19-1859; Rev 3; 11/06
Low-Dropout, 300mA Linear Regulators in SOT23
General Description
Features
The 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.
♦ Guaranteed 300mA Output Current (500mA for
Pulsed Loads)
♦ Low 100mV Dropout at 200mA Load
♦ POK Output (MAX8888)
♦ 42µV
Output Noise (MAX8887)
RMS
♦ Preset Output Voltages (1.5V, 1.8V, 2.85V, and
3.3V)
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.
♦ 55µA No-Load Supply Current
♦ Thermal Overload and Short-Circuit Protection
♦ Foldback Output Current-Limit Protection
♦ 60dB PSRR at 1kHz
♦ 0.1µA Shutdown Current
♦ Thin 5-Pin SOT23 Package, 1mm High
Ordering Information
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
PART
MAX8887EZK15+T
MAX8887EZK18+T
MAX8887EZK29+T
MAX8887EZK33+T
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
ADQD
ADPX
ADPY
ADPZ
—
________________________Applications
Notebook Computers
Wireless Handsets
MAX8887EZKxy+T* -40°C to +85°C 5 SOT23-5
PDAs and Palmtop Computers
Digital Cameras
MAX8888EZK15+T
MAX8888EZK18+T
MAX8888EZK29+T
MAX8888EZK33+T
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
-40°C to +85°C 5 SOT23-5
ADQE
ADQA
ADQB
ADQC
—
PCMCIA Cards
Hand-Held Instruments
MAX8888EZKxy+T* -40°C to +85°C 5 SOT23-5
*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.
+Denotes lead-free availability.
Typical Operating Circuit
Pin Configurations
V
OUT
INPUT
2.5V TO 5.5V
300mA
IN
OUT
TOP VIEW
C
C
OUT
IN
2.2μF
2.2μF
MAX8887
MAX8888
IN
GND
1
2
3
5
4
OUT
IN
GND
1
2
3
5
OUT
POK
(BP)
ON
MAX8887
MAX8888
SHDN
OFF
C
GND
BP
0.01μF
SHDN
BP
SHDN
4
POK
( ) ARE FOR MAX8887 ONLY.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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