LTC2900-2CMS 반도체 회로 부품 판매점
Programmable Quad Supply Monitor with Adjustable Reset Timer
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 Linear Technology |
LTC2900
Programmable Quad Supply
Monitor with Adjustable Reset Timer
FEATURES
s Simultaneously Monitors Four Supplies
s 16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage
Thresholds
s Guaranteed Threshold Accuracy: ±1.5% of
Monitored Voltage Over Temperature
s Low Supply Current: 43µA Typ
s Adjustable Reset Time
s Small MSOP and 3mm × 3mm DFN Packages
s Manual Reset Pin
s Open-Drain RST Output (LTC2900-1)
s Push-Pull RST Output (LTC2900-2)
s Power Supply Glitch Immunity
s Guaranteed RST for VCC ≥ 1V
U
APPLICATIO S
s Desktop and Notebook Computers
s Multivoltage Systems
s Telecom Equipment
s Portable Battery-Powered Equipment
s Network Servers
DESCRIPTIO
The LTC®2900 is a programmable supply monitor for
systems with up to four supply voltages. One of 16 preset
or adjustable voltage monitor combinations can be se-
lected using an external resistor divider connected to the
program pin. The preset voltage thresholds are accurate
to ±1.5% over temperature.
The reset delay time is adjustable using an external
capacitor and the manual reset input may be used with a
momentary switch to issue reset pulses with programmed
duration. Tight voltage threshold accuracy and glitch
immunity ensure reliable reset operation without false
triggering. The RST output is guaranteed to be in the
correct state for VCC down to 1V. The LTC2900-1 features
an open-drain RST output, while the LTC2900-2 has a
push-pull RST output.
The 43µA supply current makes the LTC2900 ideal for
power conscious systems and it may be configured to
monitor less than four inputs. The parts are available in
the 10-lead MSOP and the 10-lead 3mm × 3mm DFN
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Quad Supply Monitor (5V, 3.3V, 2.5V, 1.8V)
DC/DC
CONVERTER
5V
3.3V
2.5V
1.8V
SYSTEM
LOGIC
C1
0.1µF
C2
0.1µF
R1
59k
1%
R2
40.2k
1%
V3 V4
V1
LTC2900-2
V2
VREF
VPG
GND
RST
PBR
CRT
PUSH-BUTTON
CRT
47nF
RESET
2900 TA01
tRST = 216ms
2900f
1
LTC2900
ABSOLUTE AXI U RATI GS (Notes 1, 2, 3)
V1, V2, V3, V4, VPG, PBR ............................. – 0.3V to 7V
RST (LTC2900-1)........................................ – 0.3V to 7V
RST (LTC2900-2).......................... – 0.3V to (V2 + 0.3V)
CRT ............................................. – 0.3V to (VCC + 0.3V)
VREF ............................................. – 0.3V to (VCC + 0.3V)
Reference Load Current (IVREF) ............................ ±1mA
V4 Input Current (– ADJ Mode) ............................ – 1mA
Operating Temperature Range
LTC2900-1C/LTC2900-2C ....................... 0°C to 70°C
LTC2900-1I/LTC2900-2I .................... –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
ORDER PART
NUMBER
V3 1
V1 2
CRT 3
RST 4
PBR 5
TOP VIEW
10 V2
9 V4
8 VREF
7 VPG
6 GND
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 250°C/W
LTC2900-1CMS
LTC2900-2CMS
LTC2900-1IMS
LTC2900-2IMS
MS PART MARKING
LTYJ
LTYL
LTYK
LTYM
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
V3 1
V1 2
CRT 3
RST 4
PBR 5
10 V2
9 V4
8 VREF
7 VPG
6 GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
ORDER PART
NUMBER
LTC2900-1CDD
LTC2900-2CDD
LTC2900-1IDD
LTC2900-2IDD
DD PART MARKING
LABU
LABW
LABV
LABX
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VRT50
VRT33
VRT30
VRT25
VRT18
VRT15
VRTA
VRTAN
VCC
VCCMINP
VREF
VPG
IVPG
IV1
5V, 5% Reset Threshold
3.3V, 5% Reset Threshold
3V, 5% Reset Threshold
2.5V, 5% Reset Threshold
1.8V, 5% Reset Threshold
1.5V, 5% Reset Threshold
ADJ Reset Threshold
– ADJ Reset Threshold
Minimum Internal Operating Voltage
Minimum Required for Programming
Reference Voltage
Programming Voltage Range
VPG Input Current
V1 Input Current
V1 Input Threshold
V1, V2 Input Threshold
V2 Input Threshold
V2, V3 Input Threshold
V3, V4 Input Threshold
V3, V4 Input Threshold
V3, V4 Input Threshold
V4 Input Threshold
RST in Correct Logic State,
VCC Rising Prior to Program
VCC Rising
VCC ≥ 2.3V, IVREF = ±1mA, CREF ≤ 1000pF
VCC ≥ VCCMINP
VPG = VREF
V1 = 5V, IVREF = 12µA, (Note 4)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
4.600
3.036
2.760
2.300
1.656
1.380
0.492
– 18
4.675
3.086
2.805
2.338
1.683
1.403
0.500
0
4.750
3.135
2.850
2.375
1.710
1.425
0.508
18
1
1.192
0
1.210
43
2.42
1.228
VREF
±20
75
V
V
V
V
V
V
V
mV
V
V
V
V
nA
µA
2900f
2
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LTC2900-2CMS
Programmable Quad Supply Monitor with Adjustable Reset Timer - Linear Technology
