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PDF NCV8501 Data sheet ( Hoja de datos )
| Número de pieza | NCV8501 | |
| Descripción | Micropower 150 mA LDO Linear Regulators with ENABLE / DELAY / RESET / and Monitor FLAG | |
| Fabricantes | ON | |
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NCV8501 Series
Micropower 150 mA LDO
Linear Regulators
with ENABLE, DELAY,
RESET, and Monitor FLAG
The NCV8501 is a family of precision micropower voltage
regulators. Their output current capability is 150 mA. The family has
output voltage options for adjustable, 2.5 V, 3.3 V, 5.0 V, 8.0 V, and 10 V.
The output voltage is accurate within ±2.0% with a maximum
dropout voltage of 0.6 V at 150 mA. Low quiescent current is a feature
drawing only 90 mA with a 100 mA load. This part is ideal for any and
all battery operated microprocessor equipment.
Microprocessor control logic includes an active RESET (with
DELAY), and a FLAG monitor which can be used to provide an early
warning signal to the microprocessor of a potential impending RESET
signal. The use of the FLAG monitor allows the microprocessor to
finish any signal processing before the RESET shuts the
microprocessor down.
The active RESET circuit operates correctly at an output voltage as
low as 1.0 V. The RESET function is activated during the power up
sequence or during normal operation if the output voltage drops
outside the regulation limits.
The regulator is protected against reverse battery, short circuit, and
thermal overload conditions. The device can withstand load dump
transients making it suitable for use in automotive environments. The
device has also been optimized for EMC conditions.
Features
• Output Voltage Options: Adjustable, 2.5 V, 3.3 V, 5.0 V, 8.0 V, 10 V
• ±2.0% Output
• Low 90 mA Quiescent Current
• Fixed or Adjustable Output Voltage
• Active RESET
• ENABLE
• 150 mA Output Current Capability
• Fault Protection
♦ +60 V Peak Transient Voltage
♦ −15 V Reverse Voltage
♦ Short Circuit
♦ Thermal Overload
• Early Warning through FLAG/MON Leads
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
• Pb−Free Packages are Available
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8
1
SO−8
D SUFFIX
CASE 751
16
1
SOIC 16 LEAD
WIDE BODY
EXPOSED PAD
PDW SUFFIX
CASE 751R
MARKING DIAGRAMS
SO−8
8
8501x
ALYW
1
SOW−16
E PAD
16
8501x
AWLYYWW
1
x = Voltage Ratings as Indicated Below:
A = Adjustable
2 = 2.5 V
3 = 3.3 V
5 = 5.0 V
8 = 8.0 V
1 = 10 V
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
September, 2004 − Rev. 19
1
Publication Order Number:
NCV8501/D
1 page  
NCV8501 Series
ELECTRICAL CHARACTERISTICS (IOUT = 1.0 mA, ENABLE = 5.0 V, −40°C ≤ TJ ≤ 125°C; VIN dependent on voltage option
(Note 4); unless otherwise specified.)
Characteristic
Test Conditions
Min Typ Max Unit
Reset Function (RESET)
RESET Threshold for 8.0 V Option
HIGH (VRH)
LOW (VRL)
VOUT Increasing
VOUT Decreasing
6.86
6.80
RESET Threshold for 10 V Option
HIGH (VRH)
LOW (VRL)
VOUT Increasing
VOUT Decreasing
8.60
8.50
Output Voltage
Low (VRLO)
DELAY Switching Threshold (VDT)
DELAY Low Voltage
DELAY Charge Current
DELAY Discharge Current
FLAG/Monitor
1.0 V ≤ VOUT ≤ VRL, RRESET = 10 k
−
VOUT < RESET Threshold Low(min)
DELAY = 1.0 V, VOUT > VRH
DELAY = 1.0 V, VOUT = 1.5 V
−
1.4
−
1.5
5.0
Monitor Threshold
Increasing and Decreasing
Hysteresis
−
Input Current
MON = 2.0 V
Output Saturation Voltage
MON = 0 V, IFLAG = 1.0 mA
Voltage Adjust (Adjustable Output only)
1.10
20
−0.5
−
Input Current
ENABLE
VADJ = 1.28 V
−0.5
Input Threshold
Input Current
Low
High
ENABLE = 5.0 V
−
3.0
−
4. Voltage range specified in the Output Stage of the Electrical Characteristics in boldface type.
5. For VIN ≤ 5.5 V, a RESET = Low may occur with the output in regulation.
7.52
7.36
9.40
9.20
0.1
1.8
−
2.5
−
0.98 ×
VOUT
0.97 ×
VOUT
0.98 ×
VOUT
0.97 ×
VOUT
0.4
2.2
0.1
3.5
−
V
V
V
V
V
V
V
mA
mA
1.20 1.31
V
50 100 mV
0.1 0.5 mA
0.1 0.4 V
− 0.5 mA
− 0.5 V
− −V
1.0 5.0 mA
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5
5 Page 
NCV8501 Series
APPLICATION NOTES
NCV8501
VIN VOUT
VADJ
MJD31C
>1 Amp 5.0 V
VIN
CIN*
0.1 mF
VOUT
NCV8501
RESET
RRST
COUT**
10 mF
VBAT C2
0.1 mF
R1
294 k
R2
100 k
C1
47 mF
Figure 17. Additional Output Current
Adding Capability
Figure 17 shows how the adjustable version of parts can
be used with an external pass transistor for additional current
capability. The setup as shown will provide greater than 1
Amp of output current.
FLAG MONITOR
Figure 18 shows the FLAG Monitor waveforms as a result
of the circuit depicted in Figure 15. As the output voltage
falls (VOUT), the Monitor threshold is crossed. This causes
the voltage on the FLAG output to go low sending a warning
signal to the microprocessor that a RESET signal may occur
in a short period of time. TWARNING is the time the
microprocessor has to complete the function it is currently
working on and get ready for the RESET shutdown signal.
VOUT
MON
FLAG Monitor
Ref. Voltage
RESET
FLAG
*CIN required if regulator is located far from the power supply filter
**COUT required for stability. Capacitor must operate at minimum
temperature expected
Figure 19. Test and Application Circuit Showing
Output Compensation
SETTING THE DELAY TIME
The delay time is controlled by the Reset Delay Low
Voltage, Delay Switching Threshold, and the Delay Charge
Current. The delay follows the equation:
tDELAY
+
[CDELAY(Vdt *
Delay
Reset Delay Low
Charge Current
Voltage)]
Example:
Using CDELAY = 33 nF.
Assume reset Delay Low Voltage = 0.
Use the typical value for Vdt = 1.8 V.
Use the typical value for Delay Charge Current = 2.5 mA.
tDELAY
+
[33
nF(1.8 *
2.5 mA
0)]
+
23.8
ms
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start−up
delay, load transient response and loop stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (−25°C to −40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
The value for the output capacitor COUT shown in Figure 19
should work for most applications, however it is not
necessarily the optimized solution.
TWARNING
Figure 18. FLAG Monitor Circuit Waveform
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11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NCV8501.PDF ] | |
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