參數(shù)資料
型號(hào)： LTC3736EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking
中文描述： 1 A DUAL SWITCHING CONTROLLER, 825 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-28
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 372K
代理商： LTC3736EUF
14
LTC3808
3808f
which is sensed between the GND and SW pins. The short-
circuit current sense threshold
V
SC
is set approximately
90mV when IPRG is floating (60mV when IPRG is tied low;
150mV when IPRG is tied high). The on-resistance of N-
channel MOSFET is determined by:
R
V
I
DS ON MAX
(
SC
SC PEAK
(
)
)
=
The short-circuit current limit (I
SC(PEAK)
) should be larger
than the I
OUT(MAX)
with some margin to avoid interfering
with the peak current sensing loop. On the other hand, in
order to prevent the MOSFETs from excessive heating and
the inductor from saturation, I
SC(PEAK)
should be smaller
than the minimum value of their current ratings. A reason-
able range is:
I
OUT(MAX)
< I
SC(PEAK)
< I
RATING(MIN)
Therefore, the on-resistance of N-channel MOSFET should
be chosen within the following range:
<
<
V
I
R
V
I
SC
(
RATINGMIN
DS ON
(
SC
OUT MAX
(
)
)
)
where
V
SC
is 90mV, 60mV or 150mV with IPRG being
floated, tied to GND or V
IN
respectively.
The power dissipated in the MOSFET strongly depends on
its respective duty cycles and load current. When the
LTC3808 is operating in continuous mode, the duty cycles
for the MOSFETs are:
Top P-Channel Duty Cycle =
Bottom N-Channel Duty Cycle =
V
V
V
V
V
OUT
IN
IN
OUT
IN
–
The MOSFET power dissipations at maximum output
current are:
P
V
V
I
V
IN
I
R
V
C
f
P
V
V
I
R
TOP
OUT
IN
OUT MAX
(
T
DS ON
(
IN
OUT MAX
–
RSS
BOT
OUT
IN
OUT MAX
(
T
DS ON
(
=
+
=
)
)
(
)
)
)
2
2
2
2
ρ
ρ
Both MOSFETs have I
2
R losses and the P
TOP
equation
includes an additional term for transition losses, which are
largest at high input voltages. The bottom MOSFET losses
are greatest at high input voltage or during a short-circuit
when the bottom duty cycle is 100%.
The LTC3808 utilizes a non-overlapping, anti-shoot-
through gate drive control scheme to ensure that the P-
and N-channel MOSFETs are not turned on at the same
time. To function properly, the control scheme requires
that the MOSFETs used are intended for DC/DC switching
applications. Many power MOSFETs, particularly P-chan-
nel MOSFETs, are intended to be used as static switches
and therefore are slow to turn on or off.
Reasonable starting criteria for selecting the P-channel
MOSFET are that it must typically have a gate charge (Q
G
)
less than 25nC to 30nC (at 4.5V
GS
) and a turn-off delay
(t
D(OFF)
) of less than approximately 140ns. However, due
to differences in test and specification methods of various
MOSFET manufacturers, and in the variations in Q
G
and
t
D(OFF)
with gate drive (V
IN
) voltage, the P-channel MOSFET
ultimately should be evaluated in the actual LTC3808
application circuit to ensure proper operation.
Shoot-through between the P-channel and N-channel
MOSFETs can most easily be spotted by monitoring the
input supply current. As the input supply voltage in-
creases, if the input supply current increases dramatically,
then the likely cause is shoot-through. Note that some
MOSFETs that do not work well at high input voltages (e.g.,
JUNCTION TEMPERATURE (
°
C)
–50
ρ
T
1.0
1.5
150
3808 F02
0.5
0
0
50
100
2.0
Figure 2. R
DS(ON)
vs Temperature
APPLICATIU
W
U
U
相關(guān)PDF資料
PDF描述
LTC3808 16-Bit Bus Transceiver With 3-State Outputs 48-TVSOP -40 to 85
LTC3808EGN No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3736-1 No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3737 No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3737EGN Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3736EUF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱(chēng):LM3754SQDKR
LTC3736EUF#TR 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3736EUF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3736EUF-1 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3736EUF-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
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