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MAX6476 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer MAX6476
Beschreibung 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 20 Seiten
MAX6476 Datasheet, Funktion
19-2532; Rev 2; 6/03
EVAALVUAAILTAIOBNLEKIT
300mA LDO Linear Regulators with
Internal Microprocessor Reset Circuit
General Description
The MAX6469–MAX6484 are low-dropout linear regula-
tors with a fully integrated microprocessor reset circuit.
Each is available with preset output voltages from +1.5V
to +3.3V in 100mV increments and delivers up to 300mA
of load current. These devices consume only 82µA of
supply current. The low supply current, low dropout volt-
age, and integrated reset functionality make these
devices ideal for battery-powered portable equipment.
The MAX6469–MAX6484 include a reset output that indi-
cates when the regulator output drops below standard
microprocessor supply tolerances (-7.5% or -12.5% of
nominal output voltage). This eliminates the need for an
external microprocessor supervisor, while ensuring that
supply voltages and clock oscillators have stabilized
before processor activity is enabled. Push-pull and open-
drain active-low reset outputs are available, with reset
timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).
The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 also have a shutdown feature that reduces the
supply current to 0.1µA (typ). The MAX6471–MAX6474/
MAX6479–MAX6482 offer a manual reset input to assert a
microprocessor reset while the regulator output is within
specification. The MAX6475/MAX6476/MAX6483/
MAX6484 feature a remote feedback sense pin for use
with an external NPN transistor for higher-current applica-
tions. The MAX6469–MAX6476 are available in 6-pin
SOT23 and 8-pin thin QFN packages. The MAX6477–
MAX6484 are available in a 3 × 3 chip-scale package
(UCSP™). All devices are specified for operation from
-40°C to +85°C.
Applications
Hand-Held Instruments (PDAs, Palmtops)
PCMCIA Cards/USB Devices
Cellular/Cordless Telephones
CD/DVD Drives
Notebook Computers
Digital Cameras
Bluetooth Modules/Wireless LAN
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
Features
o 3 3 UCSP, 6-Pin SOT23, and 8-Pin QFN Packages
o Preset +1.5V to +3.3V Output (100mV Increments)
o SET Pin for Adjustable Output Voltage
o 75µVRMS LDO Output Voltage Noise
(MAX6477–MAX6484)
o ±2.0% Accuracy Over Temperature
o Guaranteed 300mA Output Current
o Low Dropout Voltage
55mV at 150mA
114mV at 300mA
o 82µA Supply Current, 0.1µA Shutdown Current
o Input Reverse Current, Thermal and Short-Circuit
Protection
o Microprocessor Reset with Four Timeout Options
o Push-Pull or Open-Drain RESET
o Manual Reset Input
o Remote Feedback Sense
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX6469UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6469TA_ _ _D_*
-40°C to +85°C 8 Thin QFN
MAX6470UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6470TA_ _ _D_*
-40°C to +85°C 8 Thin QFN
*Future product—contact factory for availability.
Note: The first “_ _”are placeholders for the output voltage levels
of the devices. Desired output voltages are set by the suffix found
in the Output Voltage Suffix Guide (Table 1). The third “_” is a
placeholder for the reset threshold accuracy. Desired reset
threshold accuracy is set by the suffix found in the Reset
Threshold Accuracy Guide (Table 2). The “_” following the D is a
placeholder for the reset timeout delay time. Desired reset timeout
delay time is set by the suffix found in the Reset Timeout Delay
Guide (Table 3). For example, the MAX6481BL30BD4-T has a
3.0V output voltage, 12.5% reset threshold tolerance, and a
1200ms (min) reset timeout delay. Sample stock is generally avail-
able on standard versions only (Table 4). Standard versions
require a minimum order increment of 2.5k units. Nonstandard
versions must be ordered in 10k-unit increments. Contact factory
for availability.
Ordering Information continued at end of data sheet.
________________________________________________________________ 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.






MAX6476 Datasheet, Funktion
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Typical Operating Characteristics (continued)
(VIN = 5V, VOUT = 3.3V, COUT = 3.3µF, TA = +25°C, unless otherwise noted.)
LINE TRANSIENT RESPONSE
MAX6469 toc13
5V VIN
4.5V 500mV/div
VOUT = 3.3V
ILOAD = 10mA
100µs/div
VOUT
20mV/div
AC-COUPLED
RESET DELAY RESPONSE
MAX6469 toc14
200ms/div
VIN
1V TO 4V
2V/div
RESET
2V/div
RESET RESPONSE TO MR
MAX6469 toc15
200ns/div
MR
2V/div
RESET
2V/div
RESET RESPONSE TO VIN RISING
MAX6469 toc16
RESET
2V/div
200ms/div
VOUT
2V/div
VIN
5V/div
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
1.012
NORMALIZED TO +25°C
1.006
1.000
ILOAD = 10mA
0.994 ILOAD = 150mA
ILOAD = 300mA
0.988
-40
-15 10 35 60
TEMPERATURE (°C)
85
6 _______________________________________________________________________________________

6 Page









MAX6476 pdf, datenblatt
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Power Dissipation Consideration
For the SOT23 package, any pin except the SET pin
can be used as a heatsink. If the SET pin is used as a
heatsink, excessive parasitic capacitance can affect
stability. For the QFN package, the exposed metal pad
on the back side of a package connects to GND of the
chip. This metal pad can be used as a heatsink.
UCSP Consideration
For general UCSP package information and PC layout
considerations, refer to Maxim Application Note: Wafer-
Level Chip-Scale Package.
UCSP Reliability
The chip-scale package (UCSP) represents a unique
packaging form factor that might not perform equally to
a packaged product through traditional mechanical
reliability tests. CSP reliability is integrally linked to the
users assembly methods, circuit-board material, and
usage environment. The user should closely review
these areas when considering a CSP package.
Performance through operating life test and moisture
resistance remains uncompromised, because it is pri-
marily determined by the wafer-fabrication process.
Mechanical stress performance is a greater considera-
tion for a CSP package. CSPs are attached through
direct solder contact to the users PC board, forgoing
the inherent stress relief of a packaged products lead
frame. Solder-joint contact integrity must be considered.
Information on Maxims qualification plan, test data, and
recommendations are detailed in the UCSP application
note on Maxims website at www.maxim-ic.com.
Table 1. Output Voltage Suffix Guide
SUFFIX
15
16
17
18
19
20
21
22
23
24
25
26
27
28
285
29
30
31
32
33
OUTPUT
VOLTAGE (V)
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.85
2.9
3.0
3.1
3.2
3.3
Note: Factory-trimmed custom output voltages may be avail-
able; contact factory for availability.
Table 2. Reset Threshold Accuracy Guide
SUFFIX
A
B
VOUT RESET
TOLERANCE (%)
-7.5
-12.5
Table 3. Reset Timeout Delay Guide
SUFFIX
D1
D2
D3
D4
MINIMUM RESET
TIMEOUT PERIOD (ms)
2.5
20
150
1200
12 ______________________________________________________________________________________

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