RT2657BQ
Ordering Information
RT2657BQ
Package Type
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
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Pin Configurations
(TOP VIEW)
LX
NC
FB
NC
1
2
3
4
8
7
6
5
9
GND
VIN
EN
NC
WDFN-8L 3x3
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
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Function Pin Description
Pin No.
1
2, 4, 5
3
6
7
Pin Name
LX
NC
FB
EN
VIN
Pin Function
Switch Node. Connect to the external inductor.
No Internal Connection. Connect to GND.
Feedback Voltage Input. Connect to the external resistor divider.
Enable Control Input (Activ e High).
Power Input. Connect to the input capacitor.
Power GND. The Exposed Pad must be soldered to a large PCB and connected
to GND f or maximum power dissipation.
8,
GND
9 (Exposed Pad)
Function Block Diagram
EN
VIN
GND
OSC &
Shutdown
Control
Slope
Compensation
Current
Sense
Error
Amplifier
PWM
Comparator
R
S1
Current
Limit
Detector
FB
Control
Logic
Driver
LX
R
C
COMP
R
S2
UVLO &
Power Good
Detector
GND
V
REF
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS2657BQ-00 July 2014
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
