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LTC2902-1IGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC2902
2902f
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Programmable Quad Supply
Monitor with Adjustable Reset Timer
and Supply Tolerance
■
Simultaneously Monitors Four Supplies
■
16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage
Thresholds
■
Guaranteed Threshold Accuracy: ±1.5% of Monitored
Voltage Over Temperature
■
Selectable Supply Tolerance: 5%, 7.5%,
10%, 12.5% Below Monitored Voltage
■
Low Supply Current: 43µA Typ
■
Adjustable Reset Time
■
RESET Disable Pin for Margining Applications
■
Open-Drain RST Output (LTC2902-1)
■
Push-Pull RST Output (LTC2902-2)
■
Individual Nondelayed Monitor Outputs for Each Supply
■
Power Supply Glitch Immunity
■
Guaranteed RESET for V
CC
≥ 1V
The LTC
®
2902 is a programmable supply monitor for sys-
tems with up to four supply voltages. One of 16 preset or
adjustable voltage monitor combinations can be selected
using an external resistor divider connected to the pro-
gram pin. The preset voltage thresholds are digitally pro-
grammable to 5%, 7.5%, 10% or 12.5% below the nomi-
nal operating voltage, and are accurate to 1.5% over tem-
perature. All four voltage comparator outputs are con-
nected to separate pins for individual supply monitoring.
The reset delay time is adjustable using an external
capacitor. 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 V
CC
down to 1V and may be disabled
during supply margin testing. The LTC2902-1 features
an open-drain RST output, while the LTC2902-2 has a
push-pull RST output.
The 43µA supply current makes the LTC2902 ideal for power
conscious systems and the part may be configured to
monitor less than four inputs. The LTC2902-1/LTC2902-2
are available in the 16-lead narrow SSOP package.
Quad Supply Monitor with Adjustable Tolerance (5V, 3.3V, 2.5V, 1.8V)
■
Desktop and Notebook Computers
■
Multivoltage Systems
■
Telecom Equipment
■
Portable Battery-Powered Equipment
■
Network Servers
, LTC and LT are registered trademarks of Linear Technology Corporation.
V1
V2
V
REF
V
PG
COMP1
COMP2
COMP3
COMP4
RST
RDIS
T0
T1
GND
10
11
R1
59k
1%
R3
10k
POWER
GOOD
R2
40.2k
1%
12
7
9
8
6
15
1
16
2
133
14
4
5
C
RT
47nF
C2
0.1µF
C1
0.1µF
V4V3
LTC2902-2
CRT
t
RST
= 216ms
MARGIN
TOLERANCE = 5%
2902 TA01
DC/DC
CONVERTER
1.8V
2.5V
3.3V
5V
SYSTEM
LOGIC
2
LTC2902
2902f
ORDER PART
NUMBER
GN16 PART MARKING
29021
29022
29021I
29022I
T
JMAX
= 125°C, θ
JA
= 130°C/W
(Notes 1, 2, 3)
V1, V2, V3, V4, V
PG
..................................... –0.3V to 7V
RST (LTC2902-1)........................................ –0.3V to 7V
RST (LTC2902-2).......................... –0.3V to (V2 + 0.3V)
COMPX, RDIS ............................................. –0.3V to 7V
T0, T1 .......................................... –0.3V to (V
CC
+ 0.3V)
CRT ............................................. –0.3V to (V
CC
+ 0.3V)
V
REF
............................................. –0.3V to (V
CC
+ 0.3V)
Reference Load Current (I
VREF
) ............................ ±1mA
V4 Input Current (–ADJ Mode) ............................ –1mA
Operating Temperature Range
LTC2902-1C/LTC2902-2C ....................... 0°C to 70°C
LTC2902-1I/LTC2902-2I .................... –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
LTC2902-1CGN
LTC2902-2CGN
LTC2902-1IGN
LTC2902-2IGN
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
COMP3
COMP1
V3
V1
CRT
RST
T0
RDIS
COMP2
COMP4
V2
V4
V
REF
V
PG
GND
T1
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT50
5V, 5% Reset Threshold V1 Input Threshold ● 4.600 4.675 4.750 V
5V, 7.5% Reset Threshold
● 4.475 4.550 4.625 V
5V, 10% Reset Threshold
● 4.350 4.425 4.500 V
5V, 12.5% Reset Threshold
● 4.225 4.300 4.375 V
V
RT33
3.3V, 5% Reset Threshold V1, V2 Input Threshold ● 3.036 3.086 3.135 V
3.3V, 7.5% Reset Threshold
● 2.954 3.003 3.053 V
3.3V, 10% Reset Threshold
● 2.871 2.921 2.970 V
3.3V, 12.5% Reset Threshold
● 2.789 2.838 2.888 V
V
RT30
3V, 5% Reset Threshold V2 Input Threshold ● 2.760 2.805 2.850 V
3V, 7.5% Reset Threshold
● 2.685 2.730 2.775 V
3V, 10% Reset Threshold
● 2.610 2.655 2.700 V
3V, 12.5% Reset Threshold
● 2.535 2.580 2.625 V
V
RT25
2.5V, 5% Reset Threshold V2, V3 Input Threshold ● 2.300 2.338 2.375 V
2.5V, 7.5% Reset Threshold
● 2.238 2.275 2.313 V
2.5V, 10% Reset Threshold
● 2.175 2.213 2.250 V
2.5V, 12.5% Reset Threshold
● 2.113 2.150 2.188 V
V
RT18
1.8V, 5% Reset Threshold V3, V4 Input Threshold ● 1.656 1.683 1.710 V
1.8V, 7.5% Reset Threshold
● 1.611 1.638 1.665 V
1.8V, 10% Reset Threshold
● 1.566 1.593 1.620 V
1.8V, 12.5% Reset Threshold
● 1.521 1.548 1.575 V
V
RT15
1.5V, 5% Reset Threshold V3, V4 Input Threshold ● 1.380 1.403 1.425 V
1.5V, 7.5% Reset Threshold
● 1.343 1.365 1.388 V
1.5V, 10% Reset Threshold
● 1.305 1.328 1.350 V
1.5V, 12.5% Reset Threshold
● 1.268 1.290 1.313 V
V
RTA
ADJ, 5% Reset Threshold V3, V4 Input Threshold ● 0.492 0.500 0.508 V
ADJ, 7.5% Reset Threshold
● 0.479 0.487 0.494 V
ADJ, 10% Reset Threshold
● 0.466 0.473 0.481 V
ADJ, 12.5% Reset Threshold
● 0.453 0.460 0.467 V
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 3)
ELECTRICAL CHARACTERISTICS
3
LTC2902
2902f
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 3)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: The greater of V1, V2 is the internal supply voltage (V
CC
).
Note 4: Under static no-fault conditions, V1 will necessarily supply quiescent
current. If at any time V2 is larger than V1, V2 must be capable of supplying
the quiescent current, programming (transient) current and reference load
current.
Note 5: The output pins RST and COMPX have internal pull-ups to V2 of
typically 6µA. However, external pull-up resistors may be used when faster
rise times are required or for V
OH
voltages greater than V2.
Note 6: The push-pull RST output pin on the LTC2902-2 is
actively
pulled up
to V2.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RTAN
–ADJ Reset Threshold V4 Input Threshold ● –18 0 18 mV
V
CC
Minimum Internal Operating Voltage RST, COMPX in Correct Logic State; ● 1V
V
CC
Rising Prior to Program
V
CCMINP
Minimum Required for Programming V
CC
Rising ● 2.42 V
V
CCMINC
Minimum Required for Comparators V
CC
Falling ● 2.32 V
V
REF
Reference Voltage V
CC
≥ 2.3V, I
VREF
= ±1mA, C
REF
≤ 1000pF
T0 Low, T1 Low ● 1.192 1.210 1.228 V
T0 Low, T1 High
● 1.160 1.178 1.195 V
T0 High, T1 Low ● 1.128 1.146 1.163 V
T0 High, T1 High
● 1.096 1.113 1.130 V
V
PG
Programming Voltage Range V
CC
≥ V
CCMINP
● 0V
REF
V
I
VPG
V
PG
Input Current V
PG
= V
REF
● ±20 nA
I
V1
V1 Input Current V1 = 5V, I
VREF
= 12µA, (Note 4) ● 43 75 µA
I
V2
V2 Input Current V2 = 3.3V ● 0.8 2 µA
I
V3
V3 Input Current V3 = 2.5V ● 0.52 1.2 µA
V3 = 0.55V (ADJ Mode) –15 15 nA
I
V4
V4 Input Current V4 = 1.8V ● 0.34 0.8 µA
V4 = 0.55V (ADJ Mode)
● –15 15 nA
V4 = –0.05V (–ADJ Mode) ● –15 15 nA
I
CRT(UP)
CRT Pull-Up Current V
CRT
= 0V ● –1.4 –2 –2.6 µA
I
CRT(DN)
CRT Pull-Down Current V
CRT
= 1.3V ● 10 20 30 µA
t
RST
Reset Time-Out Period C
RT
= 1500pF ● 579 ms
t
UV
V
X
Undervoltage Detect to RST or COMPX V
X
Less Than Reset Threshold V
RTX
150 µs
by More Than 1%
V
OL
Output Voltage Low RST, COMPX I
SINK
= 2.5mA; V1 = 3V, V2 = 3V; ● 0.15 0.4 V
V3, V4 = 0V; V
PG
= 0V
I
SINK
= 100µA; V2 = 1V; V1, V3, V4 = 0V ● 0.05 0.3 V
I
SINK
= 100µA; V1 = 1V; V2, V3, V4 = 0V ● 0.05 0.3 V
V
OH
Output Voltage High RST, COMPX (Note 5) I
SOURCE
= 1µA ● V2 – 1 V
V
OH
Output Voltage High RST (LTC2902-2) I
SOURCE
= 200µA ● 0.8 • V2 V
(Note 6)
Digital Inputs T0, T1, RDIS
V
IL
T0, T1 Low Level Input Voltage V
CC
= 3.3V to 5.5V ● 0.3V
CC
V
V
IH
T0, T1 High Level Input Voltage V
CC
= 3.3V to 5.5V ● 0.7V
CC
V
I
INTOL
T0, T1 Input Current T0 = 0V, T1 = V
CC
● ±0.1 ±1 µA
V
IL
RDIS Input Threshold Low V
CC
= 3.3V to 5.5V ● 0.4 V
V
IH
RDIS Input Threshold High V
CC
= 3.3V to 5.5V ● 1.6 V
I
RDIS
RDIS Pull-Up Current V
RDIS
= 0V –10 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC2902-1IGN#PBF

Mfr. #:
Buy LTC2902-1IGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Quad Monitor w/RST Disable, TOL Select
Lifecycle:
New from this manufacturer.
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