MAX8860EUA33/T ,Low-Dropout, 300mA Linear Regulator in µMAXFeaturesThe MAX8860 low-noise, low-dropout linear regulator♦ High Output Current (300mA)operates fr ..
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MAX8860EUA33-T ,Low-Dropout, 300mA Linear Regulator in µMAXfeatures include a 10nA, logic-controlled shut-down mode, short-circuit and thermal-shutdown protec ..
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MB87001A ,CMOS PLL FREQUENCY SYNTHESIZERSept 1995
_ d9
__ FUJITSU
MB87001A
CMOS PLL FREQUENC Y SYNTHESlZER
CMOS SERIAL INPUT PHA ..
MAX8860EUA18+-MAX8860EUA18+T-MAX8860EUA25+-MAX8860EUA25+T-MAX8860EUA25-T-MAX8860EUA27+-MAX8860EUA28+-MAX8860EUA28+T-MAX8860EUA30+-MAX8860EUA33/T-MAX8860EUA33+T-MAX8860EUA33-T
Low-Dropout, 300mA Linear Regulator in µMAX
General DescriptionThe MAX8860 low-noise, low-dropout linear regulator
operates from a 2.5V to 6.5V input and is guaranteed to
deliver 300mA. Typical output noise for this device is
60µVRMS, and typical dropout is 105mV at 200mA. In
addition to the six available preset output voltages
(1.8V, 2.5V, 2.77V, 2.82V, 3V, and 3.3V), the Dual
Mode™ feature allows the device to be configured as
an adjustable output regulator from 1.25V to 6.5V.
Designed with an internal P-channel MOSFET pass tran-
sistor, the MAX8860 has a low 120µA supply current. An
output fault-detection circuit indicates loss of regulation.
Other features include a 10nA, logic-controlled shut-
down mode, short-circuit and thermal-shutdown protec-
tion, and reverse battery protection. The MAX8860 is
available in a miniature 8-pin µMAX package.
ApplicationsWireless Handsets
DSP Core Power
PCMCIA Cards
Hand-Held Instruments
Palmtop Computers
Electronic Planners
FeaturesHigh Output Current (300mA)Low Output Voltage Noise: 60µVRMSLow 105mV Dropout at 200mA OutputLow 120µA No-Load Supply CurrentThermal Overload and Short-Circuit ProtectionReverse Battery Protection10nA Logic-Controlled ShutdownFAULTIndicatorSmall, Space-Saving µMAX Package
(1.1mm max height)Small 2.2µF Output Capacitor
Saves Space and Cost
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAXFAULT
SHDN
SETOUT
GND
OUT
MAX8860
μMAX
TOP VIEW
MAX8860
OUT
OUT
SETFAULT
GND
SHDNC1
2.2μF
C2
2.2μF
C3
33nF
OUTPUT
UP TO
300mA
INPUT
+2.5V TO
+6.5V
FAULT-
DETECT
OUTPUT
100kΩ
Typical Operating Circuit19-1422; Rev 2; 1/01
MAX8860EUA18
MAX8860EUA28-40°C to +85°C
-40°C to +85°C8 µMAX
8 µMAX
Pin Configuration
Ordering InformationDual Mode is a trademark of Maxim Integrated Products.
MAX8860EUA33-40°C to +85°C8 µMAX
PARTTEMP RANGEPIN-
PACKAGE+1.80
+2.82
+3.30
VOUT
(V)+2.77MAX8860EUA27-40°C to +85°C8 µMAX
+2.50MAX8860EUA25-40°C to +85°C8 µMAX
MAX8860EUA30-40°C to +85°C+3.008 µMAX
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 3.6V, CCC= 33nF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (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, SHDNto GND .......................................................-7V to +7V
SHDNto IN...............................................................-7V to +0.3V
SET, CC, FAULTto GND..........................................-0.3V to +7V
OUT to GND ..............................................-0.3V to (VIN+ 0.3V)
FAULTSink Current ...........................................................20mA
Continuous Output Current ..............................................330mA
Output Short-Circuit Duration ....................................Continuous
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C)............330mW
Thermal Resistance (θJA)
8-Pin µMAX ............................................................+244°C/W
Operating Temperature Range
MAX8860EUA_ _ ...........................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................+300°C
IOUT= 100µA to 300mA
VIN= 2.5V to 6.5V, SET = OUT, IOUT= 1mA
IOUT= 300mA
IOUT= 200mA
IOUT= 1mA
DC average current rating
VOUT= 0, SHDN= GND
SET = GND
CONDITIONS%/mA0.0006Load Regulation0.0001
%/V-0.10.010.1Line Regulation
Dropout Voltage (Note 4)105220
0.60.05Shutdown Supply Current0.011165Supply Current120270
3.243.33.352.56.5Input Voltage (Note 2)330770Output Current Limit300Maximum Output Current
UNITSMINTYPMAXPARAMETER1.256.5Adjustable Output Voltage
Range (Note 3)= +25°CMAX8860EUA33TA= -40°C to +85°C3.213.38= +25°CMAX8860EUA30TA= -40°C to +85°C2.923.08
2.953.003.05= +25°CMAX8860EUA28TA= -40°C to +85°C2.752.90
IOUT= 0
IOUT= 300mA= +25°C= +85°C
SET = OUT
SET = GND
SET Threshold VoltageVSET = OUT, VIN= 2.5V to 6.5V,
IOUT= 1mA1.2201.275= +25°C= -40°C to +85°C
100µA < IOUT
< 300mA,
VIN= VOUT1V,
SET = GND= +25°CMAX8860EUA25= +25°CMAX8860EUA27TA= -40°C to +85°C= -40°C to +85°C
2.462.502.54= +25°COutput Voltage
MAX8860EUA18TA= -40°C to +85°C1.7551.845
1.771.801.83
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAX
ELECTRICAL CHARACTERISTICS (continued)(VIN= 3.6V, CCC= 33nF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1:Specifications to -40°C are guaranteed by design and not production tested.
Note 2:Guaranteed by line-regulation test.
Note 3:Adjustable mode only.
Note 4:The dropout voltage is defined as VIN- VOUTwhen VOUTis 100mV below the value of VOUTfor VIN= VOUT2V. Since the
minimum input voltage is 2.5V, this is applicable only for voltages of 2.5V or higher.
Note 5:The FAULTdetection voltage is the difference from input to output voltage. Maintain the input above this level to ensure
good line and load regulation.
COUT= 10µF, VOUTto 90% of final value
VIN= 2.5V, ISINK= 2mA
SHDN= GND or IN
VSET= 1.3V
CONDITIONS120Start-Up Time20Thermal Shutdown Hysteresis170Thermal Shutdown Temperature0.01100
0.011000.25FAULTOutput Low Voltage0.5SHDNInput Bias Current
0.012.5nA0.5SET Input Leakage Current (Note 3)
UNITSMINTYPMAXPARAMETER= +25°C= +85°C= +25°C= +85°C
SET = GND, IOUT= 200mAmV130280FAULTDetection Voltage (Note 5)
Typical Operating Characteristics(VIN= VOUT+ 0.5V, CIN= COUT= 2.2µF, CCC= 33nF, TA= +25°C, unless otherwise noted.)
NORMALIZED OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8860 toc01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (%)15020050100250300
VOUT NORMALIZED AT IOUT = 0
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8860 toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (%)
IOUT = 0
IOUT = 100mA
IOUT = 200mA
VOUT NORMALIZED AT +25°C, IOUT = 0
SUPPLY CURRENT vs. LOAD CURRENT
MAX8860 toc03
LOAD CURRENT (mA)
SUPPLY CURRENT (
TA = +85°C
TA = +25°C
TA = -40°C
VFAULT= 3.6V0.5FAULTOutput Off-Leakage CurrentTA= +25°C= +85°C
VIL, 2.5V ≤VIN≤5.5V
VIH, 2.5V ≤VIN≤5.5V0.42.0SHDNInput Threshold
COUT = 2.2µF
COUT = 10µFIOUT= 10mA,
10Hz < f < 100kHz
COUT = 100µF
10Hz < f < 100kHz, COUT = 10µF
µVRMS
Output Voltage Noise
nV√HzOutput Voltage Noise Density
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAXypical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= COUT= 2.2µF, CCC= 33nF, TA= +25°C, unless otherwise noted.)
NO LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8860 toc04
INPUT VOLTAGE (V)
SUPPLY CURRENT (
TA = +85°C
TA = +25°C
TA = -40°C
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8860 toc05
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = +85°C
TA = +25°C
TA = -40°C
FAULT DETECT THRESHOLD
vs. LOAD CURRENT
MAX8860 toc06
LOAD CURRENT (mA)
FAULT DETECT THRESHOLD (mV)
FAULT = HIGH
FAULT = LOW
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8860 toc07
FREQUENCY (kHz)
PSRR (dB)
200mA
ILOAD
LOAD-TRANSIENT RESPONSEMAX8860 toc10
400μs/div
VOUT
20mV/div
VIN = VOUT + 200mV
OUTPUT NOISE SPECTRAL DENSITY
MAX8860 toc08
FREQUENCY (kHz)
NOISE (
Hz)
COUT = 2.2μF
COUT = 10μF
ILOAD = 10mA
VOUT
500μV/div
OUTPUT NOISE
(10Hz TO 1MHz)MAX8860 toc09
1ms/div
ILOAD = 200mA
+4.3V
LINE-TRANSIENT RESPONSEMAX8860 toc12
500μs/div
VOUT
2mV/div
VIN
+3.3V
ILOAD = 200mA
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAXypical Operating Characteristics (continued)(VIN= VOUT+ 0.5V, CIN= COUT= 2.2µF, CCC= 33nF, TA= +25°C, unless otherwise noted.)
NAMEFUNCTION1, 4OUTRegulator Output. Bypass with 2.2µF, low-ESR capacitor to GND for stable operation.
PIN
Pin Description
POWER-UP RESPONSEMAX8860 toc13
5ms/div
FAULT
VOUT
VIN
POWER-DOWN RESPONSEMAX8860 toc14
2ms/div
VOUT
VIN
FAULT4V
SHUTDOWN/POWER-UPMAX8860 toc15
400μs/div
VOUT
SHDNINSupply Input. Connect to power source (2.5V to 6.5V). Bypass with 2.2µF capacitor to GND.GNDGroundSETOutput Voltage Set. Connect to GND for internally set threshold. Connect to resistor-divider for adjustable
output voltages. Seethe Output VoltageSelectionsection for more information.CCCompensation Capacitor. Connect a 0.033µF capacitor from CC to GND.SHDNShutdown Input. Connect to IN for normal operation. Drive SHDNlow to turn off the regulator.FAULTFault Output. A high-impedance, open-drain output. When the MAX8860 is out of regulation, FAULTgoes
low. In shutdown, the FAULTpin is high impedance. Connect to GND if unused.
Detailed DescriptionThe MAX8860 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. It supplies an adjustable 1.25V to
6.5V output voltage or a fixed-voltage output of 1.8V
(MAX8860EUA18), 2.5V (MAX8860EUA25), 2.77V
(MAX8860EUA27), 2.82V (MAX8860EUA28), 3.0V
(MAX8860EUA30), or 3.3V (MAX8860EUA33) for load
currents up to 300mA. The devices with 2.77V and
2.82V nominal outputs are designed to guarantee mini-
mum output voltages of 2.70V and 2.75V, respectively.
The device consists of a 1.25V reference, error amplifi-
er, MOSFET driver, P-channel pass transistor, Dual
Mode comparator, fault detector, and internal-feedback
voltage divider (Figure 1).
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference to the selected feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the P-
channel pass transistor. If the feedback voltage is lower
than the reference voltage, the pass-transistor gate is
pulled lower, allowing more current to pass and
increasing the output voltage. If the feedback voltage
is higher than the reference voltage, the pass-transistor
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 connected to
OUT, or an external resistor network connected to SET.
The Dual Mode comparator examines VSETand selects
the feedback path. If VSETis below 60mV, internal
feedback is used and the output voltage is regulated to
the preset output voltage. Additional blocks include an
output current limiter, reverse battery protection, a ther-
mal sensor, a fault detector, and shutdown logic.
MAX8860
Low-Dropout, 300mA
Linear Regulator in µMAX
Internal P-Channel Pass TransistorThe MAX8860 features a 0.5Ωtypical P-channel
MOSFET pass transistor. This provides several advan-
tages over similar designs using PNP pass transistors,
including longer battery life. PNP-based regulators
waste considerable amounts of current in dropout when
the pass transistor saturates. They also use high base-
drive currents under large loads. The P-channel
MOSFET requires no base-drive current, which reduces
quiescent current considerably. The MAX8860 con-
sumes less than 165µA of quiescent current whether in
dropout, light-load, or heavy-load applications (see the
Typical Operating Characteristics).
Output Voltage SelectionThe MAX8860 features Dual Mode operation: it operates
in either a preset voltage mode or an adjustable mode.
In preset voltage mode, internal, trimmed feedback
resistors set the output voltage to an adjustable 1.25V to
6.5V output voltage or a fixed-voltage output of 1.8V
(MAX8860EUA18), 2.5V (MAX8860EUA25), 2.77V
(MAX8860EUA27), 2.82V (MAX8860EUA28), 3V
(MAX8860EUA30), or 3.3V (MAX8860EUA33). Select
this mode by connecting SET to ground. In adjustable
mode, select an output between 1.25V and 6.5V using
two external resistors connected as a voltage divider to
SET (Figure 2). Calculate the output voltage with the fol-
lowing equation:
where VSET= 1.25V. To simplify resistor selection, use
the following equation:R2 V 1 OUT
SETROUTSET =+11
SHUTDOWN
LOGIC
ERROR
AMP
1.25V
REF
OUT
SET
FAULT
DUAL-MODE
COMPARATOR60mV
GND
SHDN
MAX8860
THERMAL
SENSOR
FAULT
DETECT
REVERSE
BATTERY
PROTECTION
MOS DRIVER
WITH ILIMIT
Figure 1. Functional Diagram
Figure 2. Adjustable Output Using External Feedback
Resistors
MAX8860
OUT
SET
FAULT
GND
SHDN
COUT
2.2μF
CIN
2.2μF
33nF
BATTERY
OUTPUT
VOLTAGE
100kΩ
