Rainbow Electronics MAX15051 - Manual

General Description
The MAX15050/MAX15051 high-efficiency switching reg-
ulators deliver up to 4A load current at output voltages
from 0.6V to (0.9 x V
IN ). The devices operate from 2.9V
to 5.5V, making them ideal for on-board point-of-load
and postregulation applications. Total output-voltage
accuracy is within ±1% over load, line, and temperature.
The MAX15050/MAX15051 feature 1MHz fixed-frequen-
cy PWM operation. The MAX15050 features pulse-skip
mode to improve light-load efficiency. The MAX15050
soft-starts in a monotonic mode and then operates in
the forced PWM mode or pulse-skip mode depending
on the output load current condition. The MAX15051
soft-starts in the monotonic mode and operates in the
forced PWM mode. The high operating frequency
allows for small-size external components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical parasitic
inductances, making the layout a much simpler task with
respect to discrete solutions. Following a simple layout
and footprint ensures first-pass success in new designs.
The MAX15050/MAX15051 incorporate a high-bandwidth
(> 26MHz) voltage-error amplifier. The voltage-mode control
architecture and the voltage-error amplifier permit a type III
compensation scheme to achieve maximum loop band-
width, up to 200kHz. High loop bandwidth provides fast
transient response, resulting in less required output capaci-
tance and allowing for all-ceramic capacitor designs.
The MAX15050/MAX15051 feature an output overload
hiccup protection and peak current limit on both high-
side and low-side MOSFETs. These features provide for
ultra-safe operation in the cases of short-circuit condi-
tions, severe overloads, or in converters with bulk elec-
trolytic capacitors.
The MAX15050/MAX15051 feature an adjustable output volt-
age. The output voltage is adjustable by using two external
resistors at the feedback or by applying an external reference
voltage to the REFIN/SS input. The MAX15050/MAX15051
offer programmable soft-start time using one capacitor to
reduce input inrush current. A built-in thermal shutdown pro-
tection assures safe operation under all conditions. The
MAX15050/MAX15051 are available in a 2mm x 2mm,
16-bump (4 x 4 array), 0.5mm pitch WLP package.
Applications
Features
♦ Internal 18mΩ R
DS(ON) MOSFETs
♦ Pulse-Skip Mode for High-Efficiency Light Load
(MAX15050)
♦ Continuous 4A Output Current
♦ ±1% Output-Voltage Accuracy Over Load, Line,
and Temperature
♦ Operates from 2.9V to 5.5V Supply
♦ Adjustable Output from 0.6V to (0.9 x V
IN )
♦ Adjustable Soft-Start Reduces Inrush Supply Current
♦ Factory-Trimmed 1MHz Switching Frequency
♦ Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
♦ Safe Startup Into Prebias Output
♦ Enable Input/Power-Good Output
♦ Fully Protected Against Overcurrent and
Overtemperature
♦ Overload Hiccup Protection
♦ Sink/Source Current for DDR Applications
♦ 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch
WLP Package
MAX15050/MAX15051
High-Efficiency, 4A, 1MHz, Step-Down Regulators
with Integrated Switches in 2mm x 2mm Package
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-4915; Rev 2; 3/10
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE SKIP
MODE
M A X1 5 0 5 0 E WE + - 40°C to + 85°C 16 WLP Yes
M A X1 5 0 5 1 E WE + - 40°C to + 85°C 16 WLP No
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
OUTPUT
INPUT
2.9V TO 5.5V
BST
LX
IN
EN
V DD
GND
FB
V DD
COMP
PWRGD
REFIN/SS
GND
MAX15050
MAX15051
Typical Operating Circuit
Server Power Supplies
Point-of-Load
ASIC/CPU/DSP Core
and I/O Voltages
DDR Power Supplies
Base-Station Power
Supplies Telecom and
Networking Power
Supplies
RAID Control Power
Supplies
Portable Applications
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.