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MAX8720ETX

Description
Switching Controllers
CategoryPower/power management    The power supply circuit   
File Size889KB,31 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX8720ETX Overview

Switching Controllers

MAX8720ETX Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerMaxim
Parts packaging codeQFN
package instruction6 X 6 MM, 0.80 MM HEIGHT, MO-220WJJD-1, TQFN-36
Contacts36
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage4.5 V
Nominal input voltage5 V
JESD-30 codeS-XQCC-N36
JESD-609 codee0
length6 mm
Humidity sensitivity level1
Number of functions1
Number of terminals36
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialUNSPECIFIED
encapsulated codeHVQCCN
Encapsulate equivalent codeLCC36,.25SQ,20
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency1000 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width6 mm
19-3319; Rev 2; 9/05
KIT
ATION
EVALU
BLE
AVAILA
Dynamically Adjustable 6-Bit VID
Step-Down Controller
Features
Quick-PWM Architecture
±1% V
OUT
Accuracy Over Line and Load
6-Bit On-Board DAC with Input Muxes
Precision-Adjustable V
OUT
Slew Control
0.275V to 1.850V Output Adjust Range
Remote Feedback and Ground Sense
Supports Voltage-Positioned Applications
2V to 28V Battery Input Range
200kHz/300kHz/550kHz/1000kHz Switching
Frequency
Over/Undervoltage Protection
Drives Large Synchronous-Rectifier FETs
800µA (typ) I
CC
Supply Current
10µA (typ) Shutdown Supply Current
2V ±0.75% Reference Output
PGOOD Blanking During Transition
General Description
The MAX8720 step-down controller is intended for core
CPU DC-DC converters in notebook computers. It fea-
tures a dynamically adjustable output, ultra-fast transient
response, high DC accuracy, and the high efficiency
needed for leading-edge CPU core power supplies.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant-on-time, PWM control scheme handles wide
input/output voltage ratios with ease and provides
100ns “instant-on” response to load transients while
maintaining a relatively constant switching frequency.
The output voltage can be dynamically adjusted through
the 6-bit digital-to-analog converter (DAC) over a 0.275V
to 1.850V range in 25mV steps. The MAX8720 has inde-
pendent four-level logic inputs for setting the suspend
voltage (S0-S1). Precision slew-rate control provides
“just-in-time” arrival at the new DAC setting, minimizing
surge currents to and from the battery. The internal DAC
of the MAX8720 is synchronized to the slew-rate clock
for improved operation under aggressive power man-
agement of newer chipsets and operating systems that
can make incomplete mode transitions. Remote feed-
back and ground-sense inputs allow easy compensa-
tion for IR drops in PC board traces.
Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the
battery) at a higher switching frequency allows the mini-
mum possible physical size.
The MAX8720 is available in a 28-pin QSOP or 36-pin
6mm x 6mm thin QFN package.
MAX8720
Ordering Information
PART
MAX8720EEI
MAX8720ETX
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
36 Thin QFN 6mm x 6mm
Minimal Operating Circuit
+5V BIAS
V
CC
SHDN
V
DD
V+
BST
DH
OUTPUT (V
OUT
)
0.275V TO 1.850V
INPUT (V
IN
)
7V TO 28V
Applications
CPU Core Supply Converters
GPU Core Supply Converters
Notebook and Subnotebook Computers
ILIM
AGND
SKIP
SUS
LX
MAX8720
DL
PGOOD
VID0
VID1
VID2
VID3
VID4
D0
D1
D2
D3
D4
D5
S0
PGND
FB
FBS
GNDS
CC
REF
TIME
S1
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
VID5
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX8720ETX Related Products

MAX8720ETX MAX8720EEI-T
Description Switching Controllers Switching Controllers Dyn Adj 6-Bit VID Step-Down Controller
Is it lead-free? Contains lead Contains lead
Is it Rohs certified? incompatible incompatible
Maker Maxim Maxim
Parts packaging code QFN SSOP
package instruction 6 X 6 MM, 0.80 MM HEIGHT, MO-220WJJD-1, TQFN-36 0.150 INCH, 0.025 INCH PITCH, MO-137AF, QSOP-28
Contacts 36 28
Reach Compliance Code not_compliant not_compliant
ECCN code EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 5.5 V 5.5 V
Minimum input voltage 4.5 V 4.5 V
Nominal input voltage 5 V 5 V
JESD-30 code S-XQCC-N36 R-PDSO-G28
JESD-609 code e0 e0
length 6 mm 9.89 mm
Number of functions 1 1
Number of terminals 36 28
Maximum operating temperature 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C
Package body material UNSPECIFIED PLASTIC/EPOXY
encapsulated code HVQCCN SSOP
Encapsulate equivalent code LCC36,.25SQ,20 SSOP28,.25
Package shape SQUARE RECTANGULAR
Package form CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 245 NOT SPECIFIED
Certification status Not Qualified Not Qualified
Maximum seat height 0.8 mm 1.73 mm
surface mount YES YES
Switch configuration PUSH-PULL PUSH-PULL
Maximum switching frequency 1000 kHz 1000 kHz
technology BICMOS BICMOS
Temperature level INDUSTRIAL INDUSTRIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form NO LEAD GULL WING
Terminal pitch 0.5 mm 0.635 mm
Terminal location QUAD DUAL
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED
width 6 mm 3.9 mm
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