MAX1927REUB ,Low-Output-Voltage / 800mA / PWM Step-Down DC-DC ConvertersFeaturesThe MAX1927/MAX1928 800mA step-down converters 800mA Output Currentpower low-voltage micro ..
MAX1927REUB ,Low-Output-Voltage / 800mA / PWM Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS (continued)(V = 3.6V, SHDN = BATT, C = 0.1µF, T = 0°C to +85°C, unless o ..
MAX1927REUB ,Low-Output-Voltage / 800mA / PWM Step-Down DC-DC ConvertersApplicationsMAX1928EUB18 1.8V -40°C to +85°C 10 µMAXWCDMA HandsetsMAX1928EUB25 2.5V -40°C to +85°C ..
MAX1927REUB+ ,Low-Output-Voltage, 800mA, PWM Step-Down DC-DC ConvertersApplicationsMAX1928EUB18 1.8V -40°C to +85°C 10 µMAXWCDMA HandsetsMAX1928EUB25 2.5V -40°C to +85°C ..
MAX1927REUB+T ,Low-Output-Voltage, 800mA, PWM Step-Down DC-DC ConvertersFeaturesThe MAX1927/MAX1928 800mA step-down converters♦ 800mA Output Currentpower low-voltage micro ..
MAX1927REUB-T ,Low-Output-Voltage, 800mA, PWM Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V = 3.6V, SHDN = BATT, C = 0.1µF, T = 0°C to +85°C, unless otherwise not ..
MAX488EPA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplications:EMI and reduce reflections caused by improperly termi-MAX3460–MAX3464: +5V, Fail-Safe, ..
MAX488ESA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX148719-0122; Rev 5; 2/96Low-Power, Slew-Rate-LimitedRS-485/RS ..
MAX488ESA+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX488ESA+T ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsMAX481EESA -40°C to +85°C 8 SOIndustrial-Control Local Area Networks MAX483ECPA 0°C to ..
MAX488MJA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversGeneral Description ________
MAX488MJA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversFeaturesThe MAX481, MAX483, MAX485, MAX487–MAX491, and' In µMAX Package: Smallest 8-Pin SOMAX1487 a ..
MAX1927REUB-MAX1928EUB15
Low-Output-Voltage / 800mA / PWM Step-Down DC-DC Converters
General DescriptionThe 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.
ApplicationsWCDMA Handsets
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
Features800mA Output CurrentOutput Voltages from 0.75V to 5V2.6V to 5.5V Input Voltage RangePower-OK OutputNo Schottky Diode RequiredSelectable Forced PWM Operation1MHz Fixed-Frequency PWM Operation140µA Quiescent CurrentSoft-Start10-Pin µMAX Package
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
Ordering Information
Typical Operating Circuit19-2527; Rev 0; 7/02
Pin Configuration
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VBATT= 3.6V, SHDN= BATT, CREF= 0.1µF, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
BATT, PWM, POK, COMP, SHDNto GND...............-0.3V to +6V
PGND to GND.......................................................-0.3V to +0.3V
LX, REF, FB to GND................................-0.3V to (VBATT+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
Typical Operating Characteristics(Circuits of Figure 3 and 4, TA = +25°C, unless otherwise noted.)
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
Typical Operating Characteristics (continued)(Circuits of Figure 3 and 4, TA = +25°C, unless otherwise noted.)
