RT7272B
Pin Configurations
Marking Information
RT7272BGSP : Product Number
(TOP VIEW)
RT7272B
GSPYMDNN
YMDNN : Date Code
8
7
6
5
SW
BOOT
EN
VIN
2
3
4
RLIM
COMP
FB
GND
9
GND
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
SW
Switch Node Connect to external L-C filter.
Bootstrap Supply for High Side Gate Drive. A 100nF or greater capacitor is
recommended to connect from BOOT pin to SW pin.
2
3
BOOT
EN
Enable Control Input. A logic-high enables the converter; a logic-low forces the
device into shutdown mode.
4,
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
GND
9 (Exposed Pad)
Feedback Input. This pin is connected to the converter output. It is used to set
the output of the converter to regulate to the desired value via an resistive
divider.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
5
6
FB
COMP
7
8
RLIM
VIN
Current Limit Setting. Connect to a resistor to determine current limit.
Power Input. The input voltage range is from 4.5V to 36V. Must bypass with a
suitable large ceramic capacitor.
Function Block Diagram
VIN
V
CC
Internal
Regulator
Oscillator
Current Sense
Amplifier
Shutdown
Comparator
V
V
CC
A
Slope Comp
+
V
A
Foldback
Control
R
SENSE
-
1.2V
+
-
0.4V
+
BOOT
SW
UV
Lockout
Comparator
-
S
R
Q
Q
150m
80m
UV
5k
Comparator
-
EN
+
-
+
1.7V
Current
Comparator
GND
V
CC
+
0.8V
EA
SS
+
-
RLIM
FB
COMP
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS7272B-06 November 2016
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
