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Part: MAX6481
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6469, MAX6470, MAX6471, MAX6472, MAX6473, MAX6474, MAX6475, MAX6476, MAX6477, MAX6478, MAX6479, MAX6480, MAX6481, MAX6482, MAX6483, MAX6484 300mA LDO Linear Regulators With Internal Microprocessor Reset Circuit
Company: Maxim Integrated Products
Datasheet: Download MAX6481 datasheet File size : 13806 kB
Request For quote: Find where to buy MAX6481
Datasheet text preview:
19-2532; Rev 2; 6/03
KIT ATION EVALU ABLE AVAIL
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit
General Description 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 (MAX6477MAX6484) 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
MAX6469MAX6484
The MAX6469MAX6484 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. The low supply current, low dropout volta g e , and integrated reset functionality make these devices ideal for battery-powered portable equipment. The MAX6469MAX6484 include a reset output that indicates 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 opendrain active-low reset outputs are available, with reset timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min). The MAX6469/MAX6470/MAX6473MAX6478/MAX6481 MAX6484 also have a shutdown feature that reduces the supply current to 0.1µA (typ). The MAX6471MAX6474/ MAX6479MAX6482 offer a manual reset input to assert a microprocessor reset while the regulator output is within s p e c i f i c a t i o n . The MAX6475/MAX6476/MAX6483/ MAX6484 feature a remote feedback sense pin for use with an external NPN transistor for higher-current applications. The MAX6469MAX6476 are available in 6-pin SOT23 and 8-pin thin QFN packages. The MAX6477 MAX6484 are available in a 3 × 3 chip-scale package (UCSPTM). All devices are specified for operation from -40°C to +85°C.
Ordering Information
PART MAX6469UT_ _ _D_-T MAX6469TA_ _ _D_* MAX6470UT_ _ _D_-T MAX6470TA_ _ _D_* TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 6 SOT23-6 8 Thin QFN 6 SOT23-6 8 Thin QFN
Applications
Hand-Held Instruments (PDAs, Palmtops) PCMCIA Cards/USB Devices Cellular/Cordless Telephones CD/DVD Drives Notebook Computers Digital Cameras Bluetooth Modules/Wireless LAN
*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 available 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.
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.
________________________________________________________________ Maxim Integrated Products
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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.
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6469MAX6484
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
Note 1: The MAX6477MAX6484 are constructed using a unique set of packaging techniques that impose a limit on the thermal profile 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.
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.
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)
PARAMETER Input Voltage Range Input Undervoltage Lockout Supply Current (Ground Current) Shutdown Supply Current REGULATOR CIRCUIT Output Current Output Voltage Accuracy (Fixed Output Voltage Operation, Table 1) MAX6469MAX6476 Output Voltage Accuracy (Fixed Output Voltage Operation, Table 1) MAX6477MAX6484 Adjustable Output Voltage Range SET Reference Voltage SET Dual ModeTM Threshold SET Input Leakage Current 1mA IOUT 150mA, TA = +25°C 1mA IOUT 150mA, TA = -40°C to +85°C 1mA IOUT 300mA, TA = -40°C to +85°C 2mA IOUT 100mA, TA = +25°C 2mA IOUT 100mA, TA = -40°C to +85°C 2mA IOUT 300mA, TA = -40°C to +85°C (Note 3) V SET ISET VSET = 0, +1.2V (Note 3) SYMBOL VIN V UVLO IQ IS H D N VIN falling IOUT = 0 IOUT = 300mA TA = +25°C 300 -1.3 -2.3 -2.7 -1.1 -2.0 -2.5 V SET 1.200 CONDITIONS MIN 2.5 2.25 82 96 0.1 TYP MAX 5.5 2.47 136 1 UNITS V V µA µA mA +1.3 +2.3 +2.7 +1.1 +2.0 +2.5 5.0 1.258 ±100 V V mV nA % %
1.229 185 ±20
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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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, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS VOUT = +3.3V (fixed output operation) VOUT = +3.0V (fixed output operation) VDO VOUT = +2.8V (fixed output operation) VOUT = +2.5V (fixed output operation) Output Current Limit Input Reverse Leakage Current (OUT to IN Leakage Current) Startup Time Response SHDN Input Low Voltage SHDN Input High Voltage SHDN Input Current Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis Line Regulation Load Regulation TSHDN TSHDN VOUT = 1.5V, 2.5V VIN 5.5V, IOUT = 10mA VOUT = 1.5V, VIN = 2.5V, 1mA IOUT 150mA 10Hz to 100kHz, CIN = 0.1µF, IOUT = 100mA, VOUT = 1.5V MAX64_ _ _ _ _ _ A V THOUT MAX64_ _ _ _ _ _ B MAX6469MAX6476 MAX6477MAX6484 VIL VIH SHDN = VIN or GND 0.7 × VIN -1 0.1 180 20 0.09 0.2 150 µVRMS 75 +1 VIN 2.5V (Note 3) VIN = 4V, VOUT = 5.5V, SHDN deasserted Rising edge of VIN or SHDN to VOUT within specification, RL = 68, SET = GND, IOUT = 10mA IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA IOUT = 50mA IOUT = 150mA IOUT = 300mA 450 0.01 1.5 MIN TYP 23 55 114 25 61 114 26 65 137 30 75 158 MAX 32 90 180 40 100 190 50 110 210 60 150 250 UNITS
MAX6469MAX6484
Dropout Voltage (Notes 3, 4)
mV
mA µA
20 0.3 × VIN
µs V V µA °C °C %/V %
Output Voltage Noise
RESET CIRCUIT VOUT Reset Threshold (VFB for MAX6475/MAX6476/ MAX6483/MAX6484) (Note 5) VOUT to Reset Delay (VFB for MAX6475/MAX6476/ MAX6483/MAX6484) D1 Reset Timeout Period (Note 6) tRP D2 D3 D4 2.5 20 150 1200 90 85 92.5 87.5 35 3.75 30 225 1800 5.0 40 300 2400 ms 95 90 %VOUT
µs
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