LTC1727 Linear Technology, LTC1727 Datasheet

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LTC1727

Manufacturer Part Number
LTC1727
Description
Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
CONVERTER
Monitors Three Inputs Simultaneously
Very Low Supply Current: 10 A Typ
200ms Reset Time Delay
Active Low RESET Output
Power Supply Glitch Immunity
Guaranteed RESET for V
or V
LTC1727 Includes Monitor Output for Each Supply
LTC1727: 8-Lead MSOP and SO Packages
LTC1728: 5-Lead SOT-23 Package
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
Network Servers
DC/DC
1.5% Threshold Accuracy Over Temperature
LTC1727-5: 5V, 3.3V and ADJ
LTC1727-2.5: 2.5V, 3.3V and ADJ
LTC1728-5: 5V, 3.3V and ADJ
LTC1728-2.5: 2.5V, 3.3V and ADJ
LTC1728-1.8: 3V, 1.8V and ADJ
CC5
0.1 F
/V
3.3V
5V
1.8V
CC25
0.1 F
/V
CC18
U
1V
CC3
R1
61.9k
1%
R2
100k
1%
5
4
3
1V
U
V
V
V
CC3
CC5
CCA
LTC1728-5
1727/28 TA01
GND
RST
1
2
SYSTEM
LOGIC
DESCRIPTIO
The LTC
systems with multiple supply voltages. Each supply moni-
tor has its own open-drain output for individual supply
monitoring. A common open-drain reset output remains
low until all three supplies have been in compliance for
200ms. Tight 1.5% accuracy specifications and glitch
immunity ensure reliable reset operation without false
triggering.
The LTC1728 is functionally identical to the LTC1727
without the individual monitor outputs.
The RST output is guaranteed to be in the correct state for
V
LTC1728 may also be configured to monitor any one or
two V
requirements.
Very low (10 A typical) supply current makes the LTC1727/
LTC1728 ideal for power conscious systems.
The LTC1727 is available in an 8-lead MSOP or SO
package and the LTC1728 is available in a 5-lead SOT-23
package.
CC5
ADJUSTABLE
, LTC and LT are registered trademarks of Linear Technology Corporation.
5-Lead SOT-23 Packages
SUPPLY
/V
CC
CC25
Triple Supply Monitor with Power Good Output
®
inputs instead of three, depending on system
1727 is a triple supply monitor intended for
Micropower Precision
Triple Supply Monitors
/V
in 8-Lead MSOP and
R1
CC18
(3.3V, 2.5V and Adjustable)
3.3V
2.5V
R2
or V
U
CC3
1
2
3
4
LTC1727/LTC1728
V
V
V
GND
CC3
CC25
CCA
LTC1727-2.5
down to 1V. The LTC1727/
COMP25
COMPA
COMP3
RST
1727/28 TA08
8
7
6
5
R3
10k
R4
10k
POWER
GOOD
SYSTEM
RESET
1

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LTC1727 Summary of contents

Page 1

... CC requirements. Very low (10 A typical) supply current makes the LTC1727/ LTC1728 ideal for power conscious systems. The LTC1727 is available in an 8-lead MSOP or SO package and the LTC1728 is available in a 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. Triple Supply Monitor with Power Good Output ...

Page 2

... COMPA S8 PACKAGE 8-LEAD PLASTIC 125 C, = 150 C/W JMAX JA ORDER S8 PART NUMBER PART MARKING 172725 LTC1727ES8-2.5 727I25 LTC1727IS8-2.5 LTC1727ES8-5 17275 1727I5 LTC1727IS8-5 All except LTC1728-1.8. The = 3.3V CC3 CONDITIONS V Input Threshold CC3 V Input Threshold (5V Version) CC5 V Input Threshold (2.5V Version) CC25 ...

Page 3

... Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: All voltage values are with respect to GND. Note 3: The LTC1727E/LTC1728E are guaranteed to meet specified performance from and are designed, characterized and assured to meet the extended temperature limits of – but are not tested at these temperatures ...

Page 4

... G03 I vs Temperature VCC25 (LTC1727-2.5/LT1728-2.5) 1 3.3V CC3 1 2.5V CC25 V = 3.3V CCA 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 6 – 60 –40 – TEMPERATURE ( Temperature VCC5 (LTC1727-5/LTC1728- CC5 3.3V CC3 V = 3.3V CCA – 60 –40 – TEMPERATURE ( C) 100 ) CC 80 100 1727/28 G06 80 100 ...

Page 5

... Temperature (LTC1728-1.8) 2.845 2.835 2.825 2.815 2.805 2.795 2.785 2.775 2.765 100 – 60 1727/28 G15 LTC1727/LTC1728 V Threshold Voltage CC5 vs Temperature (LTC1727-5/LTC1728-5) 4.750 4.725 4.700 4.675 4.650 4.625 4.600 80 100 –60 –40 – TEMPERATURE ( C) 1727/28 G11 vs Temperature CC3 ...

Page 6

... CC5 CC25 CC18 ceramic capacitor. V (Pin 2/Pin 4): 5V Sense Input and Power Supply CC5 Pin. This pin is used on the LTC1727-5/LTC1728-5 to provide power to the part when the voltage on V greater than the voltage Bypass to ground with CC3 a 0.1 F ceramic capacitor. V (Pin 2/Pin 4): 2 ...

Page 7

... BLOCK DIAGRA CC3 POWER DETECT V / CC5 2 V CC25 V 3 CCA GND 4 LTC1727-5/LTC1727-2.5 – INTERNAL CC – + 200ms PULSE GENERATOR – 200ms DELAY + BANDGAP REFERENCE LTC1727/LTC1728 V CC3 COMP3 V CC3 6 A COMP25/ 7 COMP5 V CC3 RST V CC3 COMPA 1727 BD1 7 ...

Page 8

... LTC1727/LTC1728 W BLOCK DIAGRA CC3 POWER DETECT V / CC5 CC25 V CC18 V 3 CCA GND DIAGRA V RST COMPX 8 LTC1728-5/LTC1728-2.5/LTC1728-1.8 – INTERNAL CC – 200ms PULSE GENERATOR + – + BANDGAP REFERENCE V Monitor Timing CC V RTX CCX t RST CC3 RST ...

Page 9

... U U APPLICATIO S I FOR ATIO Supply Monitoring The LTC1727 is a low power, high accuracy triple supply monitoring circuit with three monitor outputs and a 200ms microprocessor reset output. The LTC1728 is a low power, high accuracy triple supply monitoring circuit with a single 200ms microprocessor reset output ...

Page 10

... CC5 to the voltage on V 25mV and the voltage on V CC3 less than 4.15V. In this manner, the LTC1727-5/ LTC1728-5 will behave as a 3.3V monitor and V capability will be disabled. The V trip point is reenabled when the voltage on V CC5 ...

Page 11

... 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 V (V) CC5 1727/28 F05 Figure 5. RST Output Voltage Characteristics of the Circuit in Figure 4 LTC1727/LTC1728 CC3 /V will always be greater than the trip CC25 CC18 . Likewise, the unused, can CCA CC25 CC18 . V must always be used. Tying V CC3 CC3 and operating off ...

Page 12

... LTC1727/LTC1728 U TYPICAL APPLICATIO S ADJUSTABLE SUPPLY OR DC/DC FEEDBACK DIVIDER ADJUSTABLE SUPPLY 12 Triple Supply Monitor (3.3V, 5V and Adjustable) LTC1728 3.3V V SYSTEM RESET RST CC3 CC5 R1 CCA 2 R2* GND 1727/28 TA03 *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 66.5k Dual Supply Monitor (3.3V and 5V, Defeat V ...

Page 13

... R2* GND 1727/28 TA06 *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 66.5k Using V Tied to DC/DC Feedback Divider CCA 2.9V 35.7k LTC1435 LTC1728 3. CC3 OSENSE 4 2. CC5 CCA 2 22.1k GND ADJUSTABLE 1% RESET TRIP THRESHOLD 2.74V 1727/28 TA07 LTC1727/LTC1728 SYSTEM RESET 1 SYSTEM RESET RST 13 ...

Page 14

... LTC1727/LTC1728 PACKAGE DESCRIPTIO 0.007 (0.18) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.35 – ...

Page 15

... TYP 0.014 – 0.019 (0.355 – 0.483) TYP LTC1727/LTC1728 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1 ...

Page 16

... LTC1727/LTC1728 U TYPICAL APPLICATIO MANUAL RESET BUTTON (NORMALLY OPEN) RELATED PARTS PART NUMBER DESCRIPTION LTC690 5V Supply Monitor, Watchdog Timer and Battery Backup LTC694-3.3 3.3V Supply Monitor, Watchdog Timer and Battery Backup LTC699 5V Supply Monitor and Watchdog Timer LTC1232 5V Supply Monitor, Watchdog Timer and Push-Button Reset LTC1326 Micropower Precision Triple Supply Monitor for 5V, 3 ...

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