XL2594-12

XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 FEATURES DESCRIPTION • 5V, 12V, ADJ, and Adjustable Output Versions • Adjustable Version Output Voltage Range, 1.2V to 37V (57V for the HV Version)±4% Max Over Line and Load Conditions • Available in 8-pin Surface Mount SOIC and PDIP-8 Package • Ensured 0.5A Output Current • Input Voltage Range up to 60V • Requires only 4 External Components • 150 kHz Fixed Frequency Internal Oscillator • TTL Shutdown Capability • Low Power Standby Mode, IQ typically 85 μA • High Efficiency • Uses Readily Available Standard Inductors • Thermal Shutdown and Current Limit Protection The XL2594 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 5V, 12V, ADJ and an adjustable output version, and are packaged in a 8-lead PDIP and a 8-lead surface mount SOIC package. 1 2345 Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation†, a fixedfrequency oscillator, and improved line and load regulation specifications. The XL2594 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed. APPLICATIONS • • • • A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the XL2594 series. This feature greatly simplifies the design of switch-mode power supplies. Simple High-efficiency Step-down (Buck) Regulator Efficient Pre-regulator for Linear Regulators On-card Switching Regulators Positive to Negative Convertor Other features include an ensured ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85 μA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. The XL2594 is for applications requiring an input voltage up to 60V. 1 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 Absolute Maximum Ratings (1) (2) Maximum Supply Voltage XL2594 45V ON /OFF Pin Input Voltage −0.3 ≤ V ≤ +25V Feedback Pin Voltage −0.3 ≤ V ≤+25V −1V Output Voltage to Ground (Steady State) Power Dissipation Internally limited −65°C to +150°C Storage Temperature Range ESD Susceptibility (3) 2 kV Vapor Phase (60 sec.) +215°C Infrared (15 sec.) +220°C Human Body Model Lead Temperature D8 Package P Package (Soldering, 10 sec.) +260°C Maximum Junction Temperature +150°C (1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. Operating Conditions −40°C ≤ TJ +125°C Temperature Range Supply Voltage XL2594 4.5V to 40V XL2594 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range.VINmax= 40V for the LM2594 and 60V for the LM2594HV. Symbol Parameter Conditions XL2594 Typ (1) Limit (2) Units (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 16 VOUT Output Voltage 4.75V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A 3.3 3.432/3.465 3.168/3.135 η (1) (2) (3) Efficiency VIN = 12V, ILOAD = 0.5A 80 V V(min) V(max) % Typical numbers are at 25°C and represent the most likely norm. All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XL2594 is used as shown in the Figure 16 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. 2 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 XL2594 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range Symbol Parameter XL2594 Conditions Typ (1) Limit (2) Units (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 16 VOUT Output Voltage 7V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A 5.0 4.800/4.750 5.200/5.250 η Efficiency (1) (2) (3) VIN = 12V, ILOAD = 0.5A 82 V V(min) V(max) % Typical numbers are at 25°C and represent the most likely norm. All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XL2594 is used as shown in the Figure 16 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. XL2594 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range Symbol Parameter Conditions XL2594 Typ (1) Limit (2) Units (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 16 VOUT Output Voltage 15V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A η Efficiency VIN = 25V, ILOAD = 0.5A 12.0 11.52/11.40 12.48/12.60 (1) (2) (3) 88 V V(min) V(max) % Typical numbers are at 25°C and represent the most likely norm. All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XL2594 is used as shown in the Figure 16 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. XL2594 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range Symbol Parameter XL2594 Conditions Typ (1) Limit (2) Units (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 16 VFB Feedback Voltage 4.5V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A VOUT programmed for 3V. Circuit of Figure 16 η Efficiency VIN = 12V, ILOAD = 0.5A (1) (2) (3) 1.230 1.193/1.180 1.267/1.280 80 V V(min) V(max) % Typical numbers are at 25°C and represent the most likely norm. All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XL2594 is used as shown in the Figure 16 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. 3 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range . Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V version. ILOAD = 100 mA Symbol Parameter Conditions XL2594 Typ (1) Limit (2) 50/100 Units (Limits) DEVICE PARAMETERS Ib Feedback Bias Current Adjustable Version Only, VFB = 1.3V 10 fO Oscillator Frequency See (3) 150 VSAT DC ICL Saturation Voltage IOUT = 0.5A (4) (5) Max Duty Cycle (ON) See (5) Min Duty Cycle (OFF) See (6) Current Limit Peak Current (4) (5) 127/110 kHz(min) 173/173 kHz(max) 1.1/1.2 V(max) 0.9 V 100 % 0 0.8 A 0.65/0.58 IL Output Leakage Current IQ Quiescent Current ISTBY Standby Quiescent Current Output = 0V (4) (6) (7) Output = −1V See (6) μA(max) mA 15 mA(max) 10 mA(max) mA μA 85 200/250 140 Thermal Resistance A(max) 50 5 ON/OFF pin = 5V (OFF) (7) P Package, Junction to Ambient (8) MDPackage, Junction to Ambient (8) A(min) 1.3/1.4 2 XL2594 θJA nA kHz 250/300 95 μA(max) μA(max) °C/W 150 ON/OFF CONTROL Test Circuit Figure 16 ON /OFF Pin Logic Input VIH Threshold Voltage VIL IH IL (1) (2) (3) (4) (5) (6) (7) ON /OFF Pin Input Current 1.3 V Low (Regulator ON) 0.6 V(max) High (Regulator OFF) 2.0 V(min) 15 μA(max) 5 μA(max) VLOGIC = 2.5V (Regulator OFF) VLOGIC = 0.5V (Regulator ON) μA 5 μA 0.02 Typical numbers are at 25°C and represent the most likely norm. All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current overload. No diode, inductor or capacitor connected to output pin. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and connected to 12V for the 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF. VIN = 40V for the XL2594. 4 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 Typical Performance Characteristics Normalized Output Voltage Line Regulation Figure 3. Figure 4. Efficiency Switch Saturation Voltage Figure 5. Figure 6. Switch Current Limit Dropout Voltage Figure 7. Figure 8. 5 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 Typical Performance Characteristics (continued) Quiescent Current Standby Quiescent Current Figure 9. Figure 10. Minimum Operating Supply Voltage ON /OFF Threshold Voltage Figure 11. Figure 12. ON /OFF Pin Current (Sinking) Switching Frequency Figure 13. Figure 14. 6 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 Typical Performance Characteristics (continued) Feedback Pin Bias Current Figure 15. 7 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 TYPICAL CIRCUIT AND LAYOUT GUIDELINES Fixed Output Voltage Versions XL2594 CIN — 68 μF, 35V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 1A, 40V Schottky Rectifier, 1N5819 L1 — 100 μH, L20 Select components with higher voltage ratings for designs using the XL2594 with an input voltage between 40V and 60V. Adjustable Output Voltage Versions XL2594 CIN — 68 μF, 35V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 1A, 40V Schottky Rectifier, 1N5819 L1 — 100 μH, L20 R1 — 1 kΩ, 1% CFF — See Application Information Section Figure 16. Typical Circuits and Layout Guides As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring can cause problems. 8 XL2594-5.0 SOP8 XL2594-12 SOP8 XL2594-ADJ SOP8 89