MAX1725EUK+-MAX1725EUK+T-MAX1726EUK18-MAX1726EUK18+T-MAX1726EUK25+-MAX1726EUK33+-MAX1726EUK33+T-MAX1726EUK50+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1726EUK33+T ,12V, Ultra-Low-IQ, Low-Dropout Linear RegulatorsFeaturesThe MAX1725/MAX1726 are ultra-low supply current,♦ 2µA Supply Currentlow-dropout linear reg ..
MAX1726EUK50+T ,12V, Ultra-Low-IQ, Low-Dropout Linear RegulatorsApplicationsMAX1725EUK+T -40°C to +85°C 5 SOT23 ADNKMAX1726EUK18+T -40°C to +85°C 5 SOT23 ADNLSmoke ..
MAX1729EUB ,ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature CompensationELECTRICAL CHARACTERISTICS(V = +3V, CTLIN = IN, FB = GND, T = -40°C to +85°C, unless otherwise note ..
MAX172ACNG ,Complete 10s CMOS 12-Bit ADCGeneral Description The MAX172 is a complete 12-Bit analog-to-digital converter (ADC) that comb ..
MAX172ACNG+ ,Complete 10µs CMOS 12-Bit ADCapplications, can be used with a crystal. The MAX172 uses a standard microprocessor interface ..
MAX172ACWG ,Complete 10s CMOS 12-Bit ADCapplications, can be used with a crystal. The MAX172 uses a standard microprocessor interface ..
MAX4558EEE ,15kV ESD-Protected / Low-Voltage / CMOS Analog Multiplexers/SwitchesFeaturesThe MAX4558/MAX4559/MAX4560 are low-voltage,' ESD-Protected X, Y, Z and X_, Y_, Z_ PinsCMOS ..
MAX4558ESE ,15kV ESD-Protected / Low-Voltage / CMOS Analog Multiplexers/SwitchesMAX4558/MAX4559/MAX456019-1443; Rev 0; 4/99±15kV ESD-Protected, Low-Voltage, CMOSAnalog Multiplexer ..
MAX4558ESE+ ,±15kV ESD-Protected, Low-Voltage, CMOS Analog Multiplexers SwitchesELECTRICAL CHARACTERISTICS—Dual ±5V Supplies(V = +4.5V to +5.5V, V = -4.5V to -5.5V, V = +2.4V, V = ..
MAX4559CEE ,15kV ESD-Protected / Low-Voltage / CMOS Analog Multiplexers/SwitchesELECTRICAL CHARACTERISTICS—Dual ±5V Supplies(V = +4.5V to +5.5V, V = -4.5V to -5.5V, V = +2.4V, V = ..
MAX4559CPE+ ,±15kV ESD-Protected, Low-Voltage, CMOS Analog Multiplexers SwitchesFeaturesThe MAX4558/MAX4559/MAX4560 are low-voltage,♦ ESD-Protected X, Y, Z and X_, Y_, Z_ PinsCMOS ..
MAX4559CSE ,15kV ESD-Protected / Low-Voltage / CMOS Analog Multiplexers/SwitchesApplications' Low Crosstalk: < -93dB (50Ω)Battery-Operated Equipment' High Off-Isolation: < -96dB ( ..

MAX1725EUK+-MAX1725EUK+T-MAX1726EUK18-MAX1726EUK18+T-MAX1726EUK25+-MAX1726EUK33+-MAX1726EUK33+T-MAX1726EUK50+T
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
General Description
The MAX1725/MAX1726 are ultra-low supply current,
low-dropout linear regulators intended for low-power
applications that demand the longest possible battery
life. Unlike inferior PNP-based designs, the MAX1725/
MAX1726s’ PMOS pass elements maintain an ultra-low
2µA supply current throughout their entire operating
range and in dropout. Despite their ultra-low power
consumption, the MAX1725/MAX1726 have tight output
accuracy (1.5%) and require just 1µF output capacitance
to achieve good load-transient response.
These regulators have a wide input voltage range
(+2.5V to +12V), making them excellent choices for
systems powered from two lithium-ion (Li+) cells and 9V
batteries. Other features include reverse-battery protec-
tion, short-circuit protection, and thermal protection.
The MAX1725 provides an adjustable 1.5V to 5V output
using an external resistor-divider. The MAX1726 pro-
vides factory preset 1.8V, 2.5V, 3.3V, or 5V output volt-
ages (see the Ordering Information). Both devices are
available in a tiny 5-pin SOT23 package.
________________________Applications
Smoke Detectors
Remote Transmitters
Smart Battery Packs
Industrial Control Systems
Microcontroller Power
Real-Time Clock Backup Power
PDAs and Handy-Terminals
Battery-Powered Alarms
Features2µA Supply CurrentReverse-Battery Protection+2.5V to +12V Input Voltage RangeFixed 1.8V, 2.5V, 3.3V, and 5V Output Voltages
(MAX1726)Adjustable 1.5V to 5V Output Voltages (MAX1725)20mA Guaranteed Output Current1.5% Output Voltage AccuracySmall 1µF Output CapacitorShort-Circuit ProtectionThermal Protection Tiny 5-Pin SOT23 Package
VIN
2.5V TO 12V
OUTPUT
1.5V TO 5V
MAX1726
OFFOUT
SHDNGND
PARTOUTPUT VOLTAGE
(V)
MAX1725EUK+TAdj 1.5 to 5.0
MAX1726EUK18+TFixed 1.8
MAX1726EUK25+TFixed 2.5
MAX1726EUK25/V+TFixed 2.5
MAX1726EUK33+TFixed 3.3
MAX1726EUK50+TFixed 5.0
Typical Operating Circuit
Ordering Information
Selector Guide
Pin Configuration appears at end of data sheet.
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX1725EUK+T-40°C to +85°C5 SOT23ADNK
MAX1726EUK18+T-40°C to +85°C5 SOT23ADNL
MAX1726EUK25+T-40°C to +85°C5 SOT23ADNM
MAX1726EUK25/V+T-40°C to +85°C5 SOT23AFMN
MAX1726EUK33+T-40°C to +85°C5 SOT23ADNN
MAX1726EUK50+T-40°C to +85°C5 SOT23ADNO
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive-qualified part.
Note:See the Selector Guide for the output options as they relate
to the part number suffix.
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN= VOUT+ 1V, SHDN= IN, IOUT= 1mA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 2)
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 to GND................................................................-14V to +14V
SHDNto GND..............................................-0.3V to (VIN+ 0.3V)
(-0.3V to + 0.3V when VIN< 0V)
OUT, FB (MAX1725 only) to GND...................-0.3V to +6V when
VIN>5.7V; -0.3V to (VIN+ 0.3V) when 0V <
VIN< 5.7V; -0.3V to +0.3Vwhen VIN< 0V
OUT Continuous Current...................................................200mA
OUT Short Circuit...........................................................Indefinite
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
VSHDN= 0V, VIN= 12V, VOUT= 0V
VIN= 12V
(Note 3)
VIN= -12V, VSHDN= 0V
VIN= 2.5V to 12V
VIN= 12V, VOUT= 0V
VFB= 1.25V
IOUT= 20mA for VOUT≥2.5V, IOUT= 10mA for
VOUT< 2.5V, not applicable for VOUT< 1.9V
VIN= (VOUT+ 1V) or 3V (Note 5)
MAX1725 only
VIN= 2.5V or (VOUT+ 0.5V) to 12V
IOUT= 1mA to 20mA, VIN= (VOUT+ 1V)
or 3V (min)
VSHDN= 0V to 12V
CONDITIONS15Thermal-Shutdown Hysteresis0.0110INReverse Leakage Current
1.5nA-202+20IFBFB Input Bias Current
(MAX1725 only)
0.1nA-50+50ISHDNSHDNInput Bias Current0.72IIN(SHDN)Shutdown Supply Current24.5IIN2.512VINInput Voltage Range
Supply Current 2VIH40ISCFoldback Current Limit300600∆VDODropout Voltage (Note 5)2080IOUTMaximum OUT Current 1.55VOUTOUT Voltage Range
OUT Voltage Accuracy (Note 4)
%/V0.010.3∆VLNRLine Regulation
%/mA0.0150.15∆VLDRLoad Regulation
UNITSMINTYPMAXSYMBOLPARAMETER= +25°C= +85°C= +25°C= +85°C
MAX1725 only (Note 4)V1.245VFBFB Voltage +2+3= +25°C= 0°C to +85°C= -40°C to +85°C
0.5VILSHDNInput Threshold
Temperature rising°C150Thermal-Shutdown Threshold
Note 1:Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
Junction-to-Ambient Thermal Resistance (θJA)...............140°C/W
7589101112SUPPLY CURRENT vs. INPUT VOLTAGE
MAX1725/26 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT vs. LOAD CURRENT
MAX1725/26 toc02
LOAD CURRENT (mA)
SUPPLY CURRENT (
VIN = 5V
SUPPLY CURRENT vs. TEMPERATURE
MAX1725/26 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (
VIN = 5V
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX1725/26 toc04
OUTPUT VOLTAGE (%DEVIATION)
ILOAD = 20mA
ILOAD = 1mA
NOMINAL OUTPUT = 3.3V
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1725/26 toc05
OUTPUT VOLTAGE (% DEVIATION)42620
NOMINAL OUTPUT = 3.3V
VIN = 4.5V
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX1725/26 toc06
NORMALIZED OUTPUT VOLTAGE (%)-0.20
IOUT = 1mA
Typical Operating Characteristics
(VOUT= +3.3V, IOUT= 1mA, TA= +25°C, unless otherwise noted.)
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN= VOUT+ 1V, SHDN= IN, IOUT= 1mA, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 2)
Note 2:Limits are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 3:Guaranteed by OUT line-regulation testing.
Note 4:OUT accuracy from nominal voltage. The MAX1725 is tested at VOUT= 1.5V, 2.5V, and 5V.
Note 5:When VOUTfalls to 4% below its value at VIN= VOUT+ 1V.
IOUTfrom 1mA to 10mA, tR= tF= 1µs
∆VIN= ±0.25V, tR= tF= 5µs
f = 10Hz to 100kHz
CONDITIONS200OUT Load-Transient
Overshoot/Undershoot15OUT Line-Transient
Overshoot/Undershoot
µVRMS350enOUT Noise
UNITSMINTYPMAXSYMBOLPARAMETER
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
Detailed Description
The MAX1725/MAX1726 are low-dropout, low-quiescent-
current linear regulators designed primarily for battery-
powered applications (Figure 1). The MAX1725 provides
an adjustable output voltage from 1.5V to 5V using an
external resistor-divider. The MAX1726 supplies preset
output voltages of 1.8V, 2.5V, 3.3V, or 5V. These devices
consist of a +1.245V error amplifier, MOSFET driver,
and p-channel pass transistor (Figure 2).
Typical Operating Characteristics (continued)
(VOUT= +3.3V, IOUT= 1mA, TA= +25°C, unless otherwise noted.)
NAME
MAX1725MAX17261IN2GND3OUT4GND—FB
Pin Description
FUNCTION
Supply Voltage Input
Ground
Voltage Output
Ground
Feedback Voltage Input
PIN
IOUT
20mA/div
VOUT
100mV/div
400μs/div
LOAD TRANSIENT
MAX1725/26 toc10
COUT = 1μF
IOUT = 1mA - 20mA
VSHDN
2V/div
VOUT
1V/div
4ms
TURN-ON/TURN-OFF RESPONSE
MAX1725/26 toc11
COUT = 1μF
IOUT = 1mA
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX1725/26 toc07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = +85°C
TA = +25°C
TA = -40°C
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX1725/26 toc08
FREQUENCY (kHz)
PSRR (dB)
VIN = 5V
VOUT = 3.3V
RL = 3.3kΩ
COUT = 1μF
VIN
200mV/div
VOUT
20mV/div
100μs/div
LINE-TRANSIENT RESPONSE
MAX1725/26 toc09
COUT = 1μF
IOUT = 1mA
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
The error amplifier compares 1.245V to the selected
feedback voltage and amplifies the difference. If the
feedback voltage is lower than 1.245V, the pass-tran-
sistor gate is pulled lower, allowing more current to
pass, and thus increasing the output voltage. If the
feedback voltage is higher than 1.245V, the pass-tran-
sistor gate is driven higher, allowing less current to
pass to the output. The output voltage is fed back
through either an internal resistor voltage-divider con-
nected to OUT (MAX1726) or an external resistor net-
work connected to FB (MAX1725). Additional features
include an output currentlimiter, reverse-battery protec-
tion, a thermal sensor, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX1725/MAX1726 feature a p-channel MOSFET
pass transistor. This provides advantages over similar
designs using PNP pass transistors, including longer
battery life. The p-channel MOSFET requires no base
drive, which reduces quiescent current considerably.
PNP-based regulators waste considerable current in
dropout when the pass transistor saturates; they also
use high base-drive currents under large loads. The
MAX1725/MAX1726 do not suffer from these prob-
lems, and consume only 2µA of quiescent current
throughout their load range (see the Typical Operating
Characteristics).
INPUT
2.5V TO 12V
OUTPUT
1.5V TO 5V
MAX1725
OFFOUTSHDNGND
1.2MΩ
COUT
1µF
CIN
1µFOUT
FB (MAX1725 ONLY)
(MAX1726 ONLY)
SHDN
BIAS
CIRCUITRY
THERMAL
SHUTDOWN
GND
1.245V
MAX1725
MAX1726
Figure 1. Typical Application Circuit
Figure 2. Functional Diagram
MAX1725/MAX1726
12V, Ultra-Low IQ, Low-Dropout
Linear Regulators
Shutdown
To enter shutdown, drive the SHDNpin below 0.5V.
When the MAX1725/MAX1726 are shut down, the output
pass transistor shuts off, the output falls to ground, and
supplycurrent drops from 2µA to 0.7µA. Connect SHDN
to IN for normal operation. If reverse-battery protection
is needed,drive SHDNthrough a 100kΩresistor.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX1725/MAX1726. When the junction tem-
perature exceeds TJ= +150°C, the thermal sensor
signals the shutdown logic, turning off the pass transistor
and allowing the IC to cool. The thermal sensor turns
the pass transistor on again after the IC’s junction tem-
perature cools by 15°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
devices in the event of fault conditions. For continuous
operation, do not exceed the absolute maximum junction
temperature rating of TJ= +150°C.
Foldback Current Limiting
The MAX1725/MAX1726 also include a foldback current
limiter. When the output is shorted to ground, the output
PMOS drive is limited so that the output current does
not exceed 40mA (typ). The output can be shorted to
ground indefinitely without damaging the part.
Reverse-Battery Protection
The MAX1725/MAX1726 have a unique protection
scheme that limits the reverse supply current to less
than 10µA when VINis forced below ground. The cir-
cuitry monitors the polarity of the input, disconnecting
the internal circuitry and parasitic diodes when the battery
is reversed. This feature prevents the device, battery,
and load from overheating and electrical stress. For
reverse-battery protection, drive SHDNthrough a
100kΩresistor.
Applications Information
Capacitor Selection and
Regulator Stability
For general purposes, use a 1µF capacitor on the
MAX1725/MAX1726 input and output. Larger input
capacitor values and lower ESR provide better supply-
noise rejection and transient response. A higher-value
input capacitor (10µF) may be necessary if large, fast
transients are anticipated and the device is located sev-
eral inches from the power source. For stable operation
over the full temperature range, use a minimum of 1µF
on the output.
Output-Voltage Selection
For fixed 1.8V, 2.5V, 3.3V, or 5V output voltages, use
the MAX1726.
The MAX1725 features an adjustable output voltage
from 1.5V to 5V, using two external resistors connected
as a voltage-divider to FB (Figure 1). The MAX1725 is
optimized for operation with R2 = 1.2MΩ. The output
voltage is set by the following equation:
where typically VFB= 1.245V. To simplify resistor selec-
tion:
Choose R2 = 1.2MΩfor best accuracy.
Power-Supply Rejection and Operation
from Sources Other than Batteries
The MAX1725/MAX1726 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 60dB at low
frequencies and rolls off above 100Hz. At high frequen-
cies, the output capacitor is the major contributor to the
rejection of power-supply noise (see the Power-Supply
Rejection Ratio vs. Frequency graph in the Typical
Operating Characteristics).
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the value of the input and output capaci-
tors, and by using passive filtering techniques (see the
Supply and Load Transient Response graph in the
Typical Operating Characteristics).ROUTFB=+⎛⎜⎞⎟ 11V
OUT1 =⎛⎜⎞⎟−

Partno	Mfg	Dc	Qty	Available	Descript
MAX1725EUK+	MAXIM	N/a	2500	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1725EUK+T	MAX	N/a	1006	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK18	MAXIM	N/a	476	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK18+T	MAXIM	N/a	1887	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK25+	N/A	N/a	2500	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK33+ \|MAX1726EUK33	MAXI	N/a	702	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK33+T	Maxim / Dallas	N/a	4700	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators
MAX1726EUK50+T	MAXIC	N/a	2500	avai	12V, Ultra-Low-IQ, Low-Dropout Linear Regulators