User Manual

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)
MAX15050 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10.1
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)
MAX15050 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
10.1
50
60
70
80
90
100
40
0.01 10
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 2.5V