Linear Regulator. MAX8940 Datasheet

MAX8940 Regulator. Datasheet pdf. Equivalent

Part MAX8940
Description 120mA Linear Regulator
Feature 19-4662; Rev 0; 6/09 www.DataSheet4U.com Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulator.
Manufacture Maxim Integrated Products
Datasheet
Download MAX8940 Datasheet




MAX8940
19-4662; Rev 0; 6/09
www.DataSheet4U.com
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
General Description
The MAX8940 low-noise, low-dropout (LDO) linear reg-
ulator is designed to deliver up to 120mA continuous
output current. This regulator achieves a low 120mV
dropout for 120mA load current. The MAX8940 uses an
advanced architecture to achieve low output voltage
noise of 25µVRMS and PSRR of 45dB at 100kHz.
The MAX8940 is preset to either 2.8V or 3.0V. Designed
with a p-channel MOSFET series pass transistor, the
MAX8940 maintain very low ground current (40µA).
The regulator is designed and optimized to work with low-
value, low-cost ceramic capacitors. The MAX8940
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
Package is a 5-pin SC70.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Features
Space-Saving SC70
25µVRMS Output Noise at 100Hz to 100kHz
Bandwidth
65dB PSRR at 10kHz
120mV Dropout at 120mA Load
Stable with 1µF Ceramic Capacitor for Any Load
Guaranteed 120mA Output
Output Voltages: 2.8V or 3V
Low 40µA Ground Current
Excellent Load/Line Transient
Overcurrent and Thermal Protection
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX8940EXKxy-T
-40°C to +85°C 5 SC70
MAX8940EXKxy+T
-40°C to +85°C 5 SC70
*xy is the output voltage code (see Output Voltage Selector
Guide).
+Denotes a lead(Pb)-free/RoHS-compliant package.
Output Voltage Selector Guide
PART
MAX8940EXK28-T
MAX8940EXK30-T
VOUT (V)
2.8
3
TOP MARK
AUE
AUD
Pin Configuration
TOP VIEW
IN 1
5 OUT
GND 2 MAX8940
SHDN 3
4 BP
SC70
Typical Operating Circuit
INPUT
2V TO 6V
CIN = 1µF
ON
OFF
PRESET OUTPUT
2.8V OR 3.0V
IN OUT
MAX8940
SHDN
GND
BP CBP = 10nF
COUT = 1µF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.



MAX8940
www.DataSheet4U.com
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +7V
Output Short-Circuit Duration ............................................Infinite
OUT, SHDN to GND ......................................-0.3V to (IN + 0.3V)
FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (TA = +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............0.247W
θJA
5-Pin SC70 ................................................................324°C/W
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
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.
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C;
the MAX8940 is tested with 2.45V output, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage Range
Output Voltage Accuracy
Maximum Output Current
Current Limit
Dropout Voltage (Note 2)
Ground Current
Line Regulation
Load Regulation
Shutdown Supply Current
Ripple Rejection
SYMBOL
VIN
IOUT
ILIM
IQ
VLNR
VLDR
ISHDN
PSRR
CONDITIONS
IOUT = 1mA, TA = +25°C
IOUT = 100µA to 80mA, TA = +25°C
IOUT = 100µA to 80mA
OUT = 90% of nominal value
VOUT = 3V, IOUT = 80mA
VOUT = 3V, IOUT = 120mA
VOUT = 2.8V, IOUT = 80mA
VOUT = 2.8V, IOUT = 120mA
IOUT = 0.05mA
VIN = VOUT (nom) - 0.1V, IOUT = 0mA
VIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA
IOUT = 1mA to 80mA
SHDN = 0V
TA = +25°C
TA = +85°C
f = 10kHz, IOUT = 10mA
f = 100kHz, IOUT = 10mA
MIN TYP MAX UNITS
2.8 6 V
-1 +1
-2 +2 %
-3 +3
120 mA
130 200 300 mA
80 170
120
mV
90 200
135
40 90
µA
220 500
0.001
%/V
0.003
%/mA
0.003
0.05
1
µA
65
dB
45
2 _______________________________________________________________________________________







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