MAX6349 MAXIM [Maxim Integrated Products], MAX6349 Datasheet

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MAX6349

Manufacturer Part Number
MAX6349
Description
150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Circuit
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX6349SPUT+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
The MAX6329/MAX6349 are low-dropout, micropower
linear voltage regulators with integrated microproces-
sor reset circuits. Each is available with preset +3.3V,
+2.5V, +1.8V, or adjustable output voltages and can
deliver up to 150mA load current. Employing internal P-
channel MOSFET pass transistors, the devices con-
sume only 25µA supply current, independent of the
device load. The low supply current, low dropout volt-
age, and integrated reset functionality make these
devices ideal for battery powered portable equipment.
The MAX6329/MAX6349 include an internal reset circuit
that indicates when the regulator output drops below
standard microprocessor supply tolerances (-5% or
-10%). The reset output remains asserted for 100ms
(min) after the regulator output exceeds the selected
reset threshold, ensuring that supply voltages and clock
oscillators have stabilized before processor activity is
enabled. Reset outputs are available in push-pull (active-
low or -high) and open-drain (active-low) options. The
internal reset circuit replaces external microprocessor
supervisors or RC-based reset time delays.
The MAX6329/MAX6349 are optimized for use with a
1µF (min) output capacitor. The regulator output volt-
age is adjustable with an external resistor-divider net-
work at SET (reset threshold voltages track the desired
output voltage). Each device includes thermal shut-
down protection, output short-circuit protection, and
reverse leakage protection. The MAX6329 includes a
shutdown feature to reduce regulator current below
1µA (max) and the MAX6349 offers a manual reset
input to assert a microprocessor reset while the regula-
tor output is within specification.
19-1889; Rev 2; 4/01
Typical Operating Circuit appears at end of data sheet.
________________________Applications
Selector Guide appears at end of data sheet.
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.
150mA, SOT23, Low-Dropout Linear Regulators
Hand-Held Instruments
Electronic Planners
Palm Top Computers
PCMCIA Cards
USB Devices
Cellular Telephones
Cordless Telephones
Modems
with Internal Microprocessor Reset Circuit
________________________________________________________________ Maxim Integrated Products
General Description
o Preset +3.3V/+2.5V/+1.8V or Adjustable Regulator
o ±3.0% Regulator Accuracy Over the Specifed
o 25µA Supply Current
o Low 180mV Dropout at 100mA Load
o Small Output Capacitor (1µF min ceramic or
o Zero Reverse Leakage Current
o Thermal and Short-Circuit Protection
o Integrated Microprocessor Reset Circuit with
o Open-Drain and Push-Pull Reset Outputs
o Regulator Shutdown Input (MAX6329) or Manual
o 6-Pin SOT23 Package
These parts offer a choice of regulator/reset voltages and reset
outputs. From the Selector Guide, insert the desired suffix let-
ters into the blanks to complete the part number. Each device
is available in nine standard versions. Sample stock is general-
ly held on standard versions only (see Standard Versions
table). Standard versions have an order increment requirement
of 2500 pieces. Nonstandard versions have an order increment
requirement of 10,000 pieces. Contact factory for availability of
nonstandard versions.
Output
Operating Range
tantalum)
100ms (min) Timeout
Reset Input (MAX6349)
MAX6329_ _ UT-T
MAX6349_ _ UT-T
TOP VIEW
PART
( ) ARE FOR MAX6349 ONLY.
(MR) SHDN
GND
IN
Ordering Information
TEMP. RANGE
1
2
3
0°C to +85°C
0°C to +85°C
SOT23-6
Pin Configuration
MAX6329/
MAX6349
6
5
4
Features
OUT
SET
RESET/RESET
6 SOT23-6
6 SOT23-6
PIN-
PACKAGE
1

Related parts for MAX6349

MAX6349 Summary of contents

Page 1

... Each device includes thermal shut- down protection, output short-circuit protection, and reverse leakage protection. The MAX6329 includes a shutdown feature to reduce regulator current below 1µA (max) and the MAX6349 offers a manual reset input to assert a microprocessor reset while the regula- tor output is within specification. ________________________Applications ...

Page 2

SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +7V SHDN to GND...........................................................-0.3V to +7V SET to GND ..............................................-0. GND ...............................................................-0.3V to +7V RESET, RESET to ...

Page 3

... M AX63_9T er, Fig ote 4) M AX63_9S / er, Fig ote MAX6349 only V IH MAX6349 only MAX6349 only MAX6349 only MAX6349 only V > 1.0V 50µA OUT SINK > 2.7V 3.2mA OUT SINK I LKG ≥ ...

Page 4

SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit (T = +25°C, unless otherwise noted.) A GROUND PIN CURRENT vs. INPUT VOLTAGE 150mA OUT OUT ...

Page 5

SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit (T = +25°C, unless otherwise noted.) A STARTUP RESPONSE 20µs/div LOAD TRANSIENT RESPONSE NEAR DROPOUT OUT 200µs/div _______________________________________________________________________________________ Typical Operating Characteristics (continued) MAX6329/49 toc10 V IN ...

Page 6

... SHDN (MAX6329 Only) Active-Low Shutdown Input. A logic low reduces the supply current to < 1µA. Connect (MAX6349 Only) Active-Low Manual Reset Input. A logic low forces a reset. Reset remains asserted for 3 MR the duration of the reset timeout period after MR transitions from low to high. Leave unconnected or ...

Page 7

... Connect SHDN to IN for normal operation. Manual Reset Input (MAX6349 only) Many µP-based products require manual reset capabil- ity, allowing the operator, a test technician, or external is below the reset logic circuitry to initiate a reset. For the MAX6349, a OUT SET 60mV OUTPUT RESET/RESET ...

Page 8

... IC’s junction temperature cools by 20°C, resulting in a pulsed output during continuous thermal- overload conditions. Thermal overload protection is designed to protect the MAX6329/MAX6349 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating +150° ...

Page 9

... In battery powered systems, this will determine the useful end-of-life battery voltage. Since the MAX6329/MAX6349 use a P-channel MOSFET pass transistor, their dropout voltage is a function of R multiplied by the load current (see Electrical Characteristics) ...

Page 10

... MAX6349SP * * MAX6349SL * * MAX6349SH * * MAX6349ZP * MAX6349ZL * MAX6349ZH * MAX6349YP * MAX6349YL * MAX6349YH * MAX6349WP * MAX6349WL * MAX6349WH * MAX6349VP * MAX6349VL * MAX6349VH * Bold items indicate standard versions. Samples are generally available on standard versions only. Contact factory for availability of nonstandard versions. 10 ______________________________________________________________________________________ REGULATOR V RESET OUT TOLERANCE -5% V -10 ...

Page 11

SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to ...

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