參數(shù)資料
型號： LTC4260IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝： 0.150 INCH, PLASTIC, SSOP-24
文件頁數(shù)： 15/28頁
文件大?。?/td> 266K
代理商： LTC4260IGN
LTC4260
15
4260f
Gate Pin Voltage
A curve of gate drive vs V
DD
is shown in the Typical
Performance curves. At the minimum input supply volt-
age of 8.5V, the minimum gate drive voltage is 4.5V.
When the input supply voltage is higher than 20V, the gate
drive is at least 10V and a regular N-FET can be used. In
applications over a 8.5V to 20V range, a logic level N-FET
must be used to maintain adequate gate enhancement.
The GATE pin is clamped at a typical value of 15V above
the SOURCE pin.
Configuring the GPIO Pin
Table 3 describes the possible states of the GPIO pin using
the control register bits A6 and A7. At power-up, the
default state is for the GPIO pin to go high impedance when
power is good (FB pin greater than 3.5V). Other uses for
the GPIO pin are to pull down when power is good, a
general purpose output and a general purpose input.
Compensating the Active Current Loop
The active current limit circuit is compensated using the
resistor R6 and the slew rate capacitor C1. The value for C1
is calculated to limit the inrush current. The suggested
value for R6 is 100k. This value should work for most pass
FETs (Q1). If the gate capacitance of Q1 is very small then
the best method to compensate the loop is to add a
≈
10nF
capacitor between the GATE and SOURCE terminals.
Supply Transients
The LTC4260 is designed to ride through supply transients
caused by load steps. If there is a shorted load and the
parasitic inductance back to the supply is greater than
0.5
μ
H, there is a chance that the supply could collapse
before the active current limit circuit brings down the
GATE pin. In this case the undervoltage monitors turn off
the pass FET. The undervoltage lockout circuit has a 5
μ
s
filter time after V
DD
drops below 7.5V. The UV pin reacts
in 2
μ
s to shut the GATE off, but it is recommended to add
a filter capacitor C
F
to prevent unwanted shutdown caused
by short transient. Eventually either the UV pin or the
undervoltage lockout responds to bring the current under
control before the supply completely collapses.
Supply Transient Protection
The LTC4260 is 100% tested and guaranteed to be safe
from damage with supply voltages up to 100V. However,
spikes above 100V may damage the part. During a short-
circuit condition, the large change in currents flowing
through the power supply traces can cause inductive
voltage spikes which could exceed 100V. To minimize the
spikes, the power trace inductance should be minimized
by using wider traces or heavier trace plating. Adding a
snubber circuit will dampen the voltage spikes. It is built
using a 100
resistor in series with a 0.1
μ
F capacitor
between V
DD
and GND. A surge suppressor, Z1 in Figure 1,
at the input will clamp the voltage spikes.
Design Example
As a design example, take the following specifications: V
IN
= 48V, I
MAX
= 5A, I
INRUSH
= 1A, C
L
= 330
μ
F, V
UVON
= 43V,
V
UVOFF
= 38.5V, V
OVOFF
= 70V, V
PWRGDUP
= 46V, V
PWRGDDN
= 45V and I
2
C
ADDRESS
= 1010011. The selection of the
sense resistor, R
S
, is set by the overcurrent threshold of
50mV:
R
mV
I
mV
A
5
S
MAX
=
=
=
50
50
0 010
.
The FET should be sized to handle the power dissipation
during the inrush charging of the output capacitor C
OUT
.
The method used to determine the power is the principle:
E
C
= Energy in C
L
= Energy in Q1
Thus:
E
C
= 1/2 CV
2
= 1/2(0.33mF)(48V)
2
= 0.38J
Calculate the time it takes to charge up C
OUT
:
t
C
I
INRUSH
V
F
1
V
A
ms
CHARGUP
L
IN
=
=
μ
=
330
48
16
The average power dissipated in the FET:
P
E
t
J
ms
W
DISS
C
CHARGUP
=
=
0 38
16
24
.
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4260IGN#PBF 功能描述:IC CTLR HOT SWAP I2C 24-SSOP 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)
LTC4260IGN#TRPBF 功能描述:IC HOT SWAP CNTRL I2C 24-SSOP 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)
LTC4260ISW 制造商:LINER 制造商全稱:Linear Technology 功能描述:Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260ISW#PBF 功能描述:IC HOT SWAP CNTRL I2C 24-SOIC 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)
LTC4260ISW#TRPBF 功能描述:IC HOT SWAP CNTRL I2C 24-SOIC 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)
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