GM7230-ATB5T

GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Description 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 2A 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. 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. Features 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 Application Pre-regulator for linear regulators High-efficiency step-down buck regulator On-card/board switching regulators Positive to negative converter (buck-boost) LCD Monitors Typical Application Circuits GM7230-5.0 Unregulated DC Input Feedback 1 VIN Output 2 CIN 680µF GND 3 ON/OFF 5 D1 1N5824 COUT 220µF 4 L1 68µH 5V regulated output, w ww.gammamicro.com.tw GM7230V1.10 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 1. VIN 2. Output 4. Feedback 3. GND 5. ON/OFF 1. VIN 2. Output 4. Feedback 3. GND 5. ON/OFF 1. VIN VV: Voltage suffix (15 = 1.5V, 50 = 5.0V…A = Adj) A: Assembly / Test site code Y: Year WW: Week 2. Output 4. Feedback 3. GND 5. ON/OFF GM7230V1.10 2 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Ordering Information Ordering Number GM7230-ATA5T GM7230-ATA5R GM7230-ATB5T GM7230-ATB5BT GM7230-3.3TA5T GM7230-3.3A5R GM7230-3.3B5T GM7230-3.3B5BT GM7230-5.0TA5T GM7230-5.0A5R GM7230-5.0B5T GM7230-12B5BT GM7230-12TA5T GM7230-12A5R GM7230-12B5T GM7230-12B5BT 12 5.0 3.3 Adj Output Voltage Package 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 Shipping 50 Units / Tube 800 Units / Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units / Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units / Reel 50 Units / Tube 50 Units / Tube 50 Units / Tube 800 Units / Reel 50 Units / Tube 50 Units / Tube GM7230V1.10 3 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Absolute Maximum Ratings (Note 1) Rating Maximum Supply Voltage SD Pin Input Voltage / Feed Back Pin Voltage Output Voltage to Ground (Steady State) Power Dissipation Thermal Resistance – Junction to Ambient (θJA) Storage Temperature Range Maximum Junction Temperature Operating Temperature Range Minimum EDS Rating (Note 2) Lead Temperature (Soldering, 10 sec) ** 2 square inch of FR-4, double sided, 1oz. minimum copper weight, is recommended Value 45 -0.3 + VIN + 0.3 -0.3 + VIN + 0.3 Internally Limited 36 - 65 to 150 + 150 - 40 to 125 2 + 260 Unit V V V ℃/W ℃ ℃ ℃ kV ℃ B lock Diagram SD VIN Current Source Bias 1.235V Reference 2.5V Reference Start UP COMP 2.5V Current Limit COMP GM R2 AMP COMP R1 = 2.5K Reset Freq. Shift 150KHz OSC Thermal Limit OUTPUT Latch Driver 2A Switch 220mV 220 For 3.3V, R2 = 4.2K For 5.0V, R2 = 7.6K For Adj, R2 = 0 and R1 = OPEN GND GM7230V1.10 4 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM7230-ADJ (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Output Voltage Efficiency Condition 4.5V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A, VOUT = 3V Symbol VOUT η Min 1.193 1.180 Typ 1.230 88 Max 1.267 1.280 Unit V % Electrical Characteristics: GM7230-3.3 (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Output Voltage Efficiency Condition 4.75V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A Symbol VOUT η Min 3.168 3.135 Typ 3.300 73 Max 3.432 3.465 Unit V % Electrical Characteristics: GM7230-5.0 (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Output Voltage Efficiency Condition 7V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A Symbol VOUT η Min 4.800 4.7500 Typ 5.000 80 Max 5.200 5.250 Unit V % Electrical Characteristics: GM7230-12 (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Output Voltage Efficiency Condition 15V < VIN < 40V, 0.5A < ILOAD < 3A VIN =15V, ILOAD=3.0A Symbol VOUT η Min 11.52 11.40 Typ 12.00 88 Max 12.48 12.60 Unit V % GM7230V1.10 5 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: All Output Voltage Versions (Specifications with standard type face are for TJ = 25℃, and those with bold face type apply over full Operating Temperature rage. Unless otherwise specified, VIN = 12V) Parameter Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Min Duty Cycle (OFF) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current SD Pin Logic lnput Level SD Pin lnput Current Condition VFB =1.3V (Adjustable Version Only) Symbol Ib Min 127 110 Typ 10 Max 50 100 173 173 Unit nA (Note 6) fo 150 kHz IOUT = 2A (Notes 7, 8) (Note 8) (Note 9) Peak Current (Notes 7, 8) Output =0V (Notes 7, 9, 10) Output = -0.9V (Note 10) (Note 9) SD Pin = 5V (OFF), Note 10 Low (ON) High (OFF) VLOGlC = 2.5V (OFF) VLOGlC = 0.5V (ON) VSAT DC DC lCL lL lQ lSTBY VIH VIL IH IL - 1.16 100 0 1.4 1.5 - V % % A 3.4 2.0 2 5 70 1.3 1.3 5 0.02 100 200 0.6 15 5 µA mA mA µA V µA µA 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. 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. GM7230V1.10 6 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS T est Circuit and Layout Guidelines C areful layout is important with any switching regulators. 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&2 below should be kept as short as possible. Single point grounding (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. 1 VIN VIN Unregulatedd DC Input CIN 100µF 4 Feedback GM7230-x.x 3 GND 5 ON/OFF 2 VOUT D1 L1 68 µ H VOUT COUT 680µF L O A D Figure 1 Fixed Ouput Votlage Versions CIN = 470µF, Aluminum Electrolytic COUT = 220µF, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68µH 1 VIN VIN Unregulatedd DC Input CIN 100µF 4 Feedback GM7230-A 3 GND 5 ON/OFF 2 VOUT D1 L1 68 µ H VOUT R2 COUT 680µF L O A D R1 CIN = 470µF, Aluminum Electrolytic COUT = 220µF, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68µH VOUT = VREF (1 + R2/R1) GM7230V1.10 7 Figure 2 Adjustable Ouput Votlage Versions GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS T ypical Performance Characteristics Figure 3. Switch Saturation Voltage 1.4 1.3 SATURATlON VOLTAGE (V) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 25° C 125 °C TJ = - 40°C VlN =12V S WlTCH CURRENT LlMlT ( A) 5.5 Figure 4. Switch Current Limit VlN = 12V VOUT =5V 5.0 4.5 4.0 0 1 2 3 4 3.5 -50 -25 0 25 50 75 100 125 SWlTCH CURRENT (A) JUNCTlON TEMPERATURE (°C) Figure 5. Dropout Voltage 1.6 INPUT - OUTPUT DIFFERENTIAL 1.4 1.2 1.0 ILOAD = 1A 0.8 0.6 -50 -25 0 25 50 75 100 JUNCTION TEMPERATURE (°C) L = 33µH RIND = 0.04 VOUT = VREG = 50mV ILOAD = 2A Figure 6. Operating Quiescent Current 24 20 SWlTCH CURRENT (mA) 16 12 8 Switch OFF 4 0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) Switch ON 4.5V < VIN < 40V ISWITCH = 0 Figure 7. Shutdown Quiescent Current 150 100 CURRENT (µA) 80 60 40 20 0 0 TJ = 25°C TJ = -40°C and 125°C VON/OFF = 5V Figure 8. Minimum Operating Supply Voltage 5 4 3 2 1 VOUT = 1.23V ILOAD = 120mA SUPPLY VOLTAGE (V) 40 FREQUENCY (kHz) 25 10 20 30 SUPPLY VOLTAGE (V) 0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) Figure 9. SD Pin Current (Sinking) 8 Figure 10. Switching Frequency 160 155 150 145 140 135 130 GM7230V1.10 7 6 CURRENT(µA) 5 4 3 2 1 0 0 5 10 VIN = 40V TJ = -40°C and 125°C 15 20 8 SD PlN VOLTAGE(V) 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 0.389 - 0.408 (9.88 - 10.18) 0.061 - 0.069 (1.56 - 1.76) 0.176 - 0.184 (4.47 - 4.67) 0.046 - 0.054 (1.17 - 1.37) 0.322 - 0.339 (8.20 - 8.60) 0.028 - 0.036 (0.71 - 0.91) 0.596 - 0.612 (15.14 - 15.54) 7 3 0.200 - 0.216 (5.08 - 5.48) 0-8 0.224 - 0.272 (5.70 - 6.90) 0.067 typ (1.70) o o 0.092 - 0.108 (2.34 - 2.74) 0.012 - 0.021 (0.31 - 0.53) Package Outline Dimensions – TO-220-5 0.400 + 0.015 0.400 - 0.005 (0.38 + 0.18) (0.38 - 0.03) 0.100 - 0.120 (2.54 - 3.05) 0.149 - 0.153 (3.78 - 3.89) 0.048 - 0.052 (1.22 - 1.32) 0.175 - 0.185 (4.45 - 4.75) 0.240 - 0.260 (6.10 - 6.60) 0.330 - 0.350 (8.38 - 8.89) 0.525 - 0.555 (13.34 - 14.10) 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) GM7230V1.10 9 GM7230 150KHz, 3A STEP DOWN VOLTAGE SWITCHING REGULATORS O rdering Number G M 7230 A APM Gamma Micro Circuit Type Output Voltage A: Adj 3.3 = 3.3V 5.0 = 5.0V 12 = 12.0V TA5 Package Type TA5: TO263-5 TB5: TO-220-5 TB5B: TO-220B-5 R Shipping Type R: Taping & Reel T: Tube GM7230V1.10 8 10 0 1 6