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LM2852YMXAX-1.0 数据表(PDF) 11 Page - Texas Instruments

部件名 LM2852YMXAX-1.0
功能描述  Synchronous Simple Switcher Buck Regulator
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2852YMXAX-1.0 数据表(HTML) 11 Page - Texas Instruments

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CSS = 3.3 nF
CO = 100 PF
PVIN
AVIN
EN
SS
SGND
PGND
SNS
SW
LM2852Y
+
VOUT = 1.5V
ILOAD = 0A to 2A
LO = 10 PH
CIN = 47 PF
1 PF
PVIN = 3.3V
AVIN = 5V
LM2852
www.ti.com
SNVS325E – JANUARY 2005 – REVISED JANUARY 2016
7.3 Feature Description
7.3.1 Split-Rail Operation
The LM2852 can be powered using two separate voltages for AVIN and PVIN. AVIN is the supply for the control
logic; PVIN is the supply for the power FETs. The output filter components need to be chosen based on the
value of PVIN. For PVIN levels lower than 3.3 V, use output filter component values recommended for 3.3 V.
PVIN must always be equal to or less than AVIN.
Figure 11. Split-Rail Operation
7.3.2 Switch Node Protection
The LM2852 includes protection circuitry that monitors the voltage on the switch pin. Under certain conditions,
switching is disabled in order to protect the switching devices. One result of the protection circuitry may be
observed when power to the LM2852 is applied with no or light load on the output. The output regulates to the
rated voltage, but no switching may be observed. As soon as the output is loaded, the LM2852 begins normal
switching operation.
7.4 Device Functional Modes
The LM2852 Enable pin is internally pulled up so that the part is enabled anytime the input voltage exceeds the
UVLO threshold. A pulldown resistor can be used to set the enable input to low.
Copyright © 2005–2016, Texas Instruments Incorporated
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