LTC2930
Configurable Six Supply
Monitor with Adjustable
Reset Timer, Manual Reset
DESCRIPTION
The LTC®2930 is a configurable supply monitor for
systemswithuptosixsupplyvoltages. Oneof16presetor
adjustable voltage monitor combinations can be selected
using an external resistive divider connected to the mode
select pin. The preset voltage thresholds are accurate
to 1.ꢀ5 over temperature. The LTC2930 also features
adjustable inputs with a 0.ꢀV nominal threshold.
FEATURES
■
Simultaneously Monitors Six Supplies
16 User Selectable Combinations of
■
5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and
ꢀdꢁustable Voltage Thresholds
■
Guaranteed 1.5% Threshold ꢀccuracy
■
ꢀdꢁustable Reset Timeout
■
Low Supply Current: 52μꢀ
■
Manual Reset Pin
The reset timeout period is adjustable using an external
capacitor. A reset event may be generated with a manual
reset button on the manual reset input. Tight voltage
threshold accuracy and glitch immunity ensure reliable
reset operation without false triggering. The RST output
■
Power Supply Glitch Immunity
■
Guaranteed RST for V ≥ 1V
CC
■
■
High Temperature Operation to 12ꢀ°C
12-Lead 3mm × 3mm DFN Package
is guaranteed to be in the correct state for V down to 1V
CC
APPLICATIONS
and may be externally pulled up to an external voltage.
■
Desktop and Notebook Computers
The ꢀ2μA supply current makes the LTC2930 ideal for
power conscious systems and it may be configured to
monitor fewer than six inputs.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6967591, 7119714, 7239251.
■
Multivoltage Systems
■
Telecom Equipment
Portable Battery-Powered Equipment
Network Servers
Automotive
■
■
■
TYPICAL APPLICATION
Six Supply Monitor, 5% Threshold
12V, 5V, 3.3V, 1.8V, 1.2V, –5.2V
Voltage Threshold Configuration Table
12V
V1 (V)
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
ꢀ.0
3.3
3.3
3.3
3.3
3.3
3.3
V2 (V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.0
3.0
3.0
2.ꢀ
2.ꢀ
2.ꢀ
2.ꢀ
2.ꢀ
2.ꢀ
V3 (V)
V4 (V)
V5 (V)
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
V6 (V)
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ꢀV
3.3V
1.8V
2.ꢀ
1.8
SYSTEM
LOGIC
2.ꢀ
1.ꢀ
1.2V
–ꢀ.2V
2.ꢀ
ADJ
ADJ
–ADJ
ADJ
–ADJ
ADJ
ADJ
ADJ
1.ꢀ
1.8
21ꢀ0k 487k
1.8
15
15
V1
V2
V3
V4
Vꢀ
V6
ADJ
ADJ
2.ꢀ
124k
15
RST
MR
0.1μF
LTC2930
GND
1.8
ADJ
1.8
121k
15
VREF
1.8
ADJ
–ADJ
ADJ
ADJ
–ADJ
100k
15
100k
15
16.2k
15
CRT
VPG
1.8
MANUAL RESET
= 94ms
C
RT
47nF
1.ꢀ
86.6k
15
t
RST
ADJ
ADJ
2930 TA01
2930fa
1