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參數(shù)資料
| 型號(hào)： | LTC4216CMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Ultralow Voltage Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 277K |
| 代理商： | LTC4216CMS |
LTC4216
4216f
18
1. Maximum drain-to-source voltage, V
DS(MAX)
The V
DS(MAX)
rating must exceed the maximum load sup-
ply voltage including spikes and ringing.
2. Gate-to-source voltage, V
GS
, overdrive
The absolute maximum rating for V
GS
is typically ±8V for
“l(fā)ogic level” and “sub-logic level” MOSFETs.
3. Drain-to-source resistance, R
DS(ON)
The R
DS(ON)
should be low for low-voltage applications
to allow its drain-to-source voltage, V
DS(ON)
, to be a very
small percentage of the supply voltage.
To begin a design, first specify the maximum operating load
current and load capacitance. Calculate the R
SENSE
value
from Equation (12). The minimum trip current, I
TRIP(MIN)
,
given by Equation (14) should be set to accommodate the
maximum operating load current.
During the start-up cycle, the LTC4216 may operate the
MOSFET in analog current limit, forcing
Δ
V
ACL(TH)
between
32mV to 48mV across R
SENSE
. The minimum inrush current
given by Equation (16) is calculated using the minimum
Δ
V
ACL(TH)
and maximum R
SENSE
value.
The maximum short-circuit current given by Equation (17)
is calculated using the maximum
Δ
V
ACL(TH)
and minimum
R
SENSE
value.
=
(
)
I
V
R
mV
R
INRUSH MIN
ACL THMIN
(
SENSE MAX
SENSE MAX
(
)
,
)
(
)
(
)
=
=
32
(16)
I
V
R
mV
R
SHORT CIRCUIT MAX
ACL THMAX
(
SENSE MIN
SENSE MIN
=
,
)
(
)
(
)
48
Select the FILTER capacitor, C3, based on the slowest
expected charging rate; otherwise, FILTER might time-out
before the load capacitor is fully charged. A value for C3
is calculated based on the maximum time it takes the load
capacitor, C
LOAD
, to charge to its maximum value of load
supply (V
IN(MAX)
). That time is given by:
(17)
t
C
V
I
CHARGE LOAD
LOAD
IN MAX
(
INRUSH MIN
(
)
)
(
)
=
(18)
Rearranging Equation (2) for the circuit breaker response
time, the FILTER capacitor, C3, is given by:
Returning to Equation (2), the circuit breaker response time
is calculated with a chosen C3 and used in conjunction
with V
IN(MAX)
and I
SHORT-CIRCUIT(MAX)
to check the SOA
curves of a prospective MOSFET.
As a numerical design example for the Typical Application,
consider V
IN(MAX)
= 1.8V + 5%, maximum operating load
current = 5A, C
LOAD
= 1000μF. Equation (12) gives R
SENSE
= 4.3m
Ω
. Choose R
SENSE
= 4m
Ω
± 1% tolerance. From
Equations (14) and (16), I
TRIP(MIN)
= 5.3A (> I
LOAD(MAX)
= 5A) and I
INRUSH(MIN)
= 7.9A respectively. Equation (19)
gives C3 = 10nF. To account for errors in C3, FILTER current
(60μA) and FILTER threshold (1.253V), the calculated value
should be multiplied by 1.5, giving the nearest standard
value of C3 = 18nF.
If a short-circuit occurs, a current of up to I
SHORT-
CIRCUIT(MAX)
= 12.1A will flow through the MOSFET for
400μs as dictated by C3 = 18nF in Equation (2). The
MOSFET must be selected based on this criterion and
checked against the SOA curve.
C
t
s
A
V
CHARGE LOAD
3
20
60
1 253
.
=
μ
μ
(
–
)
(
)
(19)
V
CC
Supply RC Network
The LTC4216 has two separate pins, V
CC
and SENSEP, for
supply input and sensing:
1. V
CC
pin for powering the internal circuitry.
2. SENSEP pin, together with the SENSEN pin, for sens-
ing the current flowing from the load supply through the
external sense resistor and N-channel MOSFET to the
output load.
In most hot swap devices, V
CC
and SENSEP are one
common pin, providing the device’s supply and external
MOSFET’s current sensing. However, supply dips due to
output-shorts can potentially trigger the device into an
undervoltage lockout condition, causing the device to
disable and its internal latches to reset.
As bypass capacitors are not allowed on the powered
supply side of the external MOSFET switch residing on
APPLICATIU
W
U
U
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| LTC4216CMS#PBF | 功能描述:IC CNTRLR HOT SWAP 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4216CMS#TRPBF | 功能描述:IC CNTRLR HOT SWAP 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4216IDE | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP |
| LTC4216IDE#PBF | 功能描述:IC CNTRLR HOT SWAP 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4216IDE#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP T/R |
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