LSP2200CALZ datasheet, PDF - EEWORLD Datasheet

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LSP2200CALZ: DescriptionPower Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN; CategoryPower/power management The power supply circuit; File Size111KB，5 Pages; ManufacturerLITEON; Websitehttp://optoelectronics.liteon.com/en-global/Home/index; Lite-On began producing LED lamps in 1975; the company has steadily grown to become one of the world's largest manufacturers of optoelectronics products by providing customers with visible and infrared product solutions. High-volume production of commercial and application-specific products, as well as strong R&D and vertical integration capabilities have proven to be key and differentiating factors in Lite-On's success.

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LSP2200CALZ Overview

Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN

LSP2200CALZ Parametric

Parameter Name	Attribute value
Maker	LITEON
Parts packaging code	SOT-23
package instruction	LSOP,
Contacts	3
Reach Compliance Code	compliant
ECCN code	EAR99
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDSO-G3
length	2.9 mm
Number of channels	1
Number of functions	1
Number of terminals	3
Maximum operating temperature	105 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	LSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, LOW PROFILE
Certification status	Not Qualified
Maximum seat height	1.45 mm
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	1.2 V
Nominal supply voltage (Vsup)	2.5 V
surface mount	YES
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal location	DUAL
width	1.6 mm
Base Number Matches	1

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Liteon Semiconductor Corporation

LSP2200

3 PIN Microprocessor Reset Monitors

FEATURES

Precision VCC Monitor for 2.5 V, 3.0V, 3.3 V, and

5.0 V Supplies

Fully Specified Over Temperature

Available in Three Output Configurations

_____________

Push-Pull

RESET

Output

250ms Typical Power-On Reset Pulse Width

2µA typical Supply Current

Guaranteed Reset Valid to Vcc=+1V

Power Supply Transient Immunity

No External Components

SOT23-3L Packages

GENERAL DESCRIPTION

The LSP2200 is a microprocessor supervisory circuits

used to monitor the power supplies in MPU and digital

systems. They provide excellent circuit reliability and

low cost by eliminating external components and

adjustments when used with +5V, +3.3V, +3.0V, or

+2.5V powered circuits

These curcuits perform a single function: they assert a

reset signal whenever the Vcc supply voltage declines

below a preset threshold, keeping it asserted for at

least 140ms after Vcc has risen above the reset

threshold. Reset thresholds suitable for operation whit

a variety of supply voltages are available. The

LSP2200 have push-pull outputs, an active-low

_____________

RESET

output. The reset comparator is designed to

ignore fast transients on Vcc, and the outputs are

guaranteed to be in the correct logic state for Vcc down

to 1V. Low supply current makes the LSP2200 ideal for

use in portable equipment. The LSP2200 is available in

SOT23-3L package.

APPLICATIONS

Computers

Controllers

Intelligent Instruments

Critical MPU and MPU Power Monitoring

Portable/Battery-Powered Equipment

Automotive

PIN CONFIGURATION

(Top View)

GND 1

RESET 2

VCC

Name

GND

_____________

Function

Ground reference

Active-low output.

RESET

remains low while VCC is below the reset threshold,

and for a reset timeout period after VCC rises above the reset threshold.

Supply voltage (typ.)

____________

RESET

VCC

TYPICAL OPERATION CIRCUIT

1/5

Rev1.1

Liteon Semiconductor Corporation

LSP2200

3 PIN Microprocessor Reset Monitors

low)

_____________

Vcc＞1.0V, I

SINK

=50µA

0.9Vc

Vcc-1

0.1

Vcc＞V

max, I

SOURCE

=500µA

LSP2200-2.32/2.63/2.93/3.08

Voltage High

(push-pull active

Vcc＞V

max, I

SOURCE

=80µA

low)

LSP2200-4.00/4.38/4.63

Typical Values: TA=-+25°C Vcc=5V for LSP2200-4.00/4.38/4.63

Vcc=3.3V for LSP2200-3.08/2.93

Vcc=3V for LSP2200-2.63

Vcc=2.5V for LSP2200-2.32

RESET

Output

DETAILED DESCRIPTION

A microprocessor's (MPU) reset input starts the MPU in a known state. The LSP2200 reset to prevent code execution

errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the Vcc supply

voltage declines below a preset threshold, keeping it asserted for at least 250ms after Vcc has risen above the reset

threshold. The LSP2200 push-pull output stage.

APPLICATION INFORMATION

Reset Timing Diagram:

Figure1

When operating properly with 5V in (for example), VOUT will also be about 5V. When VIN starts to fall, VOUT will

follow it down as shown. When VIN drops below VTH, VOUT drops to ground and stays there unless VIN also falls

below its minimum operating voltage, approx. 1V. At this point, the supervisor loses control, and its output may rise,

only to again follow VIN down to the ground.

When VIN begins to rise, VOUT follows it until 1.0V or so is reached, whereupon the device regains control, VOUT is

pulled to ground, etc. When VIN rises above VTH, VOUT comes out of RESET 140ms later.

If it is required that a lower value than GND + 1.0V is needed on RESET signal during VCC

≤

1V, a 100K resistor may

be used on the device output to GND (Figure 3).

Negative-Going V

Transients

In addition to issuing a reset to the MPU during power-up, power-down, and brownout conditions, the LSP2200 is

relatively immune to short-duration negative-going Vcc transients (glitches). Figure2 shows typical transient duration

vs. reset comparator overdrive, for which the LSP2200 do not generate a reset pulse. The graph was generated

using a negative going pulse applied to Vcc, starting 0.5V above the actual reset threshold and ending below it by the

magnitude in dicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative-going

Vcc transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther

below the reset threshold), the maximum allowable pulse width decreases. Typically, for the LSP2200-4.63/4.38, a

Vcc transient that goes 100mV below the reset threshold and lasts 20µs or less will not cause a reset pulse. A 0.1µF

bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity.

3/5

Rev1.1

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