MAX8654ETX+T Maxim Integrated Products, MAX8654ETX+T Datasheet

IC REG STP DWN 12V 8A 36TQFN

MAX8654ETX+T

Manufacturer Part Number
MAX8654ETX+T
Description
IC REG STP DWN 12V 8A 36TQFN
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX8654ETX.pdf (17 pages)

Specifications of MAX8654ETX+T

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.6 ~ 11.9 V
Current - Output
8A
Frequency - Switching
250kHz ~ 1.2MHz
Voltage - Input
4.5 ~ 14 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
36-TQFN Exposed Pad
Power - Output
2.86W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8654 high-efficiency switching regulator delivers
up to 8A of load current at output voltages from 0.6V to
0.85 x V
ideal for on-board point-of-load and postregulation appli-
cations, with total output error less than ±1% over load,
line, and temperature ranges.
The MAX8654 is a fixed-frequency PWM mode regulator
with a switching frequency range of 250kHz to 1.2MHz
set by an external resistor or SYNC input. High-frequency
operation allows for an all-ceramic-capacitor solution. A
SYNCOUT output is provided to synchronize a second
regulator switching 180° out-of-phase with the first to
reduce the input ripple current and consequently reduce
the required input capacitance. The high operating fre-
quency minimizes the size of external components.
The on-board low R
the board cooler at heavy loads while minimizing the
critical inductances, making the layout a much simpler
task with respect to the discrete solutions.
The MAX8654 comes with a high-bandwidth (20MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the op-amp voltage-error amplifier permit a
type 3 compensation scheme to be utilized to achieve
maximum loop bandwidth, up to 20% of the switching
frequency. High loop bandwidth achieves fast transient
response resulting in less output capacitance required.
The MAX8654 offers programmable soft-start to accom-
modate different types of output capacitors and reduce
input inrush current. The MAX8654 is available in a 36-
lead thin QFN package.
19-0588; Rev 2; 7/09
Pin Configuration appears at end of data sheet.
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.
POL Power Supplies
Servers
DDR Memory
RAID Power Supplies
Network Power Supplies
Graphic Cards
IN
. The IC operates from 4.5V to 14V, making it
________________________________________________________________ Maxim Integrated Products
DS(ON)
General Description
dual-nMOS design keeps
Applications
♦ Internal 26mΩ R
♦ Guaranteed 8A Output Current
♦ Adjustable Overcurrent Protection
♦ 1% Output Accuracy Over Temperature
♦ Operates from 4.5V to 14V Supply
♦ Adjustable Output from 0.6V to 0.85 x V
♦ Soft-Start Reduces Inrush Supply Current
♦ 250kHz to 1.2MHz Adjustable Switching or SYNC
♦ Compatible with Ceramic, Polymer, and
♦ SYNCOUT Synchronizes 2nd Regulator 180°
♦ 36-Pin, Lead-Free, 6mm x 6mm Thin QFN Package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX8654ETX+
4.5V TO 14V
Input
Electrolytic Output Capacitors
Out-of-Phase
INPUT
Step-Down Regulator
PART
VL
IN
IN
VP
VL
VDL
FREQ
ILIM
REFIN
SS
EN
Typical Operating Circuit
12V, 8A 1.2MHz
MAX8654
-40°C to +85°C
TEMP RANGE
DS(ON)
GND
Ordering Information
SYNCOUT
PWRGD
COMP
PGND
SYNC
BST
LX
FB
MOSFETs
VL
36 Thin QFN-EP*
PACKAGE
Features
PIN-
IN
UP TO 8A
OUTPUT
1

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MAX8654ETX+T Summary of contents

Page 1

... DDR Memory RAID Power Supplies Network Power Supplies Graphic Cards Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. Step-Down Regulator ♦ Internal 26mΩ R ♦ ...

Page 2

Step-Down Regulator ABSOLUTE MAXIMUM RATINGS SYNC, VL, PWRGD to GND...................................-0.3V to +4.5V SYNCOUT, COMP, SS, FB, REFIN, ILIM, FREQ to GND .....................-0. VDL to PGND............................................................-0.3V to +6V VP, IN GND..................................................-0.3V to +16V LX ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 12V 5V VDL unless otherwise noted.) PARAMETER ERROR-AMPLIFIER FB Regulation Voltage Open-Loop Voltage Gain 1kΩ from COMP to GND Error-Amplifier Unity-Gain Parallel ...

Page 4

Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 12V 5V VDL unless otherwise noted.) PARAMETER SYNC SYNC Capture Range t LO SYNC Pulse Width ...

Page 5

12V OUT EFFICIENCY vs. LOAD CURRENT 100 OUT 1.8V OUT V = 3.3V 50 OUT ...

Page 6

Step-Down Regulator (Typical values are 12V OUT EXPOSED PAD TEMPERATURE vs. LOAD CURRENT 140 T = +85°C, NO AIR FLOW A 120 100 +25°C, NO AIR ...

Page 7

12V OUT LOAD TRANSIENT V OUT I OUT 20μs/div V SOFT-START WITH REFIN INTO A 0.5Ω LOAD V REFIN OUT V PWRGD 40μs/div _______________________________________________________________________________________ Step-Down Regulator Typical ...

Page 8

Step-Down Regulator PIN NAME 34, Power Ground. All PGND pins are internally connected. Connect all PGND pins externally to the power PGND 35, 36 ground plane. 5V LDO Output. VDL supplies the gate-drive current ...

Page 9

VL SHUTDOWN EN CONTROL BIAS GENERATOR VOLTAGE REFERENCE SS SOFT-START THERMAL SHUTDOWN ERROR AMPLIFIER REFIN FB COMP COMP LOW DETECTOR _______________________________________________________________________________________ Step-Down Regulator VL VDL UVLO REG REG CIRCUITRY CURRENT-LIMIT COMPARATOR ILIM THRESHOLD LX CONTROL LOGIC PWM COMPARATOR 1V P-P ...

Page 10

Step-Down Regulator INPUT 4.5V TO 14V 10μF 10μF VL 1μF 2.2μF 100kΩ 75kΩ 0.022μF Figure 1. Typical Application Circuit, 3.3V, 8A, 500kHz Detailed Description The MAX8654 high-efficiency, voltage-mode switching regulator is capable of delivering ...

Page 11

Controller Function The controller logic block is the central processor that determines the duty cycle of the high-side MOSFET under different line, load, and temperature conditions. Under normal operation, where the current-limit and temperature protection are not triggered, the controller ...

Page 12

Step-Down Regulator Undervoltage Lockout (UVLO) The UVLO circuitry inhibits switching when V is below 4.20V (typ below 3V. Once these VL voltages are above the thresholds, UVLO clears and the soft-start function activates; 100mV ...

Page 13

Output Capacitor Selection The key selection parameters for the output capacitor are capacitance, ESR, ESL, and voltage-rating require- ments. These affect the overall stability, output ripple voltage, and transient response of the DC-DC converter. The output ripple occurs due to ...

Page 14

Step-Down Regulator output voltage divided by the rated output current. ESR is the total equivalent series resistance (ESR) of the out- put filtering capacitor. If there is more than one output capacitor of the same type in ...

Page 15

The above equations provide accurate compensation when the zero-cross frequency is significantly higher than the double-pole frequency. When the zero-cross frequency is near the double-pole frequency, the actual zero-cross frequency is higher than the calculated fre- quency. In this case, ...

Page 16

Step-Down Regulator Pin Configuration TOP VIEW N. GND 32 MAX8654 N. PGND PGND 35 PGND 36 THIN QFN 16 ______________________________________________________________________________________ PROCESS: BiCMOS PWRGD 18 For the latest package ...

Page 17

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2009 Maxim Integrated Products 12V ...

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