參數(shù)資料
型號(hào)： LM20133
廠商： National Semiconductor Corporation
英文描述： 3A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
中文描述： 3A條的PowerWise㈢同步降壓穩(wěn)壓器的輸入同步
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 618K
代理商： LM20133
go low. Typical values for the PGOOD resistor are on the or-
der of 100 k
or less. To avoid false tripping during transient
glitches the PGOOD pin has 16 μs of built in deglitch time to
both rising and falling edges.
UVLO
The LM20133 has a built-in under-voltage lockout protection
circuit that keeps the device from switching until the input
voltage reaches 2.7V (typical). The UVLO threshold has 45
mV of hysteresis that keeps the device from responding to
power-on glitches during start up. If desired the turn-on point
of the supply can be changed by using the precision enable
pin and a resistor divider network connected to V
IN
as shown
in
Figure 6
in the design guide.
THERMAL PROTECTION
Internal thermal shutdown circuitry is provided to protect the
integrated circuit in the event that the maximum junction tem-
perature is exceeded. When activated, typically at 160°C, the
LM20133 tri-states the power FETs and resets soft start. After
the junction cools to approximately 150°C, the part starts up
using the normal start up routine. This feature is provided to
prevent catastrophic failures from accidental device over-
heating.
LIGHT LOAD OPERATION
The LM20133 offers increased efficiency when operating at
light loads. Whenever the load current is reduced to a point
where the inductor ripple current is greater than two times the
load current, the part will enter the diode emulation mode
preventing significant negative inductor current. The point at
which this occurs is the critical conduction boundary and can
be calculated by the following equation:
Several diagrams are shown in
Figure 1
illustrating continu-
ous conduction mode (CCM), discontinuous conduction
mode, and the boundary condition.
It can be seen that in diode emulation mode, whenever the
inductor current reaches zero the SW node will become high
impedance. Ringing will occur on this pin as a result of the LC
tank circuit formed by the inductor and the parasitic capaci-
tance at the node. If this ringing is of concern an additional
RC snubber circuit can be added from the switch node to
ground.
At very light loads, usually below 100 mA, several pulses may
be skipped in between switching cycles, effectively reducing
the switching frequency and further improving light-load effi-
ciency.
11
www.national.com
L
相關(guān)PDF資料
PDF描述
LM20133MH 3A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
LM20133MHE 3A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
LM20133MHX 3A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
LM20134 4A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
LM20134MH 4A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM20133_08 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:3A, PowerWise㈢ Synchronous Buck Regulator with Input Synchronization
LM20133EVAL 功能描述:電源管理IC開(kāi)發(fā)工具 LM20133 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
LM20133MH 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.95V to 5.5V 16-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:BUCK REG, 3A SYNC, POWERWISE, TSSOP16 制造商:Texas Instruments 功能描述:BUCK REG, 3A SYNC, POWERWISE, TSSOP16; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:5V; Output Current:3A; Voltage Regulator Case Style:TSSOP; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes
LM20133MH/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM20133MHE 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.95V to 5.5V 16-Pin TSSOP EP T/R
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