TS51221
High Efficiency Regulator IC for
Wireless Power Receiver Applications
TRIUNE PRODUCTS
Features
•
•
•
•
•
•
•
Fixed output voltage choices: 1.5V, 1.8V, 2.5V, 3.3V, and 5V
with +/- 2% output tolerance
Adjustable version output voltage range: 0.9V to 5.5V with
+/- 1.5% reference
Wide input voltage range: 4.5V to 24V
1MHz +/- 10% fixed switching frequency
Input under voltage lockout
Full protection for over-current, over-temperature, and
V
OUT
over-voltage
Low external component count
Description
The TS51221 is a high-efficiency regulator device for low-
power wireless power receiver applications. The switching
frequency of 1MHz enables the use of small filter components
resulting in minimal board space and reduced BOM costs.
The TS51221 integrates a wide range of protection circuitry
including input supply under-voltage lockout, output voltage
soft start, current limit, and thermal shutdown.
Summary Specification
•
•
Junction operating temperature -40 °C to 125 °C
Packaged in a 16pin QFN (3x3)
Applications
•
•
•
•
Wireless Charging for portable devices
Wear-ables, medical monitors
Bluetooth headsets
Smart watches
Typical Application Circuit
DC
Supply
Application
Processor
TS51231
TS51221
Application
Processor
Load
Transmitter
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
Receiver
www.semtech.com
1 of 18
Semtech
Pinout
PGND
PGND
VSW
VSW
PIN 1
VSW
VSW
VCC
VCC
TS51221
VCC
BST
GND
EN
PG
NC
NC
Figure 1: 16 Lead 3x3 QFN, Top View
FB
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
VSW
VCC
VCC
GND
FB
NC
NC
PG
EN
BST
VCC
VSW
VSW
PGND
PGND
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 V
OUT
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
Functional Block Diagram
Figure 2: TS51221 Block Diagram
Absolute Maximum Rating
Over operating free–air temperature range unless otherwise noted
(1, 2)
Parameter
Value
VCC
BST
VSW
EN, PG,FB
Electrostatic Discharge – Human Body Model
Electrostatic Discharge – Charge Device Model
Lead Temperature (soldering, 10 seconds)
-0.3 to 26.4
-0.3 to (VCC+6)
-1 to 26.4
-0.3 to 6
+/-2k
+/-500
260
Unit
V
V
V
V
V
V
°C
Notes:
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating
conditions” is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
www.semtech.com
3 of 18
Semtech
Thermal Characteristics
Symbol
Θ
JA
Θ
JC
T
STG
T
J MAX
T
J
Parameter
Thermal Resistance Junction to Air (Note 1)
Thermal Resistance Junction to Case (Note 1)
Storage Temperature Range
Maximum Junction Temperature
Operating Junction Temperature Range
Value
34.5
2.5
-65 to 150
150
-40 to 125
Units
°C/W
°C/W
°C
°C
°C
Note 1: Assumes 16LD 3x3 QFN with hi-K JEDEC board and 13.5 inch2 of 1 oz Cu and 4 thermal vias connected to PAD
Recommended Operating Conditions
Symbol
V
CC
C
BST
L
OUT
C
OUT
C
OUT-ESR
C
BYPASS
Bootstrap Capacitor
Output Filter Inductor Typical Value (Note 1)
Output Filter Capacitor Typical Value (Note 2)
Output Filter Capacitor ESR
Input Supply Bypass Capacitor Typical Value (Note 3)
Parameter
Input Operating Voltage
Min
4.5
17.6
3.76
33
2
8
10
12
22
4.7
Typ
Max
24
26.4
5.64
100
V
Unit
nF
uH
uF
mΩ
uF
44 (2 x 22)
Note 1: For best performance, an inductor with a saturation current rating higher than the maximum V
OUT
load requirement plus the inductor
current ripple.
Note 2: For best performance, a low ESR ceramic capacitor should be used.
Note 3: For best performance, a low ESR ceramic capacitor should be used. If C
BYPASS
is not a low ESR ceramic capacitor, a 0.1uF ceramic
capacitor should be added in parallel to C
BYPASS
.
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
www.semtech.com
4 of 18
Semtech
Electrical Characteristics
Electrical Characteristics, T
J
= -40C to 125C, VCC = 12V (unless otherwise noted)
Symbol
VCC Supply Voltage
V
CC
I
CC-NORM
I
CC-NOSWITCH
I
CC-STBY
Parameter
Input Supply Voltage
Quiescent current
Normal Mode
Quiescent current Normal
Mode – Non-switching
Quiescent current
Standby Mode
Condition
Min
4.5
Typ
Max
24
Unit
V
mA
mA
V
CC
= 12V, I
LOAD
= 0A
V
CC
=12V, I
LOAD
=0A, Non-switching
V
CC
= 12V, EN = 0V
5.2
2.3
5
10
uA
VCC Under Voltage Lockout
V
CC-UV
Input Supply Under
Voltage Threshold
Input Supply Under
Voltage Threshold
Hysteresis
Oscillator Frequency
PG Release Timer
V
CC
Increasing
4.3
4.5
V
V
CC-UV_HYST
OSC
F
OSC
T
PG
650
mV
0.9
1
10
0.5
1.1
MHz
ms
uA
PG Open Drain Output
I
OH-PG
V
OL-PG
High-Level Output Leakage V
PG
= 5V
Low-Level Output Voltage
High Level Input Voltage
Low Level Input Voltage
Input Hysteresis
Input Leakage
V
EN
=5V
V
EN
=0V
480
3.5
-1.5
I
PG
= -0.3mA
2.2
0.8
0.01
V
V
V
mV
uA
uA
EN Input Voltage Thresholds
V
IH-EN
V
IL-EN
V
HYST-EN
I
IN-EN
Thermal Shutdown
TSD
TSD
HYST
Thermal Shutdown
Junction Temperature
TSD Hysteresis
Note: not tested in production
Note: not tested in production
150
170
10
°C
°C
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
www.semtech.com
5 of 18
Semtech
