MAX1857EUA47+T Fast Delivery |IC PHOENIX CO.,LIMITED

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 ..
MAX1858EEG ,Dual 180 Out-of-Phase PWM Step-Down Controller with Power Sequencing and PORApplicationsPin ConfigurationNetwork Power Supplies TOP VIEWTelecom Power SuppliesCOMP2 1 24 ENDSP, ..
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 ..
MAX4766CETA+ ,0.075A to 1.5A, Programmable Current-Limit SwitchApplicationsSDIO PortsNotebook ComputersINOUTPDAs and Palmtop DevicesONCell PhonesμP MAX4766FLAG*SE ..

MAX1857EUA47+T
500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX
General Description
The 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.
________________________Applications
Notebook 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
SET
GNDSHDN
OUT
OUTIN
RST
μMAX
TOP VIEW
MAX1857
Pin Configuration
MAX1857
OFF
CIN
1μF
SHDN
OUT
OUT
RST
GNDSET
COUT
3.3μF
TO
VIN = +5V VOUT = 4.75V
RRST
100kypical Operating Circuit
19-1812; Rev 0; 1/01
Ordering Information
PART*TEMP. RANGEPIN-PACKAGE
MAX1857EUA47-40°C to +85°C8 μMAX
*Contact factory for other preset output voltages.
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, 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.
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input VoltageVIN2.55.5V
Input Undervoltage LockoutVUVLORising, 75mV hysteresis2.02.152.3V
VOUT ≥ 2.5V-1+1IOUT = 100mA,
TA = +85°CVOUT < 2.5V-1.5+1.5%
IOUT = 100mA, TA = 0°C to +85°C-2+2Output Voltage Accuracy
(Preset Mode)VOUT
IOUT = 1mA to 500mA, VIN > VOUT + 0.5V,
TA = 0°C to +85°C-3+3%
Adjustable Output Voltage
RangeVSET = 1.25V1.255V
TA = +85°C1.2291.2501.271SET Voltage Threshold
(Adjustable Mode)VSET
VIN = +2.7V,
VOUT set to 2.0V,
IOUT = 100mATA = 0°C to +85°C1.2191.281
Maximum Output CurrentIOUTVIN ≥ 2.7V500mARMS
Short-Circuit Current LimitILIMVOUT = 0, VIN ≥ 2.7V0.551.22.2A
In-Regulation Current LimitVOUT > 96% of nominal value, VIN ≥ 2.7V2.0A
SET Dual Mode™ Threshold50100150mV
SET Input Bias CurrentISETVSET = 1.25V-100+100nA
IOUT = 1mA135250Ground-Pin CurrentIQIOUT = 500mA175μA
Dropout Voltage (Note 1)VIN -
VOUTIOUT = 500mA120175mV
Line RegulationΔVLNRVIN from (VOUT + 100mV) to 5.5V,
ILOAD = 5mA-0.150+0.15%/V
Load RegulationΔVLDRIOUT = 1mA to 500mA0.41.0%
Output Voltage Noise10Hz to 1MHz, COUT = 3.3μF (ESR < 0.1Ω)115μVRMS
SHUTDOWN
Shutdown Supply CurrentIOFFSHDN = GND, VIN = 5.5V0.115μA
VIH2.5V < VIN < 5.5V1.6SHDN Input ThresholdVIL2.5V < VIN < 5.5V0.6V
SHDN Input Bias CurrentSHDN = IN or GND10100nA
Dual Mode is a trademark of Maxim Integrated Products.
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ELECTRICAL CHARACTERISTICS
(VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
ELECTRICAL CHARACTERISTICS (continued)
((VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RESET OUTPUT
Reset Output Low VoltageVOLRST sinking 1mA0.010.1V
Operating Voltage Range for
Valid ResetRST sinking 100μA1.05.5V
RST Output High Leakage
CurrentV RST = +5.5V100nA
RST ThresholdRising edge, referred to VOUT(NOMINAL)838689%
RST Release DelaytRPRising edge of OUT to rising edge of RST1.44.58ms
THERMAL PROTECTION
Ther m al S hutd ow n Tem p er atur eTSHDN170°C
Thermal Shutdown HysteresisΔTSHDN20°C
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Input VoltageVIN2.55.5V
Input Undervoltage LockoutVUVLORising or falling2.02.3V
Output Voltage Accuracy
(Preset Mode)VOUTIOUT = 1mA to 500mA-3+3%
Adjustable Output Voltage
RangeVSET = 1.25V1.255V
SET Voltage Threshold
(Adjustable Mode)VSETIOUT = 100mA1.2121.288V
Maximum Output CurrentIOUT500mARMS
Short-Circuit Current LimitILIMVOUT = 00.552.2A
SET Dual Mode Threshold50150mV
SET Input Bias CurrentISETVSET = 1.25V-100+100nA
Ground-Pin CurrentIQIOUT = 1mA250µA
Dropout Voltage (Note 1)VIN -
VOUTIOUT = 500mA175mV
Line RegulationΔVLNRVIN from (VOUT + 100mV) to 5.5V,
ILOAD = 5mA-0.15+0.15%/V
Load RegulationΔVLDRIOUT = 1mA to 500mA1.0%
SHUTDOWN
Shutdown Supply CurrentIOFFSHDN = GND, VIN = +5.5V15µA
VIH2.5V < VIN < 5.5V1.6SHDN Input
ThresholdVIL2.5V < VIN < 5.5V0.6V
SHDN Input Bias CurrentSHDN = IN or GND100nA
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1857 toc01
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
VIN = 5.25V
VIN = 5.00V
OUTPUT VOLTAGE vs. TEMPERATURE
MAX1857 toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
IOUT = 0mA
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
MAX1857 toc03
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = +25°C
TA = -40°C
TA = +85°C
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
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
RESET OUTPUT
Reset Output Low VoltageVOLRST sinking 1mA0.1V
Operating Voltage Range for
Valid ResetRST sinking 100μA1.05.5V
RST Output High Leakage
CurrentV RST = +5.5V100nA
RST ThresholdRising edge, referred to VOUT(NOMINAL)8389%
RST Release DelaytRPRising edge of OUT to rising edge of RST1.48ms
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +5.25V, VOUT = 4.75V, SHDN= IN, SET = GND, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1:Dropout voltage is defined as VIN- VOUT, when VOUTis 100mV below the value of VOUTmeasured when VIN = VOUT(NOM)
+ 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
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX1857 toc04
FREQUENCY (kHz)
PSRR (dB)
COUT = 3.3μF
IOUT = 50mA
LOAD-TRANSIENT RESPONSE
MAX1857 toc05
10μs/div
4.80V
600mA
4.75V
4.70V
400mA
200mA
A: VOUT = 4.75V, 50mV/div
B: IOUT = 5mA TO 500mA, 200mA/div
VIN = 5.25V, CIN = 10μF
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1857 toc06
10μs/div
4.80V
4.75V
4.70V
4.65V
400mA
200mA
A: VOUT = 4.75V, 50mV/div
B: IOUT = 5mA TO 500mA, 200mA/div
VIN = VOUT + 100mV = 4.85V, CIN = 10μF
SWITCHING POWER-SUPPLY
RIPPLE REJECTION
MAX1857 toc07
2μs/div
5.0V
4.75V
A: MAX1632: VIN = 9V, VOUT = 5.0V, 20mV/div
B: MAX1857: VOUT = 4.75V, IOUT = 500mA, 2mV/div
OUTMAX1632 = INMAX1857
RST WAVEFORM
MAX1857 toc09
20ms/div
A: VIN = 0 TO 5.5V, 2V/div
B: VOUT = 4.75V, ROUT = 95Ω, 2V/div
C: VRST, 100kΩ TO OUT, 2V/div
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.)
SHUTDOWN WAVEFORM
MAX1857 toc08
40μs/div
A: VSHDN = 0 TO 2V, 1V/div
B: VOUT = 4.75V, 2V/div
ROUT = 9.5Ω (500mA)
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
MAX1857
Pin Description
PINNAMEFUNCTION
1, 2INRegulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with a 1µF capacitor or greater to
GND (see Capacitor Selection and Regulator Stability). Connect both input pins together externally.RST
Open-Drain, Active-Low Reset Output. RST remains low while the output voltage (VOUT) is below the reset
threshold and for at least 4ms after VOUT rises above the reset threshold. Connect a 100kΩ pullup resistor
to OUT.SHDNActive-Low Shutdown Input. A logic low reduces supply current to 0.1µA. In shutdown, the RST output is
low and OUT is pulled low through an internal 5kΩ resistor. Connect to IN for normal operation.GNDGroundSETVoltage-Setting Input. Connect to GND for preset output. Connect a resistive voltage-divider from OUT to
set the output voltage between 1.25V and 5.0V.
7, 8OUTRegulator Output. Sources up to 500mA. Bypass with a 3.3µF low-ESR capacitor to GND. Use a 4.7µF
capacitor for output voltages below 2V. Connect both output pins together.
100mV
SHDN
RST
OFF

CIN
1μF
VIN = +2.5V TO +5.5V
OUT
OUT
VOUT = 1.25V TO 5.0V
COUT
3.3μF
THERMAL
SENSOR
SET
MOSFET
DRIVER WITH
ILIM
DELAY
TIMER
SHUTDOWN
LOGIC VREF
1.25V
ERROR
AMPLIFIER
GND
RRST
100kΩ
LOGIC SUPPLY
VOLTAGE (VOUT)
86% VREF
5kΩ
MAX1857
Figure 1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1857EUA47+T	MAXIM	N/a	2500	avai	500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX
MAX1857EUA47+T \|MAX1857EUA47T	MAX	N/a	2500	avai	500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX