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PDF MAX1735 Data sheet ( Hoja de datos )
| Número de pieza | MAX1735 | |
| Descripción | 200mA / Negative-Output / Low-Dropout Linear Regulator | |
| Fabricantes | Maxim Integrated | |
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19-1783; Rev 1; 11/03
200mA, Negative-Output, Low-Dropout
Linear Regulator in SOT23
General Description
The MAX1735 negative-output, low-dropout linear regu-
lator operates from a -2.5V to -6.5V input and delivers a
guaranteed 200mA with a low 80mV dropout. The high-
accuracy (±1%) output voltage is preset or can be
adjusted from -1.25V to -5.5V with an external resistive
voltage-divider.
An internal N-channel MOSFET allows for a low 85µA
quiescent current virtually independent of the load,
making this device ideal for battery-powered portable
equipment, such as PDAs, mobile phones, cordless
phones, and wireless data modems.
The device is available in several preset output voltage
versions: -5.0V, -3.0V, and -2.5V. All versions offer a
1nA low-power shutdown mode, short-circuit protec-
tion, and thermal overload protection. The device is
offered in a tiny 5-pin SOT23 package.
Applications
Disk Drives
Modems
Instrumentation Amplifiers
Notebook Computers
Mobile and Cordless Telephones
PCMCIA Cards
GaAsFET Bias
Mobile Wireless Data Modems
PDAs and Palmtop Computers
Features
o Guaranteed 200mA Output Current
o Low 80mV Dropout Voltage at 200mA
o Low 85µA Quiescent Supply Current
o Low 1nA Current Shutdown Mode
o Stable with 1µF COUT
o PSRR >60dB at 100Hz
o Thermal Overload Protection
o Short-Circuit Protection
o -5.0V, -3.0V, or -2.5V Output Voltage
or Adjustable (-1.25V to -5.5V)
o Tiny SOT23-5 Package
PART
MAX1735EUK50-T
MAX1735EUK30-T
MAX1735EUK25-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
Output-Voltage Selector Guide
PART
MAX1735EUK50-T
MAX1735EUK30-T
MAX1735EUK25-T
PRESET OUTPUT
VOLTAGE
-5.0V or adj
-3.0V or adj
-2.5V or adj
SOT TOP
MARK
ADOZ
ADOY
ADOX
Typical Operating Circuit
-6.5V TO -2.5V
INPUT
CIN
IN
-5V, -3V, OR -2.5V
OUTPUT
UP TO 200mA
OUT
COUT
ON
GND OFF
ON
MAX1735
SHDN
GND
SET
TOP VIEW
Pin Configuration
GND 1
5 OUT
MAX1735
IN 2
SHDN 3
4 SET
SOT23-5
________________________________________________________________ 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  
200mA, Negative-Output, Low-Dropout
Linear Regulator in SOT23
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = -4.0V, VOUT = -3.0V, TA = +25°C, unless otherwise specified.)
SHUTDOWN RESPONSE
(DRIVEN FROM A POSITIVE VOLTAGE)
MAX1735 toc14a
SHUTDOWN RESPONSE
(DRIVEN BY A NEGATIVE VOLTAGE)
MAX1735 toc14b
SHUTDOWN-PIN BIAS CURRENT
vs. SHUTDOWN-PIN VOLTAGE
2.0
VSHDN
2V/div
0
0
VSHDN
2V/div
1.5
1.0
0
VOUT
2V/div
0
VOUT
2V/div
0.5
0
TIME (200µs/div)
TIME (200µs/div)
-0.5
-6.5 -5.0 -3.5 -2.0 -0.5 1.0 2.5 4.0 5.5
SHUTDOWN-PIN VOLTAGE (V)
Pin Description
PIN NAME
FUNCTION
1
GND
Ground
Regulator Input. Supply voltage can range from -2.5V to -6.5V. Bypass with a 1µF capacitor to GND
2 IN (see Capacitor Selection and Regulator Stability). This pin also functions as a heatsink. Solder to a
large PC board pad or directly to the PC board power plane to maximize thermal dissipation.
Shutdown Input. Drive SHDN to GND to turn the regulator off, reducing the input current to less than
3
SHDN
1nA. Drive SHDN above +1.6V or below -1.6V to enable the regulator. Connect SHDN to IN for
always-on operation.
Dual Mode™ Regulator Feedback Input. Connect SET to GND for the preset output voltage. Use a
4 SET resistive voltage-divider from OUT to SET to set the output voltage between -1.25V and -5.5V.
Regulation setpoint is -1.25V.
5
OUT
Regulator Output. OUT supplies up to 200mA in regulation. Bypass to GND with a 1µF ceramic
capacitor.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX1735.PDF ] | |
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