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LTC2911CTS8-4#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2911
1
2911f
TYPICAL APPLICATION
DESCRIPTION
Precision Triple Supply
Monitor with Power-Fail
Comparator
The LTC
®
2911 is a low power, high accuracy triple supply
monitor with a power-fail comparator. Reset timeout may
be selected with an external capacitor or set to an internally
generated 200ms.
The V1 pin monitors a 3.3V supply. The V2 pin monitors a
5V, 2.5V, 1.8V, 1.2V or adjustable supply. A third adjustable
input has a nominal 0.5V threshold allowing a resistive
divider to configure its threshold. All three comparators
feature a tight 1.5% threshold accuracy over the entire
operating temperature range while a glitch filter ensures
reliable reset operation.
A spare comparator can be configured to provide early
warning of a low voltage condition. It causes the PFO output
to pull low when the voltage of the PFI input falls below 0.5V,
allowing the power-fail threshold to be configured with
a resistive divider. A latch feature on the TMR pin allows
the RST output to be latched to prevent system resets,
simplifying margin testing.
FEATURES
APPLICATIONS
n
Ultralow Voltage Reset: V
CC
= 0.5V Guaranteed
n
Monitors Three Inputs Simultaneously:
3.3V, 5V, ADJ (LTC2911-1)
3.3V, 2.5V, ADJ (LTC2911-2)
3.3V, 1.8V, ADJ (LTC2911-3)
3.3V, 1.2V, ADJ (LTC2911-4)
3.3V, ADJ, ADJ (LTC2911-5)
n
±1.5% Threshold Accuracy
n
Power-Fail Monitor
n
RST State Can Be Held for Margining
n
Low Supply Current: 30µA Typical
n
Input Glitch Immunity
n
Adjustable Reset Timeout Period
n
Selectable Internal Timeout Saves Components
n
Space Saving 8-Lead TSOT-23 and 3mm × 2mm DFN
Packages
n
Network Servers
n
Desktop and Notebook Computers
n
Automotive and Industrial Electronics
RST Output Voltage With 10k Pull-Up to V1
+
LTC2911-2
76.8k
10k
3.3V
2.5V
1.0V
100k
576k
Li-Ion
BATTERY
STACK
100k
V1
TMR
V2
ADJ
RESET
LOBAT
RST
PFO
PFI
t
RST
= 200ms
2911 TA01a
GND
SYSTEM
LOGIC
DC/DC
CONVERTER
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6949965, 7292076.
V1 (V)
0
V
RST
(V)
2
4
6
1
3
5
0.5 1.5 2.5 3.5
2911 TA01b
5.50 1 2 3 4 4.5 5
V1 = V2
LTC2911
2
2911f
Supply Voltages
V1, V2 ................................................... –0.3V to 6.5V
Input Voltages
ADJ ....................................................... –0.3V to 6.5V
PFI ........................................................... –0.3V to 2V
TMR ............................................–0.3V to (V1 + 0.3V)
Output Voltages
RST, PFO .............................................. –0.3V to 6.5V
ORDER INFORMATION
ABSOLUTE MAXIMUM RATINGS
PFI 1
ADJ 2
TMR 3
GND 4
8 V2
7 V1
6 PFO
5 RST
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C, θ
JA
= 195°C/W
TOP VIEW
9
GND
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1V2
V1
PFO
RST
PFI
ADJ
TMR
GND
T
JMAX
= 150°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) IS GND, PCB CONNECTION OPTIONAL
PIN CONFIGURATION
(Notes 1, 2, 3)
Operating Temperature Range
LTC2911C ................................................ 0°C to 70°C
LTC2911I.............................................. –40°C to 85°C
LTC2911H .......................................... –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 ............................................................ 300°C
LTC2911 C DDB –1 #TRM PBF
LEAD FREE DESIGNATOR
PBF = Lead Free Finish Parts
None = Lead Based Finish Parts
TAPE AND REEL
#TR = Tape and Reel
#TRM = 500-Piece Tape and Reel
PRODUCT SELECTION
–1, –2, –3, –4, –5
See Product Selection Guide for Details
PACKAGE TYPE
DDB = 8-Lead (3mm × 2mm) Plastic DFN
TS8 = 8-Lead Plastic TSOT-23
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
PRODUCT PART NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC2911
3
2911f
PRODUCT SELECTION GUIDE
PART NUMBER PART MARKING PACKAGE DESCRIPTION V1 V2
LTC2911-1 LFHZ
8-Lead (3mm × 2mm) Plastic DFN
3.3V 5V
LTC2911-2 LFPG
8-Lead (3mm × 2mm) Plastic DFN
3.3V 2.5V
LTC2911-3 LFPJ
8-Lead (3mm × 2mm) Plastic DFN
3.3V 1.8V
LTC2911-4 LFPM
8-Lead (3mm × 2mm) Plastic DFN
3.3V 1.2V
LTC2911-5 LFPP
8-Lead (3mm × 2mm) Plastic DFN
3.3V ADJ
LTC2911-1 LTFJB 8-Lead Plastic TSOT-23 3.3V 5V
LTC2911-2 LTFPH 8-Lead Plastic TSOT-23 3.3V 2.5V
LTC2911-3 LTFPK 8-Lead Plastic TSOT-23 3.3V 1.8V
LTC2911-4 LTFPN 8-Lead Plastic TSOT-23 3.3V 1.2V
LTC2911-5 LTFPQ 8-Lead Plastic TSOT-23 3.3V ADJ
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT33
3.3V, 5% Reset Threshold V1 Input
l
3.036 3.086 3.135 V
V
RT50
5V, 5% Reset Threshold V2 Input (LTC2911-1)
l
4.600 4.675 4.750 V
V
RT25
2.5V, 5% Reset Threshold V2 Input (LTC2911-2)
l
2.300 2.338 2.375 V
V
RT18
1.8V, 5% Reset Threshold V2 Input (LTC2911-3)
l
1.656 1.683 1.710 V
V
RT12
1.2V, 5% Reset Threshold V2 Input (LTC2911-4)
l
1.104 1.122 1.140 V
V
RTA
ADJ Pin Threshold ADJ Input and V2 Input of
LTC2911-5
l
492.5 500 507.5 mV
V
PFT
PFI Pin Threshold PFI Input Threshold (Falling)
l
492.5 500 507.5 mV
∆V
PFT
PFI Hysteresis
l
10 15 19 mV
V
CC,OP
Minimum Operating Voltage to Guarantee PFO
High (Note 3)
V
PFI
= 0.55V
l
2.3 V
I
V1
V1 input Current (Note 4) V1 = 3.3V, V1 > V2
l
10 30 80 µA
V1 = 3.3V, V1 < V2
l
3 10 30 µA
I
V2
V2 Input Current (Note 4) V2 = 5V (LTC2911-1)
V2 = 2.5V (LTC2911-2)
V2 = 1.8V (LTC2911-3)
V2 = 1.2V (LTC2911-4)
V2 = 0.55V (LTC2911-5)
C-Grade/I-Grade
H-Grade
l
l
l
l
l
l
10
3
2
2
35
10
10
10
80
30
30
30
±15
±40
µA
µA
µA
µA
nA
nA
I
ADJ
ADJ Input Current V
ADJ
= 0.55V (C-Grade) (I-Grade)
V
ADJ
= 0.55V (H-Grade)
l
l
±15
±40
nA
nA
I
PFI
PFI Input Current V
PFI
= 0.55V (C-Grade) (I-Grade)
V
PFI
= 0.55V (H-Grade)
l
l
±15
±40
nA
nA
I
TMR(UP)
TMR Pull-Up Current V
TMR
= 1V
l
–1.5 –2.2 –2.9 µA
I
TMR(DOWN)
TMR Pull-Down Current V
TMR
= 1V
l
1.5 2.2 2.9 µA
I
PU
RST, PFO Pull-Up Current V
PIN
= 0V
l
–20 –29 –40 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
ADJ
= 0.55V, V
PFI
= 0.55V, V1 = 3.3V unless otherwise noted. (Notes 2, 3)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2911CTS8-4#TRMPBF

Mfr. #:
Buy LTC2911CTS8-4#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Precision Tripply Supply Supervisor with Power-Fail Comparator (3.3V, 1.2V, ADJ)
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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