JW5022S
2A, 24V Synchronous
Step-Down Converter
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DESCRIPTION
The JW
®
5022S is a current mode monolithic buck
voltage converter. Operating with an input range
of 4.5-24V, the JW5022S delivers 2A of
continuous output current with two integrated
N-Channel MOSFETs. At light loads, regulators
operate in low frequency to maintain high
efficiency and low output ripple.
The JW5022S guarantees robustness with over
current protection, thermal protection, start-up
current run-away protection, and input under
voltage lockout.
The JW5022S is available in a 8-pin SOP8
package, which provides a compact solution with
minimal external components.
Company’s Logo is Protected, “JW” and “JOULWATT” are Registered
Trademarks of JoulWatt technology Inc.
FEATURES
4.5V to 24V operating input range
2A output current
Up to 94% efficiency
High efficiency (85>%) at light load
Fixed 500kHz Switching frequency
Input under voltage lockout
Available in SOP8 package
Start-up current run-away protection
Over current protection and Hiccup
Thermal protection
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
TYPICAL APPLICATION
JW5022S Rev.0.31
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
1
JW5022S
ORDER INFORMATION
TOP
LEAD FREE FINISH
JW5022SSOPB#PBF
TAPE AND REEL
JW5022SSOPB#TRPBF
PACKAGE
MARKING
SOP8
JW5022S
JoulWatt
Note
PIN CONFIGURATION
TOP VIEW
VIN, EN, SW Pin ................................................................................................................. -0.3V to 24V
BST Pin ................................................................................................................... SW-0.3V to SW+5V
All other Pins ......................................................................................................................... -0.3V to 6V
Junction Temperature
2) 3)
..................................................................................................................150ºC
Lead Temperature
......................................................................................................................260ºC
Storage Temperature .................................................................................................. -65ºC to +150ºC
RECOMMENDED OPERATING CONDITIONS
Input Voltage VIN ................................................................................................................4.5V to 24V
Output Voltage Vout................................................................................................................. 0.6V to 22V
Operating Junction Temperature(T
J
)....................................................................................-40ºC to 125ºC
SOP8 ..................................................................................................................................... 96...45ºC/W
Note
1)
2)
3)
Exceeding these ratings may damage the device.
The JW5022S guarantees robust performance from -40°C to 150°C junction temperature. The junction temperature
range specification is assured by design, characterization and correlation with statistical process controls.
The JW5022S includes thermal protection that is intended to protect the device in overload conditions. Thermal
protection is active when junction temperature exceeds the maximum operating junction temperature. Continuous
operation over the specified absolute maximum operating junction temperature may damage the device.
Measured on JESD51-7, 4-layer PCB.
4)
JW5022S Rev.0.31
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
2
cJ
cJ
cJ
cJ
AJ
AJ
AJ
AJ
）4
4
THERMAL PERFORMANCE
）1
）1
）1
）1
ABSOLUTE MAXIMUM RATING
：
θ
θ
：
：
：
：
JW5022S
ELECTRICAL CHARACTERISTICS
JoulWatt
Item
V
IN
Undervoltage Lockout Threshold
V
IN
Undervoltage Lockout Hysteresis
Shutdown Supply Current
Supply Current
Feedback Voltage
Top Switch Resistance
Bottom Switch Resistance
Top Switch Leakage Current
Bottom Switch Leakage Current
Top Switch Current Limit
Switch Frequency
Minimum On Time
Minimum Off Time
EN shut down threshold voltage
EN shut down hysteresis
Thermal Shutdown
Temperature Hysteresis
T
HYS
19
JW5022S Rev.0.31
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
3
℃
℃
,℃
VIN=12V, T
A
=25
unless otherwise stated.
Symbol
V
IN_MIN
V
IN_MIN_HYST
I
SD
I
Q
V
FB
R
DS(ON)T
R
DS(ON)B
I
LEAK_TOP
V
IN
=24V, V
EN
=0V,
V
SW
=0V
V
IN
=24V, V
EN
=0V,
V
SW
=0V
Minimum Duty Cycle
3.8
500
100
V
FB
=0.7V
V
EN
falling, FB=0V
V
EN
rising, FB=0V
100
1.2
100
145
Condition
V
IN
falling
V
IN
rising
V
EN
=0V
V
EN
=5V, V
FB
=2V
Min.
Typ.
3.8
300
Max.
Units
V
mV
1
50
0.895
0.923
170
110
0.5
0.951
µA
µA
V
m
m
uA
I
LEAK_BOT
I
LIM_TOP
F
SW
T
ON_MIN
T
OFF_MIN
V
EN_TH
V
EN_HYST
T
TSD
0.5
uA
A
kHz
ns
ns
V
mV
JW5022S
PIN DESCRIPTION
PIN
1
JoulWatt
NAME
BST
Description
Bootstrap pin for top switch. A 0.1uF or larger capacitor should be connected between this
pin and the SW pin to supply current to the top switch and top switch driver.
Input voltage pin. VIN supplies power to the IC. Connect a 4.6V to 24V supply to VIN and
bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
SW is the switching node that supplies power to the output. Connect the output LC filter
from SW to the output load.
Power ground pin.
Output feedback pin. FB senses the output voltage and is regulated by the control loop to
0.923V. Connect a resistive divider at FB.
Not Connected.
Drive EN pin high to turn on the regulator and low to turn off the regulator.
Not Connected.
2
IN
3
4
5
6
7
8
SW
GND
FB
NC
EN
NC
BLOCK DIAGRAM
VIN
Current
Ramp
+
+
Oscillator
CLK
3.3V
Current
Sensor
-
BST
+
SS
0.6V
FB
+
Error
+ Amplifier
-
Current
Comparator
-
Logic
Control
SW
3.3V LDO
Current
Sensor
-
+
1.3V
+
GND
EN
-
JW5022S Rev.0.31
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
4
JW5022S
TYPICAL PERFORMANCE CHARACTERISTICS
Vin =12V, Vout = 3.3V, L = 4.7µH, Cout = 22µF, TA = +25°C, unless otherwise noted
Steady State Test
VIN=12V, Vout=3.3V
Iout=2A
JoulWatt
Startup through Enable
VIN=12V, Vout=3.3V
Iout=2A(Resistive load)
Shutdown through Enable
VIN=12V, Vout=3.3V
Iout=2A(Resistive load)
Heavy Load Operation
2A LOAD
Medium Load Operation
1A LOAD
Light Load Operation
0 A LOAD
Short Circuit Protection
VIN=12V, Vout=3.3V
Iout=2A- Short
Short Circuit Recovery
VIN=12V, Vout=3.3V
Iout= Short-2A
Load Transient
1A LOAD
2A LOAD
JW5022S Rev.0.31
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
5
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→
1A LOAD
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