LTC2903CS6-A1#TRM Linear Technology, LTC2903CS6-A1#TRM Datasheet - Page 10

• Manufacturer Part Number: LTC2903CS6-A1#TRM
• Description: IC QUAD SPLY MONITOR ADJ SOT23-6
• Manufacturer: Linear Technology
• Type: Multi-Voltage Supervisorr

Specifications of LTC2903CS6-A1#TRM

• Number Of Voltages Monitored: 4
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 1.593V, 2.213V, 2.921V, Adj
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LTC2903CS6-A1; LTC2903CS6-A1

APPLICATIO S I FOR ATIO
current sinking ability for single supply and triple supply-
tracking applications. Figure 2 shows a detailed view of the
reset pin voltage with a 10k pull-up resistor to V1.
The LTC2903-1 supervisors derive their internal supply
voltage (V
V1 and V2 inputs (V
all supply inputs above threshold, the quiescent current
drawn from V
Supply Monitoring
The LTC2903-1 accurately monitors four inputs in a small
6-lead SOT-23 package. The low voltage reset output
includes an integrated 200ms reset delay timer. The reset
line pulls high 200ms after all voltage inputs exceed their
respective thresholds. The reset output remains low dur-
ing power-up, power-down and brownout conditions on
any of the voltage inputs.
LTC2903-1
10
Figure 2. RST Output Voltage with a 10k Pull-Up to V1
(Enlarged Area of Detail)
CC
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
) automatically from the greater voltage on the
0
T
CC
A
0.1
= 25°C
COMPETITION
is 20µA (typ).
0.2 0.3
U
V1 ONLY
CC
PART
= V1 for options D1 and E1). With
0.4
U
V1 (V)
V1 = V2 = V3
0.5
0.6
0.7
W
0.8
0.9 1.0
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U
Triple Adjustable Options (LTC2903-D1, LTC2903-E1)
LTC2903-D1 and LTC2903-E1 provide 3 adjustable in-
puts: V2, V3 and V4. The V1 threshold is 3.086V (3.3V,
5%) for option D1 and 4.675 (5V, 5%) for option E1. For
each supply monitored by an adjustable input, connect an
external resistor divider (R1 and R2) between the positive
voltage being sensed and ground. The tap point for each
divider is then connected to each adjustable input. All
adjustable inputs are compared to an internal 0.5V
reference.
Figure 3 shows how each adjustable input is configured.
Calculate the trip voltage from:
V
TRIP
V4
Figure 3. Setting the Positive Adjustable Trip Point
V
TRIP
R1
R2
=
0 5 1
.
V
LTC2903-A1
0.5V
⎛
⎜
⎝
+
+
–
R
R
2
1
⎞
⎟
⎠
–
+
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