Page 1
TS2596S
SOP-8
ABSOLUTE
M
AXIMUM RATINGS
P
ARAMETER
SYMBOL
LIMIT
UNIT
THERMAL PERFORMANCE
P
ARAMETER
SYMBOL
LIMIT
UNIT
2A, 24V, 150kHz Step-Down DC-DC Converter
DESCRIPTION
TS2596S Series are step-down switching regulators
with all required active functions. It is capable of driving
2A load with excellent line and load regulations. These
devices are available in fixed output voltages of 5V,
and an adjustable output version. TS2596S series
operates at a switching frequency of 150kHz thus
allowing smaller sized filter components than what
would be needed with lower frequency switching
regulators. It substantially not only reduces the area of
board size but also the size of heat sink, and in some
cases no heat sink is required. The ±4% tolerance on
output voltage within specified input voltages and
output load conditions is guaranteed. Also, the
oscillator frequency accuracy is within ±10%. External
shutdown is included. Featuring 70μA (typical) standby
current. The output switch includes cycle-by-cycle
current limiting, as well as thermal shutdown for full
protection under fault conditions.
Taiwan Semiconductor
FEATURES
● Output Voltage: 5V & Adjustable version
● Adjustable Output Voltage 1.23V~19.5V ±4%
● 150kHz ±15% fixed switching frequency
● Voltage Mode Non-synchronous PWM control
● Thermal Shutdown and Current Limit Protection
● ON/OFF Shutdown Control Input
● Soft-Start (SS) Function
● Short Circuit Protect (SCP)
● Operating Voltage Can be up to 24V
● Output Load Current 2A
● Low Power Standby Mode
APPLICATION
● Simple High-efficiency Step down Regulator
● On-Card Switching Regulators
Pin Definition:
1. Input 8. GND
2. SW Output 7. GND
3. Feedback 6. GND
4. Enable 5. GND
Notes: MSL 3 (Moisture Sensitivity Level) per J-STD-020
(T
= 25°C unless otherwise specified)
A
Supply Voltage VCC +28 V
Operating Voltage Range VOP +4.5 to +24 V
SW, EN Pin Input Voltage VSW, VEN -0.3 to VCC V
Feedback Pin Voltage VFB -0.3 to VCC V
Power Dissipation PD Internally Limited W
Output Voltage to Ground V
Storage Temperature Range TST -65 to +150
Operating Temperature Range TOP -40 to +125
(Note 3)
-1 V
OUT
(Note 1)
o
C
o
C
Thermal Resistance Junction to Case R
Thermal Resistance Junction to Ambient R
1 Version: C1602
15 °C/W
θJC
70 °C/W
θJA
Page 2
TS2596S
ELECTRICAL SPECIFICATIONS
P
ARAMETER
S
YMBOL
CONDITION
MIN TYP MAX UNIT
Oscillator Frequency of Short
OUTP
UT VOLTAGE
PART NO.
PACKAGE
PACKING
Taiwan Semiconductor
(T
= 25°C unless otherwise specified)
A
Output Feedback
ADJ
VFB
Efficiency η V
Output Feedback
5V
VFB
Efficiency η V
4.5V≤ V
0.2A≤ I
IN
7V≤ V
0.2A≤ I
IN
Feedback Bias Current IFB VFB =1.3V (Adj version only) -- -10 -100 nA
Oscillator Frequency F
127 150 173 kHz
OSC
Soft-Start Time TSS Rising edge of EN on to ICL -- 3 -- ms
Current Limit ICL
F
Circuit Protect
Saturation Voltage V
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic Input
Current
Maximum Duty Cycle (ON)
Maximum Duty Cycle (OFF)
SCP
SAT
VIL Low (regulator ON) --
VIH High (regulator OFF) 2.0 --
IL V
IH V
DC
Pear Current, no outside circuit
VFB =0V force driver on
When current limit occurred and
VFB <0.5V, TA = 25oC
I
OUT
VFB =0V force driver on
LOGIC
LOGIC
VFB =0V force driver on -- 100 --
VFB =12V force driver off -- 0 --
Quiescent Current IQ VFB =12V force driver off -- 4 8 mA
Standby Quiescent Current I
SW Pin Leakage
Current
Note:
1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
remain possibility to affect device reliability.
2. Devices are ESD sensitive. Handing precaution recommended.
3. Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at
TA=25°C.
SW = 0
SW = -1 VIN =24V -- -5 -- mA
STBY
I
SWL
ON/OFF pin=5V --
VIN =24V -- 100
No outside circuit,
VFB =12V force driver off
ORDERING INFORMATION
Adjustable TS2596SCS RLG SOP-8 2,500pcs / 13”Reel
5V TS2596SCS50 RLG SOP-8 2,500pcs / 13”Reel
IN
LOAD
=12V, I
≤24V
IN
LOAD
=12V, I
≤24V
≤2A
=2A 76 -- -- %
LOAD
≤2A
=2A 84 -- -- %
LOAD
1.193
1.180
4..80
4.75
1.23
5
2.4 -- -- A
-- 60 -- kHz
=2A, No outside circuit
-- 1.15 1.50 V
1.3
=2.5V (OFF) -- -0.1 -0.5
=0.5V (ON) -- -- -0.01
45
-- -- -200 µA
1.267
1.280
5.20
5.25
0.6
100
V
V
V
µA
%
µA
2 Version: C1602
Page 3
FUNCTION BLOCK
TYPICAL APPLICATION CIRCUIT
Adjustable Output Voltage Version
TS2596S
Taiwan Semiconductor
Adjustable Output Voltage Version with Delayed Startup
Inverting -5V Regulator with Delayed Startup
Resistor select for output voltage setting
V
R1 R2
OUT
5V
3.3V
2.5V 1.8K 1.8K
1.8V 0.82K 1.8K
4.7K 1.5K
5.6K 1.8K
2.5K 1.5K
3.0K 1.8K
3 Version: C1602
Page 4
TS2596S
Taiwan Semiconductor
APPLICATION INFORMATION
Pin Function Descriptions
VCC
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented
at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground
SW Output
Internal switch. The voltage at this pin switches between (+VCC – V
of approximately V
pin should be minimized.
Feedback
Sense the regulated output voltage to complete the feedback loop.
Enable
Allow the switching regulator circuit to be shutdown using logic level signals, thus dropping the total input supply
current to approximately is 100µA. Pulling this pin below a threshold voltage of approximately 1.3V turns the
regulator on, and pulling this pin above 1.3V (up to a maximum of VCC) shuts the regulator down. If this shutdown
feature is not needed, the EN pin can be wired to the ground pin.
/ VCC. To minimize coupling to sensitive circuitry, the PC board copper area connected to this
OUT
) and approximately – 0.5V, with a duty cycle
SAT
Thermal Considerations
The SOP-8 package needs a heat sink under most conditions. The size of the heat sink depends on the input
voltage, the output voltage, the load current and the ambient temperature. The TS2596S junction temperature rises
above ambient temperature for a 2A load and different input and output voltages.
The data for these curves was taken with the TS2596S (SOP-8) package operating as a buck-switching regulator
in an ambient temperature of 25ºC (still air). These temperature increments are all approximate and are affected by
many factors. A higher ambient temperature requires more heat sinker.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper (need
connect to the Ground pin) should be used in the board layout, (one exception is the SW pin, which should not
have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to
the surrounding air, and moving air lowers the thermal resistance even further.
Package thermal resistance and junction temperature increments are all approximate. The increments are affected
by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board
temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or doublesided, multi-layer board and the amount of solder on the board.
The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other
components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these
components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage
changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could
either act as a heat sink taking heat away from the board, or it could add heat to the board.
4 Version: C1602
Page 5
CHARACTERISTICS CURVES
(TC = 25°C unless otherwise noted)
TS2596S
Taiwan Semiconductor
Figure 1 – V
Figure 3 – Frequency vs. V
OUT
vs. V
IN
Figure 2 – Quiescent Current vs. V
IN
IN
Figure 4 – Frequency vs. Temperature
Figure 5 – Feedback Voltage vs. Temperature
Figure 6 – Quiescent Current vs. Temperature
5 Version: C1602
Page 6
CHARACTERISTICS CURVES
(TC = 25°C unless otherwise noted)
TS2596S
Taiwan Semiconductor
Figure 7 – Threshold Voltage vs. Temperature
Figure 9 – Output Voltage vs. Temperature
Figure 8 – ON/OFF Current vs. Voltage
Figure 10 – Feedback Current vs. Temperature
Figure 11 – Efficiency (VIN=12V, V
6 Version: C1602
OUT
=3.3V)
Figure 12 – Efficiency (VIN=12V, V
OUT
=5V)
Page 7
TS2596S
50
=
Blank
=
=
O
=Jan
=Feb
=Mar
=Apr
S
=May
=Jun
=Jul
=Aug
W
=Sep
=Oct
=Nov
=Dec
= Lot
PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters)
SOP-8
Taiwan Semiconductor
SUGGESTED PAD LAYOUT (Unit: Millimeters)
MARKING DIAGRAM
XX = Output Voltage
Y
M
L
Year Code
Month Code for Halogen Free Product
Code
5.0V
= Adjustable
P
T
X
Q
U
Y
R
V
Z
7 Version: C1602
Page 8
TS2596S
Taiwan Semiconductor
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to
any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of
sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,
relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify TSC for any damages resulting from such improper use or sale.
8 Version: C1602
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