Instruction Manual

EFFICIENCY
vs. OUTPUT CURRENT
MAX15040 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
1
50
60
70
80
90
100
40
0.1 10
V
DD
= V
IN
= 3.3V
V
OUT
= 1.2V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
OUT
= 2.5V
EFFICIENCY
vs. OUTPUT CURRENT
MAX15040 toc02
OUTPUT CURRENT (A)
EFFICIENCY (%)
1
50
60
70
80
90
100
40
0.1 10
V
IN
= V
DD
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 1.5V
MAX15040
High-Efficiency, 4A, Step-Down Regulator with
Integrated Switches in 2mm x 2mm Package
4 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN TYP MAX UNITS
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Rising +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
RE F IN /S S
Power-Good Edge Deglitch V
FB
falling or rising 48
Clock
cycles
PWRGD Output-Voltage Low I
PWRGD
= 4mA (sinking) 0.03 0.15 V
PWRGD Leakage Current V
DD
= V
PWRGD
= 3.6V, V
FB
= 0.9V 0.01 µA
OVERCURRENT LIMIT (HICCUP MODE)
Current-Limit Startup Blanking 112
Clock
cycles
Restart Time 896
Clock
cycles
FB Hiccup Threshold V
FB
falling 70
% of
V
RE F IN /S S
Hiccup Threshold Blanking Time V
FB
falling 36 µs
Note 3: Specifications are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 4: Guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
DD
= 3.3V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, circuit of Figure 1, unless otherwise noted.) (Note 3)
Typical Operating Characteristics
(V
IN
= V
DD
= 3.3V, output voltage = 1.8V, I
LOAD
= 4A, and T
A
= +25°C, circuit of Figure 1, unless otherwise noted.)