LTC2905 Datasheet PDF - Linear Technology

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LTC2905
Linear Technology

Part Number LTC2905
Description (LTC2904 / LTC2905) Precision Dual Supply Monitors
Page 16 Pages


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FEATURES
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 VCC Auto Select
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 Profile (1mm) SOT-23 (ThinSOTTM) and Plastic
(3mm x 2mm) DUFN Packages
APPLICATIO S
Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
LTC2904/LTC2905
Precision Dual Supply Monitors
with Pin-Selectable Thresholds
DESCRIPTIO
The LTC®2904/LTC2905 are dual supply monitors in-
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 external
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.
wwwT.DYataPShIeCetA4UL.comAPPLICATIO
5V, 3.3V Dual Supply Monitor with 5% Tolerance
5V
DC/DC
SYSTEM
CONVERTER
3.3V
LOGIC
0.1µF
V1 V2
LTC2905
S1 TMR
S2 GND
TOL RST
0.1µF
22nF
29045 TA01
Table 1. Voltage Threshold Programming
V1 V2 S1 S2
5.0 3.3 V1 V1
3.3 2.5 Open GND
3.3 1.8 V1 Open
3.3 1.5 Open V1
3.3 1.2 Open Open
2.5 1.8 GND GND
2.5 1.5 GND Open
2.5 1.2 GND V1
2.5 1.0 V1 GND
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LTC2904/LTC2905
ABSOLUTE AXI U RATI GS (Note 1, 2)
Terminal Voltages
V1, V2 ..................................................... –0.3V to 7V
S1, S2, TOL .............................. –0.3V to (VCC +0.3V)
RST ......................................................... –0.3V to 7V
RST (LTC2904) ....................................... –0.3V to 7V
TMR (LTC2905) ...................................... –0.3V to 7V
Operating Temperature Range
LTC2904C/LTC2905C ................................ 0°C to 70°C
LTC2904I/LTC2905I ..............................–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
GND 1
8 TOL
RST 2
7 S1
9
RST/TMR* 3
6 S2
V2 4
5 V1
LTC2904CDDB
LTC2904IDDB
LTC2905CDDB
LTC2905IDDB
DDB8 PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
EXPOSED PAD IS GND (PIN 9),
MUST BE SOLDERED TO PCB
* RST FOR LTC2904
TMR FOR LTC2905
TJMAX = 125°C, θJA = 250°C/W
DDB8 PART MARKING
LBCZ
LBDB
LTAJF
LBCY
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
V2 1
RST/TMR* 2
RST 3
GND 4
8 V1
7 S2
6 S1
5 TOL
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
* RST FOR LTC2904
TMR FOR LTC2905
TJMAX = 125°C, θJA = 250°C/W
ORDER PART
NUMBER
LTC2904CTS8
LTC2904ITS8
LTC2905CTS8
LTC2905ITS8
TS8 PART MARKING
LTBCJ
LTBCK
LTAJD
LTAJE
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V1 = 2.5V, V2 = 1V, S1 = TOL = V1, S2 = 0V, unless otherwise noted.
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SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VRT50
5V, 5% Reset Threshold
5V, 7.5% Reset Threshold
5V, 10% Reset Threshold
V1 Input Threshold
4.600
4.475
4.350
4.675
4.550
4.425
4.750
4.625
4.500
V
V
V
VRT33
3.3V, 5% Reset Threshold
3.3V, 7.5% Reset Threshold
3.3V, 10% Reset Threshold
V1, V2 Input Threshold
3.036
2.954
2.871
3.086
3.003
2.921
3.135
3.053
2.970
V
V
V
VRT25
2.5V, 5% Reset Threshold
2.5V, 7.5% Reset Threshold
2.5V, 10% Reset Threshold
V1, V2 Input Threshold
2.300
2.238
2.175
2.338
2.275
2.213
2.375
2.313
2.250
V
V
V
VRT18
1.8V, 5% Reset Threshold
1.8V, 7.5% Reset Threshold
1.8V, 10% Reset Threshold
V2 Input Threshold
1.656
1.611
1.566
1.683
1.638
1.593
1.710
1.665
1.620
V
V
V
VRT15
1.5V, 5% Reset Threshold
1.5V, 7.5% Reset Threshold
1.5V, 10% Reset Threshold
V2 Input Threshold
1.380
1.343
1.305
1.403
1.365
1.328
1.425
1.388
1.350
V
V
V
VRT12
1.2V, 5% Reset Threshold
1.2V, 7.5% Reset Threshold
1.2V, 10% Reset Threshold
V2 Input Threshold
1.104
1.074
1.044
1.122
1.092
1.062
1.140
1.110
1.080
V
V
V
VRT10
1V, 5% Reset Threshold
1V, 7.5% Reset Threshold
1V, 10% Reset Threshold
V2 Input Threshold
0.920
0.895
0.870
0.935
0.910
0.885
0.950
0.925
0.900
V
V
V
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LTC2904/LTC2905
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V1 = 2.5V, V2 = 1V, S1 = TOL = V1, S2 = 0V, unless otherwise noted.
(Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCCMIN
Minimum Internal Operating Voltage (Note 2) RST in Correct Logic State
1
IV1 V1 Input Current
Includes Input Current to Three-State Pins
65 130
IV2 V2 Input Current
0.4 1.0
ITMR(UP)
TMR Pull-Up Current
(LTC2905)
VTMR = 0V
–1.5 –2.1 –2.7
ITMR(DOWN) TMR Pull-Down Current (LTC2905)
VTMR = 1.4V
1.5 2.1 2.7
tRST Reset Time-Out Period (LTC2904)
140 200 260
tRST
Reset Time-Out Period
(LTC2905)
CTMR = 22nF
140 200 260
tUV Vx Undervoltage Detect to
RST or RST
Vx Less than Reset Threshold VRTX
by More than 1%
150
V
µA
µA
µA
µA
ms
ms
µs
VOL Output Voltage Low RST, RST
I = 2.5mA
I = 100µA; V1 = 1V (RST Only)
0.15 0.4
V
0.05 0.3
V
VOH Output Voltage High RST, RST
(Notes 2, 5)
I = –1µA
VCC–1
V
Three-State Inputs S1, S2, TOL
VIL Low Level Input Voltage
VIH High Level Input Voltage
VZ
Pin Voltage when Left in Open State
I = –10µA
I = 0µA
I = 10µA
0.4
1.4
0.7
0.9
1.1
V
V
V
V
V
IVPG Programming Input Current (Note 6)
±25 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The greater of V1, V2 is the internal supply voltage (VCC).
Note 3: All currents into pins are positive; all voltages are referenced to
wwwG.DNaDtauSnhleesest4oUth.ecrowmise noted.
Note 4: For reset thresholds test conditions refer to the voltage threshold
programming table in the Applications Information section.
Note 5: The output pins RST and RST have an internal pull-up to VCC of
typically –6µA. However, an external pull-up resistor may be used when
faster rise time is required or for VOH voltages greater than VCC.
Note 6: The input current to the three-state input pins are the pull-up and
the pull-down current when the pins are either set to V1 or GND
respectively. In the open state, the maximum leakage current to V1 or GND
permissible is 10µA.
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LTC2904/LTC2905
TYPICAL PERFOR A CE CHARACTERISTICS
Specifications are at TA = 25°C unless otherwise noted.
5V Threshold Voltage vs
Temperature
4.75
4.70 5%
4.65
4.60
4.55 7.5%
4.50
4.45
10%
4.40
4.35
–50 –25 0 25 50
TEMPERATURE (°C)
75 100
29045 G01
1.8V Threshold Voltage vs
Temperature
1.705
1.685
5%
1.665
1.645
7.5%
1.625
1.605
10%
1.585
www.DataSheet4U.com
1.565
–50 –25 0 25 50
TEMPERATURE (°C)
75 100
29045 G04
1V Threshold Voltage vs
Temperature
0.950
0.940
0.930
5%
0.920
0.910
7.5%
0.900
0.890
0.880
10%
0.870
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
29045 G07
3.3V Threshold Voltage vs
Temperature
3.120
5%
3.070
3.020
7.5%
2.970
2.920
10%
2.870
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
29045 G02
1.5V Threshold Voltage vs
Temperature
1.425
1.405
5%
1.385
1.365
7.5%
1.345
1.325
10%
1.305
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
29045 G05
IV1 vs Temperature
21.5
V1 = 5V
V2 = 3.3V
21.0 S1 = S2 = TOL = 1.4V
20.5
20.0
19.5
19.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
29045 G08
4
2.5V Threshold Voltage vs
Temperature
2.375
5%
2.325
2.275
7.5%
2.225
10%
2.175
–50 –25 0 25 50
TEMPERATURE (°C)
75 100
29045 G03
1.2V Threshold Voltage vs
Temperature
1.135
1.125
1.115
5%
1.105
1.095
7.5%
1.085
1.075
1.065
10%
1.055
1.045
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
29045 G06
IV2 vs Temperature
1.8
V1 = 5V
V2 = 3.3V
1.7 S1 = S2 = TOL = 1.4V
1.6
1.5
1.4
1.3
1.2
–50 –25
0
25
50 75 100
TEMPERATURE (°C)
29045 G09
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