LTC2907 LINER [Linear Technology], LTC2907 Datasheet

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LTC2907

Manufacturer Part Number
LTC2907
Description
36V Nano-Current Two Input Voltage Monitor
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
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APPLICATIONS
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LTC2960 Option Table
TYPICAL APPLICATION
Li-Ion
Li-Ion
4.2V
4.2V
LTC2960-1
LTC2960-2
LTC2960-3
LTC2960-4
850nA Quiescent Current
Operating Range: 2.5V < V
1.5% (Max) Accuracy Over Temperature
Adjustable Reset Threshold
Wide Temperature Range (–40°C to 125°C)
Adjustable IN
Manual Reset Input
Compact 2mm × 2mm 8-lead DFN and
TSOT-23 (ThinSOT™) Packages
Portable Equipment
Battery Powered Equipment
Security Systems
Automotive Systems
Option
POWER-FAIL FALLING THRESHOLD = 6.410V
RESET FALLING THRESHOLD = 1.693V
6V < V
+
+
IN
< 8.4V
C1
0.1μF
50V
ADJ/IN
ADJ/IN
ADJ/IN
ADJ/IN
Inputs
+
/IN
R2
6.04M
R1
402k
+
+
Battery and Regulator Monitor
Threshold
Reset Timeout Period
V
IN
MR
CC
LTC2960-3
15ms/200ms
15ms/200ms
+
GND
200ms
200ms
CC
DV
RST
OUT
ADJ
CC
< 36V
RESET
LOW BATTERY
LTC3632
DC/DC
GND
36V Open-Drain
36V Open-Drain
Active Pull-up
Active Pull-up
Output Type
R4
1.3M
R3
402k
2960 TA01
DESCRIPTION
The LTC
voltage monitor, ideally suited for multicell battery ap-
plications. External resistive dividers configure custom
comparator thresholds. The supervisory circuit monitors
the ADJ input and pulls the RST output low when the input
drops below threshold. A reset timeout period delays the
return of the RST output to a high state when the input
rises above the threshold. The spare comparator allows
voltage conditions to be detected with either a non-inverting
input, IN
IN
is provided for external activation of the reset output.
Other options provided on the LTC2960-1/LTC2960-2 in-
clude a reset timeout period select pin, RT, to select between
15ms or 200ms reset timeout periods. The LTC2960-3/
LTC2960-4 have a fixed 200ms reset timeout period. The
RST and OUT outputs are available with active pull-up cir-
cuits to an output logic supply pin (LTC2960-3/LTC2960-4)
or 36V open-drain outputs (LTC2960-1/LTC2960-2).
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Two Input Voltage Monitor
C2
1μF
(LTC2960-2/LTC2960-4). A manual reset (MR) input
V
1.8V
OUT
®
+
2960 is a nano-current, high voltage two input
(LTC2960-1/LTC2960-3) or an inverting input,
1200
36V Nano-Current
900
600
300
0
0
Supply Current vs Supply Voltage
MR=5V, 27C
8
16
V
CC
(V)
24
LTC2960
32
2960 TA01a
40
1
2960f

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LTC2907 Summary of contents

Page 1

FEATURES n 850nA Quiescent Current n Operating Range: 2.5V < V < 36V CC n 1.5% (Max) Accuracy Over Temperature n Adjustable Reset Threshold n Wide Temperature Range (–40°C to 125°C) + – n Adjustable IN /IN Threshold n Manual ...

Page 2

LTC2960 ABSOLUTE MAXIMUM RATINGS (Notes 1 & 2) Input Voltages , RT, MR .......................................... –0.3V to 40V ........................................................ –0. – ADJ ......................................... –0.3V to 3.5V Output Voltages (LTC2960-1/LTC2960-2) RST, OUT ...

Page 3

ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL LTC2960CTS8-1#TRMPBF LTC2960CTS8-1#TRPBF LTC2960ITS8-1#TRMPBF LTC2960ITS8-1#TRPBF LTC2960HTS8-1#TRMPBF LTC2960HTS8-1#TRPBF LTC2960CTS8-2#TRMPBF LTC2960CTS8-2#TRPBF LTC2960ITS8-2#TRMPBF LTC2960ITS8-2#TRPBF LTC2960HTS8-2#TRMPBF LTC2960HTS8-2#TRPBF LTC2960CTS8-3#TRMPBF LTC2960CTS8-3#TRPBF LTC2960ITS8-3#TRMPBF LTC2960ITS8-3#TRPBF LTC2960HTS8-3#TRMPBF LTC2960HTS8-3#TRPBF LTC2960CTS8-4#TRMPBF LTC2960CTS8-4#TRPBF LTC2960ITS8-4#TRMPBF LTC2960ITS8-4#TRPBF LTC2960HTS8-4#TRMPBF LTC2960HTS8-4#TRPBF Consult LTC Marketing for ...

Page 4

LTC2960 ELECTRICAL CHARACTERISTICS range, otherwise specifications are at T SYMBOL PARAMETER CONTROL INPUTS: MR Control Input Threshold RT RT Control Input Threshold Minimum Detectable Pulse Width t PW Propagation Delay to RST Falling t ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS MR Rising Threshold/Open Voltage 2.4 MR OPEN VOLTAGE 27°C 1.9 1.4 MR INPUT THRESHOLD 27°C 0.9 0.4 2.5 3.0 3.5 4.0 4.5 V (V) CC 2960 G04 + – ADJ Threshold ...

Page 6

LTC2960 PIN FUNCTIONS ADJ: Reset Threshold Adjustment Input. Tie to resistive divider to configure desired reset threshold (LTC2960-3/LTC2960-4) Logic Supply Input. Used CC for setting the logic swing of the RST and OUT outputs. Useful for interfacing with ...

Page 7

BLOCK DIAGRAM V CC REGULATOR MR ADJ – (LTC2960-1/LTC2960-3) – IN (LTC2960-2/LTC2960-4) – TIMING DIAGRAM + HYS OUT V TH – HYS ...

Page 8

LTC2960 APPLICATIONS INFORMATION VOLTAGE MONITORING The LTC2960 is a voltage supervisor with a wide operating voltage range up to 36V with only 850nA quiescent current. The supervisor has two outputs, RST and OUT that pro- vide voltage monitoring capabilities for ...

Page 9

APPLICATIONS INFORMATION The closest 1% resistor value is 34k easily obtained from – R1 – – 499k – 34k SUM R3 = 7.467MΩ The closest 1% resistor value is 7.5MΩ. Plugging the ...

Page 10

LTC2960 APPLICATIONS INFORMATION provide effective pull-down without excessively loading the pull-up circuitry. A 100k resistor from output to ground is satisfactory for most applications. When the status outputs are high, power is dissipated in the pull-down resistors falls ...

Page 11

APPLICATIONS INFORMATION V A LTC2960 681k + IN OUT R5 R6 48.7k 6.81M 2960 F06 Figure 6. External Hysteresis The addition of R6 allows OUT to sink or source current + to the summing junction at IN ...

Page 12

LTC2960 APPLICATIONS INFORMATION When a supply voltage is abruptly connected to the input resonant ringing can occur as a result of series inductance. The peak voltage could rise to 2x the input supply but in practice can reach 2.5x if ...

Page 13

TYPICAL APPLICATIONS R2 + Li-Ion 6.04M 4.2V C1 0.1μF 25V + Li-Ion 4.2V R1 402k UVLO FALLING THRESHOLD = 6.410V RESET FALLING THRESHOLD = 2.649V V BAT 6V TO 8.4V + Li-Ion 4.2V C1 0.1μF 25V + Li-Ion 4.2V – ...

Page 14

LTC2960 TYPICAL APPLICATIONS The LTC2960-2 in Figure 10 is yet another way to prevent excessive discharge of a battery. The high voltage OUT output is used to drive the gate of a PMOS switch to in- terrupt the path to ...

Page 15

PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ 2.55 ±0.05 0.64 ±0.05 1.15 ±0.05 (2 SIDES) 0.45 BSC 1.37 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED NOTE: 1. DRAWING IS NOT ...

Page 16

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