R1234D Datasheet, PDF (4/26 Pages) RICOH electronics devices division – PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

R1234D
PIN CONFIGURATIO
Top View
8765
• SON-8
Bottom View
5678
∗∗
∗
1234
4321
PIN DESCRIPTION
Pin No
1
2
3
4
5
6
7
8
Symbol
VIN
PGND
VDD
CE
VOUT/VFB
MODE
AGND
LX
Pin Description
Voltage Supply Pin
Power Ground Pin
Voltage Supply Pin
Chip Enable Pin (active with "H")
Output/Feedback Pin
Mode changer Pin ("L"=PWM, "H"=VFM)
Analogue Ground Pin
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
VIN
VDD
VLX
VCE
VMODE
VFB
ILX
PD
Topt
Tstg
Item
VIN Supply Voltage
VDD Pin Voltage
LX Pin Voltage
CE Pin Input Voltage
MODE Pin Input Voltage
VFB Pin Input Voltage
LX Pin Output Current
Power Dissipation (SON-8)
Operating Temperature Range
Storage Temperature Range
Rating
6.5
6.5
−0.3 to VIN +0.3
−0.3 to VIN +0.3
−0.3 to VIN +0.3
−0.3 to VIN +0.3
−0.8
480
−40 to +85
−55 to +125
Unit
V
V
V
V
V
V
A
mW
°C
°C
* ) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
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