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参数资料
| 型号： | LTC2911CTS8-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件页数： | 2/20页 |
| 文件大小： | 245K |
| 代理商： | LTC2911CTS8-1#TRPBF |
LTC2911
10
2911f
APPLICATIONS INFORMATION
example, the PFO pin may connect to a processor non-
maskable interrupt. When the battery pack voltage drops
below the shutdown threshold, as sensed at PFI, the PFO
pin pulls low to issue an interrupt. Next, the processor
begins shutdown procedures which may include supply
sequencing and/or storage/erasure of system state in
nonvolatile memory.
Threshold Accuracy
Specifying the minimum supply voltage for a system
requires the designer to consider three factors: minimum
supply voltage for proper operation, power supply toler-
ance, and supervisor reset threshold accuracy. Highly
accurate supervisors ease the design challenge by de-
creasing the overall voltage margin required for reliable
system operation.
The reset threshold band and the power supply tolerance
bands should not overlap. This prevents false or nuisance
resetswhenthepowersupplyisactuallywithinitsspecified
tolerance band. The actual reset threshold of supervisors
varies over a specified band. The LTC2911 supervisor
varies ±1.5% around its nominal threshold voltage over
temperature.
Figure 1 illustrates a typical 3.3V monitor. The LTC2911
has ±1.5% reset threshold accuracy. The nearest practical
supervisor trip point is the sum of power supply toler-
ance and the LTC2911 tolerance. So a “5%” threshold
is typically set to –6.5%, excluding resistor errors. Thus
for a 3.3V “5%” threshold, the practical supervisor trip
point is at 3.086V. The threshold is guaranteed to lie in
the band between 3.036V and 3.135V over the operating
temperature range. This 3.135V maximum threshold is at
the lower limit of supply tolerance (3.3V – 5%) to prevent
false tripping.
The system must operate reliably a little below 3.036V
(or 3.3V, –8%), or risk malfunction before a reset signal
is properly issued. A less accurate supervisor increases
the supply voltage tolerance requirements and the risk
of system malfunction. The LTC2911’s ±1.5% threshold
voltage specification minimizes these requirements.
V1 and V2 Supply Monitors
All the LTC2911 options have a V1 threshold equal to
3.086V (3.3V – 6.5%). The V2 thresholds are 4.675V
(5V – 6.5%), 2.338V (2.5V – 6.5%), 1.683V (1.8V – 6.5%)
and 1.122V (1.2V – 6.5%) for options LTC2911-1,
3.3V
3.135V
±1.5%
THRESHOLD
BAND
3.086V
3.036V
REGION OF POTENTIAL MALFUNCTION
–5%
SUPPLY TOLERANCE
IDEAL
SUPERVISOR
THRESHOLD
MINIMUM
RELIABLE
SYSTEM
VOLTAGE
NOMINAL
SUPPLY
VOLTAGE
–6.5%
–8%
2911 F01
Figure 1. 1.5% Threshold Accuracy Improves System Reliability
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