKIP = V CC , D0–D5 set for 1.5V (SUS = GND), S0 and S1 set for 1V
(SUS = V CC ), OFS = GND, T A = +25°C, unless otherwise specified.)
SOFT-START
MAX8760 toc18
3.3V
0
0
0
0
B
C
D
A
200 µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 500mV/div
C. I
L1 , 10A/div
D. I L2 , 10A/div
R LOAD = 75m Ω