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参数资料
| 型号： | ADM1169ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/36页 |
| 文件大小： | 0K |
| 描述： | IC SEQUENCER/SUPERVISOR 40LFCSP |
| 标准包装： | 1 |
| 系列： | Super Sequencer® |
| 应用： | 电源监控器，序列发生器 |
| 输入电压： | 3 V ~ 14.4 V |
| 电源电压： | 3 V ~ 14.4 V |
| 电流 - 电源： | 4.2mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-WQ（6x6） |
| 包装： | 托盘 |
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Data Sheet
SUPPLY MARGINING
OVERVIEW
It is often necessary for the system designer to adjust supplies,
either to optimize their level or force them away from nominal
values to characterize the system performance under these
conditions. This is a function typically performed during an
in-circuit test (ICT), such as when a manufacturer wants to
guarantee that a product under test functions correctly at
nominal supplies minus 10%.
OPEN-LOOP SUPPLY MARGINING
The simplest method of margining a supply is to implement an
open-loop technique (see Figure 32). A popular way to do this
is to switch extra resistors into the feedback node of a power
module, such as a dc-to-dc converter or low dropout regulator
(LDO). The extra resistor alters the voltage at the feedback or
trim node and forces the output voltage to margin up or down
by a certain amount.
The ADM1169 can perform open-loop margining for up to four
supplies. The four on-board voltage DACs (DAC1 to DAC4) can
drive into the feedback pins of the power modules to be margined.
The simplest circuit to implement this function is an attenuation
resistor that connects the DACx pin to the feedback node of a
dc-to-dc converter. When the DACx output voltage is set equal
to the feedback voltage, no current flows into the attenuation
resistor, and the dc-to-dc converter output voltage does not change.
Taking DACx above the feedback voltage forces current into the
feedback node, and the output of the dc-to-dc converter is forced
VIN
V OUT
ADM1169
to fall to compensate for this. The dc-to-dc converter output can be
forced high by setting the DACx output voltage lower than the
feedback node voltage. The series resistor can be split in two, and
the node between them can be decoupled with a capacitor to
ground. This can help to decouple any noise picked up from the
board. Decoupling to a ground local to the dc-to-dc converter is
recommended.
The ADM1169 can be commanded to margin a supply up or
down over the SMBus by updating the values on the relevant
DAC output.
CLOSED-LOOP SUPPLY MARGINING
A more accurate and comprehensive method of margining is to
implement a closed-loop system (see Figure 33). The voltage on
the rail to be margined can be read back to accurately margin the
rail to the target voltage. The ADM1169 incorporates all the
circuits required to do this, with the 12-bit successive
approximation ADC used to read back the level of the
supervised voltages, and the six voltage output DACs,
section, used to adjust supply levels. These circuits can be used
along with other intelligence, such as a microcontroller, to
implement a closed-loop margining system that allows any dc-to-
dc converter or LDO supply to be set to any voltage, accurate to
within ±0.5% of the target.
MICROCONTROLLER
ADM1169
OUTPUT
DC-TO-DC
CONVERTER
FEEDBACK
R1
ATTENUATION
RESISTOR, R3
DACx
DAC
DEVICE
CONTROLLER
(SMBus)
GND
R2
PCB
TRACE NOISE
DECOUPLING
CAPACITOR
Figure 32. Open-Loop Margining System Using the ADM1169
MICROCONTROLLER
VIN
ADM1169
DC-TO-DC
VH/VPx/VXx
CONVERTER
OUTPUT
ATTENUATION
RESISTOR, R3
MUX
ADC
FEEDBACK
GND
R1
R2
DACx
PCB
TRACE NOISE
DAC
DEVICE
CONTROLLER
(SMBus)
DECOUPLING
CAPACITOR
Figure 33. Closed-Loop Margining System Using the ADM1169
Rev. A | Page 23 of 36
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| ADM1169ASTZ | 功能描述:IC SEQUENCER/SUPERVISOR 32LQFP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:Super Sequencer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM1169ASTZ-RL7 | 功能描述:IC SEQUENCER/SUPERVISOR 32LQFP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:Super Sequencer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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