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ELMOS Semiconductor AG

Data Sheet

QM-No.: 25DS0064E.01

PRELIMINARY INFORMATION - MAY 29, 2012

This document contains information on a pre-production product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.

LOW QUIESCENT CURRENT STEP DOWN CONVERTER FAMILY

Figure 5: Typical operating circuit diagram

Table 2: External Components

9 Typical Operating Circuit

AGND

E522.0x

L1

D1

R3

C3

VOUT

LXT

VIN

ON

Opt. EMC Filter

L2

D2

C2

R2

C1

C4

C5

C6

IN

R1

R6

SENSE

SENSE

VOUT

OCP

PGOOD

PGND

PGOOD

GND

external programming for E522.05/06/09

R5

R4

C7

Symbol

Min

Typ

Max

Unit

Description

R1

3.3

kΩ

Pull up resistor for PGOOD

R2

24

60

kΩ

OCP configuration resistor

R3

3.3

kΩ

Optional resistor for connection to VIN

R4

kΩ

Resistor for output voltage programming

R5

30

kΩ

Resistor for output voltage programming

R6

0.2

Ω

Optional ESR-equivalent resistor

C1

47

100

µF

Output filter capacitor, low ESR

C2

33

100

nF

Output filter capacitor, low ESR, low ESL type

C3

20

33

µF

Input filter capacitor

C4

220

nF

Input filter capacitor, low ESR, low ESL type

C5

100

nF

EMC capacitor; low ESR, low ESL type

C6

1

nF

EMC capacitor; low ESR, low ESL type

C7

Optional AC-coupling capacitor (see chapter 9.2.5)

L1

18

33

82

µH

Inductor L

L1

10

22

82

µH

Inductor L

L2

EMC ferrite e.g. Würth 742-792-118

D1

Freewheeling diode for LXT, preferred Vishay SS14

D2

Optional reverse polarity protection diode

1) Select for V

R

)