MAX8511EXK18+T ,Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear RegulatorsMAX8510/MAX8511/MAX851219-2732; Rev 0; 1/03Ultra-Low-Noise, High PSRR, Low-Dropout,120mA Linear Reg ..
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MB81C81A-35 ,CMOS 256K-BIT HIGH-SPEED SRAMMay 1990 00
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M38 1 C8 1A-25/-35
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MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMFUJITSU SEMICONDUCTORADVANCED INFO. AE0.1EDATA SHEETMEMORYCMOS4 · 512 K · 32 BITSYNCHRONOUS DYNAMIC ..
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MAX8510ETA25+T-MAX8510ETA28+-MAX8510EXK15+T-MAX8510EXK18+T-MAX8510EXK18+TG65-MAX8510EXK21+T-MAX8510EXK25-MAX8510EXK25+T-MAX8510EXK27+T-MAX8510EXK28+T-MAX8510EXK29-MAX8510EXK29+T-MAX8510EXK30-MAX8510EXK30/T-MAX8510EXK30+T-MAX8510EXK30-T-MAX8510EXK33+T-MAX8510EXK33-T-MAX8510EX
Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators
General DescriptionThe MAX8510/MAX8511/MAX8512 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver up
to 120mA continuous output current from a tiny 5-pin
SC70 plastic package. These regulators achieve a low
120mV dropout for 120mA load current. The MAX8510
uses an advanced architecture to achieve ultra-low output
voltage noise of 11µVRMSand PSRR of 54dB at 100kHz.
The MAX8511 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8512’s output voltage can be adjusted with an
external divider.
The MAX8510/MAX8511 are preset to a variety of volt-
ages in the 1.5V to 4.5V range. Designed with a P-
channel MOSFET series pass transistor, the MAX8510/
MAX8511/MAX8512 maintain very low ground current
(40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8510
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
ApplicationsCellular 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
FeaturesSpace-Saving 5-Pin SC70 Package11µVRMSOutput Noise at 100Hz to 100kHz
Bandwidth (MAX8510)78dB PSRR at 1kHz (MAX8510)120mV Dropout at 120mA LoadStable with 1µF Ceramic Capacitor for Any Load Guaranteed 120mA OutputOnly Need Input and Output Capacitors (MAX8511)Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8510/MAX8511) and
Adjustable (MAX8512)Low 40µA Ground CurrentExcellent Load/Line TransientOvercurrent and Thermal Protection
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR,
Low-Dropout,120mA Linear Regulators in SC70
Pin Configuration
Ordering Information
Typical Operating Circuits*xy is the output voltage code (see Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
Output Voltage Selector Guide appears at end of data sheet.
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70
ABSOLUTE MAXIMUM RATINGS
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 MAX8512 is tested with 2.45V output, unless otherwise noted.) (Note 1)
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.................................................................-0.3V to +7V
Output Short-Circuit Duration............................................Infinite
OUT, SHDNto 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
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70
ELECTRICAL CHARACTERISTICS (continued)(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;
Note 1:Limits are 100% tested at +25°C. Limits over operating temperature range are guaranteed by design.
Note 2:Dropout is defined as VIN- VOUTwhen VOUTis 100mV below the value of VOUTfor VIN = VOUT + 0.5V.
Note 3:Time needed for VOUTto reach 90% of final value.
Typical Operating Characteristics(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70ypical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70ypical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8510/MAX8511/MAX8512
Ultra-Low-Noise, High PSRR, Low-Dropout,
120mA Linear Regulators in SC70
Detailed DescriptionThe MAX8510/MAX8511/MAX8512 are ultra-low-noise,
low-dropout, low-quiescent current linear regulators
designed for space-restricted applications. The parts
are available with preset output voltages ranging from
1.5V to 4.5V in 100mV increments. These devices can
supply loads up to 120mA. As shown in the Functional
Diagram, the MAX8510/MAX8511 consist of an innova-
tive bandgap core and noise bypass circuit, error
amplifier, P-channel pass transistor, and internal feed-
back voltage-divider. The MAX8512 allows for
adjustable output with an external feedback network.
The 1.225V bandgap reference is connected to the
error amplifier’s inverting input. The error amplifier com-
pares this reference with the feedback voltage and
amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled low. This allows more current to pass to
the output and increases theoutput voltage. If the feed-
back voltage is too high, the pass transistor gate is
pulled high, allowing less current to pass to the output.
The output voltage is fed back through an internal resis-
tor voltage-divider connected to the OUT pin.
An external bypass capacitor connected to BP
(MAX8510) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
Internal P-Channel Pass TransistorThe MAX8510/MAX8511/MAX8512 feature a 1Ω(typ) P-
channel MOSFET pass transistor. This provides several
advantages over similar designs using a PNP pass
transistor, including longer battery life. The P-channel
MOSFET requires no base drive, which considerably
reduces quiescent current. PNP-based regulators
waste considerable current in dropout when the pass
transistor saturates. They also use high base-drive cur-
rent under heavy loads. The MAX8510/MAX8511/
MAX8512 do not suffer from these problems and con-
sume only 40µA of quiescent current in light load and
220µA in dropout (see the Typical Operating
Characteristics).
Output Voltage SelectionThe MAX8510/MAX8511 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see Ordering Information). The MAX8512 features a
user-adjustable output through an external feedback
network (see the Typical Operating Circuits).
To set the output of the MAX8512, use the following
equation:
where R2 is chosen to be less than 240kΩand VREF=
1.225V. Use 1% or better resistors.
ShutdownThe MAX8510/MAX8511/MAX8512 feature a low-power
shutdown mode that reduces quiescent current less
than 1µA. Driving SHDNlow disables the voltage refer-
ence, error amplifier, gate-drive circuitry, and pass
transistor (see the Functional Diagram), and the device
output enters a high-impedance state. Connect SHDN
to IN for normal operation.
Current LimitThe MAX8510/MAX8511/MAX8512 include a current
limiter, which monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 200mA.
