19-3684; Rev 1; ꢀ/12
Low-Input-Voltage, 300mA LDO Regulators
with RESET in SOT and TDFN
3/MX1976A
General Description
Features
The MAX1963A/MAX1976A low-dropout linear regula-
tors 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
+0.7ꢀV to +3.0V range. An active-low, open-drain reset
output remains asserted for at least 2.2ms (MAX1963A%
or 70ms (MAX1976A% after the output voltage reaches
regulation. These devices are offered in thin SOT23 and
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.
o Low 1.62V Minimum Input Voltage
o Guaranteed 300mA Output Current
o
2.5% Accuracy Over Load/Line/Temp
o Low 100mV Dropout at 300mA Load
o 2.2ms (MAX1963A) or 70ms (MAX1976A)
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 TDFN Package (<0.8mm High)
Applications
Notebook/Handheld Computers
Cellular/Smart/PDA Phones
DSC, CD/MP3 Players
PCMCIA Cards
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX1963AEZT_ _ _+T -40°C to +8ꢀ°C 6 Thin SOT23-6
MAX1963AETT_ _ _+T -40°C to +8ꢀ°C 6 TDFN-6 3mm x 3mm
Pin Configurations
MAX1963AETA_ _ _+T
-40°C to +8ꢀ°C 8 TDFN-8 2mm x 2mm
MAX1976AEZT_ _ _+T -40°C to +8ꢀ°C 6 Thin SOT23-6
TOP VIEW
MAX1976AETT_ _ _+T
MAX1976AETA_ _ _+T
MAX1976AETT_ _ _/V+T
-40°C to +8ꢀ°C 6 TDFN-6 3mm x 3mm
-40°C to +8ꢀ°C 8 TDFN-8 2mm x 2mm
-40°C to +8ꢀ°C 6 TDFN-6 3mm x 3mm
+
8
7
6
5
1
2
3
6
5
4
OUT
I.C.
IN
GND
*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.
+Denotes a lead(Pb%-free/RoHS-compliant package.
/V denotes an automotive-qualified part.
MAX1963A
MAX1976A
MAX1963A
MAX1976A
SHDN
RESET
+
1
2
3
4
Typical Operating Circuit
THIN SOT23
TDFN
2mm x 2mm
INPUT
1.62V TO 3.6V
OUTPUT
0.75V TO 3.0V
UP TO
300mA
6
5
4
IN
OUT
C
IN
1µF
LOGIC
SUPPLY
C
4.7µF
OUT
MAX1963A
MAX1976A
MAX1963A
MAX1976A
100kΩ
ON
+
1
2
3
RESET
SHDN
TO µC
OFF
GND
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.