- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄42 > LTC4232CDHC#TRPBF (Linear Technology)IC CTLR HOT SWAP 5A 16-DFN Datasheet資料下載
參數(shù)資料
| 型號： | LTC4232CDHC#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 242K |
| 描述： | IC CTLR HOT SWAP 5A 16-DFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | 服務(wù)器，儲存，通信，嵌入式，消費品 |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 可調(diào) |
| 電源電壓： | 2.9 V ~ 15 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-DFN（5x3） |
| 包裝： | 帶卷 (TR) |
LTC4232
12
4232fa
applicaTions inForMaTion
Power Good Indication
In addition to setting the foldback current limit threshold,
the FB pin is used to determine a power good condition.
The Figure 1 application uses an external resistive divider
on the OUT pin to drive the FB pin. The PG comparator
indicates logic high when OUT pin rises above 10.5V. If the
OUT pin subsequently falls below 10.3V the comparator
toggles low. On the LTC4232 the PG comparator drives
high when the FB pin rises above 1.235V and low when
it falls below 1.215V.
Once the PG comparator is high the GATE pin voltage is
monitored with respect to the OUT pin. Once the GATE
minus OUT voltage exceeds 4.2V the PG pin goes high.
This indicates to the system that it is safe to load the OUT
pin while the MOSFET is completely turned on . The PG
pin goes low when the GATE is commanded off (using
the UV, OV or SENSE pins) or when the PG comparator
drives low.
Design Example
Consider the following design example (Figure 5): V
IN
=
12V, I
MAX
= 5A. I
INRUSH
= 100mA, C
L
= 330礔, V
UVON
=
9.88V, V
OVOFF
= 15.2V, V
PWRGD
= 10.5V. A current limit fault
triggers an automatic restart of the power-up sequence.
As mentioned previously the charge-up time is the out-
put voltage (12V) divided by the output rate of 0.3V/ms
resulting in 40ms. The peak power dissipation of 12V at
100mA (or 1.2W) is within the SOA of the pass MOSFET
for 40ms (see MOSFET SOA curve in the Typical Perfor-
mance Characteristics section).
Next the power dissipated in the MOSFET during overcur-
rent must be limited. The active current limit uses a timer
to prevent excessive energy dissipation in the MOSFET.
The worst-case power dissipation occurs when the voltage
versus current profile of the foldback current limit is at the
maximum. This occurs when the current is 6.1A and the
voltage is one half of the 12V or 6V. See the Current Limit
Sense Voltage vs FB Voltage in the Typical Performance
Characteristics section to view this profile. In order to
survive 36W, the MOSFET SOA dictates a maximum time
of 10ms (see SOA graph). Use the internal 2ms timer
invoked by tying the TIMER pin to INTV
CC
. After the 2ms
timeout the FLT pin needs to pull-down on the UV pin to
restart the power-up sequence.
The values for overvoltage, undervoltage and power good
thresholds using the resistive dividers on the UV, OV and
FB pins match the requirements of turn-on at 9.88V and
turn-off at 15.2V.
The final schematic in Figure 5 results in very few external
components. The pull-up resistor, R1, connects to the
PG pin while the 20k (R2) converts the I
MON
current to a
voltage at a ratio:
V
IMON
= 20[礎(chǔ)/A] " 20k " I
OUT
= 0.4[V/A] " I
OUT
In addition there is a 0.1礔 bypass (C1) on the INTV
CC
pin.
Layout Considerations
In Hot Swap applications where load currents can be 5A,
narrow PCB tracks exhibit more resistance than wider tracks
and operate at elevated temperatures. The minimum trace
width for 1oz copper foil is 0.02" per amp to make sure
the trace stays at a reasonable temperature. Using 0.03"
per amp or wider is recommended. Note that 1oz copper
exhibits a sheet resistance of about 0.5m?square. Small
resistances add up quickly in high current applications.
Figure 5. 5A, 12V Card Resident Application
ADC
226k
C1
0.1礔
20k
12V
140k
20k
R2
20k
4232 F05
C
L
330礔
V
DD
UV
OUT
FB
PG
GATE
GND
I
MON
I
SET
LTC4232
OV
INTV
CC
TIMER
FLT
+
V
OUT
12V
5A
R1
10k
20k
150k
The inrush current is defined by the current required to
charge the output capacitor using the fixed 0.3V/ms GATE
charge-up rate. The inrush current is defined as:
I
INRUSH
=C
L
"
0.3V
ms
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=330礔 "
0.3V
ms
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=100mA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4240IGN#TRPBF | IC CTRLR HOTSWAP CPCI I2C 28SSOP |
| LTC4241IGN#PBF | IC CTRLR HOTSWAP 3.3V AUX 20SSOP |
| LTC4242CUHF#TRPBF | IC CNTRLR HOT SWAP 38-QFN |
| LTC4244CGN-1#TRPBF | IC CTRLR HOTSWAP PCI 20-SSOP |
| LTC4245CG#TRPBF | IC CNTRLR HOT SWAP 36-SSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4232IDHC#PBF | 功能描述:IC CTLR HOT SWAP 5A 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4232IDHC#TRPBF | 功能描述:IC CTLR HOT SWAP 5A 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:CompactPCI Hot Swap Controller with I2C Compatible Interface |
| LTC4240CGN | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240CGN#PBF | 功能描述:IC CTLR HOT SWAP CPCI I2C 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。