RT2101B
Pin Configuration
(TOP VIEW)
16 15 14 13
1
2
3
4
12
SW
VIN
VIN
11
10
9
SW
GND
GND
GND
SW
17
SS/TR
5
6
7
8
WQFN-16L 3x3
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 2, 16
VIN
Power input.
3, 4,
Power ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
GND
17 (Exposed Pad)
5
AGND
FB
Analog ground.
6
Feedback input.
7
COMP
RT/SYNC
SS/TR
SW
Compensation node for converter stability.
Frequency setting and external synchronous. Clock input.
Soft-start and tracking.
8
9
10 to 12
Switch node. Connect this pin to external L-C filter.
Bootstrap supply for high-side gate driver. Connect a capacitor between the
BOOT and SW pin.
13
14
15
BOOT
PGOOD
EN
Output of power good indicator.
Chip enable. Externally pulled high to enable and pulled low to disable this
chip. It is internally pulled up to high when the pin is floating.
Functional Block Diagram
VIN
Internal pull up
current
Over-Temperature
Protection
UVLO
Enable Comparator
EN
Shutdown
Control
Current
Sense
EN Threshold
Oscillator
BOOT
SW
RT/SYNC
Control
Logic
Driver
Slope
Compensation
PWM
Comparator
SS/TR
FB
Soft-Start
GND
V
REF
Error
Amplifier
PGOOD Threshold
PGOOD Comparator
PGOOD COMP AGND
GND
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2
DS2101B-06 March 2020
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
