LP3470 - Tiny Power On Reset Circuit

	LP3470 - Tiny Power On Reset Circuit

Datasheet	Packaging	Samples & Pricing	Reliability	Knowledge Base

Features

•	Tiny SOT23-5 Package
•	Open Drain Reset# Output
•	Programmable Reset Timeout Period Using an External Capacitor
•	Immune to Short V_CC Transients

Key Specification

•	±1% Reset Threshold Accuracy Over Temperature
•	Standard Reset Threshold Voltages: 2.63V, 2.93V, 3.08V, 3.65V, 4.00V, 4.38V, and 4.63V
•	Custom Reset Threshold Voltages: For other voltages between 2.4V and 5.0V contact your National Semiconductor representative
•	Very Low Quiescent Current (16 µA typical)
•	Guaranteed Reset# valid down to V_CC=0.5V

General Description

The LP3470 is a micropower CMOS voltage supervisory circuit designed to monitor power supplies in microprocessor (µP) and other digital systems. More...

Applications

•	Critical µP and µC Power Monitoring
•	Intelligent Instruments
•	Computers
•	Portable/Battery-Powered Equipments

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

Power on Reset Yes

Watchdog No

Power Fail Input No

Manual Reset No

Reset Timeout Period 1 ms

Power on Reset Yes

Watchdog No

Power Fail Input No

Manual Reset No

Reset Timeout Period 1 ms

On/Off Pin No

Error Flag Yes

Input Min Voltage 0.5 Volt

Input Max Voltage 5 Volt

RegType Supervisor

Temperature Min -20 deg C

Temperature Max 85 deg C

View Using Catalog

Typical Performance

click for larger image

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LP3470 Tiny Power On Reset Circuit	559 Kbytes	18-Nov-04	View Online Download
LP3470 Tiny Power On Reset Circuit (Japanese)	104 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LP3470M5-2.75

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
1000

16 weeks

N/A

LP3470M5-2.83

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
1000

16 weeks

N/A

LP3470M5-3.65

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
1000

16 weeks

N/A

LP3470M5-4.00

5

NOPB

1

260

Lifetime buy

N/A

1K+

$0.56

reel
of
1000

8 weeks

2000

LP3470IM5-2.63

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

8 weeks

2500

LP3470IM5-2.75

5

NOPB

1

260

Full production

N/A

1K+

$0.61

reel
of
1000

8 weeks

50

LP3470IM5-2.83

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

8 weeks

25000

LP3470IM5-2.93

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

6 weeks

2000

LP3470IM5-3.08

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

6 weeks

2000

LP3470IM5-3.65

5

NOPB

1

260

Full production

N/A

1K+

$0.61

reel
of
1000

6 weeks

2000

LP3470IM5-4.00

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

6 weeks

2000

LP3470IM5-4.38

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

8 weeks

2000

LP3470IM5-4.63

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.61

reel
of
1000

8 weeks

5000

LP3470IM5-4.8

5

NOPB

1

260

Full production

N/A

1K+

$0.61

reel
of
1000

8 weeks

N/A

LP3470M5-2.63

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.56

reel
of
1000

8 weeks

2000

LP3470M5-2.93

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.56

reel
of
1000

8 weeks

2000

LP3470M5-3.08

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.56

reel
of
1000

8 weeks

2000

LP3470M5-4.38

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.56

reel
of
1000

6 weeks

5000

LP3470M5-4.63

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.56

reel
of
1000

6 weeks

2000

LP3470IM5X-2.75

5

NOPB

1

260

N/A

1K+

$0.61

reel
of
3000

16 weeks

N/A

LP3470IM5X-4.8

5

NOPB

1

260

N/A

1K+

$0.61

reel
of
3000

16 weeks

N/A

LP3470M5X-2.75

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
3000

16 weeks

N/A

LP3470M5X-2.83

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
3000

16 weeks

N/A

LP3470M5X-3.65

5

NOPB

1

260

N/A

1K+

$0.56

reel
of
3000

16 weeks

N/A

LP3470IM5X-2.83

5

NOPB

1

260

Lifetime buy

N/A

1K+

$0.61

reel
of
3000

8 weeks

N/A

LP3470IM5X-3.65

5

NOPB

1

260

Lifetime buy

N/A

1K+

$0.61

reel
of
3000

8 weeks

5000

LP3470IM5X-4.38

5

STD

NOPB

1

1

260

260

Lifetime buy

N/A

1K+

$0.61

reel
of
3000

8 weeks

7500

LP3470M5X-2.63

5

NOPB

1

260

Lifetime buy

N/A

1K+

$0.56

reel
of
3000

8 weeks

5000

LP3470M5X-4.38

5

NOPB

1

260

Lifetime buy

N/A

1K+

$0.56

reel
of
3000

8 weeks

N/A

LP3470IM5X-2.63

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.61

reel
of
3000

8 weeks

10000

LP3470IM5X-2.93

5

NOPB

1

260

Full production

N/A

1K+

$0.61

reel
of
3000

8 weeks

5000

LP3470IM5X-3.08

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.61

reel
of
3000

8 weeks

7500

LP3470IM5X-4.00

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.61

reel
of
3000

8 weeks

7500

LP3470IM5X-4.63

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.61

reel
of
3000

6 weeks

10000

LP3470M5X-2.93

5

NOPB

1

260

Full production

N/A

1K+

$0.56

reel
of
3000

8 weeks

5000

LP3470M5X-3.08

5

NOPB

1

260

Full production

N/A

1K+

$0.56

reel
of
3000

8 weeks

15000

LP3470M5X-4.00

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.56

reel
of
3000

8 weeks

7500

LP3470M5X-4.63

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.56

reel
of
3000

6 weeks

25000

Obsolete Parts

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3470IM5X-2.83	LP3470IM5-2.83	National Semiconductor	12/01/2009
LP3470IM5X-3.65	LP3470IM5-3.65	National Semiconductor	12/01/2009
LP3470IM5X-4.38	LP3470IM5-4.38	National Semiconductor	12/01/2009
LP3470M5-4.00	LP3470IM5-4.00	National Semiconductor	12/01/2009
LP3470M5X-2.63	LP3470IM5-2.63	National Semiconductor	12/01/2009
LP3470M5X-4.38	LP3470IM5-4.38	National Semiconductor	12/01/2009

General Description

The LP3470 is a micropower CMOS voltage supervisory circuit designed to monitor power supplies in microprocessor (µP) and other digital systems. It provides maximum adjustability for power-on-reset (POR) and supervisory functions. It is available in the following six standard reset threshold voltage (V_RTH) options: 2.63V, 2.93V, 3.08V, 3.65V, 4.00V, 4.38V, and 4.63V. If other voltage options between 2.4V and 5.0V are desired please contact your National Semiconductor representative.

The LP3470 asserts a reset signal whenever the V_CC supply voltage falls below a reset threshold. The reset time-out period is adjustable using an external capacitor. Reset remains asserted for an interval (programmed by an external capacitor) after V_CC has risen above the threshold voltage.

The device is available in the tiny SOT23-5 package.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM *	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP3470IM5-2.63	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-2.75	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-2.83	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-2.93	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-3.08	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-3.65	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-4.00	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-4.38	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-4.63	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5-4.8	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-2.63	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-2.75	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-2.83	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-2.93	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-3.08	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-3.65	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-4.00	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-4.38	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-4.63	CS100	1	12726	39	0	673000	6	190965587
LP3470IM5X-4.8	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-2.63	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-2.75	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-2.83	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-2.93	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-3.08	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-3.65	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-4.00	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-4.38	CS100	1	12726	39	0	673000	6	190965587
LP3470M5-4.63	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-2.63	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-2.75	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-2.83	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-2.93	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-3.08	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-3.65	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-4.00	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-4.38	CS100	1	12726	39	0	673000	6	190965587
LP3470M5X-4.63	CS100	1	12726	39	0	673000	6	190965587

Note: The Early Failure Rates were calculated as point estimates. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date
AN-1144: Application Note 1144 Maximizing Start-Up Loads with the LM3352 Regulated Buck/Boost Switched Capacitor Converter	62 Kbytes	25-Sep-02	Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 6-Jan-2009]