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PDF LTC2965 Data sheet ( Hoja de datos )
| Número de pieza | LTC2965 | |
| Descripción | 100V Micropower Single Voltage Monitor | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
n Wide Operating Range: 3.5V to 100V
n Wide Monitoring Range: 3.5V to 98V
n Quiescent Current: 7µA
n Adjustable Threshold Range
n Internal High Value Resistive Dividers
n ±1.4% (Max) Threshold Accuracy Over Temperature
n Polarity Selection
n 100V Rated Outputs
n Selectable Built-In Hysteresis
n 16-Lead MS and 8-Lead 3mm × 3mm DFN Packages
Applications
n Portable Equipment
n Battery-Powered Equipment
n Telecom Systems
n Automotive/Industrial Electronics
LTC2965
100V Micropower Single
Voltage Monitor
Description
The LTC®2965 is a low current, high voltage single chan-
nel voltage monitor. Internal high value resistors sense
the input monitor pin providing a compact and low power
solution for voltage monitoring. Two comparator reference
inputs (INH and INL) are included to allow configuration of
a high and low threshold using an external resistive divider
biased from the on-chip reference. A range selection pin
is provided to set the internal resistive divider for 10x or
40x scaling. The thresholds are scaled according to the
range selection settings. Additionally, either INH or INL
can be grounded to enable built-in hysteresis. Polarity
selection pin allows the output to be inverted. The output
is 100V capable and includes a 500k pull-up resistor to
an internal supply.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
Typical Application
THRESHOLD
CONFIGURATION
Undervoltage Monitor
24V
200k
91k
909k
VIN
REF
INH
LTC2965
INL
100k
OUT
24V UNDERVOLTAGE
5V
5V
SYS
PS RS GND
POLARITY AND RANGE SELECTION
RISING THRESHOLD
FALLING THRESHOLD
HYSTERESIS
RANGE
20.0V
18.2V
1.8V
10x
2965 TA01a
VIN MONITOR RANGE
3.5V to 24.5V
14V to 98V
RANGE SELECTION
10x
40x
Supply Current vs VIN
12
10
8
6
4
2 RANGE = 40x
OUT = LOW
0 IREF = 0µA
0 20
40
60
VIN (V)
–45°C
25°C
90°C
125°C
80 100
2965 TA01b
For more information www.linear.com/LTC2965
2965f
1
1 page  
Typical Performance Characteristics
Voltage Output High vs Pull-Down
Current (OUT)
4 VIN = 12V
3
2
1 –45°C
25°C
90°C
125°C
0
0 –3 –6 –9 –12
PULL-DOWN CURRENT (µA)
2965 G09
Voltage Output Low vs Pull-Up
Current (OUT)
1.50
–45°C
25°C
1.25 90°C
125°C
1.00
0.75
0.50
0.25
0
01 2 3 4
PULL-UP CURRENT (mA)
5
2965 G10
LTC2965
Voltage Output High
vs Input Voltage
3.5
I = –1µA
3.2
2.9
2.6
2.3
2.0
1.7
3
4
56
VIN (V)
78
2965 G11
For more information www.linear.com/LTC2965
2965f
5
5 Page 
LTC2965
Applications Information
Error Analysis
VIN thresholds are subject to the following errors:
The actual VIN falling threshold has an error tolerance of
±214mV or ±1.18%.
• REF Voltage Variation (∆VREF)
Improving Threshold Accuracy
• Comparator Offset (VOS)
The biggest threshold error terms are:
• Internal Divider Range Error (AVERR)
• External Resistive Divider Accuracy
• External Resistive Divider Error (AXERR)
• REF Voltage Variation
The effect these errors have on the VIN threshold is
expressed by:
VERR
=
RANGE
•
± VOS
±
∆VREF
•
VINH(L)
VREF
±
VINH(L)
•
AXERR
±RANGE • AVERR • VINH(L)
AXERR
=
2•
TOLERANCE
100
•
1–
VINH(L)
VREF
External divider error is determined by the percentage toler-
ance values of the resistors. If 1% tolerance resistors are
used in the external divider then there is a 2% worst-case
voltage error associated with it. The effects of comparator
offset and VREF voltage are uncorrelated with each other.
Therefore, a Root-Sum-Square can be applied to the error
voltage referred to VIN. Using the example from Threshold
Configuration and assuming 1% resistors implement the
external resistive divider, the falling VIN threshold of ap-
proximately 18V has an error tolerance of:
Even using 1% tolerance resistors, external resistive divider
accuracy still accounts for as much as ±2% threshold error
while REF voltage variation accounts for ±1% threshold
error. In order to minimize these threshold error terms,
an external reference can be used to set the thresholds for
INH/INL as shown in Figure 4. An LT6656-2.048 has an
initial accuracy of 0.05% and provides bias via the 0.1%
resistive divider network for INH and INL. It is biased off
of the LTC2965 REF pin. The threshold error tolerance
is calculated using the method described in the Typical
Applications section with ∆VREF = ±1.024mV given the
initial accuracy of the LT6656 2.048V output and using
0.1% tolerance resistors for the external divider.
VERR(REF )
=
(RANGE)
±∆VREF
•
VINL
VREF
=
(10)
•
±1.024mV
•
1.8V
2.048V
=
±9mV
VERR(REF )
=
(RANGE)
±∆VREF
•
VINL
VREF
=
(10)
•
±24mV
•
1.8V
2.402V
=
±180mV
VERR(EXT )
=
(RANGE)
± VINL
•
2
•
0.001•
1–
VINL
VREF
= (10) •(±1.8V • 0.0005) = ±9mV
VERR(VOS) = (RANGE)(±∆VOS ) = (10) •(±1.6mV) = ±16mV
VERR(EXT )
=
(RANGE)
± VINL
•2
•
0.01•
1–
VINL
VREF
= (10) •(±1.8V • 0.005) = ±90mV
VERR(VOS) = (RANGE)(±∆VOS ) = (10) •(±16mV) = ±16mV
VERR(GS) = (RANGE)(±AVERR )(±VINL )
= (10) •(±0.004)•(1.8V) = ±72mV
VERR(GS) = (RANGE)(±AVERR )(±VINL )
= (10) •(±0.004)•(1.8V) = ±72mV
VERR = VE2RR(REF) + VE2RR(EXT) + VE2RR(VOS) + VE2RR(GS)
= (±9mV)2 +(±9mV)2 +(±16mV)2 +(±72mV)2
= ±75mV
VERR = VE2RR(REF) + VE2RR(EXT) + VE2RR(VOS) + VE2RR(GS)
= (±180mV)2 +(±90mV)2 +(±16mV)2 +(±72mV)2
The resulting VIN threshold error is reduced to ±0.42%
from ±1.18% in the previous error analysis example.
= ±214mV
For more information www.linear.com/LTC2965
2965f
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LTC2965.PDF ] | |
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