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PDF LM4132 Data sheet ( Hoja de datos )
| Número de pieza | LM4132 | |
| Descripción | SOT-23 Precision Low Dropout Voltage Reference | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 2005
LM4132
SOT-23 Precision Low Dropout Voltage Reference
General Description
Features
The LM4132 family of precision voltage references performs n Output initial voltage accuracy 0.05%
comparable to the best laser-trimmed bipolar references, but n Low temperature coefficient 10ppm/˚C
in cost effective CMOS technology. The key to this break n Low Supply Current, 60µA
through is the use of EEPROM registers for correction of n Enable pin allowing a 3µA shutdown mode
curvature, tempco, and accuracy on a CMOS bandgap ar- n 20mA output current
chitecture that allows package level programming to over-
come assembly shift. The shifts in voltage accuracy and
tempco during assembly of die into plastic packages limit the
maccuracy of references trimmed with laser techniques.
Unlike other LDO references, the LM4132 is capable of
odelivering up to 20mA and does not require an output ca-
pacitor or buffer amplifier. These advantages and the SOT23
.cpackaging are important for space-critical applications.
Series references provide lower power consumption than
shunt references, since they do not have to idle the maxi-
Umum possible load current under no load conditions. This
advantage, the low quiescent current (60µA), and the low
t4dropout voltage (400mV) make the LM4132 ideal for battery-
powered solutions.
The LM4132 is available in five grades (A, B, C, D and E) for
egreater flexibility. The best grade devices (A) have an initial
accuracy of 0.05% with guaranteed temperature coefficient
eof 10ppm/˚C or less, while the lowest grade parts (E) have
han initial accuracy of 0.5% and a tempco of 30ppm/˚C.
n Voltage options 2.048V, 2.5V, 4.096V
n Custom voltage options available (1.8V to 4.096V)
n VIN range of VREF + 400mV to 5.5V @ 10mA
n Stable with low ESR ceramic capacitors
n SOT23-5 Package
Applications
n Instrumentation & Process Control
n Test Equipment
n Data Acquisition Systems
n Base Stations
n Servo Systems
n Portable, Battery Powered Equipment
n Automotive & Industrial
n Precision Regulators
n Battery Chargers
n Communications
n Medical Equipment
STypical Application Circuit
www.Data om*Note: The capacitor CIN is required and the capacitor COUT is optional.
www.DataSheet4U.c© 2005 National Semiconductor Corporation DS201513
20151301
www.national.com
1 page  
Electrical Characteristics
LM4132-4.1 (VOUT = 4.096V) Limits in standard type are for TJ = 25˚C only, and limits in boldface type ap-
ply over the junction temperature (TJ) range of -40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25˚C, and are provided for
reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0
Symbol
VREF
TCVREF / ˚C
(Note 6)
Parameter
Output Voltage Initial Accuracy
LM4132A-4.1
LM4132B-4.1
LM4132C-4.1
LM4132D-4.1
LM4132E-4.1
Temperature Coefficient
LM4132A-4.1
IQ
IQ_SD
∆VREF/∆VIN
∆VREF/∆ILOAD
∆VREF
VIN - VREF
VN
ISC
VIL
VIH
LM4132B-4.1
LM4132C-4.1
LM4132D-4.1
LM4132E-4.1
Supply Current
Supply Current in Shutdown
Line Regulation
Load Regulation
Long Term Stability (Note 7)
Thermal Hysteresis (Note 8)
Dropout Voltage (Note 9)
Output Noise Voltage
Short Circuit Current
Enable Pin Maximum Low Input
Level
Enable Pin Minimum High Input
Level
Conditions
Typ
Min (Note Max
(Note 4) 5) (Note 4)
Unit
(A Grade - 0.05%)
(B Grade - 0.1%)
(C Grade - 0.2%)
(D Grade - 0.4%)
(E Grade - 0.5%)
-0.05
-0.1
-0.2
-0.4
-0.5
0.05
0.1
0.2
0.4
0.5
%
0˚C ≤ TJ ≤ + 85˚C
-40˚C ≤ TJ ≤ +125˚C
-40˚C ≤ TJ ≤ +125˚C
EN = 0V
VREF + 400mV ≤ VIN ≤ 5.5V
0mA ≤ ILOAD ≤ 20mA
1000 Hrs
-40˚C ≤ TJ ≤ +125˚C
ILOAD = 10mA
0.1 Hz to 10 Hz
10
20
20
20
20
30
60 100
37
100
25 120
50
75
175 400
350
75
35
65
ppm / ˚C
µA
µA
ppm / V
ppm / mA
ppm
mV
µVPP
mA
%VIN
%VIN
Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.
Note 2: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum
junction temperature), θJ-A (junction to ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX
= (TJMAX - TA) /θJ-A up to the value listed in the Absolute Maximum Ratings. θJ-A for SOT23-5 package is 220˚C/W, TJMAX = 125˚C.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 4: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control.
Note 5: Typical numbers are at 25˚C and represent the most likely parametric norm.
Note 6: Temperature coefficient is measured by the "Box" method; i.e., the maximum ∆VREF is divided by the maximum ∆T.
Note 7: Long term stability is VREF @25˚C measured during 1000 hrs.
Note 8: Thermal hysteresis is defined as the change in +25˚C output voltage before and after cycling the device from (-40˚C to 125˚C).
Note 9: Dropout voltage is defined as the minimum input to output differential at which the output voltage drops by 0.5% below the value measured with a 5V input.
5 www.national.com
5 Page 
Application Information
THEORY OF OPERATION
The foundation of any voltage reference is the band-gap
circuit. While the reference in the LM4132 is developed from
the gate-source voltage of transistors in the IC, principles of
the band-gap circuit are easily understood using a bipolar
example. For a detailed analysis of the bipolar band-gap
circuit, please refer to Application Note AN-56.
SUPPLY AND ENABLE VOLTAGES
To ensure proper operation, VEN and VIN must be within a
specified range. An acceptable range of input voltages is
VIN > VREF + 400mV (ILOAD ≤ 10mA)
The enable pin uses an internal pull-up current source (IP-
ULL_UP ) 2µA) that may be left floating or triggered by an
external source. If the part is not enabled by an external
source, it may be connected to VIN. An acceptable range of
enable voltages is given by the enable transfer characteris-
tics. See the Electrical Characteristics section and Enable
Transfer Characteristics figure for more detail. Note, the part
will not operate correctly for VEN > VIN.
COMPONENT SELECTION
A small ceramic (X5R or X7R) capacitor on the input must be
used to ensure stable operation. The value of CIN must be
sized according to the output capacitor value. The value of
CIN must satisfy the relationship CIN ≥ COUT. When no output
capacitor is used, CIN must have a minimum value of 0.1µF.
Noise on the power-supply input may affect the output noise.
Larger input capacitor values (typically 4.7µF to 22µF) may
help reduce noise on the output and significantly reduce
overshoot during startup. Use of an additional optional by-
pass capacitor between the input and ground may help
further reduce noise on the output. With an input capacitor,
the LM4132 will drive any combination of resistance and
capacitance up to VREF/20mA and 10µF respectively.
The LM4132 is designed to operate with or without an output
capacitor and is stable with capacitive loads up to 10µF.
Connecting a capacitor between the output and ground will
significantly improve the load transient response when
switching from a light load to a heavy load. The output
capacitor should not be made arbitrarily large because it will
effect the turn-on time as well as line and load transients.
While a variety of capacitor chemistry types may be used, it
is typically advisable to use low esr ceramic capacitors. Such
capacitors provide a low impedance to high frequency sig-
nals, effectively bypassing them to ground. Bypass capaci-
tors should be mounted close to the part. Mounting bypass
capacitors close to the part will help reduce the parasitic
trace components thereby improving performance.
SHORT CIRCUITED OUTPUT
The LM4132 features indefinite short circuit protection. This
protection limits the output current to 75mA when the output
is shorted to ground.
TURN ON TIME
Turn on time is defined as the time taken for the output
voltage to rise to 90% of the preset value. The turn on time
depends on the load. The turn on time is typically 33.2µs
when driving a 1µF load and 78.8µs when driving a 10µF
load. Some users may experience an extended turn on time
(up to 10ms) under brown out conditions and low tempera-
tures (-40˚C).
THERMAL HYSTERESIS
Thermal hysteresis is the defined as the change in output
voltage at 25oC after some deviation from 25oC. This is to
say that thermal hysteresis is the difference in output voltage
between two points in a given temperature profile. An illus-
trative temperature profile is shown in Figure 1.
20151338
FIGURE 1. Illustrative Temperature Profile
This may be expressed analytically as the following:
Where
VHYS = Thermal hysteresis expressed in ppm
VREF = Nominal preset output voltage
VREF1 = VREF before temperature fluctuation
VREF2 = VREF after temperature fluctuation.
The LM4132 features a low thermal hysteresis of 75 ppm
(typical) from -40˚C to 125˚C after 8 temperature cycles.
TEMPERATURE COEFFICIENT
Temperature drift is defined as the maximum deviation in
output voltage over the operating temperature range. This
deviation over temperature may be illustrated as shown in
Figure 2.
20151339
FIGURE 2. Illustrative VREF vs Temperature Profile
Temperature coefficient may be expressed analytically as
the following:
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM4132.PDF ] | |
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