MAX8566ETJ+ Maxim Integrated Products, MAX8566ETJ+ Datasheet

IC REG STP DWN 10A 32-TQFN

MAX8566ETJ+

Manufacturer Part Number
MAX8566ETJ+
Description
IC REG STP DWN 10A 32-TQFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX8566ETJ.pdf (20 pages)

Specifications of MAX8566ETJ+

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.6 ~ 3.1 V
Current - Output
10A
Frequency - Switching
250kHz ~ 4.2MHz
Voltage - Input
2.3 ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Power - Output
2.67W
Output Voltage
0.5 V
Input Voltage
2.3 V to 3.6 V
Switching Frequency
2 MHz
Operating Temperature Range
- 40 C to + 85 C
Mounting Style
SMD/SMT
Duty Cycle (max)
95 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8566 high-efficiency switching regulator deliv-
ers up to 10A load current at output voltages from 0.6V
to (0.87 x V
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
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 TQFN
package. The MAX8566 and all the required external
components fit into a footprint of less than 0.80in
19-3690; Rev 3; 3/11
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.
ASIC/CPU/DSP Core Voltages
POL Power Supplies
DDR Power Supplies
Base-Station Power Supplies
Fiber Power Supplies
Telecom Power Supplies
Network Power Supplies
IN
). The IC operates from 2.3V to 3.6V input
________________________________________________________________ Maxim Integrated Products
General Description
Internal-Switch Step-Down Regulator
Applications
DS(ON)
n-channel
2
.
High-Efficiency, 10A, PWM
o Internal 8mΩ On-Resistance MOSFETs
o 10A Output PWM Step-Down Regulator
o ±1% Output Accuracy over Load, Line, and
o Operates from 2.3V to 3.6V Input Supply
o Adjustable Output from 0.6V to (0.87 x V
o 250kHz to 2.4MHz Adjustable Frequency or SYNC
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 TQFN Package
o REFIN for DDR-Termination Application
+ Denotes lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configuration appears at end of data sheet.
MAX8566ETJ+
Temperature
Input
SYNC OUTPUT 180°
REFIN FOR
TRACKING
PROGRAMMABLE
MONOTONIC SS
POWER-GOOD
SYNC INPUT
FREQUENCY
SELECTION
PART
SYSTEM
ENABLE
OUTPUT
Typical Operating Circuit
REFIN
SS
EN
SYNC
FREQ
SYNCOUT
GND
FB
COMPENSATION
STEP-DOWN REGULATOR
-40°C to +85°C
TEMP RANGE
Ordering Information
TQFN 5mm x 5mm
MAX8566ETJ+
PGND
PGND
PGND
PGND
LX
LX
LX
LX
PIN-PACKAGE
32 TQFN-EP*
INPUT
2.25V TO 3.6V
Features
330nH/10A
L1
IN
)
OUTPUT
UP TO 10A
C5
2 x 22µF
6.3V
1

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MAX8566ETJ+ Summary of contents

Page 1

... Pin Configuration appears at end of data sheet. Features ) IN Ordering Information TEMP RANGE PIN-PACKAGE -40°C to +85°C 32 TQFN-EP* Typical Operating Circuit INPUT 2.25V TO 3.6V REFIN PGND SS PGND EN PGND SYNC PGND MAX8566ETJ+ FREQ STEP-DOWN REGULATOR LX TQFN 5mm x 5mm L1 SYNCOUT LX OUTPUT 330nH/10A UP TO 10A GND 22µF 6.3V COMPENSATION 1 ...

Page 2

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator ABSOLUTE MAXIMUM RATINGS EN/SS, EN, IN, SYNC LSS, PWRGD to GND ..........-0.3V to +4V (4.5V nonswitching) SYNCOUT, SS, COMP, FB, REFIN, FREQ to GND .........................................-0. Current (Note 1) ...

Page 3

Internal-Switch Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V PARAMETER FB Input Bias Current V FB REFIN Input Bias Current V REFIN V DD REFIN Common-Mode Range V ...

Page 4

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V SYNC PARAMETER SYNC Capture Range V DD Pulse Width V DD Input Threshold V DD Input ...

Page 5

Internal-Switch Step-Down Regulator ELECTRICAL CHARACTERISTICS ( 3.3V 0.5V PARAMETER IN and V Voltage Range DD LSS Voltage Range IN Supply Current Quiescent current Supply ...

Page 6

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V SYNC PARAMETER Switching Frequency V = 2.5V or 3.3V IN Minimum Off-Time V = 2.5V or ...

Page 7

Internal-Switch Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V PARAMETER SYNCOUT Frequency Range V DD Phase Shift from SYNC or Frequency = 1MHz Internal Oscillator I SYNCOUT Output ...

Page 8

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator (Typical values are 3.3V REFERENCE VOLTAGE vs. TEMPERATURE 0.65 0.64 0.63 0.62 0.61 0.60 0.59 0.58 0.57 0.56 0.55 - 120 TEMPERATURE (°C) ...

Page 9

Internal-Switch Step-Down Regulator (Typical values are 3.3V GAIN/PHASE OF THE VOLTAGE LOOP 0dB GAIN (10dB/div) 0° PHASE (45°/div FREQUENCY (kHz) FULL-LOAD SWITCHING WAVEFORMS 12A I L (2A/div) 10A 0A t ...

Page 10

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator (Typical values are 3.3V SOFT-START WITH REFIN 6. (5A/div 0.6V REFIN (500mV/div) 0V 1.8V V OUT (1V/div 400µs/div SOFT-START ...

Page 11

Internal-Switch Step-Down Regulator PIN NAME Monotonic Startup Enable/Disable. Connect MODE to GND or to the center tap of an external 1 MODE resistor-divider to enable/disable monotonic startup mode. Error-Amplifier Output. Connect the necessary compensation network from COMP to FB. COMP ...

Page 12

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator SHUTDOWN EN CONTROL BIAS GENERATOR VOLTAGE REFERENCE SS SOFT-START REFIN FB COMP COMP LOW DETECTOR MAX8566 Figure 1. Functional Diagram 12 ______________________________________________________________________________________ V DD UVLO CIRCUITRY CURRENT-LIMIT COMPARATOR ILIM THRESHOLD CONTROL ...

Page 13

Internal-Switch Step-Down Regulator Detailed Description The MAX8566 high-efficiency, voltage-mode switching regulator is capable of delivering up to 10A of output current. The MAX8566 provides output voltages from 0.6V to (0. from 2.3V to 3.6V input supplies, IN ...

Page 14

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator R1 REFIN R2 C MAX8566 Figure 2. Soft-Start Implementation with External Reference Undervoltage Lockout (UVLO) The UVLO circuitry inhibits switching when V below 2V. Once V rises above 2V, UVLO clears and DD the ...

Page 15

Internal-Switch Step-Down Regulator square wave at the desired synchronization frequency. A rising edge on SYNC triggers the internal SYNC cir- cuitry. The frequency of the input into SYNC must be higher than the internal oscillator frequency set ...

Page 16

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator The peak inductor current (I ) is: P − IN OUT = × I − × Use these equations for initial capacitor selection. Determine final values ...

Page 17

Internal-Switch Step-Down Regulator L LX MAX8566 FB R1 COMP Figure 4. Type 3 Compensation Network determined by the frequencies of the double pole and ESR zero of the power transfer function also a func- tion of the desired ...

Page 18

High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator GAIN (dB) POWER-STAGE TRANSFER FUNCTION Figure 5. Transfer Function for Type 3 Compensation 2) Connect input and output capacitors to the power ground plane; connect all other capacitors to the sig- nal ground plane. ...

Page 19

Internal-Switch Step-Down Regulator Pin Configuration TOP VIEW REFIN SYNC 28 MAX8566 FREQ 29 30 SYNCOUT GND THIN QFN *CONNECT ...

Page 20

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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