User Manual
MAX15050/MAX15051
High-Efficiency, 4A, 1MHz, Step-Down Regulators
with Integrated Switches in 2mm x 2mm Package
_______________________________________________________________________________________ 3
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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
COMP
COMP Clamp Voltage High V
DD
= 2.9V to 5V, V
FB
= 0.5V, V
REFIN/SS
= 0.6V 2 V
COMP Clamp Voltage Low V
DD
= 2.9V to 5V, V
FB
= 0.7V, V
REFIN/SS
= 0.6V 0.68 V
COMP Slew Rate V
FB
= 0.7V to 0.5V, V
REFIN/SS
= 0.6V 1.4 V/µs
COMP Shutdown Resistance
From COMP to GND, V
IN
= 3.3V, V
COMP
= 100mV,
V
EN
= V
REFIN/SS
= 0V
6
ERROR AMPLIFIER
FB Regulation Accuracy Using
External Resistors
0.594 0.6 0.606 V
Open-Loop Voltage Gain 115 dB
Error-Amplifier Unity-Gain
Bandwidth
26 MHz
Error-Amplifier Common-Mode
Input Range
V
DD
= 2.9V to 3.5V 0 V
DD
- 2 V
V
FB
= 0.7V, sink 1
Error-Amplifier Maximum Output
Current
V
COMP
= 1V, no switching,
V
REFIN/SS
= 0.6V
V
FB
= 0.5V, source -1
mA
FB Input Bias Current V
FB
= 0.7V 70 nA
REFIN/SS
REFIN/SS Common-Mode Range V
DD
= 2.9V to 3.5V 0 V
DD
- 2 V
REFIN/SS Charging Current V
REFIN/SS
= 0.45V 6 8 10 µA
REFIN/SS Offset Voltage V
REFIN/SS
= 0.9V, FB shorted to COMP -4.5 +4.5 mV
REFIN/SS Pulldown Resistance V
IN
= V
DD
= 3.3V, V
REFIN/SS
= 0.1V 300
LX (ALL BUMPS COMBINED)
LX On-Resistance, High Side I
LX
= -500mA V
IN
= V
BST
- V
LX
= 3.3V 24 54 m
LX On-Resistance, Low Side I
LX
= 500mA V
IN
= 3.3V 18 50 m
High-side sourcing 5.4 8
Low-side sourcing 7
Low-side sinking 7
Zero-crossing current threshold 0.2
Skip high-side sourcing 0.58
A
LX Current-Limit Thresholds V
IN
= 3.3V
Sink current-limit DAC steps 4 Steps
V
LX
= 0V -10
LX Leakage Current V
EN
= 0V
V
LX
= 5V 10
µA
LX Switching Frequency V
IN
= 3.3V 0.9 1 1.1 MHz
LX Maximum Duty Cycle V
IN
= 3.3V 90 96 %
LX Minimum On-Time V
IN
= 3.3V 80 ns
RMS LX Output Current 4 A
ENABLE
EN Input Logic-Low Threshold
(Falling)
0.7 V