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MAX8643AETG Datasheet(PDF) 1 Page - Maxim Integrated Products

Part # MAX8643AETG
Description  3A, 2MHz Step-Down Regulator with Integrated Switches
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8643AETG Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX8643A high-efficiency switching regulator
delivers up to 3A load current at output voltages from
0.6V to (0.9 x VIN). The IC operates from 2.35V to 3.6V,
making it ideal for on-board point-of-load and postregu-
lation applications. Total output error is less than ±1%
over load, line, and temperature.
The MAX8643A features fixed-frequency PWM mode
operation with a switching frequency range of 500kHz
to 2MHz set by an external resistor. High-frequency
operation allows for an all-ceramic capacitor design.
The high operating frequency also allows for small-size
external components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical induc-
tances, 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 MAX8643A comes with a high-bandwidth (> 14MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the voltage-error amplifier permit a type III
compensation scheme to be utilized to achieve maxi-
mum loop bandwidth, up to 20% of the switching fre-
quency. High loop bandwidth provides fast transient
response, resulting in less required output capacitance
and allowing for all-ceramic capacitor designs.
The MAX8643A provides two three-state logic inputs to
select one of nine preset output voltages. The preset
output voltages allow customers to achieve ±1% out-
put-voltage accuracy without using expensive 0.1%
resistors. In addition, the output voltage can be set to
any customer value by either using two external resis-
tors at the feedback with 0.6V internal reference or
applying an external reference voltage to the REFIN
input. The MAX8643A offers programmable soft-start
time using one capacitor to reduce input inrush current.
The MAX8643A is available in a lead-free, 24-pin, 4mm
x 4mm thin QFN package.
Applications
POLs
ASIC/CPU/DSP Core and I/O Voltages
DDR Power Supplies
Base-Station Power Supplies
Telecom and Networking Power Supplies
RAID Control Power Supplies
Features
o Internal 37mΩ RDSON MOSFETs
o Continuous 3A Output Current
o ±1% Output Accuracy Over Load, Line,
and Temperature
o Operates from 2.35V to 3.6V Supply
o Adjustable Output from 0.6V to (0.9 x VIN)
o Soft-Start Reduces Inrush Supply Current
o 500kHz to 2MHz Adjustable Switching Frequency
o Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
o VID-Selectable Output Voltages
0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V
o Fully Protected Against Overcurrent
and Overtemperature
o Safe-Start into Prebiased Output
o Sink/Source Current in DDR Applications
o Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package
3A, 2MHz Step-Down Regulator
with Integrated Switches
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0767; Rev 2; 10/09
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.
PART
TEMP RANGE
PIN-PACKAGE
MAX8643AETG+
-40°C to +85°C
24 Thin QFN-EP*
MAX8643AETG/V+
-40°C to +85°C
24 Thin QFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
/V Denotes an automotive qualified part.
*
EP = Exposed pad.
Pin Configuration appears at end of data sheet.
OUTPUT
1.8V, 3A
INPUT
2.4V, 3.6V
BST
LX
OUT
IN
EN
VDD
CTL1
CTL2
PGND
FB
VDD
COMP
PWRGD
FREQ
REFIN
SS
GND
PREBIAS
MAX8643A
Typical Operating Circuit


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