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MAX1953EUB

Description
Switching Controllers Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
CategoryPower/power management    The power supply circuit   
File Size423KB,22 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1953EUB Overview

Switching Controllers Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers

MAX1953EUB Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
Parts packaging codeTSSOP
package instructionTSSOP, TSSOP10,.19,20
Contacts10
Reach Compliance Codenot_compliant
ECCN codeEAR99
Factory Lead Time1 week
Other featuresALSO OPERATES IN CURRENT MODE
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage3 V
Nominal input voltage5 V
JESD-30 codeS-PDSO-G10
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals10
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current10 A
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP10,.19,20
Package shapeSQUARE
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)240
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency1200 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn85Pb15)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
Base Number Matches1
19-2373; Rev 0; 4/02
KIT
ATION
EVALU
E
BL
AVAILA
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
General Description
The MAX1953/MAX1954/MAX1957 is a family of versa-
tile, economical, synchronous current-mode, pulse-width
modulation (PWM) buck controllers. These step-down
controllers are targeted for applications where cost and
size are critical.
The MAX1953 operates at a fixed 1MHz switching fre-
quency, thus significantly reducing external component
size and cost. Additionally, excellent transient response
is obtained using less output capacitance. The MAX1953
operates from low 3V to 5.5V input voltage and can sup-
ply up to 10A of output current. Selectable current limit is
provided to tailor to the external MOSFETs’ on-resistance
for optimum cost and performance. The output voltage is
adjustable from 0.8V to 0.86V
IN
.
With the MAX1954, the drain-voltage range on the high-
side FET is 3V to 13.2V and is independent of the supply
voltage. It operates at a fixed 300kHz switching frequen-
cy and can be used to provide up to 25A of output cur-
rent with high efficiency. The output voltage is adjustable
from 0.8V to 0.86V
HSD
.
The MAX1957 features a tracking output voltage range of
0.4V to 0.86V
IN
and is capable of sourcing or sinking
current for applications such as DDR bus termination
and PowerPC™/ASIC/DSP core supplies. The MAX1957
operates from a 3V to 5.5V input voltage and at a fixed
300kHz switching frequency.
The MAX1953/MAX1954/MAX1957 provide a COMP pin
that can be pulled low to shut down the converter in
addition to providing compensation to the error amplifier.
An input undervoltage lockout (ULVO) is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFETs from overheating.
Internal digital soft-start is included to reduce inrush cur-
rent. The MAX1953/MAX1954/MAX1957 are available in
tiny 10-pin µMAX packages.
Low-Cost Current-Mode Controllers
Fixed-Frequency PWM
MAX1953
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current Limit
MAX1954
3V to 13.2V Input Voltage
25A Output Current Capability
93% Efficiency
300kHz Switching Frequency
MAX1957
Tracking 0.4V to 0.86V
IN
Output Voltage Range
Sinking and Sourcing Capability of 3A
Shutdown Feature
All N-Channel MOSFET Design for Low Cost
No Current-Sense Resistor Needed
Internal Digital Soft-Start
Thermal Overload Protection
Small 10-Pin µMAX Package
Features
MAX1953/MAX1954/MAX1957
Ordering Information
PART
MAX1953EUB
MAX1954EUB
MAX1957EUB
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
Pin Configurations
TOP VIEW
Applications
Printers and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Core Supply
Low-Voltage Distributed Power
Telecommunications and Networking
ILIM
1
COMP
FB
GND
IN
2
3
4
5
10
BST
9
LX
DH
PGND
DL
MAX1953EUB
8
7
6
µMAX
†Pg
PowerPC is a trademark of Motorola, Inc.
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.

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Is it lead-free? Contains lead - - Contains lead Contains lead Lead free
Is it Rohs certified? incompatible conform to - incompatible incompatible conform to
Parts packaging code TSSOP - - TSSOP TSSOP TSSOP
package instruction TSSOP, TSSOP10,.19,20 - - MO-187CBA, MICRO MAX PACKAGE-10 TSSOP, TSSOP10,.19,20 TSSOP, TSSOP10,.19,20
Contacts 10 - - 10 10 10
Reach Compliance Code not_compliant compliant - not_compliant not_compliant compliant
ECCN code EAR99 EAR99 - EAR99 EAR99 EAR99
Number of terminals 10 2 - 10 10 -
Minimum operating temperature -40 °C -55 °C - -40 °C -40 °C -
Package shape SQUARE TUBULAR PACKAGE - SQUARE SQUARE -
Package form SMALL OUTLINE, THIN PROFILE, SHRINK PITCH Axial - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH -
technology BICMOS WIRE WOUND - BICMOS BICMOS -
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