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参数资料
| 型号： | LT3845AEFE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 24/26页 |
| 文件大小： | 284K |
| 代理商： | LT3845AEFE#PBF |
LT3845A
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BG: The BG pin is the gate drive for the bottom N-channel
MOSFET. Since very fast high currents are driven from
this pin, connect it to the gate of the power MOSFET
with a short and wide, typically 0.02" width, PCB trace to
minimize inductance.
BOOST: The BOOST pin is the supply for the bootstrapped
gate drive and is externally connected to a low ESR ceramic
boost capacitor referenced to SW pin. The recommended
value of the BOOST capacitor, CBOOST, is at least 50 times
greaterthanthetotalgatecapacitanceofthetopsideMOSFET.
Inmostapplications0.1Fisadequate.Themaximumvoltage
that this pin sees is VIN + VCC, ground referred.
BURST_EN:BurstModeOperationEnablePin.Thispinalso
controls reverse-current inhibit mode of operation. When
the pin voltage is below 0.5V, Burst Mode operation and
reverse-currentinhibitfunctionsareenabled.Whenthepin
voltage is above 0.5V, Burst Mode operation is disabled,
but reverse-current inhibit operation is maintained. In
this mode of operation (BURST_EN = VFB) there is a 1mA
minimum load requirement. Reverse-current inhibit is
disabled when the pin voltage is above 2.5V. This pin is
typicallyshortedtogroundtoenableBurstModeoperation
and reverse-current inhibit, shorted to VFBtodisableBurst
Mode operation while enabling reverse-current inhibit,
and connected to VCC pin to disable both functions. See
Applications Information section.
CSS: The soft-start pin is used to program the supply soft-
start function. Use the following formula to calculate CSS
for a given output voltage slew rate:
CSS = 2A(tSS/1.231V)
The pin should be left unconnected when not using the
soft-start function.
fSET:ThefSETpinprogramstheoscillatorfrequencywithan
external resistor, RSET. The resistor is required even when
supplying external sync clock signal. See the Applications
Information section for resistor value selection details.
PGND: The PGND pin is the high-current ground reference
for internal low side switch driver and the VCC regulator
circuit. Connect the pin directly to the negative terminal
of the VCC decoupling capacitor. See the Application
Information section for helpful hints on PCB layout of
grounds.
SENSE–: The SENSE– pin is the negative input for the
current sense amplifier and is connected to the VOUT side
of the sense resistor for step-down applications.
SENSE+:TheSENSE+pinisthepositiveinputforthecurrent
sense amplifier and is connected to the inductor side of
the sense resistor for step-down applications.
SGND: The SGND pin is the low noise ground reference.
It should be connected to the –VOUT side of the output
capacitors. Careful layout of the PCB is necessary to keep
high currents away from this SGND connection. See the
Application Information section for helpful hints on PCB
layout of grounds.
SHDN: The SHDN pin has a precision IC enable threshold
of 1.35V (rising) with 120mV of hysteresis. It is used to
implement an undervoltage lockout (UVLO) circuit. See
Application Information section for implementing a UVLO
function. When the SHDN pin is pulled below a transistor
VBE (0.7V), a low current shutdown mode is entered, all
internal circuitry is disabled and the VIN supply current
is reduced to approximately 9A. Typical pin input bias
current is <10nA and the pin is internally clamped to 6V.
If the function is not used, this pin may be tied to VIN
through a high value resistor.
SW:ReferenceforVBOOSTSupplyandHighCurrentReturn
for Bootstrapped Switch.
SYNC: The Sync pin provides an external clock input for
synchronization of the internal oscillator. RSET is set such
that the internal oscillator frequency is 10% to 25% below
the external clock frequency. If unused the Sync pin is
connected to SGND. For more information see “Oscillator
Sync” in the Application Information section of this data
sheet. Sync pin not available in PDIP package.
PIN FUNCTIONS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3845AIFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3845AIFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3845AMPFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3845AMPFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LT3845EFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
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