RT9827 [RICHTEK]
Micro-Power Voltage Detector; 微功耗电压检测器
| 型号： | RT9827 |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | Micro-Power Voltage Detector |
| 文件： | 总14页 (文件大小：161K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9827
Micro-Power Voltage Detector
General Description
Features
z Internally Fixed Threshold 1.2V to 5V in 0.1V Step
The RT9827 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 RT9827 performs supervisory function by sending
out a reset signal whenever the VDD voltage falls below a
preset threshold level. This reset signal will last the whole
period before VDD recovering. Once VDD recovered
upcrossing the threshold level, the reset signal will be
released after a certain delay time. RT9827 is provided in
SC-82, SC-70-3, SOT-23-3, SOT-23-5 and SOT-89
packages.
z High Accuracy 1.5%
z Low Supply Current 3μA
z No External Components Required
z Quick Reset within 20μs
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
Applications
z Computers
Ordering Information
-
RT9827
z Controllers
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
B : SOT-23-5
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment
X : SOT-89
Y : SC-82
YR : SC-82 (R-Type)
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Threshold Voltage
12 : 1.2V
13 : 1.3V
:
Typical Application Circuit
49 : 4.9V
50 : 5.0V
RT9827
GND
100k
Pull Up
Reset Active Timeout Period
A = 0ms (RESET)
B = 55ms (RESET)
C = 220ms (RESET)
D = 450ms (RESET)
E = 0ms (RESET)
VDD
µP
VDD
RESET/
RESET
RESET/
RESET
F = 55ms (RESET)
G = 220ms (RESET)
H = 450ms (RESET)
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.
DS9827-01 April 2011
www.richtek.com
1
RT9827
Pin Configurations
(TOP VIEW)
VDD
GND
NC
RESET/
NC
RESET
3
4
3
4
3
2
2
2
VDD
RESET/
RESET
GND
RESET/
RESET
VDD
GND
SC-82
SC-82 (R-Type)
SC-70-3
NC
NC
VDD
VDD
5
4
3
3
1
2
3
2
3
2
2
VDD GND
GND
GND
RESET/
RESET
RESET/
RESET
RESET/
RESET
VDD GND
RESET/
RESET
SOT-23-3
SOT-23-3 (L-Type)
SOT-23-5
SOT-89
Functional Pin Description
Pin Name
Pin Function
GND
Ground.
RESET
RESET
VDD
Active Low Open-Drain Reset Output.
Active High Open-Drain Reset Output.
Supply Voltage Input.
Function Block Diagram
VDD
RESET/
RESET
Timer
CMP
N MOS
VSET
GND
Threshold
Voltage Setting
POR
Power On Reset
www.richtek.com
2
DS9827-01 April 2011
RT9827
Absolute Maximum Ratings (Note 1)
z Terminal Voltage (with Respect to GND)
VDD ---------------------------------------------------------------------------------------------------------------------- −0.3V to 6.0V
z All Other Inputs ------------------------------------------------------------------------------------------------------ −0.3V to (VDD+ 0.3V)
z Input Current, IVDD --------------------------------------------------------------------------------------------------- 20mA
z Power Dissipation, PD @ 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 125°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
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, TA = 25°C, unless otherwise specified)
Parameter
Operating VDD (VOUT) Range
Supply Current
Symbol
VDD
Test Conditions
Min
0.9
--
Typ
--
Max
6
Unit
V
IDD
VTH = 3V, VDD = 4.5V
3
8
μA
V
Reset Threshold
VTH
--
1.2 to 5
--
--
Threshold Voltage Accuracy
VDD Drop to Reset Delay
ΔVTH
tRD
−1.5
--
1.5
--
%
Drop = VTH − 125mV
VDD ≥ 1.02 × VTH
20
μs
RT9827A/E
--
0
--
RT9827B/F
RT9827C/G
RT9827D/H
35
55
75
297
608
Reset Active Time
Out Period
tRP
ms
143
292
220
450
RESET Output Voltage Low
(Note 5)
VOL
3 = VDD < VTH SINK
I
> 3.5mA
--
--
--
0.4
V
V
Hysteresis Width
VHYS
0.01VTH 0.016VTH
DS9827-01 April 2011
www.richtek.com
3
RT9827
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are
for stress ratings. 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 for extended
periods may remain possibility to affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
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 VOL can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing
through the pull-up resistor. For typical application (R=100kΩ), VOL is less than 0.2V.
www.richtek.com
4
DS9827-01 April 2011
RT9827
Typical Operating Characteristics
Nch Driver Output Current vs. VDS
Nch Driver Output Current vs. VDS
60
50
40
30
20
10
0
2.4
RT9827C-30
RT9827A-12
VDD = 2.8V
VDD = 1.1V
2.0
VDD = 2.5V
1.6
1.2
VDD = 2.0V
VDD = 1.0V
0.8
VDD = 1.5V
0.4
0.0
0
0.5
1
1.5
2
2.5
3
3.5
0
0.3
0.6
0.9
1.2
1.5
VDS (V)
VDS (V)
Output Voltage vs. Input Voltage
Nch Driver Output Current vs. VDS
7
6
5
4
3
2
1
0
120
100
80
60
40
20
0
RT9827
RT9827A-45
VDD = 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
4.5V
1.2V
= 1.5V
0
1
2
3
4
5
0
1
2
3
4
5
6
VDS (V)
Input Volgate (V)
Supply Current vs. Input Voltage
Supply Current vs. Input Voltage
6
5
4
3
2
1
0
4.0
RT9827C-30
RT9827A-12
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
80°C
25°C
80°C
25°C
-30°C
-30°C
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
DS9827-01 April 2011
www.richtek.com
5
RT9827
Power-Down Reset Delay vs. Temperature
Supply Current vs. Input Voltage
14
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
RT9827A-12
RT9827A-45
12
10
8
80°C
25°C
VDROP = 200mV
-30°C
VDROP = 150mV
VDROP = 250mV
6
4
2
0
0
1
2
3
4
5
6
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Power-Down Reset Delay vs. Temperature
Power-Down Reset Delay vs. Temperature
45
45
RT9827C-30
RT9827A-45
40
40
35
30
25
20
15
10
5
35
30
25
20
15
10
5
VDROP = 200mV
VDROP = 150mV
VDROP = 250mV
VDROP = 200mV
VDROP = 150mV
VDROP = 250mV
0
0
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Reset Threshold Deviation vs. Temperature
Nch Driver Sink Current vs. Input Voltage
6
40
RT9827
RT9827C-30, VDS = 0.5V
5.0V
35
30
25
20
15
10
5
-30°C
5
4.5V
25°C
4.2V
2.2V
4
3
2
1
80°C
1.2V
75
0
0
0.5
1
1.5
2
2.5
3
3.5
-50
-25
0
25
50
100
125
Input Voltage(V)
Temperature (°C)
www.richtek.com
6
DS9827-01 April 2011
RT9827
Power-Up Reset Time-Out vs. Temperature
Nch Driver Sink Current vs. Input Voltage
500
50
40
30
20
10
0
RT9827A-45, VDS = 0.5V
RT9827C
-30°C
400
300
200
100
0
25°C
VTH = 2.9V
80°C
VTH = 3.0V
0
1
2
3
4
5
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Power-Up Reset Time-Out vs. Temperature
Output Delay Time vs. Load Capacitance
100
1000.00
RT9827
RT9827A
80
60
40
20
0
100.00
10.00
1.00
VTH = 5.0V
VTH = 4.5V
VTH = 1.2V
0.10
VTH = 4.5V
0.0010
0.01
0.0001
0.0100
0.1000
1.0000
-50
-25
0
25
50
75
100
125
Load Capacitance (µF)
Temperature (°C)
Nch Driver Output Current vs. Input Voltage
Nch Driver Output Current vs. VDS
60
160
140
120
100
80
RT9827G-31
RT9827G-31
VDS = 0.5V
-30°C
25°C
50
40
30
20
10
0
VDD = 6.0V
= 5.5V
80°C
= 5.0V
= 4.5V
= 4.0V
= 3.5V
60
40
20
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
VDS (V)
DS9827-01 April 2011
www.richtek.com
7
RT9827
Power Down Reset Time-Out vs. Temperature
Output Voltage vs. Input Voltage
7
6
5
4
3
2
1
0
500
400
300
200
100
0
RT9827G-31
RT9827G-31
0
1
2
3
4
5
6
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Power Down Reset Time-Out vs. Temperature
30
RT9827G-31
25
20
VDROP = 200mV
VDROP = 150mV
15
10
VDROP = 250mV
5
0
-50
-25
0
25
50
75
100
125
Temperature (°C)
www.richtek.com
8
DS9827-01 April 2011
RT9827
Application Information
Multiple Supplies
Mainly, the pull-up connected to the RT9827 will connect to the supply voltage that is being monitored at the IC’ s VDD
pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry
powered by some other supply.
Benefits of Highly Accurate Reset Threshold
Most μP supervisor ICs have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages.
This ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below
nominal.
DS9827-01 April 2011
www.richtek.com
9
RT9827
Outline Dimension
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
1.800
1.800
1.100
0.100
1.350
0.400
2.450
2.250
0.031
0.000
0.045
0.006
0.071
0.071
0.044
0.004
0.054
0.016
0.096
0.089
b
C
D
e
1.300
0.051
H
L
0.080
0.210
0.260
0.460
0.003
0.008
0.010
0.018
SC-70-3 Surface Mount Package
www.richtek.com
10
DS9827-01 April 2011
RT9827
D
e
H
L
B
C
A
b1
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
0.350
1.800
1.800
1.100
0.100
1.350
0.400
0.500
2.450
2.200
0.031
0.000
0.045
0.006
0.014
0.071
0.071
0.043
0.004
0.053
0.016
0.020
0.096
0.087
b
b1
C
D
e
1.300
0.051
H
L
0.080
0.200
0.260
0.460
0.003
0.008
0.010
0.018
SC-82 Surface Mount Package
DS9827-01 April 2011
www.richtek.com
11
RT9827
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
1.803
0.080
0.300
1.295
0.152
1.803
0.508
2.997
3.099
2.007
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.071
0.003
0.012
0.051
0.006
0.071
0.020
0.118
0.122
0.079
0.010
0.024
b
C
D
e
H
L
SOT-23-3 Surface Mount Package
www.richtek.com
12
DS9827-01 April 2011
RT9827
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
SOT-23-5 Surface Mount Package
DS9827-01 April 2011
www.richtek.com
13
RT9827
D
D1
A
B
C
C1
e
e
H
A
b
b
b1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
b
1.397
0.356
2.388
0.406
3.937
0.787
4.394
1.397
1.448
0.356
1.600
0.483
2.591
0.533
4.242
1.194
4.597
1.753
1.549
0.432
0.055
0.014
0.094
0.016
0.155
0.031
0.173
0.055
0.057
0.014
0.063
0.019
0.102
0.021
0.167
0.047
0.181
0.069
0.061
0.017
B
b1
C
C1
D
D1
e
H
3-Lead SOT-89 Surface Mount Package
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design,
specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed
by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
www.richtek.com
14
DS9827-01 April 2011
相关型号：
©2020 ICPDF网 联系我们和版权申明