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PDF MAX1818 Data sheet ( Hoja de datos )
| Número de pieza | MAX1818 | |
| Descripción | 500mA Low-Dropout Linear Regulator in SOT23 | |
| Fabricantes | Maxim Integrated | |
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19-1860; Rev 1; 3/01
500mA Low-Dropout
Linear Regulator in SOT23
General Description
The MAX1818 low-dropout linear regulator operates
from a +2.5V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 120mV dropout. The
high-accuracy (±1%) output voltage is preset at an
internally trimmed voltage (see Selector Guide) or can
be adjusted from 1.25V to 5.0V with an external resis-
tive divider.
An internal PMOS pass transistor allows the low 125µA
supply current to remain independent of load, making
this device ideal for portable battery-operated equip-
ment such as personal digital assistants (PDAs), cellu-
lar phones, cordless phones, base stations, and
notebook computers.
Other features include an active-low open-drain reset
output that indicates when the output is out of regula-
tion, a 0.1µA shutdown, short-circuit protection, and
thermal shutdown protection. The device is available in
a miniature 800mW 6-pin SOT23 package.
Applications
Notebook Computers
Cellular and Cordless Telephones
Personal Digital Assistants (PDAs)
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
Pin Configuration
Features
o Guaranteed 500mA Output Current
o Low 120mV Dropout at 500mA
o ±1% Output Voltage Accuracy
Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V, 5V
Adjustable from 1.25V to 5.0V
o Power OK Output
o Low 125µA Ground Current
o 0.1µA Shutdown Current
o Thermal Overload Protection
o Output Current Limit
o Tiny 800mW 6-Pin SOT23 Package
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX1818EUAT_ _ -40°C to +85°C 6 SOT23-6
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Note: The MAX1818 requires a special solder temperature
profile described in the Absolute Maximum Ratings section.
Selector Guide
PART AND
SUFFIX
MAX1818EUT15
MAX1818EUT18
MAX1818EUT20
MAX1818EUT25
MAX1818EUT33
MAX1818EUT50
VOUT
1.5V or Adj
1.8V or Adj
2.0V or Adj
2.5V or Adj
3.3V or Adj
5.0V or Adj
SOT23
TOP MARK
AASO
AANU
AANV
AANF
AANG
AANH
Typical Operating Circuit
TOP VIEW
IN 1
6 OUT
MAX1818
POK 2
5 SET
SHDN 3
4 GND
SOT23
VIN = 2.5V TO 5.5V
CIN
1µF
NINC
OUT
MAX1818
ON
SHDN
OFF
POK
SET GND
VOUT
COUT
3.3µF
RPOK
100k
TO
µC
________________________________________________________________ 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.
1 page  
500mA Low-Dropout
Linear Regulator in SOT23
Typical Operating Characteristics (continued)
(VIN = (VOUT + 500mV) or +2.5V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 3.3µF, TA = +25°C, unless otherwise noted.)
SHUTDOWN WAVEFORM
MAX1818 toc12
SHORT-CIRCUIT CURRENT LIMIT
vs. SUPPLY VOLTAGE
1.11
1.10 VOUT(NOM) = +2V
SHUTDOWN
VOLTAGE
1.09
0 1.08
1.07
VOUT
1.06
0
1.05
2V/div
1.04
1.03
1.02
POK 0
1.01
200µs/div
1.00
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
Pin Description
PIN NAME
FUNCTION
1 IN Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1µF capacitor to GND (see
Capacitor Selection and Regulator Stability).
2
POK
Open-Drain POK Output. POK remains low while the output voltage (VOUT) is below the POK threshold.
Connect a 100kΩ pull-up resistor from POK to OUT to obtain an output voltage.
3
SHDN
Active-Low Shutdown Input. A logic low reduces supply current below 15µA. In shutdown, the POK output is
low, and OUT is high impedance. Connect to IN for normal operation.
4 GND Ground
5
SET
Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive voltage-divider between
OUT and GND to set the output voltage between 1.25V and 5.0V.
6
OUT
Regulator Output. Sources up to 500mA. Bypass with a 3.3µF low-ESR capacitor to GND. Use a 4.7µF
capacitor for output voltages below 2V.
Detailed Description
The MAX1818 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 500mA
and is available with preset output voltages. As illustrat-
ed in Figure 1, the MAX1818 consists of a 1.25V refer-
ence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
The 1.25V reference is connected to the error amplifier,
which compares this reference with the feedback volt-
age and amplifies the difference. If the feedback volt-
age is lower than the reference voltage, the
pass-transistor gate is pulled lower, which allows more
current to pass to the output and increases the output
voltage. If the feedback voltage is too high, the pass-
transistor gate is pulled up, allowing less current to
pass to the output.
The output voltage is fed back through either an inter-
nal resistive divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines VSET and selects the feedback
path. If VSET is below 50mV, the internal feedback path
is used and the output is regulated to the factory-preset
voltage.
_______________________________________________________________________________________ 5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX1818.PDF ] | |
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