Document
19-3040; Rev 0; 10/03
Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN
General Description
The MAX1963/MAX1976 low-dropout linear regulators operate from a +1.62V to +3.6V supply and deliver a guaranteed 300mA continuous load current with a low 100mV dropout. The high-accuracy (±0.5%) output voltage is preset to an internally trimmed voltage in the +0.75V to +3.0V range. An active-low, open-drain reset output remains asserted for at least 2.2ms (MAX1963) or 70ms (MAX1976) after the output voltage reaches regulation. These devices are offered in 6-pin thin SOT23 and 6-pin 3mm x 3mm thin DFN packages. An internal PMOS pass transistor allows the low supply current to remain independent of load and dropout voltage, making these devices ideal for portable battery-powered equipment such as personal digital assistants (PDAs), cell phones, cordless phones, and notebook computers. Other features include logic-controlled shutdown, short-circuit protection, and thermal-overload protection. o Low 1.62V Minimum Input Voltage o Guaranteed 300mA Output Current o ±1.5% Accuracy Over Load/Line/Temp o Low 100mV Dropout at 300mA Load o 2.2ms (MAX1963) or 70ms (MAX1976) RESET Output Flag o Supply Current Independent of Load and Dropout Voltage o Logic-Controlled Shutdown o Thermal-Overload and Short-Circuit Protection o Preset Output Voltages (0.75V to 3.0V) o Tiny 6-Pin Thin SOT23 Package (<1.1mm High) o Thin 6-Pin TDFN Package (<0.8mm High)
Features
MAX1963/MAX1976
Applications
Notebook Computers Cellular and PCS Telephones Personal Digital Assistants (PDAs) Hand-Held Computers Digital Cameras PCMCIA Cards CD and MP3 Players
PART* MAX1963EZT_ _ _-T MAX1963ETT_ _ _-T MAX1976EZT_ _ _-T MAX1976ETT_ _ _-T
Ordering Information
TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 6 Thin SOT23-6 6 TDFN 6 Thin SOT23-6 6 TDFN
*Insert the desired three-digit suffix (see the Selector Guide) into the blanks to complete the part number. Contact the factory for other output voltages.
Pin Configurations
TOP VIEW
INPUT 1.62V TO 3.6V CIN 1µF
Typical Operating Circuit
OUTPUT 0.75V TO 3.0V COUT LOGIC 4.7µF SUPPLY 100kΩ SHDN OFF GND RESET TO µC
IN
OUT
300mA
IN 1
6 OUT
OUT 1 I.C. 2
6 IN
GND 2
MAX1963 MAX1976
5 I.C.
MAX1963 MAX1976
5 SHDN
MAX1963 MAX1976
ON
SHDN 3
RESET 3 4 RESET
4 GND
THIN SOT23
TDFN 3mm x 3mm
Selector Guide appears 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.
Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN MAX1963/MAX1976
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RESET to GND .....................................-0.3V to +4.0V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration..............................