Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positive, fixed or adjustable TDFN 8 EP (3x3)

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 TDFN 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

Handheld Instruments (PDAs, Palmtops)

PCMCIA Cards/USB Devices

Cellular/Cordless Telephones

CD/DVD Drives

Notebook Computers

Digital Cameras

Bluetooth Modules/Wireless LAN

Features

o 3  3 UCSP, 6-Pin SOT23, and 8-Pin TDFN

Packages

o Preset +1.5V to +3.3V Output (100mV Increments)

o SET Pin for Adjustable Output Voltage

o 75µV

RMS

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

MAX6469–MAX6484

300mA LDO Linear Regulators with

Internal Microprocessor Reset Circuit

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-2532; Rev 6; 2/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART* TEMP RANGE

PIN-

PACKAGE

MAX6469UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6469TA_ _ _D_-T** -40°C to +85°C 8 TDFN-EP***

MAX6470UT_ _ _D_-T -40°C to +85°C 6 SOT23-6

MAX6470TA_ _ _D_-T** -40°C to +85°C 8 TDFN-EP***

Note: The first “_ _

”

are placeholders for the output voltage lev-

els 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 available on standard versions only

(Table 4). Standard versions require a minimum order incre-

ment 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.

Devices are also available in a lead(Pb)-free/RoHS-compliant

packages. Specify lead(Pb)-free by substituting a +T instead of

a -T when ordering.

Future product—contact factory for availability.

***

EP = Exposed pad.

EVALUATION KIT

AVAILABLE

Summary of content (20 pages)

PAGE 1
9-2532; Rev 6; 2/11 KIT ATION EVALU E L B AVAILA 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit The MAX6469–MAX6484 are low-dropout linear regulators 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.
PAGE 2
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.
PAGE 3
00mA LDO Linear Regulators with Internal Microprocessor Reset Circuit (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) PARAMETER SYMBOL CONDITIONS VOUT = +3.3V (fixed output operation) VOUT = +3.0V (fixed output operation) Dropout Voltage (Notes 3, 4) ∆VDO VOUT = +2.8V (fixed output operation) VOUT = +2.5V (fixed output operation) Output Current Limit VIN ≥ 2.
PAGE 4
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) PARAMETER SYMBOL MR Input Low Voltage VIL MR Input High Voltage VIH CONDITIONS MIN TYP MAX UNITS 0.3 × VOUT V 0.
PAGE 5
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit DROPOUT VOLTAGE vs. LOAD CURRENT -10 VOUT = 3.3V COUT = 3.3µF ILOAD = 30mA PSRR (dB) 50 4 COUT ESR (Ω) -20 75 -30 MAX6469 toc06 100 5 MAX6469 toc05 VOUT = 3.3V COUT = 3.3µF 3 COUT = 4.7µF 2 COUT = 3.3µF -40 25 1 -50 STABLE REGION 0 0 -60 50 100 150 200 250 300 0.01 0.1 OUTPUT NOISE MAX6469 toc07 100 1000 0 50 100 150 200 LOAD CURRENT (mA) OUTPUT NOISE vs. FREQUENCY SHUTDOWN RESPONSE VIN = 2.
PAGE 6
Typical Operating Characteristics (continued) (VIN = 5V, VOUT = 3.3V, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) LINE-TRANSIENT RESPONSE RESET RESPONSE TO MR RESET DELAY RESPONSE MAX6469 toc13 MAX6469 toc15 MAX6469 toc14 5V 4.5V VIN 500mV/div VIN 1V TO 4V 2V/div MR 2V/div RESET 2V/div RESET 2V/div VOUT 20mV/div AC-COUPLED VOUT = 3.3V ILOAD = 10mA 100µs/div 200ns/div 200ms/div MAX6469 toc16 1.012 RESET 2V/div VOUT 2V/div VIN 5V/div MAX6469 toc17 NORMALIZED OUTPUT VOLTAGE vs.
PAGE 7
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit PIN BUMP MAX6469/MAX6470 MAX6477/MAX6478 SOT23 TDFN-EP UCSP 1 1, 2 A1 NAME IN FUNCTION Regulator Input. Bypass IN to GND with a 0.1µF capacitor. 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. 4 5 C3 RESET Active-Low Reset Output.
PAGE 8
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469–MAX6484 MAX6473/MAX6474/MAX6481/MAX6482 Pin Description PIN BUMP MAX6473/MAX6474 MAX6481/MAX6482 NAME FUNCTION SOT23 TDFN-EP UCSP 1 1, 2 A1 IN 2 3 A2 GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. 3 4 A3 SHDN Active-Low Shutdown Input. Connect SHDN to VIN for normal operation. RESET Active-Low Reset Output.
PAGE 9
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit 2.5V TO 5.5V IN OUT MAX6469–MAX6472 MAX6477–MAX6480 SET (MR) MANUAL RESET R1 COUT GND R2 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).
PAGE 10
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 specifications for current gain, power dissipation, and collector current. The beta influences the maximum output current the circuit can deliver.
PAGE 11
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Operating Region and Power Dissipation The MAX6469–MAX6484’s maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and the ambient air, and the rate of airflow.
PAGE 12
MAX6469–MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Power Dissipation Consideration UCSP Reliability 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 TDFN 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.
PAGE 13
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469–MAX6484 Table 4.
PAGE 14
MAX6469–MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Table 4.
PAGE 15
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit TOP VIEW IN 1 GND 2 MAX6469 MAX6470 SHDN 3 OUT OUT 8 7 SET RESET 6 5 6 OUT IN 1 5 SET GND 2 4 MAX6469 MAX6470 RESET MAX6471 MAX6472 MR 3 6 OUT 5 SET 4 RESET EP* SOT23-6 1 2 IN IN 3 SOT23-6 4 GND SHDN TDFN OUT OUT 8 7 SET RESET 6 5 IN 1 GND 2 MAX6471 MAX6472 MAX6473 MAX6474 SHDN 3 6 OUT 5 MR 4 RESET OUT OUT 8 7 MR RESET 6 5 MAX6473 MAX6474 EP* EP* SOT23-6 1 2 3 4 1 2 IN
PAGE 16
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469–MAX6484 Pin Configurations (continued) TOP VIEW IN GND SHDN IN GND SHDN A1 A2 A3 A1 A2 A3 MAX6481 MAX6482 MAX6477 MAX6478 C1 OUT C2 C3 C1 SET RESET OUT 3 x 3 UCSP C2 C3 MR RESET 3 x 3 UCSP IN GND MR IN GND SHDN A1 A2 A3 A1 A2 A3 MAX6483 MAX6484 MAX6479 MAX6480 C1 C2 C3 C1 C2 C3 OUT SET RESET OUT FB RESET 3 x 3 UCSP 3 x 3 UCSP UCSP DEVICES SHOWN AS MOUNTED ON PC BOARD.
PAGE 17
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit IN SHDN IN THERMAL SENSOR REVERSE LEAKAGE PROTECTION OUT SHDN* THERMAL SENSOR REVERSE LEAKAGE PROTECTION OUT MOS DRIVER WITH CURRENT LIMIT MOS DRIVER WITH CURRENT LIMIT ERROR AMP FB ERROR AMP SET** FEEDBACK-MODE COMPARATOR 1.23V MAX6475/MAX6476 MAX6483/MAX6484 1.
PAGE 18
MAX6469–MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Ordering Information (continued) PART* MAX6471UT_ _ _D_-T TEMP RANGE PINPACKAGE -40°C to +85°C 6 SOT23-6 TEMP RANGE PINPACKAGE MAX6476UT_ _ _D_-T -40°C to +85°C 6 SOT23-6 -40°C to +85°C 8 TDFN-EP*** PART* MAX6471TA_ _ _D_-T** -40°C to +85°C 8 TDFN-EP*** MAX6476TA_ _ _D_-T** MAX6472UT_ _ _D_-T -40°C to +85°C 6 SOT23-6 MAX6477BL_ _ _D_-T -40°C to +85°C 6 UCSP-6 MAX6472TA_ _ _D_-T** -40°C to +85°C 8
PAGE 19
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 20
MAX6469–MAX6484 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit Revision History PAGES CHANGED REVISION NUMBER REVISION DATE 0 07/02 Initial release 4 04/05 Removed SOT23 standard versions from the data sheet 5 12/07 Updated Typical Operating Characteristics and Pin Descriptions sections 1, 5, 7, 8 6 2/11 Added soldering temperatures to the Absolute Maximum Ratings section and corrected MAX6471/MAX6472/MAX6479/MAX6480 Pin Description section 2, 7 DESCRIPTION — 13, 1