L4979MD ,LOW DROP VOLTAGE REGULATORAbsolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only an ..
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L4979D-L4979MD
LOW DROP VOLTAGE REGULATOR
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L4979D
L4979MDFebruary 2002 OPERATING DC SUPPLY VOLTAGE RANGE
6V TO 31V TRANSIENT SUPPLY VOLTAGE UP TO 40V LOW QUIESCENT CURRENT CONSUMPTION
LESS THAN 20μA WITH ENABLE LOW HIGH PRECISION OUTPUT VOLTAGE (2%) LOW DROPOUT VOLTAGE LESS THAN 0.5V RESET CIRCUIT SENSING THE OUTPUT
VOLTAGE DOWN TO 1V PROGRAMMABLE RESET PULSE DELAY
WITH EXTERNAL CAPACITOR WATCHDOG PROGRAMMABLE WATCHDOG TIMER WITH
EXTERNAL CAPACITOR THERMAL SHUTDOWN AND SHORT
CIRCUIT PROTECTION WIDE TEMPERATURE RANGE (Tj = -40°C TO
150°C)
DESCRIPTIONL4979 is a family of low dropout linear regulators with
microprocessor control functions such as power on re-
set, low voltage reset, watchdog timer, on-off control or
Enable. In addition, only low value ceramic capacitor is
required for stability (above or equal to 100nF).
Maximum quiescent current is 20μA at all output current
equal 0 and enable low.
Typical quiescent current is 1.5mA at output current
equal to 5mA, 3mA at output current equal to 150mA,
and drops to 10mA in "not enabled" mode.
On chip trimming results in high output voltage accu-
racy (2%). Accuracy is kept over wide temperature
range, line variation, load variation.
The maximum input voltage is 40V. The maximum
output current is 200mA. Output current is internally
limited. Internal temperature protection disables volt-
age regulator at overtemperature.
PRODUCT PREVIEWLOW DROP VOLTAGE REGULATOR
BLOCK DIAGRAM
L4979MD L4979D2/10
PIN FUNCTION
PINS CONNECTION
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L4979MD L4979D
ABSOLUTE MAXIMUM RATINGSStresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at any condition above those indicated in the operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
THERMAL DATA(*) with 6 sq. cm on board heat sink
ELECTRICAL CHARACTERISTCS(Vs = 5.6V to 31V, Tj = -40°C to +150°C unless otherwise specified)
L4979MD L4979D4/10
ELECTRICAL CHARACTERISTICS (continued)
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L4979MD L4979D
ELECTRICAL CHARACTERISTICS (continued)
L4979MD L4979D6/10
VOLTAGE REGULATORVoltage regulator uses a pchannel transistor as a regulating element. With this structure very low dropout volt-
age at current up to 150mA is obtained. The output voltage is regulated up to transient input supply voltage of
40V. No functional interruption due to over-voltage pulses is generated. The high precision of the output voltage
is obtained with a pre-trimmed reference voltage. A short circuit protection to GND is provided.
RESETThe reset circuit supervises the output voltage Vo. The Vo_th reset threshold is defined with the internal refer-
ence voltage and a resistor output divider. If the output voltage becomes lower than Vo_th then Res goes low
with a reaction time trr. If the output voltage becomes lower than 2.0V (typ) than Res goes immediately low. The
reset low signal is guaranteed for an output voltage Vo greater than 1V.
When the output voltage becomes higher than Vo_th then Res goes high with a delay trd. This delay is obtained
by an internal oscillator. Oscillator period is given by
where:
Icr is an internally generated charge current,osc rhth Vrlth– () Ctr⋅ []cr
---- --------------- --------------- -------------------- V rhth Vrlth– () Ctr⋅ []cd
----------- ---------------- --------------- ------------+=
ELECTRICAL CHARACTERISTICS (continued)
