GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Description Features GM7230 series is designed to provide all the active function for a step-down (buck) switching regulator, and drives a maximum load current as high as 3A line and load regulations. GM7230 is available in fixed output voltages of 3.3V, 5V, and a versatile Adjustable output version. These regulators are simple to use and require minimum number of external components. The features include internal frequency compensation and a fixed-frequency oscillator. The GM7230 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. GM7230 performs well with standard inductors from most of manufacturers, and simplifying the design of switch-mode power supplies. External shutdown is included with 80 µA (typical) standby current. The output switch has cycle-by-cycle current limiting as well as thermal shutdown for full protection under fault conditions. 3.3V, 5V, 12Vand Adjustable output versions Adjustable version output voltage range 1.23V to 37V VOUT accuracy is to ± 2% under specified input voltage the output load conditions Input voltage range up to 40V Requires only 4 external components with High efficiency TTL shutdown capability, low power standby mode Built-in thermal shutdown, current limit protection Uses standard inductors 150 kHz fixed frequency internal oscillator GM7230 operates at a switching frequency of 150 kHz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM7230 series are available in a standard 5-lead TO-220, TO220B and TO263 packages. Application Pre-regulator for linear regulators On-card/board switching regulators High-efficiency step-down buck regulator Positive to negative converter (buck-boost) LCD Monitors Typical Application Circuits GM7230-5.0 Feedback L1 68μH Output CIN 680μF 4 1 VIN GND 3 2 5V regulated output, ON/OFF 5 D1 1N5824 COUT 220μF www.gammamicro.com.tw GM7230V2.02 Unregulated DC Input 1 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Marking Information and Pin Configurations (Top View) TO-220-5 TO-220B-5 TO-263-5 GM7230 VVAYWW GM7230 VVAYWW GM7230 VVAYWW 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN G: Green Product VV: Voltage suffix (15 = 1.5V, 50 = 5.0V…A = Adj) A: Assembly / Test site code Y: Year WW: Week Marking Information and Pin Configurations – Green Products (Top View) TO-220-5 TO-220B-5 TO-263-5 GM7230G VVAYWW GM7230G VVAYWW GM7230G VVAYWW GM7230V2.02 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN 5. ON/OFF 4. Feedback 3. GND 2. Output 1. VIN 2 G: Green Product VV: Voltage suffix (15 = 1.5V, 50 = 5.0V…A = Adj) A: Assembly / Test site code Y: Year WW: Week GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Ordering Information – Pb Free Products Ordering Number Output Voltage Package Shipping TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube GM7230-ATB5BT TO-220-5B 50 Units / Tube GM7230-3.3TA5T TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube TO-220-5B 50 Units / Tube TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel GM7230-5.0TB5T TO-220-5 50 Units / Tube GM7230-12TB5BT TO-220-5B 50 Units / Tube TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube TO-220-5B 50 Units / Tube Package Shipping TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube GM7230-ATB5BTG TO-220-5B 50 Units / Tube GM7230-3.3TA5TG TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube TO-220-5B 50 Units / Tube TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel GM7230-5.0TB5TG TO-220-5 50 Units / Tube GM7230-12TB5BTG TO-220-5B 50 Units / Tube TO-263-5 50 Units / Tube TO-263-5 800 Units / Reel TO-220-5 50 Units / Tube TO-220-5B 50 Units / Tube GM7230-ATA5T GM7230-ATA5R Adj GM7230-ATB5T GM7230-3.3TA5R 3.3 GM7230-3.3TB5T GM7230-3.3TB5BT GM7230-5.0TA5T GM7230-5.0TA5R 5.0 GM7230-12TA5T GM7230-12TA5R 12 GM7230-12TB5T GM7230-12TB5BT Ordering Information – Green Products Ordering Number Output Voltage GM7230-ATA5TG GM7230-ATA5RG Adj GM7230-ATB5TG GM7230-3.3TA5RG 3.3 GM7230-3.3TB5TG GM7230-3.3TB5BTG GM7230-5.0TA5TG GM7230-5.0TA5RG GM7230-12TA5TG GM7230-12TA5RG 12 GM7230-12TB5TG GM7230-12TB5BTG GM7230V2.02 5.0 3 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Absolute Maximum Ratings (Note 1) Rating Value Unit 45 V SD Pin Input Voltage / Feed Back Pin Voltage -0.3 + VIN + 0.3 V Output Voltage to Ground (Steady State) -0.3 + VIN + 0.3 V Internally Limited - 36 ℃/W - 65 to 150 ℃ + 150 ℃ Operating Temperature Range - 40 to 125 ℃ Minimum EDS Rating (Note 2) 2 kV + 260 ℃ Maximum Supply Voltage Power Dissipation Thermal Resistance – Junction to Ambient (JA) ** 2 square inch of FR-4, double sided, 1oz. minimum copper weight, is recommended Storage Temperature Range Maximum Junction Temperature Lead Temperature (Soldering, 10 sec) Block Diagram SD VIN Current Source Bias 1.235V Reference 2.5V Reference Start UP 220 COMP Current Limit 2.5V COMP FB GM R2 220mV 3A Switch AMP COMP Latch Driver R1 = 2.5K Reset GM7230V2.02 For 3.3V, R2 = 4.2K For 5.0V, R2 = 7.6K For Adj, R2 = 0 and R1 = OPEN 4 Freq. Shift 150KHz OSC Thermal Limit OUTPUT GND GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM7230-ADJ (Specifications with standard type face are for T = 25°C, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Output Voltage 4.5V VIN 40V, 0.2A ILOAD 3A, VOUT = 3V Efficiency VIN =12V, ILOAD=2.0A, VOUT = 3V Symbol VOUT Min 1.193 1.180 η Typ 1.230 Max 1.267 1.280 73 Unit V % Electrical Characteristics: GM7230-3.3 (Specifications with standard type face are for T = 25°C, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Output Voltage 4.75V VIN 40V, 0.2A ILOAD 3A Efficiency VIN =12V, ILOAD=2.0A Symbol VOUT Min 3.168 3.135 η Typ 3.300 Max 3.432 3.465 73 Unit V % Electrical Characteristics: GM7230-5.0 (Specifications with standard type face are for T = 25°C, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Output Voltage 7V VIN 40V, 0.2A ILOAD 3A Efficiency VIN =12V, ILOAD=2.0A Symbol VOUT Min 4.800 4.7500 η Typ 5.000 Max 5.200 5.250 80 Unit V % Electrical Characteristics: GM7230-12 (Specifications with standard type face are for T = 25°C, and those with bold face type apply over full Operating Temperature rage) Condition Output Voltage 15V VIN 40V, 0.5A ILOAD 3A Symbol Min Typ 11.52 Efficiency VIN =15V, ILOAD=3.0A VOUT η Max Unit 12.48 12.00 11.40 V 12.60 88 % GM7230V2.02 Parameter 5 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: All Output Voltage Versions (Specifications with standard type face are for TJ = 25°C, and those with bold face type apply over full Operating Temperature rage. Unless otherwise specified, VIN = 12V for 3.3V, 5V, and Adjustable version, and VIN = 24V for 12V version, ILOAD = 500mA) Parameter Condition Symbol Min Typ Feedback Bias Current VFB =1.3V (Adjustable Version Only) Ib - 10 Oscillator Frequency (Note 6) fo Saturation Voltage IOUT = 3A (Notes 7, 8) VSAT Max Duty Cycle (ON) (Note 8) DC 100 Min Duty Cycle (OFF) (Note 9) DC 0 Current Limit Peak Current (Notes 7, 8) lCL Output Leakage Current Output =0V (Notes 7, 9, 10) Max 50 Unit nA 100 127 173 150 110 kHz 173 1.4 - 1.16 Standby Quiescent Current SD Pin = 5V (OFF), Note 10 % % A - - 100 µA - 2 - mA lQ - 5 - mA lSTBY - 70 200 μA Output = -0.9V (Note 10) (Note 9) - 3.4 lL Quiescent Current V 1.5 SD Pin Logic lnput Level Low (ON) VIH - 1.3 0.6 High (OFF) VIL 2.0 1.3 - SD Pin lnput Current VLOGlC = 2.5V (OFF) IH 5 15 μA VLOGlC IL 0.02 5 μA V = 0.5V (ON) Note 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 guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The human body model is a 100pF capacitor discharged through a 1.5KΩresistor into each pin. Note 3: Typical numbers are at 25°C and represent the most likely norm. GM7230V2.02 Note 4: All limits guaranteed 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). 6 Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the GM7230 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 6: The switching frequency is reduced when the second stage current limit is activated. Note 7: No diode, inductor or capacitor connected to output pin. Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version. GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Test Circuit and Layout Guidelines Careful layout is important with any switching regulators. Rapidly switching curren ts associated with wiring inductance generate voltage transients which can cause problems. To minimize inductance and ground loops, the lengths of the leads indicated by heavy lines in Figure 1&2 below should be kept as short as possible. Single point grou nding (as indicated or ground plane construction should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to GM7230, to keep the sensitive feedback wiring short. 4 Feedback 1 VIN VIN Unregulatedd DC Input L1 68μH GM7230-x.x 3 GND CIN 100μF 2 VOUT VOUT D1 5 ON/OFF L O A D COUT 680μF Figure 1 Fixed Ouput Votlage Versions CIN = 470μF, Aluminum Electrolytic COUT = 220μF, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68μH VIN VIN Unregulatedd DC Input CIN 100μF L1 68μH GM7230-A 3 GND VOUT 2 VOUT 5 ON/OFF R2 D1 COUT 680μF Figure 2 Adjustable Ouput Votlage Versions CIN = 470μF, Aluminum Electrolytic COUT = 220μF, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68μH VOUT = VREF (1 + R2/R1) R1 L O A D GM7230V2.02 1 4 Feedback 7 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Typical Performance Characteristics Figure 3. Switch Saturation Voltage Figure 4. Switch Current Limit 1.4 SWlTCH CURRENT LlMlT (A) SATURATlON VOLTAGE (V) 5.5 VlN =12V 1.3 1.2 1.1 TJ = - 40°C 1.0 0.9 0.8 25° C 125 °C 0.7 0.6 VlN = 12V VOUT =5V 5.0 4.5 4.0 3.5 2 1 0 3 -50 4 25 50 75 100 125 ILOAD = 3A 1.0 ILOAD = 1A 0.8 24 16 Switch ON 12 0.6 -50 -25 0 25 50 75 100 JUNCTION TEMPERATURE (°C) 8 Switch OFF 4 0 -50 Figure 7. Shutdown Quiescent Current 4.5V < VIN < 40V ISWITCH = 0 20 SWlTCH CURRENT (mA) INPUT - OUTPUT DIFFERENTIAL (V) L = 33μH RIND = 0.04 VOUT = VREG = 50mV 1.2 0 Figure 6. Operating Quiescent Current Figure 5. Dropout Voltage 1.6 1.4 -25 JUNCTlON TEMPERATURE (°C) SWlTCH CURRENT (A) -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) Figure 8. Minimum Operating Supply Voltage 150 5 VON/OFF = 5V TJ = 25°C SUPPLY VOLTAGE (V) CURRENT (µA) 100 80 TJ = -40°C and 125°C 60 40 20 0 0 10 20 30 SUPPLY VOLTAGE (V) 1 VOUT = 1.23V ILOAD = 120mA 160 VIN = 40V TJ = -40°C and 125°C 155 FREQUENCY (kHz) 7 6 CURRENT(µA) GM7230V2.02 2 Figure 10. Switching Frequency 8 8 3 0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) 40 Figure 9. SD Pin Current (Sinking) 5 4 3 2 150 145 140 135 130 1 0 0 4 5 10 15 20 SD PlN VOLTAGE(V) 25 120 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Package Outline Dimensions – TO-263-5 0.176 – 0.184 (4.47 – 4.67) 0.389– 0.408 (9.88 – 10.18) 0.046 – 0.054 (1.17 – 1.37) 0.061 – 0.069 (1.56 – 1.76) 0.322– 0.339 (8.20 – 8.60) 0.596– 0.612 (15.14 – 15.54) 0.028– 0.036 (0.71 – 0.91) 7° 3° 0.200– 0.216 (5.08 – 5.48) 0 -8° 0.067 Typ. (1.70) 0.224– 0.272 (5.70 – 6.90) 0.092 – 0.108 (2.34 – 2.74) 0.012 – 0.021 (0.31 – 0.53) Package Outline Dimensions – TO-220-5 0.048 – 0.052 (1.22 – 1.32) 0.400 + 0.015 0.400 – 0.005 (0.38+ 0.18) (0.38 +- 0.03) 0.149 – 0.153 (3.78 – 3.89) 0.175 – 0.185 (4.45 – 4.75) 0.100 – 0.120 (2.54 – 3.05) 0.149 – 0.153 (3.78 – 3.89) 0.525 – 0.555 (13.34 – 14.10) 0.030 – 0.040 (0.76 – 1.02) 0.057 – 0.077 (1.45 – 1.96) 0.105 + 0.010 0.105 – 0.010 (2.67 + 0.25) (2.67 +- 0.38) 0.015 + 0.007 0.015 – 0.001 (0.38+ 0.18) (0.38 +- 0.03) GM7230V2.02 0.330 – 0.350 (8.38 – 8.89) 9 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Package Outline Dimensions – TO-220B-5 0.046 – 0.054 (1.17 – 1.37) 0.176 – 0.184 (4.47 – 4.67) 0.394 – 0.408 (10.01 – 10.36) 0.149 – 0.153 (3.79 – 3.89) 0.138 – 0.142 (3.51 – 3.61) 0.327 – 0.366 (8.30 – 9.30) 0.988 – 1.130 (25.1 – 28.7) 0.957 – 1.028 (24.3 – 26.1) 0.049 – 0.142 (1.25 – 3.60) 0.099 – 0.111 (2.52 – 2.82) 0.218 – 0.383 (5.53 – 9.75) 0.150 – 0.254 (3.80 – 6.45) 0.220 typ (1.70 typ) 0.264 – 0.272 (6.70 – 6.90) 0.156 – 0.179 (3.95 – 4.55) 0.299 – 0.337 (7.60 – 8.55) GM7230V2.02 Inches (mm) 10 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Ordering Number GM 7230 A TA5 R APM Gamma Micro Package Type Shipping Type TA5: TO263-5 TB5: TO-220-5 TB5B: TO-220B-5 R: Taping & Reel T: Tube Circuit Type Output Voltage A: Adj 3.3 = 3.3V 5.0 = 5.0V 12 = 12.0V G Blank: Pb-Free G: Green Note: Pb-free products: RoHS compliant and compatible with the current require-ments of IPC/JEDEC J-STD-020. Suitable for use in Pb-free soldering processes with 100% matte tin (Sn) plating. Lead-free (RoHS compliant) Halogen free(Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight) GM7230V2.02 Green products: 11