MAX8840ELT45+TG65 ,Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFNELECTRICAL CHARACTERISTICS(V = V + 0.5V, T = -40°C to +85°C, unless otherwise noted. C = 1µF, C = 1 ..
MAX8842ELT+T ,Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFNFeaturesThe MAX8840/MAX8841/MAX8842 ultra-low-noise, low- ♦ Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN ..
MAX8845XETC+ ,28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected OutputFeaturesThe MAX8845Z/MAX8845Y/MAX8845X/MAX8845W are♦ CCCV, Thermally Regulated Linear 1-Cell Li+int ..
MAX8845YETC+ ,28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected OutputELECTRICAL CHARACTERISTICS(V = 5V, V = 4V, R = 1MΩ to BATT, EN = unconnected, R = 2.8kΩ to GND, V = ..
MAX884CPA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulatorsfeatures a 7µA standby mode that disablesStandby Modethe output but keeps the reference, low-batter ..
MAX884CSA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear RegulatorsMAX882/MAX883/MAX88419-0275; Rev 0; 12/945V/3.3V or Adjustable, Low-Dropout, Low I , 200mA Linear R ..
MB86604L ,SCSI-II Protocol Controller (with single-ended driver/receiver)FUJITSU SEMICONDUCTORDS04-22415-1EDATA SHEETASSP Communication ControlCMOSSCSI-II Protocol Contr ..
MB86604LPFV ,SCSI-II Protocol Controller (with single-ended driver/receiver)FUJITSU SEMICONDUCTORDS04-22415-1EDATA SHEETASSP Communication ControlCMOSSCSI-II Protocol Contr ..
MB86606A ,FAST-20 SCSI Protocol ControllerFEATURESSCSI Protocol Controller Block:• Operable as initiator and target• WIDE and FAST-20 data tr ..
MB86626 , KeyWave AFE ADSL Analog Front End
MB86831 ,Microprocessor SPARClite CMOSapplications. Conforming to the SPARC * architecture, the MB86830 series is upward code-compatible ..
MB86831 ,Microprocessor SPARClite CMOSfeatures of the MB86830 series achieves high levels of speed, flexibility, and efficiency, making i ..
MAX8840ELT27+-MAX8840ELT30+-MAX8840ELT30+T-MAX8840ELT33+-MAX8840ELT45+TG65-MAX8842ELT+T
Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN
MAX8840/MAX8841/
MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
General DescriptionThe MAX8840/MAX8841/MAX8842 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regula-
tors achieve a low 120mV dropout for 120mA load cur-
rent. The MAX8840 uses an advanced architecture to
achieve ultra-low output voltage noise of 11µVRMSand
PSRR of 54dB at 100kHz.
The MAX8841 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8842 output voltage can be adjusted with an exter-
nal divider.
The MAX8840/MAX8841 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 MAX8840/MAX8841/
MAX8842maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8840
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
The MAX8840/MAX8841/MAX8842 are available in a tiny
1.0mm x 1.5mm x 0.8mm µDFN.
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 1.0mm x 1.5mm x 0.8mm µDFN11µVRMSOutput Noise at 100Hz to 100kHz
Bandwidth (MAX8840)78dB PSRR at 1kHz (MAX8840)120mV Dropout at 120mA LoadStable with 1µF Ceramic Capacitor for Any Load Guaranteed 150mA OutputOnly Need Input and Output Capacitors (MAX8841)Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and
Adjustable (MAX8842)Low 40µA Ground CurrentExcellent Load/Line TransientOvercurrent and Thermal ProtectionµDFN
(1.5mm x 1.0mm)TOP VIEW
GND
BP (MAX8840)
N.C. (MAX8841)
FB (MAX8842)
SHDN
OUTN.C.
MAX8840
MAX8841
MAX8842
Pin Configuration
Ordering InformationMAX8840
OUTPUT PRESET
1.5V TO 4.5VIN
INPUT
2V TO 6V
OFFSHDN
CBP
10nF
COUT
1µF
CIN
1µF
OUT
GND
Typical Operating Circuits*xy is the output voltage code (see the Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
+Denotes lead-free package.
PART*TEMP RANGEPIN-PACKAGE
MAX8840ELTxy+T-40°C to +85°C6 µDFN-6
1.5mm x 1.0mm
MAX8841ELTxy+T-40°C to +85°C6 µDFN-6
1.5mm x 1.0mm
MAX8842ELT+T-40°C to +85°C6 µDFN-6
1.5mm x 1.0mm
Typical Operating Circuits continued at end of data sheet.
Output Voltage Selector Guide appears at end of data sheet.
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
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 MAX8842 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)
6-Pin µDFN (derate 2.1mW/°C above +70°C).............0.168W
θJA..................................................................................477°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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSInput Voltage RangeVIN26V
IOUT = 1mA, TA = +25°C-1+1
IOUT = 100µA to 80mA, TA = +25°C-2+2Output Voltage Accuracy
IOUT = 100µA to 80mA-3+3
Maximum Output CurrentIOUT150mA
Current LimitILIMOUT = 90% of nominal value150200300mA
VOUT ≥ 3V, IOUT = 80mA80170
VOUT ≥ 3V, IOUT = 120mA120
2.5V ≤ VOUT < 3V, IOUT = 80mA90200
2.5V ≤ VOUT < 3V, IOUT = 120mA135
2V ≤ VOUT < 2.5V, IOUT = 80mA120250
Dropout Voltage (Note 2)
2V ≤ VOUT < 2.5V, IOUT = 120mA180
IOUT = 0.05mA4090Ground CurrentIQVIN = VOUT(nom) - 0.1V, IOUT = 0mA220500µA
Line RegulationVLNRVIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA0.001%/V
Load RegulationVLDRIOUT = 1mA to 80mA0.003%/mA
TA = +25°C0.0031Shutdown Supply CurrentISHDNSHDN = 0VTA = +85°C0.05µA
MAX884078f = 1kHz, IOUT = 10mAMAX8841/MAX884272
MAX884075f = 10kHz, IOUT = 10mAMAX8841/MAX884265
MAX884054
Ripple RejectionPSRR
f = 100kHz, IOUT = 10mAMAX8841/ MAX884246
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
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;
the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1)
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.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX884011f = 100Hz to 100kHz,
ILOAD = 10mAMAX8841/MAX8842230
MAX884013
Output Noise Voltage
(RMS)f = 100Hz to 100kHz,
ILOAD = 80mAMAX8841/MAX8842230
Shutdown Exit DelayRLOAD = 50Ω (Note 3)300µs
SHDN Logic-Low LevelVIN = 2V to 6V0.4V
SHDN Logic-High LevelVIN = 2V to 6V1.5V
TA = +25°CSHDN Input Bias CurrentVIN = 6V, SHDN = 0V orTA = +85°C0.01µA
TA = +25°C0.0060.1FB Input Bias Current
(MAX8842)VIN = 6V, VFB = 1.3VTA = +85°C0.01µA
Thermal Shutdown160°C
Thermal-Shutdown
Hysteresis10°C
Typical Operating Characteristics(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8840
OUTPUT VOLTAGE vs. INPUT VOLTAGEMAX8840 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)4321
IOUT = 150mA
IOUT = 0mA
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENTMAX8840 toc02
LOAD CURRENT (mA)
% DEVIATION (%)
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8840 toc03
TEMPERATURE (°C)
% DEVIATION (%)3510-15
IOUT = 1mA
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Typical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8440
DROPOUT VOLTAGE vs. LOAD CURRENTMAX8840 toc04
INPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
TA = +85°C
TA = +25°C
TA = -40°C
MAX8840
DROPOUT VOLTAGE vs. OUTPUT VOLTAGEMAX8840 toc05
OUTPUT (V)
DROPOUT VOLTAGE (mV)
IOUT = 80mA
MAX8840
GROUND PIN CURRENT vs. INPUT VOLTAGEMAX8840 toc06
INPUT VOLTAGE (V)
GROUND PIN CURRENT (321
ILOAD = 150mA
ILOAD = 0mA
MAX8840
GROUND PIN CURRENT vs. LOAD CURRENTMAX8840 toc 07
LOAD CURRENT (mA)
GROUND PIN CURRENT (
VIN = 3.8V
VIN = 5.5V
MAX8840
GROUND PIN CURRENT vs. TEMPERATUREMAX8840 toc08
TEMPERATURE (°C)
GROUND PIN CURRENT (3510-15
MAX8840
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8840 toc09
FREQUENCY (kHz)
PSRR (dB)101000.1
ILOAD = 10mA
CBP = 10nF
MAX8841
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX8840 toc10
PSRR (dB)
ILOAD = 10mA
MAX8840
OUTPUT NOISEMAX8840 toc11
400μs/div
VIN = 3.8V
ILOAD = 10mA
VNOISE = 11μVRMS
20μV/div
MAX8840
OUTPUT NOISE-SPECTRAL DENSITY
vs. FREQUENCYMAX8840 toc12
OUTPUT NOISE DENSITY (nV/
10,000
0.011000
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Typical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= 1µF, COUT= 1µF, CBP= 10nF, TA= +25°C, unless otherwise noted.)
MAX8840
OUTPUT NOISE vs. BP CAPACITANCEMAX8840 toc13
BP CAPACITANCE (nF)
OUTPUT NOISE (
MAX8840
LOAD-TRANSIENT RESPONSE
MAX8840 toc14
1ms/div
VIN = 3.5V
ILOAD = 0 TO 50mA
VOUT
10mV/div
MAX8840
LOAD-TRANSIENT RESPONSE NEAR DROPOUTMAX8840 toc15
1ms/div
VIN = 3.1V
ILOAD = 0 TO 50mA
VOUT
10mV/div
MAX8840
LINE-TRANSIENT RESPONSE MAX8840 toc16
200μs/div
VIN = 3.5V TO 4V
VOUT
2mV/div
MAX8840
EXITING SHUTDOWN WAVEFORMMAX8840 toc17
20μs/div
VOUT = 2.85V
RLOAD = 47Ω
OUTPUT
VOLTAGE
2V/div
SHUTDOWN
VOLTAGE
MAX8840
ENTERING SHUTDOWN DELAYMAX8840 toc18
40μs/div
CBP = 0.01μF
OUTPUT
VOLTAGE
2V/div
SHUTDOWN
VOLTAGE
MAX8840
SHUTDOWN EXIT DELAYMAX8840 toc19
20μs/div
SHUTDOWN
VOLTAGE
VOUT
1V/div
VOUT = 3V
CBP = 100nF
MAX8840
REGION OF STABLE COUT ESR
vs. LOAD CURRENTMAX8840 toc20
LOAD CURRENT (mA)
OUT
ESR (
0.01150125
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
Detailed DescriptionThe MAX8840/MAX8841/MAX8842 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. These devices can supply loads up to
150mA. As shown in the Functional Diagram, the
MAX8840/MAX8841 consist of an innovative bandgap
core and noise bypass circuit, error amplifier, p-chan-
nel pass transistor, and internal feedback voltage-
divider. The MAX8842 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
(MAX8840) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
Internal p-Channel Pass TransistorThe MAX8840/MAX8841/MAX8842feature a 1Ω(typ)
p-channel MOSFET pass transistor. This provides seve-
ral 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 transis-
tor saturates. They also use high base-drive current
under heavy loads. The MAX8840/MAX8841/MAX8842
do not suffer from these problems and consume only
40µA of quiescent current in light load and 220µA in
dropout (see the Typical Operating Characteristics).
Output Voltage SelectionThe MAX8840/MAX8841 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see the Ordering Information). The MAX8842 features
a user-adjustable output through an external feedback
network (see the Typical Operating Circuits).
To set the output of the MAX8842, use the following
equation:
where R2 is chosen to be less than 240kΩand VREF=
1.225V. Use 1% or better resistors.
ShutdownThe MAX8840/MAX8841/MAX8842 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 MAX8840/MAX8841/MAX8842 include a current
limiter, which monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 200mA.XV
OUT
REF121=⎛⎜⎞⎟-
Pin Description
PIN
MAX8840MAX8841MAX8842NAMEFUNCTION11INUnregulated Input Supply22GNDGround
333SHDNShutdown. Pull low to disable the regulator.—BPNoise Bypass for Low-Noise Operation. Connect a 10nF capacitor
from BP to OUT. It is shorted to OUT in shutdown mode.—4FBAdjustable Output Feedback Point4, 55N.C.No Connection. Not internally connected.
666OUTRegulated Output Voltage. Bypass with a capacitor to GND. See the
Capacitor Selection and Regulator Stability section.
