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| MAX8775 Datasheet, PDF (9/30 Pages) Maxim Integrated Products – Dual and Combinable Graphics Core Controller for Notebook Computers | |||
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Dual and Combinable Graphics Core
Controller for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = 5V, SKIP_ = GND, TA = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
12V
MAX8775 toc16
A
0
12V
B
0
1.5V
C
1.2V
D
12V
E
2μs/div
A: LX1, 10V/div
B: LX2, 10V/div
C: VOUT1, 50mV/div
D: VOUT2, 50mV/div
E: VIN, 50mV/div
VIN = 12V, VOUT1 = 1.5V, VOUT2 = 1.2V
IOUT1 = 5A, IOUT2 = 5A
REFIN TRANSITION WAVEFORMS
(DTRANS = VCC)
MAX8775 toc17
1.5V
A
1.2V
12V
B
0
1.5V
C
1.2V
10A
0
D
100μs/div
A: REFIN1, 500mV/div C: VOUT1, 200mV/div
B: LX1, 10A/div
D: ILX1, 10A/div
VIN = 12V, VREFIN1 = 1.2V TO 1.5V TO 1.2V
IOUT1 = 1A
SKIP1 = GND
REFIN TRANSITION WAVEFORMS
(DTRANS = GND)
MAX8775 toc18
1.5V
A
1.2V
12V
B
0
1.5V
C
1.2V
0
D
40μs/div
A: REFIN1, 500mV/div C: VOUT1, 200mV/div
B: LX1, 10A/div
D: ILX1, 10A/div
VIN = 12V, VREFIN1 = 1.2V TO 1.5V TO 1.2V
IOUT1 = 1A
SKIP1 = GND
COMBINED-MODE PHASE TRANSITION
MAX8775 toc19
1.2V
A
0
B
12V
C
0
12V
D
0
10μs/div
A: VOUT, 50mV/div
B: ON2, 5V/div
C: LX1, 10V/div
D: LX2, 10V/div
VIN = 12V, VOUT = 1.2V
IOUT = 10A
COMBINED-MODE PHASE TRANSITION
MAX8775 toc20
1.2V
A
0
B
10A
C
0
10A
D
0
10μs/div
A: VOUT, 50mV/div
B: ON2, 5V/div
C: ILX2, 10A/div
D: ILX1, 10A/div
VIN = 12V, VOUT = 1.2V
IOUT = 10A
_______________________________________________________________________________________ 9
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