LTC2903-1
Precision Quad Supply
Monitor in 6-Lead SOT-23
FEATURES
DESCRIPTIO
Ultralow Voltage Reset: V = 0.5V Guaranteed The LTC 2903-1 monitors up to four supply voltages. The
CC
Monitor Four Inputs Simultaneously common reset output remains low until all four inputs
3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1) have been in compliance for 200ms. Voltage thresholds
5V, 3.3V, 2.5V, 1.8V (LTC2903-B1) maintain 1.5% accuracy over temperature (with respect
5V, 3.3V, 1.8V, 5.2V (LTC2903-C1) to the monitored voltage). The LTC2903-1 features an
3.3V, ADJ, ADJ, ADJ (LTC2903-D1) open-drain RST output with a weak internal pullup.
5V, ADJ, ADJ, ADJ (LTC2903-E1)
Internal supply voltage (V ) is generated from the greater
CC
Guaranteed Threshold Accuracy: 1.5% of
voltage on the V1, V2 inputs. V = V1 for LTC2903-D1 and
CC
Monitored Voltage over Temperature
LTC2903-E1. The RST output is guaranteed to sink at least
10% (A1, B1, C1) and 5% (D1, E1) Undervoltage
5A (V = 0.15V) for V down to 0.5V and will typically
OL CC
Monitoring
conduct current down to 0V. Quiescent current is 20A
Low Supply Current: 20A Typical
typical, making the LTC2903-1 ideal for power conscious
200ms Reset Time Delay
systems. The LTC2903-1 is available in a 6-lead low profile
Active Low Open-Drain RST Output
(1mm) SOT-23 package.
Power Supply Glitch Immunity
, LTC and LT are registered trademarks of Linear Technology Corporation.
TM
Low Profile (1mm) SOT-23 (ThinSOT ) Package ThinSOT is a trademark of Linear Technology Corporation.
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APPLICATIO S
Multivoltage Systems
Optical Networking Systems
Cell Phone Base Stations
Network Servers
TYPICAL APPLICATIO
Low Voltage Reset Pull-Down Performance
vs External Pull-Up Current and Input Supply Voltage
0.10
V = V1 = V2 = V3
IN
5V
0.09 LTC2903-B1
3.3V
DC/DC SYSTEM 0.08
2.5V
CONVERTER LOGIC
0.07
1.8V
20A
0.06
10A
LTC2903-B1
0.05
V1 RST
0.04
C1
5A
0.1F
0.03
GND V4
C2
0.02
2A
0.1F
V2 V3
2903 TA01 0.01
1A
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
V , INPUT SUPPLY VOLTAGE (V)
IN
2903 TA01b
29031f a
1
RESET PIN VOLTAGE (V)
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ULTC2903-1
ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION
(Notes 1, 2, 3)
TOP VIEW
V1, V2 ...................................................... 0.3V to 6.5V
V3 ................................................. 2.7V or (V + 0.3V)
V1 1 6 RST
CC
GND 2 5 V4
V4 (LTC2903-A1, -B1, -D1, -E1) ...............0.3V to 6.5V
V2 3 4 V3
V4 (LTC2903-C1) .................................... 6.5V to 0.3V
RST ........................................................ 0.3V to 6.5V
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
Operating Temperature Range
T = 125C, = 230C/W
JMAX JA
LTC2903C-X1 .......................................... 0C to 70C
LTC2903I-X1 ...................................... 40C to 85C
ORDER PART NUMBER S6 PART MARKING
Storage Temperature Range ................ 65C to 150C
LTC2903CS6-A1 LTAFV
Lead Temperature (Soldering, 10 sec)................. 300C
LTC2903CS6-B1 LTAJN
LTC2903CS6-C1 LTAJQ
LTC2903CS6-D1 LTBMX
LTC2903CS6-E1 LTBMZ
LTC2903IS6-A1 LTAFW
LTC2903IS6-B1 LTAJP
LTC2903IS6-C1 LTAJR
LTC2903IS6-D1 LTBMY
LTC2903IS6-E1 LTBNB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
(LTC2903-A1) The denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T = 25C. V = 3.3V unless otherwise noted.
A CC
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V 3.3V, 10% Reset Threshold V1 Input Threshold 2.871 2.921 2.970 V
RT33
V 2.5V, 10% Reset Threshold V2 Input Threshold 2.175 2.213 2.250 V
RT25
V 1.8V, 10% Reset Threshold V3 Input Threshold 1.566 1.593 1.620 V
RT18
V Adjustable Reset Threshold V4 Input Threshold 0.492 0.500 0.508 V
RTA
(LTC2903-B1) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at
T = 25C. V = 5V unless otherwise noted.
A CC
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V 5V, 10% Reset Threshold V1 Input Threshold 4.350 4.425 4.500 V
RT50
V 3.3V, 10% Reset Threshold V2 Input Threshold 2.871 2.921 2.970 V
RT33
V 2.5V, 10% Reset Threshold V3 Input Threshold 2.175 2.213 2.250 V
RT25
V 1.8V, 10% Reset Threshold V4 Input Threshold 1.566 1.593 1.620 V
RT18
(LTC2903-C1) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at
T = 25C. V = 5V unless otherwise noted.
A CC
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V 5V, 10% Reset Threshold V1 Input Threshold 4.350 4.425 4.500 V
RT50
V 3.3V, 10% Reset Threshold V2 Input Threshold 2.871 2.921 2.970 V
RT33
V 1.8V, 10% Reset Threshold V3 Input Threshold 1.566 1.593 1.620 V
RT18
V 5.2V, 10% Reset Threshold V4 Input Threshold 4.524 4.602 4.680 V
RT52N
29031f a
2
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