TS51221 Datasheet, PDF (2/18 Pages) Semtech Corporation – High Efficiency Regulator IC for Wireless Power Receiver Applications

Pinout
PIN 1 VSW
VSW
VCC
VCC
TS51221
VCC
BST
GND
EN
Figure 1: 16 Lead 3x3 QFN, Top View
Pin Description
Pin #
1
2
3
4
Pin Name
VSW
VCC
VCC
GND
5
FB
6
NC
7
NC
8
PG
9
EN
10
BST
11
VCC
12
VSW
13
VSW
14
PGND
15
PGND
16
VSW
Pin Function
Switching Voltage Node
Input Voltage
Input Voltage
GND
Feedback Input
No Connect
No Connect
Power Good Output
Enable Input
Bootstrap Capacitor
Input Voltage
Switching Voltage Node
Switching Voltage Node
Power GND
Power GND
Switching Voltage Node
Description
Connected to 4.7uH (typical) inductor
Input voltage
Input voltage
Primary ground for the majority of the device except the low-side
power FET
Regulator FB Voltage.Connects to VOUT for fixed mode and the output
resistor divider for adjustable mode
Not Connected
Not Connected
Open-drain output
Above 2.2V the device is enabled.GND the pin to put device in
standby mode.Includes internal pull-up
Bootstrap capacitor for the high-side FET gate driver.22nF ceramic
capacitor from BST pin to VSW pin
Input Voltage
Connected to 4.7uH (typical) inductor
Connected to 4.7uH (typical) inductor
GND supply for internal low-side FET/integrated diode
GND supply for internal low-side FET/integrated diode
Connected to 4.7uH (typical) inductor
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
www.semtech.com
2 of 18
Semtech