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Low-Dropout, 300mA Linear Regulators in SOT23
General DescriptionThe MAX8887/MAX8888 low-dropout linear regulators
operate from a 2.5V to 5.5V input and deliver up to
300mA continuous (500mA pulsed) current. The
MAX8887 is optimized for low-noise operation, while the
MAX8888 includes an open-drain POK ouput flag. Both
regulators feature exceptionally low 100mV dropout at
200mA. These devices are available in a variety of pre-
set output voltages in the 1.5V to 3.3V range.
An internal PMOS pass transistor allows the low 55µA
supply current to remain independent of load, making
these devices ideal for portable battery-powered equip-
ment such as personal digital assistants (PDAs), cellu-
lar phones, cordless phones, and notebook computers.
Other features include a micropower shutdown mode,
short-circuit protection, thermal shutdown protection,
and an active-low open-drain power-OK (POK) output
that indicates when the output is out of regulation. The
MAX8887/MAX8888 are available in a thin 5-pin SOT23
package that is only 1mm high.
________________________ApplicationsNotebook Computers
Wireless Handsets
PDAs and Palmtop Computers
Digital Cameras
PCMCIA Cards
Hand-Held Instruments
FeaturesGuaranteed 300mA Output Current (500mA for
Pulsed Loads)Low 100mV Dropout at 200mA Load POK Output (MAX8888)42µVRMSOutput Noise (MAX8887)Preset Output Voltages (1.5V, 1.8V, 2.85V, and
3.3V)55µA No-Load Supply CurrentThermal Overload and Short-Circuit ProtectionFoldback Output Current-Limit Protection60dB PSRR at 1kHz0.1µA Shutdown CurrentThin 5-Pin SOT23 Package, 1mm HighMAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
Pin Configurations
Typical Operating Circuit19-1859; Rev 2; 6/04
Ordering Information*Other versions (xy) between +1.5 and +3.3V are available in
100mV increments. Contact factory for other versions. Minimum
order quantity is 25,000 units.
MAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VOUT+ 1V, SHDN= IN, TA = -40°C to +85°C, 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, SHDN, POK, to GND...........................................-0.3V to +7V
OUT, BP to GND............................................-0.3 to (VIN+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
Operating Temperature Ranges..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+500°C
MAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
ELECTRICAL CHARACTERISTICS (continued)(VIN= VOUT+ 1V, SHDN= IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1:All parts are 100% tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:Typical and maximum dropout voltage for different output voltages are shown in the Typical Operating Characteristics
curve.
ypical Operating Characteristics(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
Typical Operating Characteristics (continued)(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
LOAD-TRANSIENT RESPONSE
NEAR DROPOUTMAX8887/8 toc12
50mV/div
AC-COUPLED
300mA
10mA
VOUT
IOUT
10µs/div
ypical Operating Characteristics (continued)(Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
Detailed DescriptionThe MAX8887/MAX8888 are low-dropout, low-quies-
cent-current linear regulators designed primarily for
battery-powered applications. The devices supply
loads up to 300mA and are available in several fixed
output voltages in the 1.5V to 3.3V range. The
MAX8887 is optimized for low-noise operation, while
the MAX8888 includes an open-drain POK output flag.
As illustrated in Figure 1, the MAX8888 consists of a
1.25V reference, error amplifier, P-channel pass tran-
sistor, and internal feedback voltage divider.
Internal P-Channel Pass TransistorThe MAX8887/MAX8888 feature a 0.5ΩP-channel
MOSFET pass transistor. Unlike similar designs using
PNP pass transistors, P-channel MOSFETs require no
base drive, which reduces quiescent current. PNP-
based regulators also waste considerable current in
dropout when the pass transistor saturates and use
high base drive currents under large loads. The
MAX8887/MAX8888 do not suffer from these problems
and consume only 55µA of quiescent current under
heavy loads as well as in dropout.
Output Voltage SelectionThe MAX8887/MAX8888 are supplied with various fac-
tory-set output voltages ranging from 1.5V to 3.3V. The
part number’s two-digit suffix identifies the nominal out-
put voltage. For example, the MAX8887EZK33 has a
preset output voltage of 3.3V (see the Ordering Infor-
mation).
ShutdownDrive SHDNlow to enter shutdown. During shutdown,
the output is disconnected from the input and supply
current drops to 0.1µA. When in shutdown, POK and
OUT are driven low. SHDNcan be pulled as high as
6V, regardless of the input and output voltages.
Power-OK OutputThe power-OK output (POK) pulls low when OUT is less
than 93% of the nominal regulation voltage. Once OUT
exceeds 93% of the nominal voltage, POK goes high
impedance. POK is an open-drain N-channel output.
To obtain a logic level output, connect a pullup resistor
from POK to OUT. A 100kΩresistor works well for most
applications. POK can be used as a power-on-reset
(POR) signal to a microcontroller (µC) or to drive other
logic. Adding a capacitor from POK to ground creates
POK delay. When the MAX8887 is shut down, POK is
held low independent of the output voltage. If unused,
leave POK grounded or unconnected.
Current LimitThe MAX8887/MAX8888 monitor and control the pass
transistor’s gate voltage, limiting the output current to
0.8A (typ). This current limit is reduced to 500mA (typ)
when the output voltage is below 93% of the nominal
value to provide foldback current limiting.
Thermal Overload ProtectionThermal overload protection limits total power dissipa-
tion in the MAX8887/MAX8888. When the junction tem-
perature exceeds TJ =+170°C, a thermal sensor turns
off the pass transistor, allowing the device to cool. The
thermal sensor turns the pass transistor on again after
the junction temperature cools by 20°C, resulting in a
pulsed output during continuous thermal overload con-
ditions. Thermal overload protection protects the
MAX8887/MAX8888 in the event of fault conditions. For
continuous operation, do not exceed the absolute maxi-
mum junction-temperature rating of TJ=+150°C.
Operating Region and Power DissipationThe MAX8887/MAX8888’s maximum power dissipation
depends on the thermal resistance of the IC package
and circuit board. The temperature difference between
the die junction and ambient air, and the rate of air flow.
The power dissipated in the device is P = IOUT✕(VIN-
VOUT). The maximum allowed power dissipation is
727mW or:
PMAX= (TJ(MAX)- TA) / (θJC+ θCA)
where TJ(MAX)-TAis the temperature difference
between the MAX8887/MAX8888 die junction and the
surrounding air; θJCis the thermal resistance from the
junction to the case; and θCAis the thermal resistance
from the case through PC board, copper traces, and
other materials to the surrounding air.
Refer to Figure 2 for the MAX8887/MAX888 valid oper-
ating region.
Noise ReductionFor the MAX8887 only, an external 0.01µF bypass
capacitor at BP creates a lowpass filter for noise reduc-
tion. The MAX8887 exhibits 42µVRMSof output voltage
noise with CBP = 0.01µF and COUT= 2.2µF (see the
Typical Operating Characteristics).
Applications Information
Capacitor Selection and Regulator
StabilityConnect a 2.2µF ceramic capacitor between IN and
ground and a 2.2µF ceramic capacitor between OUT
and ground. The input capacitor (CIN) lowers the
source impedance of the input supply. Reduce noise
and improve load-transient response, stability, and
power-supply rejection by using a larger ceramic out-
put capacitor such as 4.7µF.
The output capacitor’s (COUT) equivalent series resis-
tance (ESR) affects stability and output noise. Use out-
MAX8887/MAX8888
Low-Dropout, 300mA Linear Regulators in SOT23
