XH2596 TO-263 3.3 5.0 12 ADJ 1FEATURES DESCRIPTION The XH2596 series of regulators are monolithic 23• 3.3V,5V,12V,ADJ and Adjustable Output Versions integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of • Adjustable Version Output Voltage Range, driving a 3A load with excellent line and load 1.2V to 37V ±4% Max Over Line and Load regulation. These devices are available in fixed output Conditions voltages of 3.3V, 5V, 12V, and an adjustable output • Ensured 3A Output Load Current version. • Input Voltage Range Up to 40V Requiring a minimum number of external • Requires Only 4 External Components components, these regulators are simple to use and • Excellent Line and Load Regulation include internal frequency compensation , and a Specifications fixed-frequency oscillator. • 150 kHz Fixed Frequency Internal Oscillator The XH2596 series operates at a switching frequency • TTL Shutdown Capability of 150 kHz thus allowing smaller sized filter components than what would be needed with lower • Low Power Standby Mode, IQ Typically 80 μA frequency switching regulators. Available in a • High Efficiency different lead bend options, and a 5-lead TO-263 • Uses Readily Available Standard Inductors surface mount package. • Thermal Shutdown and Current Limit A standard series of inductors are available from Protection several different manufacturers optimized for use with the XH2596 series. This feature greatly simplifies the design of switch-mode power supplies. APPLICATIONS Other features include a ensured ±4% tolerance on • Simple High-Efficiency Step-Down (Buck) output voltage under specified input voltage and Regulator output load conditions, and ±15% on the oscillator • On-Card Switching Regulators frequency. External shutdown is included, featuring • Positive to Negative Converter typically 80 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. (1) Typical Application (Fixed Output Voltage Versions) XH2596 5.0 1 XH2596 TO-263 3.3 5.0 12 ADJ Connection Diagrams Figure 2. 5-Lead TO-263 (S) Package See Package Number KTT0005B Absolute Maximum Ratings (1)(2) Maximum Supply Voltage 45V ON /OFF Pin Input Voltage −0.3 ≤ V ≤ +25V Feedback Pin Voltage −0.3 ≤ V ≤+25V Output Voltage to Ground (Steady State) −1V Power Dissipation Internally limited Storage Temperature Range −65°C to +150°C ESD Susceptibility Human Body Model (3) 2 kV Lead Temperature DDPAK/TO-263 Package Vapor Phase (60 sec.) +215°C Infrared (10 sec.) +245°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. (2) The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin. Operating Conditions Temperature Range −40°C ≤ TJ ≤ +125°C Supply Voltage 4.5V to 40V 2 XH2596 TO-263 3.3 5.0 12 ADJ XH2596-3.3 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range XH2596-3.3 Units Symbol Parameter Conditions Typ Limit (1) (2) (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 20 VOUT Output Voltage 4.75V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A 3.3 V 3.168/3.135 V(min) 3.432/3.465 V(max) η Efficiency VIN = 12V, ILOAD = 3A 73 % (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits specified 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 ensured via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XH2596 is used as shown in the Figure 20 test circuit, system performance will be as shown in system parameters of Electrical Characteristics section. XH2596-5.0 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range XH2596-5.0 Units Symbol Parameter Conditions Typ Limit (1) (2) (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 20 VOUT Output Voltage 7V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A 5.0 V 4.800/4.750 V(min) 5.200/5.250 V(max) η Efficiency VIN = 12V, ILOAD = 3A 80 % (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits specified 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 ensured via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XH2596 is used as shown in the Figure 20 test circuit, system performance will be as shown in system parameters of Electrical Characteristics section. XH2596-12 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range XH2596-12 Units Symbol Parameter Conditions Typ Limit (1) (2) (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 20 VOUT Output Voltage 15V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A 12.0 V 11.52/11.40 V(min) 12.48/12.60 V(max) η Efficiency VIN = 25V, ILOAD = 3A 90 % (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits specified 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 ensured via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XH2596 is used as shown in the Figure 20 test circuit, system performance will be as shown in system parameters of Electrical Characteristics section. 3 XH2596 TO-263 3.3 5.0 12 ADJ XH2596-ADJ Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range XH2596-ADJ Units Symbol Parameter Conditions Typ Limit (1) (2) (Limits) SYSTEM PARAMETERS (3) Test Circuit Figure 20 VFB Feedback Voltage 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A 1.230 V VOUT programmed for 3V. Circuit of Figure 20 1.193/1.180 V(min) 1.267/1.280 V(max) η Efficiency VIN = 12V, VOUT = 3V, ILOAD = 3A 73 % (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits specified 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 ensured via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the XH2596 is used as shown in the Figure 20 test circuit, system performance will be as shown in system parameters of Electrical Characteristics section. 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 = 500 mA XH2596-XX Units Symbol Parameter Conditions Typ Limit (1) (2) (Limits) DEVICE PARAMETERS Ib Feedback Bias Current Adjustable Version Only, VFB = 1.3V 10 nA 50/100 nA (max) (3) fO Oscillator Frequency See 150 kHz 127/110 kHz(min) 173/173 kHz(max) (4) (5) VSAT Saturation Voltage IOUT = 3A 1.16 V 1.4/1.5 V(max) DC Max Duty Cycle (ON) See (5) 100 % Min Duty Cycle (OFF) See (6) 0 (4)(5) ICL Current Limit Peak Current 4.5 A 3.6/3.4 A(min) 6.9/7.5 A(max) (4)(6) IL Output Leakage Current Output = 0V 50 μA(max) Output = −1V (7) 2 mA 30 mA(max) (6) IQ Quiescent Current See 5 mA 10 mA(max) (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits specified 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 ensured via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) The switching frequency is reduced when the second stage current limit is activated. (4) No diode, inductor or capacitor connected to output pin. (5) Feedback pin removed from output and connected to 0V to force the output transistor switch ON. (6) Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF.