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MB87001A ,CMOS PLL FREQUENCY SYNTHESIZERSept 1995
_ d9
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MB87001A
CMOS PLL FREQUENC Y SYNTHESlZER
CMOS SERIAL INPUT PHA ..
MAX8860EUA25-MAX8860EUA27-MAX8860EUA28-MAX8860EUA30-MAX8860EUA33
Low-Dropout / 300mA Linear Regulator in MAX
General DescriptionThe MAX8860 low-noise, low-dropout linear regulator
operates from a +2.5V to +6.5V input and is guaran-
teed 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, +3.0V, 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 µMAX
Typical Operating Circuit19-1422; Rev 1; 12/99
Pin Configuration
Ordering InformationDual Mode is a trademark of Maxim Integrated Products.
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 +7VSHDNto 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
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= VOUT+2V. 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.
Typical Operating Characteristics(VIN= VOUT+ 0.5V, CIN= COUT= 2.2µF, CCC= 33nF, TA= +25°C, unless otherwise noted.)
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.)
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.)
Pin Description
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
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),
+3.V (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 following equation:
where VSET= 1.25V. To simplify resistor selection, use
the following equation:
Figure 1. Functional Diagram
