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参数资料
| 型号： | LTC3736-2EGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件页数： | 7/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EGN#PBF |
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LTC3736-2
15
37362fb
The MOSFET power dissipations at maximum output
current are:
P
V
IR
V
I
TOP
OUT
IN
OUT MAX
T
DS ON
IN
=+
()
(
)
22
2
ρ
O
OUT MAX
RSS
OSC
BOT
IN
OUT
IN
OUT MA
Cf
P
VV
V
I
()
(
–
=
X
T
DS ON
R
)(
)
2
ρ
Both MOSFETs have I2R losses and the PTOP 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 nearly 100%.
The LTC3736-2 utilizes a nonoverlapping, antishoot-
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-channel
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 (QG)
Figure 4. RDS(ON) vs Temperature
JUNCTION TEMPERATURE (°C)
–50
TNORMALIZED
ON
RESISTANCE
1.0
1.5
150
37362 F04
0.5
0
50
100
2.0
less than 25nC to 30nC (at 4.5VGS) and a turn-off delay
(tD(OFF)) of less than approximately 140ns. However, due
to differences in test and specication methods of various
MOSFET manufacturers, and in the variations in QG and
tD(OFF) withgatedrive(VIN)voltage,theP-channelMOSFET
ultimately should be evaluated in the actual LTC3736-2
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 increases,
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., VIN >
5V) may work ne at lower voltages (e.g., 3.3V). Table 1
shows a selection of P-channel MOSFETs from different
manufacturers that are known to work well in LTC3736-2
applications.
Selecting the N-channel MOSFET is typically easier, since for
a given RDS(ON), the gate charge and turn-on and turn-off
delays are much smaller than for a P-channel MOSFET.
Table 1. Selected P-Channel MOSFETs Suitable for LTC3736-2
Applications
PART
NUMBER
MANUFACTURER
TYPE
PACKAGE
Si7540DP
Siliconix
Complementary
P/N
PowerPak
SO-8
Si9801DY
Siliconix
Complementary
P/N
SO-8
FDW2520C
Fairchild
Complementary
P/N
TSSOP-8
FDW2521C
Fairchild
Complementary
P/N
TSSOP-8
Si3447BDV
Siliconix
Single P
TSOP-6
Si9433BDY
Siliconix
Single P
SO-8
FDC602P
Fairchild
Single P
TSOP-6
FDC606P
Fairchild
Single P
TSOP-6
FDC638P
Fairchild
Single P
TSOP-6
FDW2502P
Fairchild
Dual P
TSSOP-8
FDS6875
Fairchild
Dual P
SO-8
HAT1054R
Hitachi
Dual P
SO-8
NTMD6P02R2-D On Semiconductor
Dual P
SO-8
APPLICATIONS INFORMATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3736EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3736EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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