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TS2596S
2A / 150KHz Buck Dc-Dc Converter
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 70A (typical) standby current. The output switch includes cycle-bycycle 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
Ordering Information
Part No. Package Packing
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
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
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
o o
C C
1/9
Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
Thermal Information
Parameter
Thermal Resistance* (Junction to Case) Thermal Resistance* (Junction to Ambient)
Symbol
JC JA
Maximum 15 70
2
Unit
o o
C/W C/W
Note: JA is measured with the PCB copper area (need connect to GROUND pins) of approximately 1.5 in (Multi-layer)
Electrical Specifications (All Output Voltage Version)
(Ta = 25 C unless otherwise noted, VIN=12V for 3.3V, 5V, Adj version. ILOAD =0.2A)
o
Parameter
Output Feedback Efficiency Output Feedback Efficiency Output Feedback Efficiency Feedback Bias Current Oscillator Frequency Soft-Start Time Current Limit Oscillator Frequency of Short Circuit Protect Saturation Voltage ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current Maximum Duty Cycle (ON) Maximum Duty Cycle (OFF) Quiescent Current Standby Quiescent Current SW Pin Leakage Current SW pin = 0 SW pin = -1 5V 3.3V ADJ
Symbol
VFB VFB VFB IFB FOSC TSS ICL FSCP VSAT VIL VIH IL IH DC IQ ISTBY
Test Condition
4.5V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A 4.75V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A 7V VIN 24V 0.2A ILOAD 2A VIN =12V, ILOAD =2A VFB =1.3V (Adj version only) Rising edge of EN on to ICL Pear Current, no outside circuit VFB =0V force driver on When current limit occurred and VFB <0.5V, Ta = 25 C IOUT=2A, No outside circuit VFB =0V force driver on Low (regulator ON) High (regulator OFF) VLOGIC =2.5V (OFF) VLOGIC =0.5V (ON) VFB =0V force driver on VFB =12V force driver off VFB =12V force driver off ON/OFF pin=5V VIN =24V No outside circuit, VFB =12V force driver off VIN =24V
o
Min
1.193 1.180 76 3.168 3.135 80 4..80 4.75 84 -127 -2.4 ---2.0 ----------
Typ
1.23 -3.3V -5 --10 150 3 -60 1.15 1.3 -0.1 -100 0 4 45 --5
Max
1.267 1.280 -3.432 3.465 -5.20 5.25 --100 173 ---1.50 0.6 --0.5 -0.01 --8 100 100 -200 --
Unit
V % V % V % nA KHz mS A KHz V V A % mA A A mA
ISWL
2/9
Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
Block Diagram
Typical Application Circuit
1. Adjustable Output Voltage Version
Resistor select for output voltage setting Vout R1 R2 4.7K 1.5K 5V 5.6K 1.8K 2.5K 1.5K 3.3V 3.0K 1.8K 2.5V 1.8K 1.8K 1.8V 0.82K 1.8K 3/9 Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
Typical Application Circuit (Continue)
2. Fixed Output Voltage Version
3. Adjustable Output Voltage Version with Delayed Startup
4. Inverting -5V Regulator with Delayed Startup
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Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
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 25C (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.
5/9
Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
Electrical Characteristics Curve
Figure 1 - Vout vs. Vin
Figure 2 - Quiescent Current vs. Vin
Figure 3 - Frequency vs. Vin
Figure 4 - Frequency vs. Temperature
Figure 5 - Feedback Voltage vs. Temperature
Figure 6 - Quiescent Current vs. Temperature
6/9
Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
Electrical Characteristics Curve
Figure 7 - Threshold Voltage vs. Temperature
Figure 8 - ON/OFF Current vs. voltage
Figure 9 - Output Voltage vs. Temperature
Figure 10 - Feedback Current vs. Temperature
Figure 11 - Efficiency (Vin=12V, Vo=3.3V)
Figure 12 - Efficiency (Vin=12V, Vo=5V)
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Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
SOP-8 Mechanical Drawing
DIM A B C D F G K M P R
SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0 7 0 7 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019
Marking Diagram
= Year Code = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) L = Lot Code XX = Output Voltage (33=3.3V, 50=5V) Blank for Adjustable type Y M
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Version: B07
TS2596S
2A / 150KHz Buck Dc-Dc Converter
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.
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Version: B07

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