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參數(shù)資料
| 型號(hào)： | LTC2927CDDB#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大小： | 264K |
| 代理商： | LTC2927CDDB#TRM |
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LTC2927
13
2927fb
Final Sanity Checks
The collection of equations below is useful for identifying
unrealizable solutions.
As stated in step 2, the slave supply must nish ramping
before the master signal has reached its nal voltage. This
can be veried by the following equation:
V
R
V
TRACK
TB
TA
MASTER
1
+
<
Here, VTRACK = 0.8V. VMASTER is the nal voltage of the
master signal (VCC if RAMP pin).
It is possible to choose resistor values that require the
LTC2927 to supply more current than the Electrical Char-
acteristics table guarantees. To avoid this condition, check
that ITRACK does not exceed 1mA and IRAMPBUF does not
exceed ±2mA.
To conrm that ITRACK < 1mA, the TRACK pin’s maximum
guaranteed current, verify that:
V
RR
mA
TRACK
TA
TB
< 1
Finally, check that the RAMPBUF pin will not be forced to
sink more than 2mA when it is at 0V or be forced to source
more than 2mA when it is at VMASTER.
V
R
mA and
V
RR
mA
TRACK
TB
MASTER
TA
TB
<
+
<
22
ON Pin Resistive Divider
Check that the ON pin voltage is above the 1.25V maximum
threshold at the lowest possible supply voltage value.
R
V
ONB
ONA
CC MIN
<
()
.
–
125
1
Also check that the supply voltage is above the minimum
LTC2927 operating supply voltage of 2.9V before the ON
pin is above the 1.21V minimum threshold voltage.
Figure 17. Weak Resistive Load
2927 F17
10ms/DIV
1V/DIV
MASTER
SLAVE
R
V
ONB
ONA
<
29
121
1
.
–
For example, if the typical application shown on page 1
has a 3.3V ±10% VIN, the lowest possible operating supply
voltage will be 2.97.
R
V
ONB
ONA
>=
297
125
1 1 376
.
–.
If RONA is 100k then RONB must be greater than 137.6k.
Therefore, 138k is chosen. These values must be checked
to ensure the supply reaches the LTC2927 minimum op-
erating supply voltage of 2.9V before the ON pin is above
the minimum threshold.
138
29
121
1 1 389
.
–.
<=
V
Load Requirements
When the supply is ramped down quickly, either the load
or the supply itself must be capable of sinking enough
current to support the ramp rate. For example, if there
is a large output capacitance on the supply and a weak
resistive load, supplies that do not sink current will have
their falling ramp rate limited by the RC time constant of
the load and the output capacitance. Figure 17 shows the
case when the slave supply does not track the master
near ground.
APPLICATIO S I FOR ATIO
WU
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| LTC2927CTS8#PBF | 制造商:Linear Technology 功能描述:Power Supply 8-Pin TSOT-23 制造商:Linear Technology 功能描述:MS-System Monitor/Other, Cut Tape Single Power Supply Tracking Controller |
| LTC2927CTS8#TR | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC2927CTS8#TRM | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC2927CTS8#TRMPBF | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC2927CTS8#TRPBF | 功能描述:IC POWER SUPPLY CTRLR TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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