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LTC2900-1IDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC2900
2900f
Programmable Quad Supply
Monitor with Adjustable Reset Timer
■
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
■
Low Supply Current: 43µA Typ
■
Adjustable Reset Time
■
Small MSOP and 3mm × 3mm DFN Packages
■
Manual Reset Pin
■
Open-Drain RST Output (LTC2900-1)
■
Push-Pull RST Output (LTC2900-2)
■
Power Supply Glitch Immunity
■
Guaranteed RST for V
CC
≥ 1V
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 V
CC
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.
■
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
GND
R1
59k
1%
R2
40.2k
1%
1.8V
C
RT
47nF
PUSH-BUTTON
RESET
C2
0.1µF
C1
0.1µF
V3 V4
LTC2900-2
CRT
PBR
RST
t
RST
= 216ms
2900 TA01
SYSTEM
LOGIC
DC/DC
CONVERTER
2.5V
3.3V
5V
Quad Supply Monitor (5V, 3.3V, 2.5V, 1.8V)
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC2900
2900f
ORDER PART
NUMBER
MS PART MARKING
LTYJ
LTYL
LTYK
LTYM
T
JMAX
= 125°C, θ
JA
= 250°C/W
V1, V2, V3, V4, V
PG
, 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 (V
CC
+ 0.3V)
V
REF
............................................. –0.3V to (V
CC
+ 0.3V)
Reference Load Current (I
VREF
) ............................ ±1mA
LTC2900-1CMS
LTC2900-2CMS
LTC2900-1IMS
LTC2900-2IMS
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
1
2
3
4
5
V3
V1
CRT
RST
PBR
10
9
8
7
6
V2
V4
V
REF
V
PG
GND
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
(Notes 1, 2, 3)
ORDER PART
NUMBER
DD PART MARKING
LABU
LABW
LABV
LABX
LTC2900-1CDD
LTC2900-2CDD
LTC2900-1IDD
LTC2900-2IDD
T
JMAX
= 125°C, θ
JA
= 43°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT50
5V, 5% Reset Threshold V1 Input Threshold ● 4.600 4.675 4.750 V
V
RT33
3.3V, 5% Reset Threshold V1, V2 Input Threshold ● 3.036 3.086 3.135 V
V
RT30
3V, 5% Reset Threshold V2 Input Threshold ● 2.760 2.805 2.850 V
V
RT25
2.5V, 5% Reset Threshold V2, V3 Input Threshold ● 2.300 2.338 2.375 V
V
RT18
1.8V, 5% Reset Threshold V3, V4 Input Threshold ● 1.656 1.683 1.710 V
V
RT15
1.5V, 5% Reset Threshold V3, V4 Input Threshold ● 1.380 1.403 1.425 V
V
RTA
ADJ Reset Threshold V3, V4 Input Threshold ● 0.492 0.500 0.508 V
V
RTAN
–ADJ Reset Threshold V4 Input Threshold ● –18 0 18 mV
V
CC
Minimum Internal Operating Voltage RST in Correct Logic State, ● 1V
V
CC
Rising Prior to Program
V
CCMINP
Minimum Required for Programming V
CC
Rising ● 2.42 V
V
REF
Reference Voltage V
CC
≥ 2.3V, I
VREF
= ±1mA, C
REF
≤ 1000pF ● 1.192 1.210 1.228 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
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
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V2
V4
V
REF
V
PG
GND
V3
V1
CRT
RST
PBR
3
LTC2900
2900f
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 currents into pins are positive, all voltages are referenced to GND
unless otherwise noted.
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
TEST CIRCUITS
V1
V2
V3
V4
2900 F01
LTC2900-1
RST
I
SOURCE
1µA
V1
V2
V3
V4
2900 F02
LTC2900-1
RST
I
SINK
2.5mA,
100µA
V1
V2
V3
V4
2900 F03
LTC2900-2
RST
I
SOURCE
200µA
Figure 1. RST V
OH
Test Figure 2. RST V
OL
Test Figure 3. Active Pull-Up
RST V
OH
Test
the quiescent current, programming (transient) current and reference load
current.
Note 5: The RST output pin on the LTC2900-1 has an internal pull-up to V2
of typically 6µA. However, an external pull-up resistor 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 LTC2900-2 is
actively
pulled up
to V2.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
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 V
X
Less Than Reset Threshold V
RTX
150 µs
by More Than 1%
V
OL
Output Voltage Low RST 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 (LTC2900-1) I
SOURCE
= 1µA ● V2 – 1 V
(Note 5)
Output Voltage High RST (LTC2900-2) I
SOURCE
= 200µA ● 0.8 • V2 V
(Note 6)
Manual Reset Pin
V
IH
PBR Input Threshold High V
CC
= 3.3V to 5.5V ● 1.6 V
V
IL
PBR Input Threshold Low V
CC
= 3.3V to 5.5V ● 0.4 V
t
PBW
PBR Input Pulse Width V
CC
= 3.3V ● 150 ns
t
PBD
Manual Reset Propagation Delay V
CC
= 3.3V, V
PBR
Falling ● 0.1 1 µs
I
PBR
PBR Pull-Up Current V
PBR
= 0V –10 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC2900-1IDD#TRPBF

Mfr. #:
Buy LTC2900-1IDD#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Quad Voltage Monitor
Lifecycle:
New from this manufacturer.
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