LM3703XBBPX-308 [TI]

1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA9, MICRO, SMD-9;


型号：	LM3703XBBPX-308
厂家：	TEXAS INSTRUMENTS
描述：	1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA9, MICRO, SMD-9 输入元件
文件：	总13页 (文件大小：221K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

September 2003

LM3702/LM3703

Microprocessor Supervisory Circuits with Low Line

Output and Manual Reset

n No external components required

n Manual-Reset input

The LM3702/LM3703 series of microprocessor supervisory

n RESET (LM3702) or RESET (LM3703) outputs

General Description

circuits provide the maximum flexibility for monitoring power

supplies and battery controlled functions in systems without

backup batteries. The LM3702/LM3703 series are available

in a 9-bump micro SMD package.

n Precision supply voltage monitor

n Factory programmable Reset Timeout Delay

n Available in micro SMD package for minimum footprint

0.5% Reset threshold accuracy at room temperature

2% Reset threshold accuracy over temperature

extremes

Built-in features include the following:

Reset: Reset is asserted during power-up, power-down, and

brownout conditions. RESET is guaranteed down to V_CCof

1.0V.

n Reset assertion down to 1V V_CC(RESET option only)

n 28 µA V_CCsupply current

Manual Reset Input: An input that asserts reset when pulled

low.

Applications

Low Line Output: This early power failure warning indicator

goes low when the supply voltage drops to a value which is

2% higher than the reset threshold voltage.

n Embedded Controllers and Processors

n Intelligent Instruments

n Automotive Systems

Features

n Critical µP Power Monitoring

n Standard Reset Threshold voltage: 3.08V

n Custom Reset Threshold voltages: For other voltages

between 2.2V and 5.0V in 10mV increments, contact

National Semiconductor Corp.

Typical Application

20011503

DS200115

www.national.com

Connection Diagram

Top View

(looking from the coating side)

micro SMD 9 Bump Package

BPA09

20011501

Pin Descriptions

Bump No.

Name

Function

Manual-Reset input. When MR is less than V_MRT(Manual Reset Threshold)

RESET/RESET is engaged.

V_CC

Power Supply input.

RESET

Reset Logic Output. Pulses low for t_RP(Reset Timeout Period) when triggered, and stays

low whenever V_CCis below the reset threshold or when MR is below V_MRT. It remains low

for t_RPafter either V_CCrises above the reset threshold, or after MR input rises above

V_MRT(LM3702 only).

RESET

LLO

Reset Logic Output. RESET is the inverse of RESET (LM3703 only).

Low-Line Logic Output. Early Power-Fail warning output. Low when V_CCfalls below V_LLOT

(Low-Line Output Threshold). This output can be used to generate an NMI (Non-Maskable

Interrupt) to provide an early warning of imminent power-failure.

Ground reference for all signals.

A2, A3, C2

GND

No Connect.

No Connect. Test input used at factory only. Leave floating.

www.national.com

Block Diagram

20011505

www.national.com

Ordering Information

20011504

*For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office.

LM3702/LM3703

Reset

Timeout

Period

200ms

1600ms

1.4ms

Package

Marking

Part Number

Output

LM3702XCBP-308

LM3702XCBPX-308

LM3703XCBP-308

LM3703XCBPX-308

LM3703XDBP-308

LM3703XDBPX-308

LM3702YABP-308

LM3702ABPX-308

LM3702YDBP-220

totem-pole

open-drain

%%I2

%%I3

%%124

%%131

%%125

1.4ms

1600ms

LM3702YDBPX-220

%% is the datecode and will vary with time.

Table Of Functions

Part

Number

Active

Low

Reset

Active

High

Reset

Output

(X = totem-pole)

(Y = open-drain)

Reset

Timeout

Period

Manual

Reset

Low

Line

Output

LM3702

LM3703

X, Y*

Customized

* = available upon request. Contact National

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Power Dissipation

(Note 3)

Operating Ratings (Note 1)

Temperature Range

−40˚C ≤ T_J≤ 85˚C

Supply Voltage (V_CC

)

−0.3V to 6.0V

All Other Inputs

−0.3V to V_CC+ 0.3V

ESD Ratings (Note 2)

Human Body Model

Machine Model

1.5kV

150V

LM3702/LM3703 Series Electrical Characteristics

Limits in the standard typeface are for T_J= 25˚C and limits in boldface type apply over full operating range. Unless otherwise

specified: V_CC= +2.2V to 5.5V.

Symbol

POWER SUPPLY

V_CCOperating Voltage

Parameter

Conditions

Min

Typ

Max

Units

LM3702

LM3703

1.0

1.2

5.5

Range: V_CC

I_CC

V_CCSupply

Current

All inputs = V_CC; all outputs floating

µA

RESET THRESHOLD

V_RST

Reset Threshold

V_CCfalling

−0.5

−2

+0.5

V_RST

V_CCfalling: T_A= 0˚C to 70˚C

−1.5

+1.5

V_RSTH

t_RP

Reset Threshold

Hysteresis

0.0032•V_RST

Reset Timeout

Period

Reset Timeout Period = A

Reset Timeout Period = B

Reset Timeout Period = C

Reset Timeout Period = D

V_CCfalling at 1mV/µs

140

1120

1.4

280

2240

µs

200

1600

t_RD

V_CCto Reset

Delay

RESET (LM3703)

V_OLRESET

V_CC2.25V, I_SINK= 900µA

0.3

0.4

V_CC2.7V, I_SINK= 1.2mA

V_CC4.5V, I_SINK= 3.2mA

V_OH

RESET

V_CC1.2V, I_SOURCE= 50µA

0.8 V_CC

V_CC1.8V, I_SOURCE= 150µA

V_CC2.25V, I_SOURCE= 300µA

0.8 V_CC

V_CC2.7V, I_SOURCE= 500µA

0.8 V_CC

V_CC4.5V, I_SOURCE= 800µA

V_CC− 1.5V

I_LKG

Output Leakage

Current

V_RESET= 5.5V

1.0

µA

RESET (LM3702)

V_OLRESET

V_CC1.0V, I_SINK= 50µA

0.3

0.4

V_CC1.2V, I_SINK= 100µA

V_CC2.25V, I_SINK= 900µA

V_CC2.7V, I_SINK= 1.2mA

V_CC4.5V, I_SINK= 3.2mA

V_OH

RESET

V_CC2.25V, I_SOURCE= 300µA

0.8 V_CC

V_CC2.7V, I_SOURCE= 500µA

V_CC4.5V, I_SOURCE= 800µA

V_CC− 1.5V

www.national.com

LM3702/LM3703 Series Electrical Characteristics (Continued)

Limits in the standard typeface are for T_J= 25˚C and limits in boldface type apply over full operating range. Unless otherwise

specified: V_CC= +2.2V to 5.5V.

Symbol

Parameter

Conditions

Min

2.0

Typ

Max

0.8

Units

V_MRT

V_MRTH

R_MR

t_MD

MR Input

MR, Low

MR, High

Threshold

MR Threshold

Hysteresis

MR falling: V_CC= V_{RST MAX}to 5.5V

0.0032•V_RST

MR Pull-up

Resistance

MR to Reset

Delay

kΩ

µS

t_MR

MR Pulse Width

LLO

V_OL

LLO Output

Voltage

V_CC2.25V, I_SINK= 900µA

0.3

0.4

V_CC2.7V, I_SINK= 1.2mA

V_CC4.5V, I_SINK= 3.2mA

V_OH

V_CC2.25V, I_SOURCE= 300µA

0.8 V_CC

V_CC2.7V, I_SOURCE= 500µA

V_CC4.5V, I_SOURCE= 800µA

V_CC− 1.5V

LLO OUTPUT

V_LLOT

LLO Output

1.01•V_RST

1.02•V_RST

1.03•V_RST

Threshold

(V_LLO− V_RST, V_CC

falling)

V_LLOTH

Low-Line

0.0032•V_RST

µs

Comparator

Hysteresis

t_CD

Low-Line

V_CCfalling at 1mV/µs

Comparator Delay

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device

is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the

listed conditions.

Note 2: The Human Body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200pF capacitor discharged

directly into each pin.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T (MAX), the junction-to-ambient thermal resistance, θ

J-A

and the ambient temperature, T . The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of θ

for the micro SMD package is 220˚C/W.

J-A

www.national.com

Typical Performance Characteristics

Supply Current vs Supply Voltage

3.3V Supply Current vs Temperature

20011511

20011515

Normalized Reset Threshold Voltage vs Temperature

Reset Timeout Period vs V_CC

20011512

20011532

Max. Transient Duration vs Reset Comparator Overdrive

(V_CC= 3.3V)

Reset Timeout Period vs Temperature

20011510

20011516

www.national.com

Typical Performance Characteristics (Continued)

Low-Line Comparator Propagation Delay vs Temperature

20011514

www.national.com

timeout period expires after MR rises above V_MRT. Use MR

with digital logic to assert or to daisy chain supervisory

circuits. It may be used as another low-line comparator by

adding a buffer.

Circuit Information

RESET OUTPUT

The Reset input of a µP initializes the device into a known

state. The LM3702/LM3703 microprocessor supervisory cir-

cuits assert a forced reset output to prevent code execution

errors during power-up, power-down, and brownout condi-

tions.

LOW-LINE OUTPUT (LLO)

The low-line output comparator is typically used to provide a

non-maskable interrupt to a µP when V_CCbegins falling. LLO

monitors V_CCand goes low when V_CCfalls below V_LLOT

RESET is guaranteed valid for V_CC

1V. Once V_CCex-

(typically 1.02 • V_RST) with hysteresis of 0.0032 • V_RST

ceeds the reset threshold, an internal timer maintains the

output for the reset timeout period. After this interval, reset

goes high. The LM3702 offers an active-low RESET; The

LM3703 offers an active-high RESET.

SPECIAL PRECAUTIONS FOR THE MICRO SMD

PACKAGE

As with most integrated circuits, the LM3702 and LM3703

are sensitive to exposure from visible and infrared (IR) light

radiation. Unlike a plastic encapsulated IC, the micro SMD

package has very limited shielding from light, and some

sensitivity to light reflected from the surface of the PC board

or long wavelength IR entering the die from the side may be

experienced. This light could have an unpredictable affect on

the electrical performance of the IC. Care should be taken to

shield the device from direct exposure to bright visible or IR

light during operation.

Any time V_CCdrops below the reset threshold (such as

during a brownout), the reset activates. When V_CCagain

rises above the reset threshold, the internal timer starts.

Reset holds until V_CCexceeds the reset threshold for longer

than the reset timeout period. After this time, reset releases.

The Manual Reset input (MR) will initiate a forced reset also.

See the Manual Reset Input section.

RESET THRESHOLD

The LM3702/LM3703 family is available with a reset voltage

of 3.08V. Other reset thresholds in the 2.20V to 5.0V range,

in steps of 10 mV, are available; contact National Semicon-

ductor for details.

MICRO SMD MOUNTING

The micro SMD package requires specific mounting tech-

niques which are detailed in National Semiconductor Appli-

cation Note AN-1112. Referring to the section Surface

Mount Technology (SMT) Assembly Considerations, it

should be noted that the pad style which must be used with

the 9-pin package is the NSMD (non-solder mask defined)

type.

MANUAL RESET INPUT (MR)

Many µP-based products require a manual reset capability,

allowing the operator to initiate a reset. The MR input is fully

debounced and provides an internal 56 kΩ pull-up. When the

MR input is pulled below V_MRT(1.225V) for more than 25 µs,

reset is asserted after a typical delay of 12 µs. Reset remains

active as long as MR is held low, and releases after the reset

For best results during assembly, alignment ordinals on the

PC board may be used to facilitate placement of the micro

SMD device.

www.national.com

Timing Diagrams

20011528

FIGURE 1. LM3702 Reset Time with MR

20011529

FIGURE 2. LLO Output

www.national.com

Typical Application Circuits

20011524

FIGURE 3. LM3703 Power-On Delay

www.national.com

Typical Application Circuits (Continued)

20011522

FIGURE 4. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear Regulator

20011531

FIGURE 5. Switch Debouncer

www.national.com

Physical Dimensions inches (millimeters)

unless otherwise noted

NOTES: UNLESS OTHERWISE SPECIFIED

1. EPOXY COATING

2. 63Sn/37Pb EUTECTIC BUMP

3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.

4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER

CLOCKWISE.

5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS

PACKAGE HEIGHT.

6.NO JEDEC REGISTRATION AS OF AUG.1999.

9 bump micro SMD Package

NS Package Number BPA09FFB

The dimensions of X1, X2 and X3 are given below

X1 = 1.412mm

X2 = 1.412mm

X3 = 0.850mm

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

Americas Customer

Support Center

National Semiconductor

Europe Customer Support Center

Fax: +49 (0) 180-530 85 86

National Semiconductor

Asia Pacific Customer

Support Center

National Semiconductor

Japan Customer Support Center

Fax: 81-3-5639-7507

Email: new.feedback@nsc.com

Tel: 1-800-272-9959

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

Email: ap.support@nsc.com

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

www.national.com

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

LM3703XBBPX-308 [TI]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E