MAX6349 MAXIM [Maxim Integrated Products], MAX6349 Datasheet - Page 7

• Manufacturer Part Number: MAX6349
• Description: 150mA, SOT23, Low-Dropout Linear Regulators with Internal Microprocessor Reset Circuit
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 2. Functional Diagram
5% reset: Reset does not assert until the regulator out-
put voltage is at least -5% out of tolerance and always
asserts before the regulator output voltage is -10% out of
tolerance.
10% reset: Reset does not assert until the regulator
output voltage is at least -10% out of tolerance and
always asserts before the regulator output voltage is
-15% out of tolerance.
A µP’s reset input starts the µP in a known state. The
MAX6329/MAX6349 µP supervisory circuits assert a
reset during power-up, power-down, and brownout
conditions. Reset is guaranteed to be logic high or low
depending on the device chosen (see Selector Guide).
RESET or RESET asserts when V
150mA, SOT23, Low Dropout Linear Regulators
SHDN
IN
with Internal Microprocessor Reset Circuit
PROTECTION
LEAKAGE
REVERSE
_______________________________________________________________________________________
1.23V
GND
OUT
is below the reset
Reset Output
RESET
COMPARATOR
ERROR
AMP
FEEDBACK MODE
COMPARATOR
threshold and for at least 100ms (t
above the reset threshold. RESET or RESET also
asserts when MR is low (MAX6349).
SHDN allows for the regulator to shutdown thereby
reducing the total I
MAX6329 provides a digitally controlled active-low
shutdown function. In shutdown mode the pass transis-
tor, control circuit, reference, and all biases turn off,
reducing the supply current to below 1µA. Connect
SHDN to IN for normal operation.
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. For the MAX6349, a
200ms
RESET
DELAY
MR
THERMAL SENSOR
MOS DRIVER WITH
Manual Reset Input (MAX6349 only)
CURRENT LIMIT
IN
60mV
Shutdown (MAX6329 only)
consumption of the device. The
OUTPUT
STAGE
RP
) after V
OUT
SET
RESET/RESET
OUT
rises
7