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型号： LTC2928IUHF#TRPBF
厂商： Linear Technology
文件页数： 1/32页
文件大小： 0K
描述： IC PWR SUPPLY SEQUENCER 38-QFN
标准包装： 2,500
类型： 序列发生器
监视电压数目： 4
复位： 低有效
复位超时： 最小为 5 ms
电压 - 阀值： 可调节/可选择
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 38-WFQFN 裸露焊盘
供应商设备封装： 38-QFN（5x7）
包装： 带卷 (TR)

LTC2928
Multichannel Power Supply
Sequencer and Supervisor
Easily Configure Power Management
Controls Up to Four Supplies per Device
Cascades for Additional Supplies
Staged Supply Sequencing with
Fault Event Reporting with Diagnostics
Selectable System Shutdown on Fault
1.5% Undervoltage Monitor Accuracy
Overvoltage and/or Fault Indication
Configurable Undervoltage and
Charge Pumped Enable Pins Drive N-Channel
Operates from 2.9V to 16.5V
5mm × 7mm 38-lead QFN and
Network/Telecom Infrastructure
Sequencing for Multiple I/O and Core Voltages
Power Management
FEATURES
■
without Software
■
■
■
Adjustable Time Positions
■
■
■
■
■
Overvoltage Thresholds
■
MOSFETs
■
■
36-lead SSOP Packages
APPLICATIO S
■
■
■
, 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 4843302, 6949965.
TYPICAL APPLICATIO
DESCRIPTIO
The LTC ? 2928 is a four channel cascadable power
supply sequencer and high accuracy supervisor. Sequenc-
ing thresholds, order and timing are configured with just a
few external components, negating the need for PC board
layout or software changes during system development.
Multiple LTC2928s may be easily connected to sequence
an unlimited number of power supplies.
Sequence outputs control supply enable pins or
N-channel pass gates. Precision input comparators with
individual outputs monitor power supply voltages to 1.5%
accuracy. Supervisory functions include undervoltage
and overvoltage monitoring and reporting as well as μ P
reset generation. RST may be forced high to complement
margin testing.
Application faults, whether internally or externally gener-
ated, can shutdown all controlled supplies. The type and
source of faults are reported for diagnosis. Individual
channel controls are available to independently exercise
enable outputs and supervisory functions.
A high voltage input allows the LTC2928 to be powered
from voltages as high as 16.5V. A buffered reference
output permits single negative power supply sequencing
and monitoring operations.
12V
V IN
LTM4600
V OUT
RUN
10k
V IN
LTC3414
V OUT
3.3V
1.2V
3.3V
2.5V
Sequencing Up and Down
V IN
LTC1628
V OUT
RUN
2.5V
1.8V
1.2V
RUN
AUSTIN LYNX
V IN V OUT
Si7894ADP
1.8V
1V/DIV
AXA010AY93
100
12.1k
36.5k
ON
0.1 F
HV CC
EN2
EN1 EN4
EN3
23.2k
51.1k
RT3
V4
COMPLETE
ON
95.3k
24.3k
9.53k
1.5k
3.4k
1 F
RT1 V2
RT2 V3
LTC2928
RT4 RST
DONE OV
V CC FLT
GND MS1 VSEL RTMR PTMR STMR
0.047 F 3300pF
ALL RESISTORS 1%
ON V1
10k
10k
10k
SYSTEM
RESET
FAULT
10k
2928 TA06
DONE
START
SEQUENCE SEQUENCE UP
UP
START
SEQUENCE
DOWN
SEQUENCE
DOWN
COMPLETE
2928 TA07
2928f
1
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