JW5017F
1.2A, 26V Synchronous
Step-Down Converter
DESCRIPTION
The JW
®
5017F is a current mode monolithic buck
switching regulator. Operating with an input range
of 4.5V~26V, the JW5017F delivers 1.2A of
continuous output current with two integrated
N-Channel MOSFETs. The JW5017F operates in
fixed 1.2MHz for all load range to prevent low
frequency interference.
The JW5017F guarantees robustness with over
current protection, thermal protection, start-up
current run-away protection, and input under
voltage lockout.
The JW5017F is available in 6-pin SOT23-6
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.
TYPICAL APPLICATION
5V/1.2A Step Down Regulators
100nF
4.7 H
Vin
100k
105k
EN
10uF
JW5017F
FB
VIN
BST
SW
Vout
5V/1.2A
GND
JW5017F Rev.0.84
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
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FEATURES
4.5 V to 26 V operating input range
1.2A output current
Up to 94% efficiency
Internal Soft-Start
Fixed 1.2MHz Switching frequency
Available in SOT23-6 package
Input under voltage lockout
Start-up current run-away protection
Over current protection and Hiccup
Thermal protection
APPLICATIONS
Distributed Power Systems
Automotive Systems
High Voltage Power Conversion
Industrial Power Systems
Battery Powered Systems
20k
10 F
1
JW5017F
ORDER INFORMATION
DEVICE
1)
JoulWatt
PACKAGE
SOT23-6
TOP MARKING
JWE6X
YWLLL
2)
JW5017FSOTB#TRPBF
PIN CONFIGURATION
TOP VIEW
VIN, EN Pin ......................................................................................................................... -0.3V to 27V
SW................................................................................................ -0.3V(-4V for 5ns) to 27V(28V for 10ns)
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
ESD Susceptibility (Human Body Model) ............................................................................................. 2kV
RECOMMENDED OPERATING CONDITIONS
Input Voltage VIN ................................................................................................................4.5V to 26V
Output Voltage Vout..................................................................................................................0.8V to 21V
Operating Junction Temperature ......................................................................................-40ºC to 125ºC
SOT23-6 ............................................................................................................................ 220...130ºC/W
1)
2)
Exceeding these ratings may damage the device.
The JW5017F 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.
JW5017F Rev.0.84
：
：
：
：
Note
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
）
）
）
）
THERMAL PERFORMANCE
4
）
）
）
）
ABSOLUTE MAXIMUM RATING
1
：
：
：
：
θ
JA
θ
Jc
Notes
2
JW5017F
3)
JoulWatt
4)
The JW5017F 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.
JW5017F Rev.0.84
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
3
JW5017F
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= 25ºC, unless otherwise stated.
Item
V
IN
Under voltage Lockout
Threshold
V
IN
Under voltage Lockout
Hysteresis
5)
JoulWatt
Symbol
V
IN_MIN
Condition
V
IN
falling
Min.
4
Typ.
4.2
Max.
4.4
Units
V
V
IN_MIN_HYST
I
SD
I
Q
V
FB
V
IN
rising
V
EN
=0V
V
EN
=5V, V
FB
=1.2V
4.5V<V
VIN
<26V
776
300
0.1
1.7
800
300
150
1
2
824
mV
µA
mA
mV
m
m
1
uA
Shutdown Supply Current
Supply Current
Feedback Voltage
Top Switch Resistance
5)
5)
R
DS(ON)T
R
DS(ON)B
I
LEAK_TOP
V
IN
=26V, V
EN
=0V,
V
SW
=0V
V
IN
= V
SW
= 26V, V
EN
=0V
Minimum Duty Cycle
1.0
Bottom Switch Resistance
Top Switch Leakage Current
Bottom Switch Leakage
Current
Top Switch Current Limit
Switch Frequency
Minimum On Time
Minimum Off Time
5)
5)
I
LEAK_BOT
I
LIM_TOP
f
SW
T
ON_MIN
T
OFF_MIN
V
EN_TH
5)
1
2
1.2
80
1.4
uA
A
MHz
ns
ns
5)
V
FB
=0.6V
V
EN
falling, FB=0V
V
EN
rising, FB=0V
1.2
120
1.3
100
150
15
1.4
EN Shutdown Threshold
EN Shutdown Hysteresis
Thermal Shutdown
5)
5)
V
mV
°C
°C
V
EN_HYST
T
TSD
T
TSD_HYST
Thermal Shutdown hysteresis
Note：
：
5)
Guaranteed by design.
JW5017F Rev.0.84
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
4
JW5017F
PIN DESCRIPTION
Pin
1
2
3
4
7
JoulWatt
Name
BST
GND
FB
EN
VIN
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.
Ground.
Output feedback pin. FB senses the output voltage and is regulated by the control loop to
800mV. Connect a resistive divider at FB.
Drive EN pin high to turn on the regulator and low to turn off the regulator.
Input voltage pin. VIN supplies power to the IC. Connect a 4.5V to 26V 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.
8
SW
BLOCK DIAGRAM
VIN
Current
Ramp
+
+
Oscillator
CLK
Current
Sensor
-
3.3V
BST
+
+
0.8V
FB
Error
+ Amplifier
-
Current
Comparator
-
Logic
Control
SW
3.3V LDO
Current
Sensor
-
+
1.2V
+
GND
EN
-
JW5017F Rev.0.84
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
5
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