Richtek RT9818A-13PY, RT9818A-14PV, RT9818A-15PV, RT9818A-16PV, RT9818A-18GV Schematic [ru]

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Micro-Power Voltage Detectors

RT9818

General Description

The RT9818 is a micro-power voltage detector supervising

the power supply voltage level for microprocessors (μP)

or digital systems. It provides internally fixed threshold

levels with 0.1V per step ranging from 1.2V to 5V, which

covers most digital applications. It features low supply

current of 3μA. The RT9818 performs supervisory function

by sending out a reset signal whenever the V

falls below a preset threshold level. This reset signal will

last the whole period before VDD recovering. Once V

recovered upcrossing the threshold level, the reset signal

will be released after a certain delay time. RT9818 is

provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and

voltage

Features

Internally Fixed Threshold 1.2V to 5V in 0.1V Step

z High Accuracy

z Low Supply Current 3

z No External Components Required

z Quick Reset within 20

z Built-in Recovery Delay Include 0ms, 55ms, 220ms,

450ms Options

z Low Functional Supply Voltage 0.9V

z N-Channel Open-Drain Output

z Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89

Packages

z RoHS Compliant and 100% Lead (Pb)-Free

±±

±1.5%

±±

μμ

μA

μμ

μs

μμ

SOT-89 packages.

Applications

Ordering Information

RT9818

Note :

Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

DS9818-10 May 2013 www.richtek.com

Package Type U3 : SC-70-3 V : SOT-23-3 VL : SOT-23-3 (L-Type) B : SOT-23-5 X : SOT-89 Y : SC-82 YR : SC-82 (R-Type)

Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Threshold Voltage 12 : 1.2V 13 : 1.3V : 49 : 4.9V 50 : 5.0V

Reset Active Timeout Period A = 0ms

(RESET)

B = 55ms (RESET) C = 220ms (RESET) D = 450ms (RESET) E = 0ms (RESET) F = 55ms (RESET) G = 220ms (RESET) H = 450ms (RESET)

z Computers

z Controllers

z Intelligent Instruments

z Critical μP and μC Power Monitoring

z Portable/Battery-Powered Equipment

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

Typical Application Circuit

100k

Pull Up

VDD

μP

RESET/

RESET

RT9818

GND

VDD

RESET/ RESET

RT9818

Pin Configurations

GND

RESET/

RESET

VDD

RESET/

RESET

GND

SOT-23-3

Functional Pin Description

Pin Name Pin Function

GND Ground

RESET Active Low Open-Drain Reset Output

RESET Active High Open-Drain Reset Output

VDD

SC-82

VDD

GND

SOT-23-3 (L-Type)

RESET/

RESET

(TOP VIEW)

RESET/

RESET

VDD

SC-82 (R-Type)

GND

RESET/

RESET

GND

VDD

GND

SC-70-3

VDD

RESET/

RESET

RESET/

RESET

231

GNDVDD

SOT-89SOT-23-5

VDD Power Pin

Function Block Diagram

Threshold

Voltage Setting

Timing Diagram

VSET

VDD

CMP

POR

Power On Reset

Timer

RESET/

RESET

N MOS

GND

RESET

Delay Time (0, 55, 220, 450ms)

RESET

Delay Time (0, 55, 220, 450ms)

DS9818-10 May 2013www.richtek.com

RT9818

Absolute Maximum Ratings (Note 1)

z Terminal Voltage (with Respect to GND)

VDD--------------------------------------------------------------------------------------------------------------------- −0.3V to 6V

z All Other Inputs ----------------------------------------------------------------------------------------------------- −0.3V to (V

z Input Current, I

z Power Dissipation, P

-------------------------------------------------------------------------------------------------- 20mA

VDD

@ TA = 25°C

SC-70 / SC-82------------------------------------------------------------------------------------------------------- 0.25W

SOT-23-3 ------------------------------------------------------------------------------------------------------------- 0.4W

SOT-23-5 ------------------------------------------------------------------------------------------------------------- 0.4W

SOT-89---------------------------------------------------------------------------------------------------------------- 0.55W

z Package Thermal Resistance (Note 2)

SC-70 / SC-82, θJA------------------------------------------------------------------------------------------------- 400°C/W

SOT-23-3, θJA-------------------------------------------------------------------------------------------------------- 250°C/W

SOT-23-5, θJA-------------------------------------------------------------------------------------------------------- 250°C/W

SOT-89, θJA---------------------------------------------------------------------------------------------------------- 180°C/W

z Lead Temperature (Soldering, 10sec.)------------------------------------------------------------------------- 260°C

z Storage Temperature Range ------------------------------------------------------------------------------------- −65°C to 150°C

z ESD Susceptibility (Note 3)

HBM (Human Body Model)--------------------------------------------------------------------------------------- 2kV

+ 0.3V)

Recommended Operating Conditions (Note 4)

z Junction Temperature Range ------------------------------------------------------------------------------------- −40°C to 125°C

z Ambient Temperature Range ------------------------------------------------------------------------------------- −40°C to 85°C

Electrical Characteristics

(VDD = 3V, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Operating VDD (V

Supply Current IDD V

Reset Threshold VTH T

Threshold Voltage Accuracy ΔVTH T

VDD Drop to Reset Delay tRD Drop = VTH −125mV -- 20 -- μs

Reset Active Time Out Period

RESET Output Voltage Low (Note 5)

Hysteresis Width V

) Range VDD 0.9 -- 6 V

OUT

= 3V, VDD = 4.5V, TA = 27°C -- 3 8 μA

= 27°C -- 1.2 to 5 -- V

= 27°C −1.5 -- 1.5 %

RT9818A/E -- 0 --

RT9818B/F 35 55 75

RT9818C/G 143 220 297

RT9818D/H

≥ 1.02 x VTH

292 450 608

3 = VDD < VTH I

-- 0.01VTH 0.016VTH V

HYS

> 3.5mA -- -- 0.4 V

SINK

DS9818-10 May 2013 www.richtek.com

RT9818

Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2. θ

is measured at T

Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. The voltage V

through the pull-up resistor. For typical application (R=100kΩ), V

= 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3.

can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing

is less than 0.2V.

DS9818-10 May 2013www.richtek.com

Typical Operating Characteristics

)

RT9818

Nch Driver Output Current vs. V

2.4

RT9818A-12

= 1.1V

2.0

1.6

1.2

0.8

Output Current (mA

0.4

0.0 0 0.3 0.6 0.9 1.2 1.5

= 1V

VDS (V)

Nch Driver Out put Current vs. V

120

RT9818A-45

100

Output Current (mA

012345

VDS (V)

VDD = 4.4V = 4V = 3.5V = 3V = 2.5V = 2V = 1.5V

Nch Driver Output Cu rrent vs. V

RT9818C-30

Output Current (mA

0 0.5 1 1.5 2 2.5 3 3.5

= 1.5V

= 2V

= 2.5V

= 2.8V

VDS (V)

Output Voltage v s. Input Voltage

RT9818

Output Voltage (V)

0123456

1.2V

Input Voltage (V)

4.5V

Supply Current vs. Input Voltage

RT9818A-12

Supply Current (μA

0123456

80°C

25°C

−30°C

Input Voltage (V)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

Supply Current (μA

0.5

0.0

Supply Current vs. Input Voltage

RT9818C-30

80°C

25°C

−30°C

0123456

Input Voltage (V)

DS9818-10 May 2013 www.richtek.com

+ 10 hidden pages

Richtek RT9818A-13PY, RT9818A-14PV, RT9818A-15PV, RT9818A-16PV, RT9818A-18GV Schematic [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual