A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR Features Description 3.3V, 5V, 12V and Adjustable output versions GM7230 of regulators provides all the active functions for a step-down (buck) switching regulator, and drives 3A load with excellent line and load regulation. GM7230's is available in fixed output voltages of 3.3V, 5V, 12V, and a versatile Adjustable output version. Adjustable version output voltage range 1.23V to 37V 4% max over line and load conditions 3A output current Input voltage range up to 40V These regulators are simple to use and require a minimum number of external components. 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 heatsink or even no heatsink. Requires only 4 external components High efficiency TTL shutdown capability, low power standby mode GM7230 performs well with standard inductors from several manufacturers, and simplifying the design of switchmode power supplies. GM7230 guarantees ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±15% on the oscillator frequency. Low power standby mode, IQ typically 80 UA Thermal shutdown, current limit protection Uses standard inductors 150 kHz fixed frequency internal oscillator 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. GM7230 operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. Application Pre-regulator for linear regulators On-card/board switching regulators High-efficiency step-down buck regulator Positive to negative converter (buck-boost) 12V Unregulated DC Input +VIN 1 + C IN GM7230 5.0 5 680 µF ON / OFF Feedback 4 Output 2 3 GND L1 68 µH D1 1N5824 + COUT 220 µF 5.0V Regulated Output 3A Load www.gammamicro.com GM7230 V0.11 TYPICAL APPLICATIONS 1 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR MARKING INFORMATION & PIN CONFIGURATIONS TO-220- 5B TO-220- 5 . . . VIN Output Ground 2 TO-263-5(D PAK) GM7230 GM7230 VVAYWW VVAYWW VIN Output Ground ON/OFF Feedback GM7230 VVAYWW ON/OFF Feedback 1 2 3 4 5 VIN Output Ground V V / VVV= Output Voltage (33=3.3V , 12=12V, A=Adj) A = Assembly Location Y = Year WW = Weekly ORDERING INFORMATION GM7230 Ordering Number 2 Output Voltage Package GM7230-ATB5T Adj TO-220-5 50 Units / Tube GM7230-ATB5BT Adj TO-220-5B 50 Units / Tube GM7230-ATA5R Adj TO-263-5 800 Units/ Tape & Reel GM7230-ATA5T Adj TO-263-5 50 Units / Tube GM7230-3.3TB5T 3.3 TO-220-5 GM7230-3.3TB5BT 3.3 TO-220-5B GM7230-3.3TA5R 3.3 TO-263-5 800 Units/ Tape & Reel GM7230-3.3TA5T 3.3 TO-263-5 50 Units / Tube GM7230-5.0TB5T 5.0 TO-220-5 50 Units / Tube GM7230-5.0TB5BT 5.0 TO-220-5B 50 Units / Tube GM7230-5.0TA5R 5.0 TO-263-5 GM7230-5.0TA5T 5.0 TO-263-5 GM7230-12TB5T 12 TO-220-5 GM7230-12TB5BT 12 TO-220-5B Shipping 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube GM7230-12TA5R 12 TO-263-5 800 Units/ Tape & Reel GM7230-12TA5T 12 TO-263-5 50 Units / Tube GM7230-15TB5T 15 TO-220-5 GM7230-15TB5BT 15 TO-220-5B GM7230-15TA5R 15 TO-263-5 800 Units/ Tape & Reel GM7230-15TA5T 15 TO-263-5 50 Units / Tube * TB5B: Bent and Staggered Leads of TO-220 package ** For detail Ordering Number identification, please see last page. ON/OFF Feedback 50 Units / Tube 50 Units / Tube A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR ABSOLUTE MAXIMUM RATINGS Rating Maximum Supply Voltage ON/OFF Pin Input Voltage/ Feed back pin voltage -0.3 Output Voltage to Ground (Steady State) Power Dissipation Value Unit 45 V V V +25 -1.0 V Internally Limited - -65 to + 150 °C +150 °C Storage Temperature Range Maximum Junction Temperature -40 Operating Temperature Range TJ Minimum ESD Rating (C=100pF, R=1.5kW) 125 °C 2 kV Lead Temperature (Soldering, 10 sec.) +260 °C Lead Temperature S Package Vapor Phase (60 secretary.) Infrared (10 secretary.) T Package (Soldering, 10 secretary.) Maximum Junction Temperature +215 +245 +260 +150 °C OPERATING CONDITIONS Rating Unit Value Temperature Range 45 Supply Voltage TJ °C +125 V 4.5 to 40 BLOCK DIAGRAM ON/ OFF 1.235V Reference 2.5V Regulator + COMP Current Limit COMP + 2.5V FEEDBACK R2 R1= 2.5K GM + AMP Active Capacitor 3.3V,R2=4.2K 5V,R2=7.6K 12V,R2=21.8K ADJ,R2=0W R1=OPEN + OP AMP - COMP + + Start Up Latch FREQ SHIFT 150kHz OSC VIN + 220 220 mV mV 3A Switch Driver Reset Thermal Limit OUTPUT GND GM7230 Current Source Bias 3 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS: GM7230-3.3 (Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range) Conditions Parameter Output Voltage 4.75 VIN 40V, 0.2A ILOAD 3A VIN = 12V, ILOAD = 3.0A Efficiency Symbol Min Typ Max Unit VOUT 3.168/3.135 3.3 3.432/3.465 V h - 73 - % ELECTRICAL CHARACTERISTICS: GM7230-5.0 (Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range) Conditions Parameter Output Voltage 7V VIN 40V, 0.2A ILOAD 3A VIN = 12V, ILOAD = 3.0A Efficiency Symbol Min Typ Max Unit VOUT 4.800/4.750 5.0 5.200/5.250 V h - 80 - % ELECTRICAL CHARACTERISTICS: GM7230-12 (Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range) Conditions Parameter Output Voltage 15V VIN 40V, 0.2A ILOAD 3A VIN = 25V, ILOAD = 3.0A Efficiency Symbol Min Typ Max Unit VOUT 11.52/11.40 12.0 12.48/12.60 V h - 90 - % ELECTRICAL CHARACTERISTICS: GM7230-ADJ (Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range) Conditions Parameter Feedback Voltage GM7230 Efficiency 4 4.5V VIN 40V, 0.2A ILOAD 3A VOUT = 3V VIN = 12V, ILOAD = 3A, VOUT=3V Symbol Min Typ Max Unit VOUT 1.193/1.180 1.230 1.267/1.280 V h - 73 - % A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS: All Output Voltage Versions (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, 5.0V and ADJ version and VIN= 24V for 12V version. ILOAD = 500 mA) Conditions Symbol Min Typ Max Unit VFB = 1.3V (Adjustable Version Only) Ib - 10 50 / 100 nA (Note 6) fo 127/110 150 173 / 173 kHz IOUT = 3A (Notes 7, 8) VSAT - 1.16 1.4 / 1.5 V Max Duty Cycle (ON) (Note 8) DC 100 - % Min Duty Cycle (OFF) (Note 9) DC 0 - % Peak Current (Notes 7, 8) ICL 4.5 6.9 / 7.5 A - - 50 µA - 2 30 mA Parameter Feedback Bias Current Oscillator Frequency Saturation Voltage Current Limit (Notes 7, 9, 10) Output = 0 V (Notes 10) Output = -0.9V Output Leakage Current Quiescent Current Standby Quiescent Current (Note 9) IQ - 5 10 mA ON/OFF Pin = 5V (OFF) (Note 10) ISTBY - 80 200 / 250 µA - 2 50 50 30 20 - °C/W TO-263 Package, Junction to Ambient (Note 14) qJC qJA qJA qJA qJA Low (ON) VIH - 1.3 0.6 V High (OFF) VIL 2.0 1.3 - V VLOGIC = 2.5V (OFF) IH - 5 15 µA VLOGIC = 0.5V (ON) IL - 0.02 5 µA TO-220 or TO-263 Package, Junction to Case TO-220 Package, Junction to Ambient (Note 11) Thermal Resistance TO-263 Package, Junction to Ambient (Note 12) TO-263 Package, Junction to Ambient (Note 13) ON/OFF Pin Logic Input Level IL 3.6 / 3.4 ON/OFF Pin Input Current 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 100 pF capacitor discharged through a 1.5k resistor into each pin. Note 3: Typical numbers are at 25°C and represent the most likely norm. 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). 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, and 15V for the 12V version, to force the output transistor switch OFF. Note 10: VIN = 40V. Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a printed circuit board 2 with (1 oz.) copper area of approximately 1 in . Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in2 of (1 oz.) copper area. 2 Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in of (1 oz.) copper area. 2 Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in of (1 oz.) copper area on 2 GM7230 Gm7230 side of the board, and approximately 16 in of copper on the other side of the p-c board. 5 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR TEST CIRCUIT AND LAYOUT GUIDELINES Careful layout is important with any switching regulator. Rapidly switching currents 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 below should be kept as short as possible. Singlepoint grounding (as indicated in Figure 1) 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. Figure 1(a). Fixed Output Voltage Versions GM 7230- +VIN 1 FIXED OUTPUT Feedback 4 L1 Output VOUT 2 GND 3 VIN Unregulated DC Input ON/OFF 5 + + CIN D1 COUT I Current meter K1 CIN - 470 µF, 50V, Aluminum Electrolytic COUT - 220 µF, 25V, Aluminum Electrolytic D1 - 5A, 40V Schottky GM7230 L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026 6 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR Power Management Figure 1(b). Adjustable Output Voltage Versions Feedback +VIN 4 GM 7230-ADJ 1 L1 Output VOUT=5.0V 2 GND 3 ON/ OFF 5 + + CIN D1 R2 COUT R1 VOUT = VREF ( 1 + L O A D R2 ) R1 VOUT R2 = R1 ( V -1) REF where VREF = 1.23V, R1 aproximetly 1kW, 1% CIN - 470 µF, 50V, Aluminum Electrolytic COUT - 220 µF, 25V, Aluminum Electrolytic D1 - 5A, 40V Schottky L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026 R1 - 1k , 1% VOUT = 5V, R2 = 3.06k , 1% GM7230 Unregulated DC Input 7 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR Typical Performance Characteristics Figure 3. Switch Current Limit Figure 2. Switch Saturation Voltage 1.4 5.5 VIN = 12V SWITCH CURRENT LIMIT (A) SATURATION VOLTAGE (V) 1.3 1.2 1.1 TJ = - 40°C 1.0 0.9 0.8 25°C 125 °C VIN = 12V VOUT = 5V 5.0 4.5 4.0 0.7 3.5 -50 0.6 0 1 2 3 4 SWITCH CURRENT (A) 50 75 100 125 Figure 5. Operating Quiescent Current SWITCH CURRENT (mA) INPUT-OUTPUT DIFFERENTIAL (V) 1.2 25 24 L = 33 µH RIND = 0.04W VOUT = VREG -50mV 1.4 0 JUNCTION TEMPERATURE (°C) Figure 4. Dropout Voltage 1.6 -25 ILOAD = 3A 1.0 ILOAD = 1A 0.8 4.5V < VIN < 40V SWITCH = 0 20 16 Switch ON 12 8 Switch OFF 4 0.6 -50 -25 0 25 50 75 100 0 -50 125 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) Figure 6. Shutdown Quiescent Current Figure 7. Minimum Operating Supply Voltage 120 5 VON / OFF = 5V 100 SUPPLY VOLTAGE (V) CURRENT (µA) TJ = 25°C 80 TJ = -40°C AND 125°C 60 40 20 0 GM7230 0 8 10 20 30 SUPPLY VOLTAGE (V) 40 4 3 2 1 0 -50 VOUT = 1.23V ILOAD = 120 mA -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR Typical Performance Characteristics Figure 8. ON / OFF Pin Current (Sinking) 160 8 7 -40°C VIN = 40V TJ 125°C 155 FREQUENCY (kHz) 6 5 4 3 150 145 140 2 135 1 0 0 5 10 15 20 ON / OFF PIN VOLTAGE (V) 25 130 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) GM7230 CURRENT(µA) Figure 9. Switching Frequency 9 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR Inductor Selection by Manufacturer's Part Numbe. Inductor Value 3L Electronic Corp. 47µH TC-470M-3A-5026 68µH TC-680M-3A-5026 100µH TC-101M-3A-5026 150µH TC-151M-3A-8026 220µH TC-221M-3A-8026 330µH TC-331M-3A-8026 470µH TC-471M-3A-8026 680µH TC-681M-3A-8026 1000µH TC-102M-3A-9426 1500µH TC-152M-3A-9426 3L Electronic Corp., + 886(2) 86659999 Website : www.3lcoil.com.tw Capacitor Selection by Manufacturer's Part Number Capacitor Value Nippon ChemiI - Con Corp. 100µF KY50VB100-MH11 220µF KY50VB220-MJ16 470µF 680µF KY50VB470-MJ30 KY50VB680-MK30 1000µF KY50VB1000-ML25 GM7230 Nippon Chemi-Con Corp. , + 81(3)54367628 Website : www.chemi-con.co.jp 10 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR TO-220-5 PACKAGE OUTLINE DIMENSIONS 9.97 ± 0.20 4.50 ± 0.20 9.90 ± 0.20 3.60 ± 0.20 8.0 ± 0.20 8.70 2.80 ± 0.10 7.0 +0.1 1.30 -0.05 4.60 8.40 15.90 ± 0.20 3.70 ± 0.20 1.2 3° 7.0 ± 0.20 28.78 MAX 1.50 DP0.20 9.20 ± 0.20 1.30 ± 0.10 1.70 9.20 ± 0.20 3° 3° 13.08 ± 0.20 3-R0.2 5-0.8 ± 0.10 +0.1 0.50 -0.05 2.40 ± 0.20 1.7(TYP) 3° 3° 2 - R 0.3 Unit: mm 10.00 ± 0.20 TO-263-5 PACKAGE OUTLINE DIMENSIONS 9.90 4.50 1.30 15° 0.40 1.20 3° 4.60 1.50 DP0.20 9.20 Pad Layout 0.10 15.3 3° 2.00 1.20 4.90 17.5 9 2.40 R0.30 0.75 R0.30 1.7 0.80 0.40 11.5 0.50 1.70 TYP (1.70 ± 0.20) 3.8 2.54 10.0 8.0 7.0 4.40 1.07 3° R 0.3 0.90 R 0.45 7.2 Units: mm 9.20 15.30 10.00 4.90 Unit: mm GM7230 1.75 3° 11 A Power Management GM7230 A MICROELECTRONICS 3A STEP-DOWN VOLTAGE REGULATOR TO-220-5B PACKAGE OUTLINE DIMENSIONS 0.18 ± 0.004 4.57 ± 0.1 0.4 ± 0.006 10.16 ± 0.15 0.108 ± 0.006 2.74 ± 0.15 0.05 ± 0.004 1.27 ± 0.1 0.151 ± 0.002 3.84 ± 0.05 0.05 ± 0.004 1.27 ± 0.1 0.4985 ± 0.0075 12.66 ± 0.2 0.032 ± 0.004 0.81 ± 0.1 0.358 ± 0.008 9.1± 0.2 0.9645 ± 0.0075 24.5 ± 0.2 0.996 ± 0.008 25.3± 0.2 0.138 ± 0.004 3.5 ± 0.1 0.105 ± 0.006 2.76± 0.15 0.1535 ± 0.0035 3.9 ± 0.1 0.213 ± 0.004 5.4 ± 0.1 0.220 TYP 1.700 TYP 0.268 ± 0.004 0.68 ± 0.1 0.173 ± 0.006 4.4 ± 0.15 0.331 ± 0.006 8.4 ± 0.15 0.0165 ± 0.0045 0.42 ± 0.11 ( Inches ) mm ORDERING NUMBER GM 7230 A TB5 T Shipping R: Tape & Reel T: Tube Gamma Micro. GM7230 Circuit Type 12 Package TA5: TO-263-5 TB5: TO-220-5 TB5B: TO-220-5B Output Voltage A: Adj, 3.3: 3.3V 5.0: 5.0V, 12: 12V 15: 15V A 3A STEP-DOWN VOLTAGE REGULATOR GM7230 A MICROELECTRONICS Power Management GM7230 13