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NCV4279B 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG
The NCV4279B is a 5.0 V precision micropower voltage regulator. The output current capability is 150 mA. 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 reset threshold voltage can be decreased by the connection of external resistor divider to RADJ lead. 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 * 5.0 V 2.0% Output * Low 90 mA Quiescent Current * Active RESET * Adjustable Reset * 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 * Internally Fused Leads in SO-14 and SO-20L Packages * NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes
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8 8 1 SO-8 D SUFFIX CASE 751 14 14 1 SO-14 D SUFFIX CASE 751A 1 20 20 1 SO-20L DW SUFFIX CASE 751D A WL, L YY, Y WW, W 1 NCV4279B AWLYYWW 1 NCV4279B AWLYWW 4279B ALYW
1 = Assembly Location = Wafer Lot = Year = Work Week 8
PIN CONNECTIONS
SO-8 VIN MON RADJ DELAY SO-14 1 RADJ DELAY GND GND GND NC RESET 1 RADJ DELAY NC GND GND GND GND NC NC RESET 14 MON VIN GND GND GND VOUT FLAG 20 MON VIN NC GND GND GND GND NC VOUT FLAG VOUT FLAG RESET GND
SO-20L
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2003
1
August, 2003 - Rev. 1
Publication Order Number: NCV4279B/D
NCV4279B
VBAT 10 F
VIN
VOUT 10 F RADJ
VDD
NCV4279B
Delay CDELAY MON
RFLG 10 k
RRST 10 k
FLAG GND
RESET
I/O
I/O
Figure 1. Application Diagram
MAXIMUM RATINGS*{
Rating VIN (DC) Peak Transient Voltage (46 V Load Dump @ VIN = 14 V) Operating Voltage VOUT (DC) Voltage Range (RESET, FLAG) Input Voltage Range (MON) ESD Susceptibility (Human Body Model) Junction Temperature, TJ Storage Temperature, TS Package Thermal Resistance, SO-8: Junction-to-Case, RJC Junction-to-Ambient, RJA Package Thermal Resistance, SO-14 (Fused) Minimum Pad Data: Junction-to-Case, RJC Junction-to-Ambient, RJA Junction-to-Pin, RJP (Note 3) Package Thermal Resistance, SO-20L (Fused) Minimum Pad Data: Junction-to-Case, RJC Junction-to-Ambient, RJA Junction-to-Pin, RJP (Note 4) Lead Temperature Soldering: Reflow: (SMD styles only) (Notes 1, 2) Value -15 to 45 60 45 16 -0.3 to 10 -0.3 to 10 2.0 -40 to +150 -55 to 150 45 165 C/W 15 110 33 C/W 12 82 26 240 peak C Unit V V V V V V kV C C C/W
1. 60 second maximum above 183C. 2. -5C/+0C allowable conditions. 3. Measured to pin 9. 4. Measured to pin 12. *The maximum package power dissipation must be observed. During the voltage range which exceeds the maximum tested voltage of VIN, operation is assured, but not specified. Wider limits may apply. Thermal dissipation must be observed closely.
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Microprocessor
NCV4279B
ELECTRICAL CHARACTERISTICS (IOUT = 1.0 mA, -40C TJ 125C; 6.0 V < VIN < 26 V; unless otherwise specified.)
Characteristic Output Stage Output Voltage Dropout Voltage (VIN - VOUT) Load Regulation Line Regulation Quiescent Current, (IQ) Active Mode 9.0 V < VIN < 16 V, 100 mA IOUT 150 mA 6.0 V < VIN < 26 V, 100 mA IOUT 150 mA IOUT = 150 mA IOUT = 100 mA VIN = 14 V, 5.0 mA IOUT 150 mA [VOUT(typ) + 1.0] < VIN < 26 V, IOUT = 1.0 mA IOUT = 100 mA, VIN = 12 V, Delay = 3.0 V, MON = 3.0 V IOUT = 75 mA, VIN = 14 V, Delay = 3.0 V, MON = 3.0 V IOUT 150 mA, VIN = 14 V, Delay = 3.0 V, MON = 3.0 V - VOUT = 0 V (Guaranteed by Design) 4.90 4.85 - - -30 - - - - 151 40 150 5.0 5.0 400 100 5.0 15 90 4.0 12 300 190 180 5.10 5.15 600 150 30 60 125 6.0 19 - - - V V mV mV mV mV mA mA mA mA mA C Test Conditions Min Typ Max Unit
Current Limit Short Circuit Output Current Thermal Shutdown Reset Function (RESET) RESET Threshold HIGH (VRH) LOW (VRL) Output Voltage Low (VRLO) Delay Switching Threshold (VDT) Reset Delay Low Voltage Delay Charge Current Delay Discharge Current Reset Adjust Switching Voltage (VR(ADJ)) FLAG/Monitor Monitor Threshold Hysteresis Input Current Output Saturation Voltage MON = 2.0 V VOUT Increasing VOUT Decreasing
4.55 4.50
4.70 4.60
0.98 x VOUT 0.97 x VOUT 0.4 2.2 0.1 3.5 - 1.39
V V
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 1.23
0.1 1.8 - 2.5 - 1.31
V V V mA mA V
Increasing and Decreasing -
1.10 20 -0.5 -
1.20 50 0.1 0.1
1.31 100 0.5 0.4
V mV mA V
MON = 0 V, IFLAG = 1.0 mA
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NCV4279B
PACKAGE PIN DESCRIPTION
Package Pin Number SO-8 3 4 5 - 6 7 8 1 2 SO-14 1 2 3-5, 10-12 6 7 8 9 13 14 SO-20L 1 2 4-7, 14-17 3, 8, 9, 13, 18 10 11 12 19 20 Pin Symbol RADJ DELAY GND NC RESET FLAG VOUT VIN MON Function Reset Adjust. If not needed connect to ground. Timing capacitor for RESET function. Ground. All GND leads must be connected to Ground. No connection. Active reset (accurate to VOUT 1.0 V) Open collector output from early warning comparator. 2.0%, 150 mA output. Input Voltage. Monitor. Input for early warning comparator. If not needed connect to VOUT.
TYPICAL PERFORMANCE CHARACTERISTICS
5.01 VOUT = 5.0 V VIN = 14 V IOUT = 5.0 mA 5.00 VOUT (V) IQ (mA) 1.2 VIN = 12 V 1.0 0.8 0.6 0.4 0.2 4.98 -40 -25 -10 0 +125C +25C -40C
4.99
5
20 35 50 65 Temperature (C)
80
95 110 125
0
5
10 15 IOUT (mA)
20
25
Figure 2. Output Voltage vs. Temperature
Figure 3. Quiescent Current vs. Output Current
14 VIN = 12 V 12 10 IQ (mA) 8 6 -40C 4 2 0 0 15 30 45 60 75 90 IOUT (mA) 105 120 135 140
7 T = 25C 6 5 IQ (mA) 4 3 2 1 0 6 8 10 12 14 IOUT = 50 mA IOUT = 100 mA
+125C +25C
IOUT = 10 mA 16 18 VIN (V) 20 22 24 26
Figure 4. Quiescent Current vs. Output Current
Figure 5. Quiescent Current vs. Input Voltage
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NCV4279B
TYPICAL PERFORMANCE CHARACTERISTICS
120 T = 25C 100 80 IQ (A) 60 49 20 0 Dropout Voltage (mV) IOUT = 100 mA 450 400 350 300 +125C 250 200 150 100 50 6 8 10 12 14 16 18 VIN (V) 20 22 24 26 0 0 25 50 75 IOUT (mA) 100 125 150 +25C -40C
Figure 6. Quiescent Current vs. Input Voltage
Figure 7. Dropout Voltage vs. Output Current
1000 Unstable Region
1000
Unstable Region
100
CVout = 10 mF CVout = 0.1 mF
100 ESR (W) ESR (W) 10 Stable Region
0.1 10
1
Stable Region
CVout = 10 mF 1 0 10 20 30 40 50 60 70 80 90 100110120130140150 OUTPUT CURRENT (mA)
0.01 0 10 20 30 40 50 60 70 80 90 100 110
OUTPUT CURRENT (mA)
Figure 8. Output Capacitor ESR
Figure 9. Output Stability with Output Capacitor Change
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NCV4279B
VOUT Current Source (Circuit Bias) IBIAS Current Limit Sense
VIN
RADJ VBG RESET
+ + -
IBIAS +- Error Amplifier + - 1.8 V Thermal Protection VBG
3.0 A Delay IBIAS
Bandgap Reference VBG +
VBG
GND
IBIAS FLAG
MON
-
Figure 10. Block Diagram
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NCV4279B
CIRCUIT DESCRIPTION REGULATOR CONTROL FUNCTIONS The NCV4279B contains the microprocessor compatible control function RESET (Figure 11).
DELAY Function
VIN RESET Threshold DELAY Threshold (VDT)
VOUT
DELAY RESET Td Td
Figure 11. Reset and Delay Circuit Wave Forms RESET Function
The reset delay circuit provides a programmable (by external capacitor) delay on the RESET output lead. The DELAY lead provides source current (typically 2.5 mA) to the external DELAY capacitor during the following proceedings: 1. During Power Up (once the regulation threshold has been verified). 2. After a reset event has occurred and the device is back in regulation. The DELAY capacitor is discharged when the regulation (RESET threshold) has been violated. This is a latched incident. The capacitor will fully discharge and wait for the device to regulate before going through the delay time event again.
FLAG/Monitor Function
A RESET signal (low voltage) is generated as the IC powers up until VOUT is within 6.0% of the regulated output voltage, or when VOUT drops out of regulation,and is lower than 8.0% below the regulated output voltage. Hysteresis is included in the function to minimize oscillations. The RESET output is an open collector NPN transistor, controlled by a low voltage detection circuit. The circuit is functionally independent of the rest of the IC thereby guaranteeing that the RESET signal is valid for VOUT as low as 1.0 V.
Adjustable Reset Function
An on-chip comparator is provided to perform an early warning to the microprocessor of a possible reset signal. The reset signal typically turns the microprocessor off instantaneously. This can cause unpredictable results with the microprocessor. The signal received from the FLAG pin will allow the microprocessor time to complete its present task before shutting down. This function is performed by a comparator referenced to the bandgap reference. The actual trip point can be programmed externally using a resistor divider to the input monitor (MON) (Figure 13). The typical threshold is 1.20 V on the MON Pin.
VBAT VIN VOUT NCV4279B MON RADJ Delay FLAG COUT I/O
The reset threshold can be made lower by connecting an external resistor divider to the RADJ lead from the VOUT lead, as displayed in Figure 12. This lead is grounded to select the default value of 4.6 V.
to P and System Power
VCC P
RESET GND
RESET
RADJ
VOUT RRST
NCV4279B
COUT
Figure 13. FLAG/Monitor Function
Delay
RESET
to P and RESET Port
CDELAY
Figure 12. Adjustable RESET
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NCV4279B
APPLICATION NOTES FLAG MONITOR Figure 14 shows the FLAG Monitor waveforms as a result of the circuit depicted in Figure 13. 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
The value for the output capacitor COUT shown in Figure 15 should work for most applications, however it is not necessarily the optimized solution.
VIN CIN* 0.1 mF VOUT
NCV4279B
RESET
RRST
COUT** 10 mF
MON FLAG Monitor Ref. Voltage
*CIN required if regulator is located far from the power supply filter. **COUT required for stability. Capacitor must operate at minimum temperature expected.
Figure 15. Test and Application Circuit Showing Output Compensation
RESET
FLAG
CALCULATING POWER DISSIPATION IN A SINGLE OUTPUT LINEAR REGULATOR The maximum power dissipation for a single output regulator (Figure 16) is:
PD(max) + [VIN(max) * VOUT(min)] IOUT(max)
TWARNING
(1)
) VIN(max)IQ
Figure 14. FLAG Monitor Circuit Waveform
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 * Reset Delay Low Voltage)] Delay Charge Current
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 * 0)] + 23.8 ms 2.5 mA
where: VIN(max) is the maximum input voltage, VOUT(min) is the minimum output voltage, IOUT(max) is the maximum output current for the application, and IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of PD(max) is known, the maximum permissible value of RqJA can be calculated:
T RqJA + 150C * A PD
(2)
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 (-25C to -40C), both the value and ESR of the capacitor will vary considerably. The capacitor manufacturers data sheet usually provides this information.
The value of RqJA can then be compared with those in the package section of the data sheet. Those packages with RqJA's less than the calculated value in equation 2 will keep the die temperature below 150C. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heatsink will be required.
IIN VIN SMART REGULATOR(R) IOUT VOUT
} Control Features
IQ
Figure 16. Single Output Regulator with Key Performance Parameters Labeled
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NCV4279B
HEAT SINKS A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RqJA:
RqJA + RqJC ) RqCS ) RqSA
(3)
where: RqJC = the junction-to-case thermal resistance, RqCS = the case-to-heatsink thermal resistance, and RqSA = the heatsink-to-ambient thermal resistance. RqJC appears in the package section of the data sheet. Like RqJA, it too is a function of package type. RqCS and RqSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers.
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NCV4279B
ORDERING INFORMATION
Device NCV4279BD1 NCV4279BD1R2 NCV4279BD2 NCV4279BD2R2 NCV4279BDW NCV4279BDWR2 SO-20L SO 20L 5.0 50V SO-14 SO 14 SO-8 SO 8 Output Voltage Package Shipping 98 Units/Rail 2500 Tape & Reel 55 Units/Rail 1000 Tape & Reel 37 Units/Rail 1000 Tape & Reel
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NCV4279B
PACKAGE DIMENSIONS
SO-8 D SUFFIX CASE 751-07 ISSUE AA
-X- A
8 5 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751-01 THRU 751-06 ARE OBSOLETE. NEW STANDAARD IS 751-07 MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
B
1 4
S
0.25 (0.010)
M
Y
M
-Y- G C -Z- H D 0.25 (0.010)
M SEATING PLANE
K
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
DIM A B C D G H J K M N S
SO-14 D SUFFIX CASE 751A-03 ISSUE F
-A-
14 8 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION.
-B-
1 7
P 7 PL 0.25 (0.010)
M
B
M
G C
R X 45 _
F
-T-
SEATING PLANE
D 14 PL 0.25 (0.010)
K
M
M
S
J
TB
A
S
DIM A B C D F G J K M P R
MILLIMETERS MIN MAX 8.55 8.75 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50
INCHES MIN MAX 0.337 0.344 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.228 0.244 0.010 0.019
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NCV4279B
PACKAGE DIMENSIONS
SO-20L DW SUFFIX CASE 751D-05 ISSUE F
D
A
11 X 45 _
q
NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 12.65 12.95 7.40 7.60 1.27 BSC 10.05 10.55 0.25 0.75 0.50 0.90 0_ 7_
H
M
B
M
20
10X
0.25
E
1
10
20X
B 0.25
M
B TA
S
B
S
A
SEATING PLANE
h
18X
e
A1
T
C
SMART REGULATOR is a registered trademark of Semiconductor Components Industries, LLC.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Phone: 81-3-5773-3850 ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
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NCV4279B/D

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