PVIN

AVIN

EN

SS

SGND

PGND

SNS

SW

LM2852Y

+

VOUT = 1.5V

1 PF

PVIN = 3.3V

AVIN = 5V

LM2852

SNVS325D – JANUARY 2005 – REVISED APRIL 2013

www.ti.com

OUTPUT FILTER CAPACITORS

The capacitors that may be used in the output filter with the LM2852 are limited in value and ESR range

according to Table 1. Below are some examples of capacitors that can typically be used in an LM2852

application.

Table 3. LM2852 Output Filter Capacitors

Capacitance (µF)

Part Number

Chemistry

Vendor

10

GRM31MR61A106KE19

Ceramic

Murata

10

GRM32DR61E106K

Ceramic

Murata

68

595D686X_010C2T

Tantalum

Vishay - Sprague

68

595D686X_016D2T

Tantalum

Vishay - Sprague

100

595D107X_6R3C2T

Tantalum

Vishay - Sprague

100

595D107X_016D2T

Tantalum

Vishay - Sprague

100

NOSC107M004R0150

Niobium Oxide

AVX

100

NOSD107M006R0100

Niobium Oxide

AVX

120

595D127X_004C2T

Tantalum

Vishay - Sprague

120

595D127X_010D2T

Tantalum

Vishay - Sprague

150

595D157X_004C2T

Tantalum

Vishay - Sprague

150

595D157X_016D2T

Tantalum

Vishay - Sprague

150

NOSC157M004R0150

Niobium Oxide

AVX

150

NOSD157M006R0100

Niobium Oxide

AVX

220

595D227X_004D2T

Tantalum

Vishay - Sprague

220

NOSD227M004R0100

Niobium Oxide

AVX

220

NOSE227M006R0100

Niobium Oxide

AVX

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 3.3V, use output filter component values recommended for 3.3V. PVIN

must always be equal to or less than AVIN.

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.

LAYOUT HINTS

These are several guidelines to follow while designing the PCB layout for an LM2852 application.

possible between the capacitor and the pin. High current levels will be present in this connection.

12

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