User Manual

MAX15050/MAX15051
High-Efficiency, 4A, 1MHz, Step-Down Regulators
with Integrated Switches in 2mm x 2mm Package
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, PWRGD to GND..................................................-0.3V to +6V
V
DD
to GND..................-0.3V to the lower of +4V or (V
IN
+ 0.3V)
COMP, FB, REFIN/SS to GND....................-0.3V to (V
DD
+ 0.3V)
EN to GND................................................................-0.3V to +6V
BST to LX..................................................................-0.3V to +6V
BST to GND ............................................................-0.3V to +12V
LX to GND ....................-0.3V to the lower of +6V or (V
IN
+ 0.3V)
LX to GND (Note 1) ..-1V to the lower of +6V or (V
IN
+ 1V) for 50ns
I
LX(RMS)
....................................................................................6A
V
DD
Output Short-Circuit Duration .............................Continuous
Converter Output Short-Circuit Duration ....................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Bump (4 x 4 Array), 0.5mm Pitch WLP
(derate 20.4mW/°C above +70°C)..............................1000mW
Thermal Resistance (Note 2)
θ
JA
.................................................................................49°C/W
θ
JC
...................................................................................9°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Operating Junction Temperature
at Maximum Current (Note 3)........................................+105°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (soldering, 10s) ..........................+260°C
Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s power dissipation limit of the device.
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
Note 3: Operating the junction temperature above +105°C will degrade the life of the device.
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN Voltage Range 2.9 5.5 V
V
IN
= 3.3V 4.8 8
IN Supply Current No load, no switching
V
IN
= 5V 5.3 8.5
mA
Total Shutdown Current from IN V
IN
= V
BST
- V
LX
= 5V, V
EN
= 0V 10 20 µA
V
DD
rising 2.6 2.8
V
DD
Undervoltage Lockout
Threshold
LX starts/stops switching,
no load
V
DD
falling 2.35 2.55
V
V
DD
Undervoltage Deglitching 10 µs
V
DD
Output Voltage I
VDD
= 0 to 10mA 3.1 3.3 3.5 V
V
DD
Dropout V
IN
= 2.9V, I
VDD
= 10mA 0.09 V
V
DD
Current Limit V
DD
= 0V 20 37 mA
BST
MAX15050, V
BST
= 5V, V
LX
= 0V, no switching 10
BST Supply Current
MAX15051, V
IN
= V
LX
= 3.3V, V
BST
= 6.6V,
no switching
250
µA
IN to BST On-Resistance V
IN
= 3.3V, I
IN
= 0.16A 4 
PWM COMPARATOR
PWM Comparator Propagation
Delay
10mV overdrive 20 ns
PWM Peak-to-Peak Ramp
Amplitude
1 V
PWM Valley Amplitude 0.76 V