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MAX1928EUB25+

Description
voltage regulators - switching regulators 800ma pwm step-down DC/DC converter
CategoryPower/power management    The power supply circuit   
File Size300KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance
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MAX1928EUB25+ Overview

voltage regulators - switching regulators 800ma pwm step-down DC/DC converter

MAX1928EUB25+ Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerMaxim
Parts packaging codeSOIC
package instructionTSSOP,
Contacts10
Reach Compliance Codecompli
ECCN codeEAR99
Other featuresCAN ALSO OPERATE IN PFM MODE
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage2.6 V
Nominal input voltage3.6 V
JESD-30 codeS-PDSO-G10
JESD-609 codee3
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals10
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.8 A
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Package shapeSQUARE
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency1200 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTIN
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3 mm
Base Number Matches1
19-2527; Rev 0; 7/02
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
General Description
The MAX1927/MAX1928 800mA step-down converters
power low-voltage microprocessors in compact equip-
ment requiring the highest possible efficiency. The
MAX1927/MAX1928 are optimized for generating low
output voltages (down to 750mV) at high efficiency
using small external components. The supply voltage
range is from 2.6V to 5.5V and the guaranteed minimum
output current is 800mA. 1MHz pulse-width modulation
(PWM) switching allows for small external components.
A unique control scheme minimizes ripple at light loads,
while maintaining a low 140µA quiescent current.
The MAX1927/MAX1928 include a low on-resistance
internal MOSFET switch and synchronous rectifier to
maximize efficiency and minimize external component
count. No external diode is needed. 100% duty-cycle
operation allows for a dropout voltage of only 340mV at
800mA. Other features include internal soft-start,
power-OK (POK) output, and selectable forced PWM
operation for lower noise at all load currents.
The MAX1928 is available with several preset output
voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and
2.5V (MAX1928-25). The MAX1927R has adjustable
output range down to 0.75V. The MAX1927/MAX1928
are available in a tiny 10-pin µMAX package.
o
800mA Output Current
o
Output Voltages from 0.75V to 5V
o
2.6V to 5.5V Input Voltage Range
o
Power-OK Output
o
No Schottky Diode Required
o
Selectable Forced PWM Operation
o
1MHz Fixed-Frequency PWM Operation
o
140µA Quiescent Current
o
Soft-Start
o
10-Pin µMAX Package
Features
MAX1927/MAX1928
Ordering Information
PART
MAX1927REUB
PRESET
TEMP
PIN-
OUTPUT
PACKAGE
RANGE
VOLTAGE
Adj. to 0.75V -40°C to +85°C 10 µMAX
1.5V
1.8V
2.5V
-40°C to +85°C 10 µMAX
-40°C to +85°C 10 µMAX
-40°C to +85°C 10 µMAX
Applications
WCDMA Handsets
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
MAX1928EUB15
MAX1928EUB18
MAX1928EUB25
Pin Configuration
TOP VIEW
PWM
1
GND
REF
FB
COMP
2
3
4
5
10
POK
9
BATT
V
IN
2.6V TO 5.5V
Typical Operating Circuit
PWM
L1
LX
SHDN
R
C
COMP
C
C
C
f
FB
C2
V
OUT
0.75V AT 800mA
BATT
C1
MAX1927R
MAX1928
8
LX
7
PGND
6
SHDN
MAX1927R
POK
µMAX
REF
PGND
GND
________________________________________________________________
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.

MAX1928EUB25+ Related Products

MAX1928EUB25+ MAX1928EUB15+ MAX1928EUB25+T MAX1928EUB15+T MAX1928EUB18+T
Description voltage regulators - switching regulators 800ma pwm step-down DC/DC converter voltage regulators - switching regulators 800ma pwm step-down DC/DC converter voltage regulators - switching regulators 800ma pwm step-down DC/DC converter voltage regulators - switching regulators 800ma pwm step-down DC/DC converter voltage regulators - switching regulators 800ma pwm step-down DC/DC converter
Is it lead-free? Lead free Lead free Lead free Lead free Lead free
Is it Rohs certified? conform to conform to conform to conform to conform to
Parts packaging code SOIC SOIC SOIC SOIC SOIC
package instruction TSSOP, TSSOP, TSSOP10,.19,20 MICRO MAX PACKAGE-10 MICRO MAX PACKAGE-10 TSSOP, TSSOP10,.19,20
Contacts 10 10 10 10 10
Reach Compliance Code compli compli compli compli compli
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99
Other features CAN ALSO OPERATE IN PFM MODE CAN ALSO OPERATE IN PFM MODE CAN ALSO OPERATE IN PFM MODE CAN ALSO OPERATE IN PFM MODE CAN ALSO OPERATE IN PFM MODE
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 5.5 V 5.5 V 5.5 V 5.5 V 5.5 V
Minimum input voltage 2.6 V 2.6 V 2.6 V 2.6 V 2.6 V
Nominal input voltage 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V
JESD-30 code S-PDSO-G10 S-PDSO-G10 S-PDSO-G10 S-PDSO-G10 S-PDSO-G10
JESD-609 code e3 e3 e3 e3 e3
length 3 mm 3 mm 3 mm 3 mm 3 mm
Humidity sensitivity level 1 1 1 1 1
Number of functions 1 1 1 1 1
Number of terminals 10 10 10 10 10
Maximum operating temperature 85 °C 85 °C 85 °C 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C -40 °C -40 °C -40 °C
Maximum output current 0.8 A 0.8 A 0.8 A 0.8 A 0.8 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code TSSOP TSSOP TSSOP TSSOP TSSOP
Package shape SQUARE SQUARE SQUARE SQUARE SQUARE
Package form SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 260 260 260 260
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.1 mm 1.1 mm 1.1 mm 1.1 mm 1.1 mm
surface mount YES YES YES YES YES
Switch configuration BUCK BUCK BUCK BUCK BUCK
Maximum switching frequency 1200 kHz 1200 kHz 1200 kHz 1200 kHz 1200 kHz
technology BICMOS BICMOS BICMOS BICMOS BICMOS
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL
Terminal surface TIN Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 0.5 mm 0.5 mm 0.5 mm 0.5 mm 0.5 mm
Terminal location DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 30 NOT SPECIFIED 30 NOT SPECIFIED
width 3 mm 3 mm 3 mm 3 mm 3 mm
Base Number Matches 1 1 1 1 1
Encapsulate equivalent code - TSSOP10,.19,20 - TSSOP10,.19,20 TSSOP10,.19,20
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