MAX1963A/MAX1976A
Low-Input-Voltage, 300mA LDO Regulators
with
RESET
in SOT and TDFN
6 _______________________________________________________________________________________
Pin Description
PIN
THIN
SOT23
6-PIN
TDFN
(3mm x 3mm)
8-PIN
TDFN
(2mm x 2mm)
NAME FUNCTION
16 8IN
Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN
with at least a 1µF ceramic capacitor to GND (see the Capacitor Selection and
Regulator Stability section).
2 — — GND
Ground. GND also functions as a heatsink. Solder to a large pad or circuit-
board ground plane to maximize SOT23 power dissipation.
— 4 5 GND Ground
35 6SHDN
Active-Low Shutdown Input. A logic-low reduces supply current to below 1µA.
Connect to IN or logic-high for normal operation.
43 4RESET
Open-Drain, Active-Low Reset Output. RESET rises 3.2ms (MAX1963A) or
100ms (MAX1976A) after the output has achieved regulation. RESET falls
immediately if V
OUT
drops below 82.5% of its nominal voltage, or if the
MAX1963A/MAX1976A are shut down.
5 2 3 I.C. Internally Connected. Leave unconnected or connect to GND.
6 1 1 OUT
Regulator Output. Sources up to 300mA. Bypass with a 4.7µF low-ESR
ceramic capacitor to GND.
— — 2, 7 N.C. No Connection. Not internally connected.
—— — EP
Ground (TDFNs only). EP also functions as a heatsink. Solder EP to a large
pad or circuit-board ground plane to maximize TDFN power dissipation.
MAX1963A
MAX1976A
IN
GND
SHDN
SHUTDOWN
LOGIC
THERMAL
SENSOR
REF
82.5%
REF
TIMER
ERROR
AMP
MOS DRIVER
WITH I
LIMIT
OUT
RESET
P
Figure 1. Functional Diagram
