MAX8566_09 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator

19-3690; Rev 1; 2/09
EVAALVUAAILTAIOBNLEKIT
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
General Description
The MAX8566 high-efficiency switching regulator deliv-
ers up to 10A load current at output voltages from 0.6V
to (0.87 x V_IN). The IC operates from 2.3V to 3.6V input
supplies, making it ideal for point-of-load applications.
The total output-voltage set error is less than ±1% over
load, line, and temperature.
The MAX8566 operates in pulse-width-modulation
(PWM) mode with a 250kHz to 2.4MHz switching fre-
quency range that is programmable by an external
resistor. The IC can be synchronized to an external
clock in the same frequency range using the SYNC
input. The high operating frequency minimizes the size
of external components. Using low-R_DS(ON) n-channel
MOSFETs for both high- and low-side switches main-
tains high efficiency at both heavy-load and high-
switching frequencies.
The MAX8566 employs a voltage-mode control archi-
tecture with a high-bandwidth (> 10MHz) error amplifi-
er. The voltage-mode control architecture makes
switching frequencies greater than 1MHz possible,
achieving all-ceramic-capacitor designs to minimize PC
board space. The error amplifier works with Type 3
compensation to fully utilize the bandwidth of the high-
frequency switching to obtain fast transient response.
Adjustable soft-start time provides flexibility to minimize
input startup inrush current. An open-drain, power-
good (PWRGD) signal goes high when the output
reaches 90% of its regulation point.
The MAX8566 provides a SYNCOUT output to synchro-
nize a second MAX8566 or a second regulator switch-
ing 180° out-of-phase with the first to reduce the input
ripple current, which consequently reduces the input-
capacitance requirements. The MAX8566 also pro-
vides an external reference input (REFIN) for
output-tracking applications.
The MAX8566 is available in a 32-pin, 5mm x 5mm thin
QFN package. The MAX8566 and all the required exter-
nal components fit into a footprint of less than 0.80in².
Applications
ASIC/CPU/DSP Core Voltages
POL Power Supplies
DDR Power Supplies
Base-Station Power Supplies
Fiber Power Supplies
Telecom Power Supplies
Network Power Supplies
Features
o Internal 8mΩ On-Resistance MOSFETs
o 10A Output PWM Step-Down Regulator
o ±1% Output Accuracy over Load, Line, and
Temperature
o Operates from 2.3V to 3.6V Input Supply
o Adjustable Output from 0.6V to (0.87 x V_IN)
o 250kHz to 2.4MHz Adjustable Frequency or SYNC
Input
o Allows All-Ceramic-Capacitor Design
o SYNCOUT Drives 2nd Regulator 180° Out-of-Phase
o Prebiased or Monotonic Soft-Start
o Programmable Soft-Start Time
o Output Tracking or Sequencing
o Sourcing and Sinking Output Current
o Power-Good Output
o 32-Lead Thin QFN Package
o REFIN for DDR-Termination Application
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8566ETJ+
-40°C to +85°C 32 Thin QFN-EP*
+Denotes lead(Pb)/RoHS-compliant free package.
*EP = Exposed Pad.
Typical Operating Circuit
INPUT
2.25V TO 3.6V
REFIN FOR
TRACKING
SYSTEM
ENABLE
SYNC INPUT
PROGRAMMABLE
FREQUENCY
SYNC OUTPUT 180°
MONOTONIC SS
SELECTION
POWER-GOOD
OUTPUT
REFIN
SS
EN
SYNC
FREQ
SYNCOUT
MAX8566ETJ+
STEP-DOWN REGULATOR
TQFN 5mm x 5mm
GND
FB
PGND
PGND
PGND
PGND
LX
LX
LX
LX
L1
330nH/10A
OUTPUT
UP TO 10A
C5
2 x 22µF
6.3V
COMPENSATION
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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