LTC2905CTS8#PBF Linear Technology, LTC2905CTS8#PBF Datasheet

LTC2905CTS8#PBF

Manufacturer Part Number
LTC2905CTS8#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2905CTS8#PBF

Voltage Supervisor Type
Voltage Monitor
Number Of Voltage Supervisors
2
Operating Supply Voltage (min)
1V
Package Type
TSOT-23
Operating Temperature Classification
Commercial
Operating Temp Range
0C to 70C
Pin Count
8
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC2905CTS8#PBFLTC2905CTS8
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC2905CTS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC2905CTS8#PBFLTC2905CTS8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
APPLICATIONS
TYPICAL APPLICATION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
CONVERTER
Monitors Two Inputs Simultaneously
Nine Threshold Combinations
Three Supply Tolerances (5%, 7.5%, 10%)
Guaranteed Threshold Accuracy: ±1.5% of
Monitored Voltage Over Temperature
Internal V
Power Supply Glitch Immunity
200ms Reset Time Delay (LTC2904 Only)
Adjustable Reset Time Delay (LTC2905 Only)
Open Drain RST Output
Guaranteed RST for V1 ≥ 1V or V2 ≥ 1V
Low Profi le (1mm) SOT-23 (ThinSOT
(3mm × 2mm) DFN Packages
Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
DC/DC
0.1μF
5V, 3.3V Dual Supply Monitor with 5% Tolerance
CC
Auto Select
V1
S1
S2
TOL
LTC2905
3.3V
5V
TMR
GND
RST
V2
TM
0.1μF
) and Plastic
22nF
29045 TA01
SYSTEM
LOGIC
DESCRIPTION
The LTC
tended for systems with two supply voltages. The dual
supply monitors have a common reset output with delay
(200ms for the LTC2904 and adjustable using an exter-
nal capacitor for the LTC2905). This product provides a
precise, space-conscious and micropower solution for
supply monitoring.
The LTC2904/LTC2905 feature a tight 1.5% threshold
accuracy over the whole operating temperature range, and
glitch immunity to ensure reliable reset operation without
false triggering. The open drain RST output is guaranteed
to be in the correct state for inputs down to 1V.
The LTC2904/LTC2905 also feature three programming
input pins, which program the threshold and tolerance level
without requiring any external components. These three
programming pins provide a total of 27 different voltage
level and tolerance combinations, eliminating the need to
have different parts for development and implementation
of different systems with different voltage levels requiring
monitoring function.
Precision Dual Supply Monitors
with Pin-Selectable Thresholds
Table 1. Voltage Threshold Programming
®
2904/LTC2905 are dual supply monitors in-
5.0
3.3
3.3
3.3
3.3
2.5
2.5
2.5
2.5
V1
LTC2904/LTC2905
3.3
2.5
1.8
1.5
1.2
1.8
1.5
1.2
1.0
V2
Open
Open
Open
GND
GND
GND
S1
V1
V1
V1
Open
Open
Open
GND
GND
GND
S2
V1
V1
V1
29045fc
1

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LTC2905CTS8#PBF Summary of contents

Page 1

... Handheld Devices n Network Servers n Core, I/O Monitor L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5V, 3.3V Dual Supply Monitor with 5% Tolerance 5V DC/DC 3 ...

Page 2

LTC2904/LTC2905 ABSOLUTE MAXIMUM RATINGS Terminal Voltages V1, V2 ...................................................... –0. S1, S2, TOL ...............................–0. RST .......................................................... –0. RST (LTC2904) ........................................ –0. TMR (LTC2905) ....................................... –0. PIN CONFIGURATION TOP VIEW GND ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T (Notes 2, 3) SYMBOL PARAMETER V 5V, 5% Reset Threshold RT50 5V, 7.5% Reset Threshold 5V, 10% Reset Threshold V 3.3V, 5% Reset Threshold RT33 3.3V, 7.5% Reset Threshold 3.3V, ...

Page 4

LTC2904/LTC2905 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 25°C unless otherwise noted Threshold Voltage vs Temperature 4.75 4.70 5% 4.65 4.60 7.5% 4.55 4.50 4.45 10% 4.40 4.35 –50 – TEMPERATURE ( ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 25°C unless otherwise noted Temperature TOL = 1.4V 19.5 19.0 18.5 18.0 17.5 17.0 –50 –25 ...

Page 6

LTC2904/LTC2905 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 25°C unless otherwise noted. A RST Output Voltage Low ( RST Pull-Down Current (I ) RST 1 1 ...

Page 7

PIN FUNCTIONS (TS8 Package/DDB8 Package) V2 (Pin 1/Pin 4): Voltage Input 2. Input for V2 monitor. Select from 3.3V, 2.5V, 1.8V, 1.5V, 1.2V or 1.0V. Refer to Table 1 for details. The greater of V1 also the internal ...

Page 8

LTC2904/LTC2905 BLOCK DIAGRAM LTC2905 POWER DETECT V2 BAND GAP REFERENCE TIMING DIAGRAM V RTX V X RST RST 8 – + RESISTOR NETWORK – + THREE-STATE DECODER Monitor Timing RST UV ...

Page 9

APPLICATIONS INFORMATION Supply Monitoring The LTC2904/LTC2905 are low power, high accuracy dual supply monitors with a common reset output and selectable thresholds. Reset delay is set to a nominal of 200ms for the LTC2904 and is adjustable using an external ...

Page 10

LTC2904/LTC2905 APPLICATIONS INFORMATION Threshold Accuracy Reset threshold accuracy is of the utmost importance in a supply sensitive system. Ideally such a system should not reset while supply voltages are within a specifi ed margin below the rated nominal level. Both ...

Page 11

APPLICATIONS INFORMATION Figure 1 shows the desired delay time as a function of the value of the timer capacitor that should be used: 10000 1000 100 10 1 0.1 10p 100p 1n 10n C (FARAD) TMR Figure 1. Reset Time-Out ...

Page 12

LTC2904/LTC2905 APPLICATIONS INFORMATION The on-resistance as a function of the V voltage (for V > 1V) at room temperature is estimated CC as follows • = Ω MAX – 1 ...

Page 13

TYPICAL APPLICATIONS DC/DC CONVERTER SUPPLY CONTROLLER THREE-STATE 3.3V, 1.2V Dual Supply Monitor with Asymmetric Hysteresis, 5% Tolerance (Supplies Rising), 10% Tolerance (After RST Goes Low) 5V, 3.3V Dual Supply Monitor with Voltage Margining for Automated On-Board Testing 5V 3.3V V1 ...

Page 14

LTC2904/LTC2905 PACKAGE DESCRIPTION 0.61 0.05 (2 SIDES) 2.50 0.05 1.15 0.05 0.25 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE ...

Page 15

... JEDEC PACKAGE REFERENCE IS MO-193 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. TS8 Package ...

Page 16

... Tolerances, 8-Lead SOT-23 and DFN Packages 0.5V Adjustable Threshold, Adjustable RESET Timer and Three Supply Tolerances, 8-Lead SOT-23 and DFN Packages Ultra Low Voltage RESET, 8-Lead SOT-23 and DFN Packages LT 0308 REV C • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2003 29045fc ...

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