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| GM7230 3A STEP-DOWN VOLTAGE REGULATOR Power Management Description The GM7230 series of regulators provide all the active functions for a step-down (buck) switching regulator, and drive 3A load with excellent line and load regulation. GM7230's are available in fixed output voltages of 3.3V, 5V, 12V, and a versatile Adjustable output version. 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 series are high-efficiency replacements for popular three-terminal linear regulators, requiring a smaller heatsink or even no heatsink. The GM7230's perform well with standard inductors from several manufacturers, simplifying the design of switchmode power supplies. The GM7230 series guarantee 4% tolerance on output voltage within specified input voltages and output load conditions, and 10% on the oscillator frequency. External shutdown is included, with 80 A (typical) standby current. The output switch has cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features 3.3V, 5V, 12V and Adjustable output versions 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 Requires only 4 external components High efficiency TTL shutdown capability, low power standby mode Thermal shutdown, current limit protection Uses standard inductors 150 kHz fixed frequency internal oscillator Application Pre-regulator for linear regulators High-efficiency step-down buck regulator TYPICAL APPLICATIONS Revision 1, Jun. 2004 On-card/board switching regulators Positive to negative converter (buck-boost) 12V Unregulated DC Input +VIN 1 +C IN GM7230 5.0 Feedback 4 Output 2 3 GND L1 68 H + COUT 220 F 5 680 F ON / OFF 5.0V Regulated Output 3A Load D1 1N5824 www.gammamicro.com PRELIMINARY GM7230 1 GM7230 MARKING INFORMATION & PIN CONFIGURATIONS TO-220- 5 TO-220- 5B TO-263-5(D PAK) 2 GM7230 VVAYWW GM7230 VVAYWW GM7230 VVAYWW VIN Output Ground ON/OFF Feedback VIN Output Ground ON/OFF Feedback VIN Output Ground ON/OFF Feedback 1 23 45 ORDERING INFORMATION Ordering Number GM7230-ATB5T GM7230-ATB5BT GM7230-ATA5R GM7230-ATA5T GM7230-3.3TB5T GM7230-3.3TB5BT GM7230-3.3TA5R GM7230-3.3TA5T GM7230-5.0TB5T GM7230-5.0TB5BT GM7230-5.0TA5R GM7230-5.0TA5T GM7230-12TB5T GM7230-12TB5BT GM7230-12TA5R V V / VVV= Output Voltage (33=3.3V , 12=12V, A=Adj) A = Assembly Location Y = Year WW = Work Week Output Voltage Adj Adj Adj Adj 3.3 3.3 3.3 3.3 5.0 5.0 5.0 5.0 12 12 12 12 15 15 15 15 Package TO-220-5 TO-220-5B TO-263-5 TO-263-5 TO-220-5 TO-220-5B TO-263-5 TO-263-5 TO-220-5 TO-220-5B TO-263-5 TO-263-5 TO-220-5 TO-220-5B TO-263-5 TO-263-5 TO-220-5 TO-220-5B TO-263-5 TO-263-5 Shipping 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units/ Tape & Reel 50 Units / Tube GM7230 2 GM7230-12TA5T GM7230-15TB5T GM7230-15TB5BT GM7230-15TA5R GM7230-15TA5T * TB5B: Bent and Staggered Leads of TO-220 package ** For detail Ordering Number identification, please see last page. GM7230 ABSOLUTE MAXIMUM RATINGS Rating Maximum Supply Voltage ON/OFF Pin Input Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature Operating Temperature Range Minimum ESD Rating (C=100pF, R=1.5kW) Lead Temperature (Soldering, 10 sec.) -40 -0.3 Value 45 V -1.0 Internally Limited -65 to + 150 +150 TJ 2 +260 125 +25 Unit V V V - C C C kV C OPERATING CONDITIONS Rating Temperature Range Supply Voltage 45 Value TJ +125 Unit C V 4.5 to 40 BLOCK DIAGRAM ON/ OFF Current Source Bias 1.235V Reference 2.5V Regulator + + COMP Current Limit COMP + + 220 220 mV mV VIN Start Up 2.5V FEEDBACK R2 R1= 2.5K Capacitor COMP + Latch Reset Driver 3.3V,R2=4.2K 5V,R2=7.6K 12V,R2=21.8K ADJ,R2=0W R1=OPEN + OP AMP - FREQ SHIFT 150kHz OSC Thermal Limit OUTPUT GND GM7230 3 + AMP Active - GM 3A Switch GM7230 ELECTRICAL CHARACTERISTICS: GM7230-3.3 (Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range) Parameter Output Voltage Efficiency 4.75 Conditions VIN 40V, 0.2A ILOAD 3A VIN = 12V, ILOAD = 3.0A Symbol VOUT h Min 3.168/3.135 - Typ 3.3 73 Max 3.432/3.465 - Unit V % ELECTRICAL CHARACTERISTICS: GM7230-5.0 (Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range) Parameter Output Voltage Efficiency 7V VIN Conditions 40V, 0.2A ILOAD 3A Symbol VOUT h Min 4.800/4.750 - Typ 5.0 80 Max 5.200/5.250 - Unit V % VIN = 12V, ILOAD = 3.0A ELECTRICAL CHARACTERISTICS: GM7230-12 (Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range) Parameter Output Voltage Efficiency 15V VIN Conditions 40V, 0.2A ILOAD 3A Symbol VOUT h Min 11.52/11.40 - Typ 12.0 90 Max 12.48/12.60 - Unit V % VIN = 25V, ILOAD = 3.0A ELECTRICAL CHARACTERISTICS: GM7230-ADJ (Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range) Parameter Conditions 4.5V VIN 40V, 0.2A ILOAD 3A VOUT = 3V Symbol VOUT h Min 1.193/1.180 - Typ 1.230 73 Max 1.267/1.280 - Unit V % GM7230 Feedback Voltage Efficiency VIN = 12V, ILOAD = 3A, VOUT=3V 4 GM7230 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) Parameter Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Min Duty Cycle (OFF) Current Limit Output Leakage Current Conditions VFB = 1.3V (Adjustable Version Only) (Note 6) IOUT = 3A (Notes 7, 8) (Note 8) (Note 9) Peak Current (Notes 7, 8) (Notes 7, 9, 10) (Notes 10) Output = 0 V Output = -1V (Note 9) ON/OFF Pin = 5V (OFF) (Note 10) TO-220 or TO-263 Package, Junction to Case TO-220 Package, Junction to Ambient (Note 11) Symbol Ib fo VSAT DC DC ICL IL IQ ISTBY qJC qJA qJA qJA qJA VIH VIL IH IL Min 127/110 - Typ 10 150 1.16 100 0 Max 50 / 100 173 / 173 1.4 / 1.5 6.9 / 7.5 50 30 10 200 / 250 0.6 15 5 Unit nA kHz V % % A A mA mA A 3.6 / 3.4 2.0 - 4.5 2 5 80 2 50 50 30 20 1.3 1.3 5 0.02 Quiescent Current Standby Quiescent Current Thermal Resistance TO-263 Package, Junction to Ambient (Note 12) TO-263 Package, Junction to Ambient (Note 13) TO-263 Package, Junction to Ambient (Note 14) C/W ON/OFF Pin Logic Input Level Low (ON) High (OFF) VLOGIC = 2.5V (OFF) V V A A ON/OFF Pin Input Current VLOGIC = 0.5V (ON) 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 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. Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in2 of (1 oz.) copper area. Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in2 of (1 oz.) copper area on the GM7230 side of the board, and approximately 16 in of copper on the other side of the p-c board. 2 2 GM7230 5 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 25C 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. GM7230 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 the GM7230, to keep the sensitive feedback wiring short. Figure 1(a). Fixed Output Voltage Versions +VIN 1 GM 7230FIXED OUTPUT ON/OFF 5 Feedback 4 Output 2 L1 VOUT GND 3 VIN Unregulated DC Input + CIN + D1 COUT I Current meter K1 CIN - 470 F, 50V, Aluminum Electrolytic COUT - 220 F, 25V, Aluminum Electrolytic D1 - 5A, 40V Schottky L1 - 68 H, 3L Electronic Corp. TC-680M-3A-5026 GM7230 6 GM7230 Power Management Figure 1(b). Adjustable Output Voltage Versions Feedback +VIN 1 GND 3 Unregulated DC Input + CIN D1 ON/ OFF 5 4 GM 7230-ADJ Output 2 + COUT R1 R2 L O A D L1 VOUT=5.0V VOUT = VREF ( 1 + VOUT R2 = R1 ( V -1) REF R2 ) R1 where VREF = 1.23V, R1 aproximetly 1kW, 1% CIN - 470 F, 50V, Aluminum Electrolytic COUT - 220 F, 25V, Aluminum Electrolytic D1 - 5A, 40V Schottky L1 - 68 H, 3L Electronic Corp. TC-680M-3A-5026 R1 - 1k , 1% VOUT = 5V, R2 = 3.06k , 1% GM7230 7 GM7230 Typical Performance Characteristics Figure 2. Switch Saturation Voltage 1.4 VIN = 12V SWITCH CURRENT LIMIT (A) 5.5 Figure 3. Switch Current Limit VIN = 12V VOUT = 5V 1.3 SATURATION VOLTAGE (V) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0 1 2 3 4 SWITCH CURRENT (A) 5.0 TJ = - 40C 4.5 25C 4.0 125 C 3.5 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) Figure 4. Dropout Voltage 1.6 INPUT-OUTPUT DIFFERENTIAL (V) L = 33 H RIND = 0.04W VOUT = VREG -50mV Figure 5. Operating Quiescent Current 24 20 16 12 8 Switch OFF 4 Switch ON 4.5V < VIN < 40V SWITCH = 0 1.2 ILOAD = 3A 1.0 ILOAD = 1A 0.8 0.6 -50 SWITCH CURRENT (mA) 1.4 -25 0 25 50 75 100 125 0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) JUNCTION TEMPERATURE (C) Figure 6. Shutdown Quiescent Current 120 VON / OFF = 5V 100 CURRENT (A) 80 TJ = -40C AND 125C 60 40 20 0 0 10 20 30 SUPPLY VOLTAGE (V) 40 Figure 7. Minimum Operating Supply Voltage 5 SUPPLY VOLTAGE (V) TJ = 25C 4 3 2 GM7230 1 VOUT = 1.23V ILOAD = 120 mA -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) 0 -50 8 GM7230 Typical Performance Characteristics Figure 8. ON / OFF Pin Current (Sinking) 8 7 6 CURRENT(A) 5 4 3 2 -40C VIN = 40V TJ 125C FREQUENCY (kHz) 160 155 150 145 140 135 Figure 9. Switching Frequency 1 0 0 5 10 15 20 25 130 -50 -25 0 25 50 75 100 125 ON / OFF PIN VOLTAGE (V) JUNCTION TEMPERATURE (C) GM7230 9 GM7230 Inductor Selection by Manufacturer's Part Numbe. Inductor Value 47H 68H 100H 150H 220H 330H 470H 680H 1000H 1500H 3L Electronic Corp. TC-470M-3A-5026 TC-680M-3A-5026 TC-101M-3A-5026 TC-151M-3A-8026 TC-221M-3A-8026 TC-331M-3A-8026 TC-471M-3A-8026 TC-681M-3A-8026 TC-102M-3A-9426 TC-152M-3A-9426 3L Electronic Corp., + 886(2) 86659999 Website : www.3lcoil.com.tw Capacitor Selection by Manufacturer's Part Number Capacitor Value 100F 220F 470F 680F 1000F Nippon ChemiI - Con Corp. KY50VB100-MH11 KY50VB220-MJ16 KY50VB470-MJ30 KY50VB680-MK30 KY50VB1000-ML25 Nippon Chemi-Con Corp. , + 81(3)54367628 Website : www.chemi-con.co.jp GM7230 10 GM7230 TO-220-5 PACKAGE OUTLINE DIMENSIONS 9.97 0.20 9.90 0.20 3.60 0.20 1.30 0.10 1.70 1.50 DP0.20 9.20 0.20 3.70 0.20 4.60 15.90 0.20 8.70 2.80 0.10 4.50 0.20 8.0 0.20 1.30 -0.05 +0.1 7.0 8.40 1.2 P 3 3 3-R0.2 7.0 0.20 9.20 0.20 3 13.08 0.20 5-0.8 0.10 28.78 MAX 0.50 -0.05 +0.1 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 0.40 15 1.20 3 4.60 1.50 DP0.20 9.20 4.50 1.30 Pad Layout 15.3 0.10 3 2.00 0.75 R0.30 2.40 R0.30 2.54 11.5 0.50 10.0 8.0 7.0 4.40 9 17.5 3.8 1.7 1.20 1.70 TYP (1.70 0.20) 1.75 3 R 0.3 3 0.90 R 0.45 7.2 9.20 Units: mm 15.30 10.00 4.90 Unit: mm GM7230 11 P 4.90 0.80 0.40 1.07 GM7230 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 0.74 0.15 0.05 0.005 1.27 0.1 0.151 0.002 3.84 0.05 0.4985 0.0075 12.66 0.2 0.032 0.004 0.81 0.1 0.213 0.004 5.4 0.1 0.153 0.0035 3.9 0.1 0.220 1.700 0.268 0.004 0.68 0.1 C 0.138 0.004 3.5 0.1 0.05 0.005 1.27 0.1 0.965 0.008 24.5 0.2 0.358 0.008 9.1 0.2 0.996 0.008 25.3 0.2 0.105 0.006 2.76 0.17 0.173 0.006 4.4 0.15 0.331 0.006 0.017 0.005 0.42 0.11 8.4 0.15 ( Inches ) mm ORDERING NUMBER GM 7230 A TB5 T Gamma Micro. Shipping R: Tape & Reel T: Tube Circuit Type GM7230 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 12 |
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