LTC2904 반도체 회로 부품 판매점
(LTC2904 / LTC2905) Precision Dual Supply Monitors
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 Linear Technology |
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
sn29045 29045fs
1
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.
www.(DNaottaeSsh2e,e3t4,U4.c) om
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
sn29045 29045fs
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LTC2904 data
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[ LTC2904.PDF ]
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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