S5ELM2576 SECOS | Alldatasheet
Document overview
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- PDF pages: 8
Technical content
Features
- High Efficiency * 52KHz Fixed Frequency Oscillator * 3.3V,5V,12V,15V and Adjustable Output Versions * Uses Readily Available Standard Inductors * TTL Shutdown Capability, Low Power Standby Mode * Simple High-Effciency Step-Down (Buck) Regulator * Positive To Negative Converter (Buck-Boost) * One-Card Switching Regulators
Applications
- Guaranteed 3A Output Current * Thermal Shutdown And Current Limit Protection * Efficient Per-regulator For Linear Regulators * Requires Only 4 Extermal Components * Adjustable Version Output Voltage Range, 1.23V to 37V 4% Max. Over Line And Load Conditions A 4.40 4.80 c1 1.25 1.45 b 0.76 1.00 b1 1.17 1.47 c 0.36 0.50 L 13.25 14.25 D 8.60 9.00 e 2.54 REF. E 9.80 10.4 L1 2.60 2.89 L4 14.7 15.3 Ø 3.71 3.96 Millimeter Millimeter
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 8 tage does not sag below the minimum dropout voltage during the load V higher than Vout in order for the device to
Description
Typically a large storage capacitor is connected from this pin to ground to insure that the input 1.3V or open= output enable. NC Typical Application (Fixed Output Voltage Version) Block Diagram S5ELM2576-5.0 3.3V , R2=17k 5.0V , R2=3.1k 12V , R2=8.84k 15V , R2=11.3k For Adjustable version, R1=open, R2=0 Absolute Maximum Ratings (Note1) Parameter Ratings Unit Maximum Supply Voltage 45 V ON/OFF pin input Voltage -0.3 V +VIN V Output Voltage to ground (steady state) -1 V Power dissipation Internally Limited Storage Temperature -65 ~ +150 : Maximum junction temperature +150 : Minimum ESD rating (C=100pF, R=1.5k) 2k V Lead temperature (soldering, 10seconds) +260 : Operating Ratings Parameter Ratings Unit Temperature range -40 TJ +125 : Supply Voltage 40 V S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
01-Jun-2002 Rev. A Page 3 of 8 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente S5ELM2576-3.3 Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A Circuit of Figure 2 3.234 3.3 3.366 V Output Voltage VOUT 6V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A 75 % S5ELM2576-5.0 Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A Circuit of Figure 2 4.9 5.0 5.1 V Output Voltage VOUT 8V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A 77 % Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=25V, ILOAD=0.5A Circuit of Figure 2 11.76 12 12.24 V Output Voltage VOUT 15V VIN 40V, 0.5A ILOAD 3A Circuit of Figure 2 11.52/11.40 12 12.48/12.60 V Efficiency VIN=15V, ILOAD=3A 88 % Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=25V, ILOAD=0.5A Circuit of Figure 2 14.70 15 15.30 V Output Voltage VOUT 18V VIN 40V, 0.5A ILOAD 3A Circuit of Figure 2 14.40/14.25 15 15.60/15.75 V Efficiency VIN=18V, ILOAD=3A 88 % Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range Parameter Symbol Conditions Min Typ Max Unit System Parameters (Note3) Test Circuit Figure 2 Output Voltage VOUT VIN=12V, ILOAD=0.5A, VOUT=5V Circuit of Figure 2 1.217 1.230 1.243 V Output Voltage VOUT 8V VIN 40V, 0.5A ILOAD 3A Efficiency VIN=12V, ILOAD=3A, VOUT=5V 77 % S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
01-Jun-2002 Rev. A Page 4 of 8 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual All Output Voltage Version Electrical Characteristics Specifications with standard type face are for TJ=25 :, and those with boldface type apply over full operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V, 5.0V and Adjustable versions, VIN=25V for 12V version, and VIN=30V for 15V version. ILOAD=0.5A Parameter Symbol Conditions Min Typ Max Unit Feedback bias current Ib VOUT=5V (adjustable version only) - 50 100/500 nA Oscillator frequency f O (Note 8) 47/42 52 58/63 kHz Saturation voltage VSAT ILOAD=3A (Note 4) - 1.4 1.8/2.0 V Maximum duty cycle (ON) DC (Note 5) 93 98 % Output leakage current IL (Note 6, 7) Output=0V Output=-1V 7.5 30 mA Quiescent current IQ (Note 6) - 5 10 mA Standby quiescent current ISTBY ON/OFF pin=5V (OFF) - 50 200 uA ON/OFF Control VIH VOUT =0V 2.2/2.4 1.4 - ON/OFF pin logic input level VIL VOUT =Nominal output voltage - 1.2 1.0/0.8 V IIH ON/OFF pin=5V (OFF) - 12 30 ON/OFF pin input current IIL ON/OFF pin=0V (ON) - 0 10 uA Note 1: Absolute Maximum Rating indicate limits beyond which damage to the device may occur. Operating Rating indicate conditions for which the device is intended to be functional, but do not guaranteed specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). Note 3: External component such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the G5ELM2576 is used as shutdown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output. Note 5: Feedback pin removed from output and connected to 0V. Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V and 5V versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. Note 7: VIN=40V. Note 8: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
01-Jun-2002 Rev. A Page 5 of 8 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Typical Performance Characteristics (circuit of Figure 1) Normalized Output Voltage Line Regulator Dropout Voltage Standby Quiescent Current Quiescent Current Current Limit S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 6 of 8 tage does not sag below the minimum dropout voltage during the load V higher than Vout in order for the device to Typically a large storage capacitor is connected from this pin to ground to insure that the input 1.3V or open= output enable. NC Switch Saturation Voltage Efficiency Oscillator Frequency Minimum Operating voltage Quiescent Current vs Duty Cycle Feedback Voltage vs Duty Cycle S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
01-Jun-2002 Rev. A Page 7 of 8 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente Minimum Power Dissipation Feedback Pin Current Switching Waveforms Load Transient Response Output Voltage Change Load Current VOUT=15V A: Output Pin Voltage, 50V/div B: Output Pin Current, 2A/div C: Inductor Current, 2A/div D: Output Ripple Voltage, 50mV/div AC Coupled Horizontal Time Base: 5us/div S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 8 of 8 Elektronische Bauelemente Test Circuit and layout Guidelines As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short. S5ELM2576 Cin-- 100uF, 75V, Aluminum Electrolytic Cout-- 1000uF, 25V Aluminum Electrolytic D1-- Schottky, MBR360 L1-- 100uH, Pulse Eng, PE92108 R1-- 2k, 0.1% R1-- 6.12k, 0.1% Vout=VREF*(1+R2/R1) R2=R1*(Vout/VREF-1) Where VREF=1.23V, R1 between 1k and 5k Figure 1 S5ELM2576 S5ELM2576 Simple Switcher 3A Step-Down Voltage Regulator