Rainbow Electronics MAX15051 - Manual (Page 4)

MAX15050/MAX15051
High-Efficiency, 4A, 1MHz, Step-Down Regulators
with Integrated Switches in 2mm x 2mm Package
4 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN TYP MAX UNITS
EN Input Logic-High Threshold
(Rising)
1.5 V
EN Input Current V EN = 0 or 5V 0.01 1 µA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold +165
°C
Thermal-Shutdown Hysteresis 20 °C
POWER-GOOD (PWRGD)
V FB falling, V REFIN/SS = 0.6V 87 90 93
Power-Good Threshold Voltage
V FB rising, V REFIN/SS = 0.6V 92.5
% of
V REFIN/SS
Power-Good Edge Deglitch V FB falling or rising 48
Clock
cycles
PWRGD Output-Voltage Low I PWRGD = 4mA 0.03 0.15 V
PWRGD Leakage Current V PWRGD = 5V, V FB = 0.9V, V REFIN/SS = 0.6V 0.1 1 µA
OVERCURRENT LIMIT (HICCUP MODE)
Current-Limit Startup Blanking 112
Clock
cycles
Autoretry Restart Time 896
Clock
cycles
FB Hiccup Threshold V FB falling 70
% of
V REFIN/SS
Hiccup Threshold Blanking Time V FB falling 36 µs
Note 4: Specifications are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V EN = 5V, C VDD = 2.2µF, T A = -40°C to +85°C, typical values are at T A = +25°C, unless otherwise noted.) (Note 4)
Typical Operating Characteristics
(V IN = 5V, output voltage = 1.8V, I LOAD = 4A, and T A = +25°C, circuit of Figure 1, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 5V) (MAX15050)
M
AX15050 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
50
60
70
80
90
100
40
0.01 10
V OUT = 1.2V
V OUT = 3.3V
V OUT = 1.8V
V OUT = 2.5V
40
60
50
80
70
90
100
0.1 1 10
EFFICIENCY vs. LOAD CURRENT
V IN = 5V (MAX15051)
MAX15050 toc01b
LOAD CURRENT (A)
EFFICIENCY (%)
V OUT = 3.3V
V OUT = 2.5V
V
OUT
= 1.8V
V OUT = 1.2V
EFFICIENCY vs. LOAD CURRENT
(V
IN
= 3.3V) (MAX15050)
M
AX15050 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
1 0.1
50
60
70
80
90
100
40
0.01 10
V OUT = 1.8V
V OUT = 1.2V
V OUT = 2.5V