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PDF LM9076 Data sheet ( Hoja de datos )
| Número de pieza | LM9076 | |
| Descripción | 150mA Ultra-Low Quiescent Current LDO Regulator with Delayed Reset Output | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 2003
LM9076
150mA Ultra-Low Quiescent Current LDO Regulator with
Delayed Reset Output
General Description
The LM9076 is a 5 Volt, +/-2%, 150mA logic controlled
voltage regulator. The regulator features an active low de-
layed reset output flag which can be used to reset a micro-
processor system at turn-ON and in the event that the regu-
lator input voltage falls below a minimum value. An external
capacitor programs a delay time interval before the reset
output pin can return high.
Designed for automotive and industrial applications, the
LM9076 contains a variety of protection features such as
thermal shutdown, input transient protection and a wide
operating temperature range. The LM9076 uses an PNP
pass transistor which allows low drop-out voltage operation.
Features
n Ultra Low Ground Pin Current, 25µA typical for 100µA
load
n VOUT initial accuracy of +/-1%
n VOUT accurate to +/2% over Load and Temperature
Conditions
n Low Dropout Voltage, 200mV typical with 150mA load
n Low Off State Ground Pin current
n Delayed RESET output pin for low VOUT detection
n +70V/-50V Voltage Transients
n Operational VIN up to +40V
Typical Application
Package Outline
20083030
20083027
Top View
Part Number LM9076S–5.0
See NS TO-263 Package Number TS5
20083028
Top View
Part Number LM9076BMA–5.0
See NS SOIC Package Number M08A
© 2004 National Semiconductor Corporation DS200830
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Output Voltage vs Junction Temperature
20083038
Application Information
REGULATOR BASICS
This regulator is suitable for Automotive applications where
continuous connection to the battery is required (refer to the
Typical Application circuit).
The pass transistor of the regulator is an PNP device. A 10uF
capacitor on the VOUT pin will provide adequate performance
in most circumstances. There is no maximum value for the
regulator output bypass capacitance.
INPUT CAPACITOR
The LM9076 requires a low source impedance to maintain
regulator stability because portions of the internal bias cir-
cuitry are connected directly to VIN. At a minimum, at 0.1µF
ceramic capacitor should be placed between the LM9076
VIN and Ground pins, as close as is physically possible.
OUTPUT CAPACITOR
An output capacitor is also required for stability. This capaci-
tor must be placed between the LM9076 VOUT and Ground
pins, as close as is physically possible, using traces that are
not part of the main load current path.
The output capacitor must meet the requirements for mini-
mum capacitance and also maintain the appropriate ESR
value of the full operating ambient temperature range to
assure stability. There is no maximum limit for the output
capacitance value, as long as ESR is maintained. See the
Typical Performance Characteristics curves for details.
Solid tantalum capacitors are recommended as they gener-
ally maintain capacitance and ESR ratings over a wide tem-
perature range.
Ceramic capacitor types XR7 and X5R may be used if a
series resistor is added to simulate the ESR requirement.
Aluminum electrolytic capacitors are not recommend, as
they are subject to wide changes in capacitance and ESR
values across temperature.
DELAY CAPACITOR
The capacitor on the Delay pin must be a low leakage type
since the charge current is minimal (500nA typical) and the
pin must fully charge to 5V. Ceramic, Mylar, and polystyrene
capacitor types are generally recommended, although
changes in capacitance values across temperature changes
will have some effect on the delay timing.
SHUTDOWN PIN
The basic On/Off control of the regulator is accomplished
with the SHUTDOWN pin. By pulling the SHUTDOWN pin
high the regulator output is switched Off. When the regulator
is switched Off the load on the battery will be primarily due to
the SHUTDOWN pin current.
When the SHUTDOWN pin is low, or left open, the regulator
is switched On. When an unregulated supply, such as V
BATTERY , is used to pull the SHUTDOWN pin high a series
resistor in the range of 10KΩ to 50KΩ is recommended to
provide reverse voltage transient protection of the SHUT-
DOWN pin. Adding a small capacitor (0.001uF typical) from
the SHUTDOWN pin to Ground will add noise immunity to
prevent accidental turn on due to noise on the supply line.
RESET FLAG
Proper operation of the RESET circuity is not guaranteed for
VIN voltages of less than 2.0V. The RESET pin will provide
information on the status of the regulator VOUT voltage level.
Any condition that causes the VOUT voltage to drop to typi-
cally 89% normal would cause the RESET pin to go low. This
will warn of a system Vcc supply that may cause abnormal
operation.
Of course, when the regulator is switched Off in normal
operation the RESET pin will be low.
If the regulator is On, and then switched off, the RESET flag
will go low when the VOUT voltage stored on the output
capacitor has decayed adequately.
Excessive thermal dissipation of the device such that the
Thermal Shutdown circuit is activated which then switches
the regulator output Off, would cause the RESET pin to go
low.
The RESET pin is an open collector output and requires an
external pull-up resistor to VOUT . The external pull-up resis-
tor should be in the range of 10KΩ to 200KΩ.
5 www.national.com
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