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MAX6478BL33AD3MAXIMN/a120avai300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit
MAX6479BL25AD3MAXIMN/a790avai300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit


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MAX6478BL33AD3-MAX6479BL25AD3
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/
MAX6484feature 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
Features
3 ✕3 UCSP, 6-Pin SOT23, and 8-Pin QFN PackagesPreset +1.5V to +3.3V Output (100mV Increments)SET Pin for Adjustable Output Voltage75µVRMSLDO Output Voltage Noise
(MAX6477–MAX6484)
±2.0% Accuracy Over TemperatureGuaranteed 300mA Output CurrentLow Dropout Voltage
55mV at 150mA
114mV at 300mA
82µA Supply Current, 0.1µA Shutdown CurrentInput Reverse Current, Thermal and Short-Circuit
Protection
Microprocessor Reset with Four Timeout OptionsPush-Pull or Open-Drain RESETManual Reset Input Remote Feedback Sense
MAX6469–MAX6484
300mA LDO Linear Regulators with
Internal Microprocessor Reset Circuit
Ordering Information

19-2532; Rev 2; 6/03
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.Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.
*Future product—contact factory for availability.
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND, unless otherwise noted.)
IN, SHDN, OUT, FB..................................................-0.3V to +7V
MR, SET.......................................................-0.3V to (VIN+ 0.3V)RESET(push-pull) ...................................-0.3V to (VOUT+ 0.3V)
RESET(open drain)..................................................-0.3V to +7V
OUT Short Circuit.......................................................Continuous
Input/Output Current (all pins except IN and OUT)............20mA
Continuous Power Dissipation (TA= +70°C)
3 x 3 UCSP (derate 10.5mW/°C above +70°C)............840mW
6-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
8-Pin Thin QFN
(derate 24.4mW/°C above +70°C)..............................1951mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS

(VIN= (VOUT+ 0.5V) or +2.5V, whichever is greater, COUT= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,
unless otherwise noted.) (Note 2)
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:
The MAX6477–MAX6484 are constructed using a unique set of packaging techniques that impose a limit on the thermal pro-
file the devices can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder
profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and
Convection reflow. Pre-heating is required. Hand or wave soldering is not allowed.
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
ELECTRICAL CHARACTERISTICS (continued)

(VIN= (VOUT+ 0.5V) or +2.5V, whichever is greater, COUT= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Note 2:
All devices are 100% production tested at +25°C and are guaranteed by correlation for TA= TMINto TMAX.
Note 3:
Guaranteed by design.
Note 4:
Dropout voltage is defined as (VIN- VOUT) when VOUTis 2% below the value of VOUTfor VIN= VOUT(NOM)+ 1V.
Note 5:
MAX6473/MAX6474/MAX6481/MAX6482 are guaranteed by design for VOUT< 2.5V.
Note 6:
Select the reset timeout period using the Reset Timeout Delay Guide(Table 3). Insert the appropriate suffix in the part number
when ordering.
ELECTRICAL CHARACTERISTICS (continued)

(VIN= (VOUT+ 0.5V) or +2.5V, whichever is greater, COUT= 3.3µF, TA= -40°C to +85°C. Typical specifications are at TA= +25°C,
unless otherwise noted.) (Note 2)
GROUND CURRENT vs. INPUT VOLTAGE
(NO LOAD)

MAX6469 toc01
INPUT VOLTAGE (V)
GROUND CURRENT (4321
GROUND CURRENT vs. INPUT VOLTAGE
(300mA LOAD)
MAX6469 toc02
INPUT VOLTAGE (V)
GROUND CURRENT (
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6469 toc03
RESET THRESHOLD OVERDRIVE (mV)
PULSE DURATION (
Typical Operating Characteristics
(VIN= 5V, VOUT= 3.3V, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
DROPOUT VOLTAGE vs. LOAD CURRENT

MAX6469 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
PSRR vs. FREQUENCY
MAX6469 toc05
FREQUENCY (kHz)
PSRR (dB)
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX6469 toc06
LOAD CURRENT (mA)
OUT
ESR (
OUTPUT NOISE
MAX6469 toc07
500µs/div
100µV/div
10010010k100k
OUTPUT NOISE vs. FREQUENCY

MAX6469 toc08
FREQUENCY (Hz)
RMS
SHUTDOWN RESPONSE

MAX6469 toc09
20ms/div
VOUT
2V/div
VSHDN
5V/div
STARTUP RESPONSE

MAX6469 toc10
10µs/div
VIN
2V/div
VOUT
2V/div
MAX6469 toc11
100µs/div
VOUT
20mV/div
LOAD-TRANSIENT RESPONSE

MAX6469 toc12
10µs/div
VOUT
5mV/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
Typical Operating Characteristics (continued)

(VIN= 5V, VOUT= 3.3V, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE

MAX6469 toc17
TEMPERATURE (°C)
NORMALIZED OUTPUT VOLTAGE3510-15
MAX6469 toc13
100µs/div
VOUT
20mV/div
AC-COUPLED
4.5V
VIN
500mV/div
LINE TRANSIENT RESPONSE

MAX6469 toc14
200ms/div
VIN
1V TO 4V
2V/div
RESET
2V/div
RESET DELAY RESPONSE

MAX6469 toc15
200ns/div
2V/div
RESET
2V/div
RESET RESPONSE TO MR

MAX6469 toc16
200ms/div
VOUT
2V/div
RESET
2V/div
RESET RESPONSE TO VIN RISING

VIN
5V/divypical Operating Characteristics (continued)
(VIN= 5V, VOUT= 3.3V, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
MAX6469/MAX6470/MAX6477/MAX6478 Pin Description
MAX6471/MAX6472/MAX6479/MAX6480 Pin Description
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
MAX6473/MAX6474/MAX6481/MAX6482 Pin Description
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Detailed Description

The MAX6469–MAX6484 are ultra-low, quiescent cur-
rent, low-dropout linear regulators with an integrated
microprocessor reset circuit. These devices guarantee
300mA (min) drive capabilities and are available with
preset output voltages in 100mV increments between
+1.5V and +3.3V. The internal reset circuit monitors the
regulator output voltage and asserts the reset output
when the regulator output is below the microprocessor
supply tolerance.
Regulator

The regulator core operates with +2.5V to +5.5V input
voltage range. The output voltage is offered in 100mV
increments between +1.5V and +3.3V (contact factory
for other output voltage options). The MAX6469–
MAX6472/MAX6477–MAX6480 offer an adjustable out-
put voltage implemented with an external resistor-
divider network between OUT, SET, and GND (Figure
1). SET must be connected to either GND for fixed
VOUTor to an external divider for adjustable VOUT. The
MAX6469–MAX6472/MAX6477–MAX6480 automatically
determine the feedback path depending on the con-
nection of SET. The Typical Operating Circuit shows a
typical connection for the MAX6469. OUT is an internal-
ly regulated low-dropout (LDO) linear regulator that
powers a microprocessor.
Reset Circuit

The reset supervisor circuit is fully integrated in the
MAX6469–MAX6484 and uses the same reference volt-
age as the regulator. Two supply tolerance reset
thresholds, -7.5% and -12.5%, are provided for each
type of device.
-7.5% Reset: Reset does not assert until the regulator

output voltage is at least -5% out of tolerance and
always asserts before the regulator output voltage is
-10% out of tolerance.
-12.5% Reset:
Reset does not assert until the regulator
output voltage is at least -10% out of tolerance and
always asserts before the regulator output voltage is
-15% out of tolerance.
RESETOutput
A µP’s reset input starts the µP in a known state. The
MAX6469–MAX6484 µP supervisory circuits assert
RESETduring power-up, power-down, and brownout
conditions. RESETasserts when the input voltage is
below the undervoltage lockout threshold. RESET
asserts when VOUTis below the reset threshold and
remains asserted for at least the minimum selected reset
timeout period (tRP, Table 3) after VINrises above the
undervoltage lockout threshold and VOUTrises above
the reset threshold. RESETasserts when MRis pulled
low (MAX6471–MAX6474/MAX6479–MAX6482).RESET
asserts when SHDNis pulled low (MAX6469/
MAX6470/MAX6473–MAX6478/MAX6481–MAX6484).
Shutdown
(MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 only)

SHDNallows the regulator to shut down, thereby reduc-
ing the total IINconsumption of the device. SHDNpro-
vides a digitally controlled active-low shutdown. In
shutdown mode, the pass transistor, control circuit, and
reference turn off to reduce the supply current to below
0.1µA. Connect SHDNto IN for normal operation.
Manual Reset Input
(MAX6471–MAX6474/MAX6479–MAX6482 only)

Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset while the regulator output voltage is still
within tolerance.
Reset remains asserted while MRis low and for the
reset timeout period (tRP) after MRreturns high. TheMRinput has an internal pullup of 40kΩ(typ) to OUT.can be driven with TTL/CMOS logic levels or with
open-drain/collector outputs. Connect a normally open
switch from MRto GND to create a manual reset func-
tion; external debounce circuitry is not required. If MR
is driven from long cables or the device is used in a
noisy environment, connect a 0.1µF capacitor from MR
to GND to provide additional noise immunity.
Feedback Input
(MAX6475/MAX6476/MAX6483/MAX6484 only)

The feedback input (FB) connects to an internal resistor-
divider network (Functional Diagram). FB is not internally
connected to VOUT, and as a result can be used to
MAX6469–MAX6484
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit

remotely sense the output voltage of the device. Using
FB with an external NPN transistor, the current drive
capability can be increased according to the following
equation (Figure 2):
IOUT(TOTAL)= IOUT ✕ (β+1)
The external NPN pass transistor must meet specifica-
tions for current gain, power dissipation, and collector
current. The beta influences the maximum output cur-
rent the circuit can deliver. The largest guaranteed out-
put current is given by ILOAD (max) = 300mA ×beta
(min). The transistor’s rated power dissipation must
exceed the actual power dissipated in the transistor.
The power dissipated (PD) equals the maximum load
current (ILOAD (max)) times the maximum input-to-out-
put voltage differential: PD = ILOAD (max) ×(VIN (max) -
VOUT). The rated transistor collector current must
exceed the maximum load current.
Reverse Leakage Protection
Reverse OUT to IN Current

An internal circuit monitors the MAX6469–MAX6484
input and output voltages. When the output voltage is
greater than the input voltage, the internal IN-to-OUT
pass transistor and parasitic diode turn off. An external
voltage applied to OUT does not reverse charge a bat-
tery or power source applied to IN (the leakage path
from OUT to IN is 0.01µA typ). When the output voltage
exceeds the input voltage, OUT powers the device and
shutdown must be logic high (greater than 0.7 ✕VOUT).RESETasserts until IN exceeds OUT and OUT is above
the specified VTHOUTthreshold (based on the selected
or adjusted regulator OUT nominal voltage).
Reverse OUT to Ground Current

The MAX6469–MAX6484 maintain a low OUT-to-GND
reverse-current flow when the IN power source is
removed. When IN floats (input battery removed) and
SHDNis pulled up to VOUT(by an external diode), the
OUT-to-GND current through the LDO is 40µA (typ). The
regulator output can be held up with an external super
capacitor or backup battery at OUT until the IN battery is
replaced. The RESEToutput is asserted while the IN bat-
tery is removed to place the system in a low-power
mode. Volatile memory content is maintained until the
super capacitor or battery voltage drops below RAM
standby specifications. RESETdeasserts when the IN
battery has been replaced and OUT exceeds the
desired reset threshold. For nonrechargeable backup
battery applications, place a reverse diode between
OUT and the backup battery (to prevent battery charg-
ing). The external diode does not affect the regulator’s
dropout voltage because it is not between the LDO out-
put and the processor/memory Vcc supply. The diode
can be replaced with a current-limiting resistor for
rechargeable backup battery applications.
Current Limit

The MAX6469–MAX6484 include an internal current-
limit circuit that monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 450mA
(min). The output can be shorted to ground indefinitely
without damaging the part.
Thermal Shutdown

When the junction temperature (TJ) exceeds +180°C
(typ), the thermal sensor signals the shutdown logic,
turning off the pass transistor and allowing the IC to
Figure 2. High-Current, External Transistor Application
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