MAX1857EUA47 ,500mA / Low-Dropout / Ripple-Rejecting LDO in MAXELECTRICAL CHARACTERISTICS(V = +5.25V, V = 4.75V, SHDN = IN, SET = GND, T = 0°C to +85°C, unless ot ..
MAX1857EUA47+T ,500mA, Low-Dropout, Ripple-Rejecting LDO in µMAXApplications Ordering InformationNotebook ComputersPART* TEMP. RANGE PIN-PACKAGECellular and Cordle ..
MAX1857EUA47+T ,500mA, Low-Dropout, Ripple-Rejecting LDO in µMAXELECTRICAL CHARACTERISTICS(V = +5.25V, V = 4.75V, SHDN = IN, SET = GND, T = 0°C to +85°C, unless ot ..
MAX1858A ,Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and PORApplicationsMAX1858AREF 6 19 VLNetwork Power Supplies MAX1875AGND 7 18 PGNDMAX1876ATelecom Power Su ..
MAX1858AEEG ,Dual 180 Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and PORApplicationsMAX1858AREF 6 19 VLNetwork Power Supplies MAX1875AGND 7 18 PGNDMAX1876ATelecom Power Su ..
MAX1858AEEG+ ,Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and PORFeaturesThe MAX1858A/MAX1875A/MAX1876A dual, synchro-♦ 4.5V to 23V Input Supply Rangenized, step-do ..
MAX4764ETB+T ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityApplications♦ Available in µMAX, TDFN, Thin QFN, and UCSPPackagesCell PhonesPDAs and Handheld Devic ..
MAX4764ETB+T ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityFeaturesThe MAX4762–MAX4764/MAX4764A/MAX4765 dual♦ Distortion-Free Negative Signal Throughput DownS ..
MAX4764EUB ,Low-Voltage / Dual SPDT / Audio Clickless Switches with Negative Rail CapabilityApplications♦ 0.01% Total Harmonic DistortionCell Phones♦ Available in µMAX, TDFN, Thin QFN, and UC ..
MAX4764EUB+ ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityMAX4762–MAX4764/MAX4764A/MAX476519-3152; Rev 2; 1/06Low-Voltage, Dual SPDT, Audio ClicklessSwitches ..
MAX4765EBC+T ,Low-Voltage, Dual SPDT, Audio Clickless Switches with Negative Rail CapabilityMAX4762–MAX4764/MAX4764A/MAX476519-3152; Rev 2; 1/06Low-Voltage, Dual SPDT, Audio ClicklessSwitches ..
MAX4766CETA ,0.075A to 1.5A, Programmable Current-Limit SwitchApplicationsSDIO PortsNotebook ComputersINOUTPDAs and Palmtop DevicesONCell PhonesµP MAX4766FLAG*SE ..
MAX1857EUA47
500mA / Low-Dropout / Ripple-Rejecting LDO in MAX
General DescriptionThe MAX1857 low-dropout linear regulator operates
from a +2.5V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 120mV dropout. The
high-accuracy (±1%) output voltage is preset at an
internally trimmed 4.75V or can be adjusted from 1.25V
to 5.0V with an external resistive divider.
An internal PMOS pass transistor allows the low 135µA
supply current to remain independent of load, making
this device ideal for portable battery-operated equip-
ment such as personal digital assistants (PDAs), cellu-
lar phones, cordless phones, base stations, and
notebook computers.
Other features include an active-low open-drain reset
output with a 4.5ms timeout period that indicates when
the output is out of regulation, a 0.1µA shutdown mode,
short-circuit protection, and thermal shutdown protec-
tion. The device is available in a miniature 8-pin µMAX
package. For higher power applications, refer to the
MAX1792 and MAX1793 data sheets.
________________________ApplicationsNotebook Computers
Cellular and Cordless Telephones
PDAs
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
FeaturesGuaranteed 500mA Output CurrentLow 120mV Dropout at 500mAUp to ±1% Output Voltage Accuracy
Preset at 4.75V
Adjustable from 1.25V to 5.0VReset Output with 4.5ms Timeout Period Low 135µA Ground Current0.1µA Shutdown CurrentThermal Overload ProtectionOutput Current LimitTiny µMAX Package
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
Pin Configurationypical Operating Circuit19-1812; Rev 0; 1/01
*Contact factory for other preset output voltages.
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
IN, SHDN, RST, SET to GND....................................-0.3V to +6V
OUT to GND................................................-0.3V to (VIN+ 0.3V)
Output Short-Circuit Duration........................................Indefinite
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
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
Dual Mode is a trademark of Maxim Integrated Products.
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics(VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, CIN= 1µF, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ELECTRICAL CHARACTERISTICS (continued)+ 0.5V. Since the minimum input voltage is 2.5V, this specification is only meaningful when VOUT(NOM)≥2.5V. For VOUT(NOM)
between 2.5V and 3.5V, use the following equations: Typical Dropout = -93mV/V ✕VOUT(NOM) + 445mV; Guaranteed Maximum
Dropout = -137mV/V ✕VOUT(NOM) + 704mV. For VOUT(NOM) ≥3.5V: Typical Dropout = 120mV; Guaranteed Maximum Dropout
= 175mV.
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
Typical Operating Characteristics (continued)(VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, CIN= 1µF, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
MAX1857Figure 1. Functional Diagram
