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PDF TS2596S Data sheet ( Hoja de datos )

Número de pieza TS2596S
Descripción 2A / 150KHz Buck Dc-Dc Converter
Fabricantes Taiwan Semiconductor Company 
Logotipo Taiwan Semiconductor Company Logotipo



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TS2596S
2A / 150KHz Buck Dcww-Dw.DcataCShoeent4vU.ecormter
TO-252-5L
(PPAK)
Pin Definition:
1. Input
2. SW Output
3. Ground
4. Feedback
5. Enable
SOP-8
Pin Definition:
1. Input
2. SW Output
3. Feedback
4. Enable
5. 6. 7. 8. Ground
General 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 3.3V, 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.
Features
Output Voltage: 3.3V, 5V & Adjustable version
Adjustable Output Voltage Range 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
Absolute Maximum Rating
Parameter
Supply Voltage
Operating Voltage Range
SW, EN Pin Input Voltage
Feedback Pin Voltage
Power Dissipation
Output Voltage to Ground
Storage Temperature Range
Operating Temperature Range
Ordering Information
Part No.
Package
Packing
TS2596SCP5xx RO TO-252-5L 2.5Kpcs / 13” Reel
TS2596SCSxx RL
SOP-8 2.5Kpcs / 13” Reel
Note: Where xx denotes voltage option, available are
50= 5.0V
33= 3.3V
Leave blank for adjustable version
Application
Simple High-efficiency Step down Regulator
On-Card Switching Regulators
Symbol
VCC
VOP
VSW, VEN
VFB
PD
VOUT
TST
TOP
Limit
+28
+4.5 to +24
-0.3 to VCC
-0.3 to VCC
Internally Limited
-1
-65 to +150
-40 to +125
Unit
V
V
V
V
W
V
oC
oC
1/10 Version: A07

1 page




TS2596S pdf
TS2596S
2A / 150KHz Buck Dcww-Dw.DcataCShoeent4vU.ecormter
Function Description
Pin Function
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 – Vsat) and approximately – 0.5V, with a duty cycle of
approximately Vout / Vcc. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin
should be minimized.
Feedback
Sense the regulated output voltage to complete the feedback loop.
Enable
Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply
current to approximately 100uA. 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.
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. Higher ambient temperatures 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 double-sided,
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.
5/10 Version: A07

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