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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15108A Datasheet

Synchronous Step-Down Switching Regulator

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MAX15108A
EVALUATION KIT AVAILABLE
High-Efficiency, 8A, Current-Mode
Synchronous Step-Down Switching Regulator
General Description
The MAX15108A high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated power
switches delivers up to 8A of output current. The regula-
tor operates from 2.7V to 5.5V and provides an output
voltage from 0.6V up to 95% of the input voltage, making
the device ideal for distributed power systems, portable
devices, and preregulation applications.
The IC utilizes a current-mode control architecture with a
high gain transconductance error amplifier. The current-
mode control architecture facilitates easy compensation
design and ensures cycle-by-cycle current limit with fast
response to line and load transients.
The low RDS(ON) integrated switches ensure high effi-
ciency at heavy loads while minimizing critical induc-
tance, making the layout design a much simpler task with
respect to discrete solutions. The IC’s simple layout and
footprint assures first-pass success in new designs.
The regulator features a 1MHz, factory-trimmed fixed-
frequency PWM mode operation. The high switching
frequency, along with the PWM current-mode architecture
allows for a compact, all ceramic capacitor design.
The IC features a capacitor-programmable soft-start
to reduce input inrush current. Internal control circuitry
ensures safe-startup into a prebiased output. Power
sequencing is controlled with the enable input and power-
good output.
The IC is available in a 20-bump (4 x 5 array), 2.5mm x
2mm, WLP package and is fully specified over the -40°C
to +105°C temperature range.
Applications
● Distributed Power Systems
● DDR Memory
● Base Stations
● Portable Devices
● Notebook Power
● Server Power
Ordering Information appears at end of data sheet.
Features
● Continuous 8A Output Current
● Efficiency Up to 96%
● ±1% Accuracy Over Load, Line, and Temperature
● Operates from a 2.7V to 5.5V Supply
● Adjustable Output from 0.6V to 0.95 x VIN
● Programmable Soft-Start
● Safe Startup into Prebiased Output
● External Reference Input
● 1MHz Switching Frequency
● Stable with Low-ESR Ceramic Output Capacitors
● Forced PWM Mode
● Enable Input and Power-Good Output for Power-
Supply Sequencing
● Cycle-by-Cycle Overcurrent Protection
● Fully Protected Features Against Overcurrent and
Overtemperature
● Input Undervoltage Lockout
● 20-Bump (4 x 5 Array), 2.5mm x 2mm, WLP Package
Typical Operating Circuit
2.7V TO
5.5V
LX
EN PGND
IN
MAX15108A
FB
INX
PGOOD
COMP
SS
OUTPUT
19-6702; Rev 1; 5/16


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15108A Datasheet

Synchronous Step-Down Switching Regulator

No Preview Available !

MAX15108A
High-Efficiency, 8A, Current-Mode
Synchronous Step-Down Switching Regulator
Absolute Maximum Ratings
IN, PGOOD to PGND...............................................-0.3V to +6V
LX to PGND................................................-0.3V to (VIN + 0.3V)
LX to PGND.................................... -1V to (VIN + 0.3V) for 50ns
EN, COMP, FB, SS to PGND......................-0.3V to (VIN + 0.3V)
Continuous LX Current (Note 1)............................. -12A to +12A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TBOARD = +70°C)
WLP (derate 31.7mW/°C above TBOARD = +70°C).......1.27W
Operating Temperature Range.......................... -40°C to +105°C
Operating Junction Temperature (Note 2)........................ +125°C
Storage Temperature Range............................. -65°C to +150°C
Soldering Temperature (reflow) (Note 3).......................... +260°C
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.
Note 1: LX has internal clamp diodes to PGND and IN. Do not exceed the power dissipation limits of the device when forward
biasing these diodes.
Note 2: Limit the junction temperature to +125°C for continuous operation at full current.
Note 3: The WLP package is constructed using a unique set of package techniques that impose a limit on the thermal profile the
device can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles
recommended in the industry-standard specification JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
Package Thermal Characteristics (Note 4)
WLP
Junction-to-Ambient Thermal Resistance (θJA)........31.5°C/W
Note 4: 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.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VIN = 5V, CSS = 4.7nF, TA = TJ = -40°C to +105°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 4)
PARAMETER
IN Voltage Range
IN Shutdown Supply Current
IN Supply Current
VIN Undervoltage Lockout Threshold
VIN Undervoltage Lockout Hysteresis
ERROR AMPLIFIER
Transconductance
Voltage Gain
FB Set-Point Accuracy
FB Input Bias Current
COMP to Current-Sense
Transconductance
COMP Clamp Low
Compensation RAMP Valley
POWER SWITCHES
High-Side Switch Current-Limit
Threshold
SYMBOL
VIN
IIN
CONDITIONS
VEN = 0V
VEN = 5V, VFB = 0.75V, not switching
LX starts switching, VIN rising
LX stops switching, VIN falling
gMV
AVEA
VFB
IFB
GMOD
Over line, load, and temperature
VFB = 0.75V
IHSCL
MIN TYP MAX
2.7 5.5
0.3 3
3.4 6
2.6 2.7
200
594
-100
1.4
90
600
25
0.93
1
606
+100
14
Low-Side Switch Sink
Current-Limit Threshold
14
Low-Side Switch Source
Current-Limit Threshold
14
UNITS
V
µA
mA
V
mV
mS
dB
mV
nA
A/V
V
V
A
A
A
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX15108A
Description Synchronous Step-Down Switching Regulator
Maker Maxim Integrated Products
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MAX15108A Datasheet PDF






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