R1234D datasheet(4/26 Pages) RICOH

Part #	R1234D

Description	PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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R1234D

4

PIN CONFIGURATIO

• SON-8

8 7 6 5

1 2 3 4

5 678

4 321

∗ ∗

∗

Bottom View

Top View

PIN DESCRIPTION

Pin No

Symbol

Pin Description

1

VIN

Voltage Supply Pin

2

PGND

Power Ground Pin

3

VDD

Voltage Supply Pin

4

CE

Chip Enable Pin (active with "H")

5

VOUT/VFB

Output/Feedback Pin

6

MODE

Mode changer Pin ("L"

=PWM, "H"=VFM)

7

AGND

Analogue Ground Pin

8

LX

LX Pin (CMOS)

* Tab in the

parts have GND level. (They are connected to the reverse side of this IC.)

Do not connect to other wires or land patterns.

ABSOLUTE MAXIMUM RATINGS

Symbol

Item

Rating

Unit

VIN

VIN Supply Voltage

6.5

V

VDD

VDD Pin Voltage

6.5

V

VLX

LX Pin Voltage

−0.3 to VIN +0.3

V

VCE

CE Pin Input Voltage

−0.3 to VIN +0.3

V

VMODE

MODE Pin Input Voltage

−0.3 to VIN +0.3

V

VFB

VFB Pin Input Voltage

−0.3 to VIN +0.3

V

ILX

LX Pin Output Current

−0.8

A

PD

Power Dissipation (SON-8)

480

mW

Topt

Operating Temperature Range

−40 to +85

°C

Tstg

Storage Temperature Range

−55 to +125

°C

* ) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.

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R1234D Datasheet(PDF) 4 Page - RICOH electronics devices division

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