Rainbow Electronics MAX767 - Manual (Page 3)

MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
_______________________________________________________________________________________ 3
100
50
0.001 0.1 10
EFFICIENCY vs. OUTPUT CURRENT
(1.5A CIRCUIT)
60
MAX767-01
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
0.01 1
100
50
0.001 0.1 10
EFFICIENCY vs. OUTPUT CURRENT
(3A CIRCUIT)
60
MAX767-02
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
0.01 1
100
50
0.001 0.1 10
EFFICIENCY vs. OUTPUT CURRENT
(5A CIRCUIT)
60
MAX767-03
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
0.01 1
100
50
0.001 0.1 10
EFFICIENCY vs. OUTPUT CURRENT
(7A CIRCUIT)
60
MAX767-04
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
0.01 1
IDLE-MODE WAVEFORMS
I LOAD = 300mA
3.3V OUTPUT
50mV/div, AC COUPLED
LX
5V/div
5µs/div
100
50
0.001 0.1 10
EFFICIENCY vs. OUTPUT CURRENT
(10A CIRCUIT)
60
MAX767-05
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
0.01 1
1000
0.01
0.001 1 100
SWITCHING FREQUENCY vs.
PERCENT OF FULL LOAD
0.1
MAX767-06
LOAD CURRENT (% FULL LOAD)
SWITCHING FREQUENCY (kHz)
1
10
100
0.01 0.1 10
SYNC = REF (300kHz)
PWM-MODE WAVEFORMS
I LOAD = 5A
3.3V OUTPUT
50mV/div, AC COUPLED
LX
5V/div
1µs/div
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1 (5A configuration), V IN = 5V, oscillator frequency = 300kHz, T A = +25°C, unless otherwise noted.)