GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Description Features GM2576 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. GM2576 is available in fixed output voltages of 3.3V, 5V, and a versatile Adjustable output version. Standard SOP8 & PSOP8 and 5L TO252 packages are available 3.3V, 5V, and Adjustable output versions Adjustable version output voltage range 1.23V to 37V These regulators are simple to use and require minimum number of external components. The features include internal frequency compensation and a fixed-frequency oscillator. VOUT accuracy is to ±1.8% under specified input voltage and output load conditions Input voltage range up to 40V The GM2576 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. Requires only 4 external components with High efficiency TTL shutdown capability, low power standby mode GM2576 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. Built-in thermal shutdown, current limit protection Uses standard inductors 52 kHz fixed frequency internal oscillator GM2576 operates at a switching frequency of 52 kHz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM2576 series are available in a standard 8-lead SO package, 8 lead SO package with heat sink or 5L TO252 package. Application Pre-regulator for linear regulators On-card/board switching regulators High-efficiency step-down buck regulator Positive to negative converter (buck-boost) Typical Application Circuits GM2576-5.0 FB VIN Output CIN 100µF SD L1 100µH 5V regulated output, GND D1 1N5822 COUT 680µF www.gammamicro.com.tw GM2576V1.30 7V – 40V Unregulated DC Input 1 GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Marking Information and Pin Configurations (Top View) SO8 & PSO8 GND GND 5L TO-252 GND GND GM2576G VVAYWW GM2576 VVVAYWW SD FB VVV: 033=3.3V, 050=5.0V, 00A=ADJ A: Assembly / Testing factory code Y: Year WW: Week 5.SD 4.FB 3.GND 2. VOUT 1. VIN VIN VOUT VV: 33=3.3V, 50=5.0V, A=ADJ A: Assembly / Testing factory code Y: Year WW: Week Ordering Information GM2576V1.30 Ordering Number 2 Output Voltage Package Shipping GM2576-AS8T Adj SOP8 100 Units / Tube GM2576-AS8R Adj SOP8 2500 Units / Reel GM2576-APS8T Adj PSOP8 100 Units / Tube GM2576-APS8R Adj PSOP8 2500 Units / Reel GM2576-ATC5RG Adj 5L-TO252 50 Units / Tube GM2576-3.3S8T 3.3 SOP8 100 Units / Tube GM2576-3.3S8R 3.3 SOP8 2500 Units / Reel GM2576-3.3PS8T 3.3 PSOP8 100 Units / Tube GM2576-3.3PS8R 3.3 PSOP8 2500 Units / Reel GM2576-3.3TC5RG 3.3 5L-TO252 50 Units / Tube GM2576-5.0S8T 5.0 SOP8 100 Units / Tube GM2576-5.0S8R 5.0 SOP8 2500 Units / Reel GM2576-5.0PS8T 5.0 PSOP8 100 Units / Tube GM2576-5.0PS8R 5.0 PSOP8 2500 Units / Reel GM2576-3.3TC5RG 5.0 5L-TO252 50 Units / Tube GM2576 2A 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 (θJA) ** 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 VIN FB R2* Regulator With Enable Error Amplifier Comparator SD Driver R1* 1.23V Reference Gnd 52KHz Oscillator Reset Thermal Shutdown & Current Limit VOUT GM2576V1.30 VOUT = 3.3V, R1 = 2.49K, R2 = 4.18K VOUT = 5.0V, R1 = 2.49K, R2 = 7.57K VOUT = ADJ, R1 = OPEN, R2 = 0Ω 3 GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM2576-ADJ (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Feedback Voltage Efficiency Condition Symbol VIN =12V, ILOAD = 0.2A, VOUT is set to 5V 4.5V < VIN < 40V, 0.2A < ILOAD < 2A, VOUT is set to 5V VIN =12V, ILOAD=2.0A, VOUT = 5V VFB Min Typ Max 1.217 1.230 1.243 1.208 1.180 η 1.230 Unit V 1.252 1.280 77 % Electrical Characteristics: GM2576-3.3 (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Output Voltage 4.5V < VIN < 40V, 0.2A < ILOAD < 2A Efficiency VIN =12V, ILOAD=2.0A, Symbol VOUT Min 3.163 3.201 η Typ 3.300 Max Unit 3.390 V 3.432 73 % Electrical Characteristics: GM2576-5.0 GM2576V1.30 (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) 4 Parameter Condition Output Voltage 4.5V < VIN < 40V, 0.2A < ILOAD < 2A Efficiency VIN =12V, ILOAD=2.0A Symbol VOUT η Min 4.850 4.800 Typ 5.000 77 Max 5.150 5.200 Unit V % GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: All Output Voltage Versions (Specifications with standard type face are for T = 25℃, and those with bold face type apply over full Operating Temperature rage) Parameter Condition Symbol Min Typ Feedback Bias Current VFB =5V (Adjustable Version Only) Ib - 50 Oscillator Frequency (Note 3) fo 42 52 Saturation Voltage lOUT = 2A (Notes 4, 5) VSAT - 1.4 Max Duty Cycle (ON) (Note 5) DC Current Limit Peak Current (Notes 4, 5) lCL 100 Unit nA 500 58 1.8 kHz V 2.0 93 3.6 98 4.5 3.4 Output Leakage Current Max Output =0V (Notes 4, 6) Output = -1V (Notes 4, 6) Quiescent Current (Note 6) Standby Quiescent Current SD Pin = 5V (OFF) Low (ON) lL - 6.9 A 7.5 7.5 2 mA 30 lQ - 5 10 mA lSTBY - 50 200 µA VIH - 1.2 1.0 0.8 SD Pin Logic lnput Level High (OFF) % VIL 2.2 1.4 - V 2.4 VLOGlC = 2.5V (OFF) IH 12 30 VLOGlC = 0.5V (ON) IL 0 10 µA Note 1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Note 2: The human body model is a 100pF capacitor discharge through a 1.5KΩ resistor into each pin. Note 3: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. Where the GM2576 is used as shown in Figure 1&2 test circuits. Note 4: No diode, inductor or capacitor connected to output pin. Note 5: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 6: Feedback pin removed from output and connected to 12V for the 3.V, 5V and Adj version, to force the output transistor switch OFF. GM2576V1.30 SD Pin lnput Current 5 GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Test Circuit and Layout Guidelines Careful 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 GM2576, to keep the sensitive feedback wiring short. FB VIN GM2576-x.x L1 100µH VOUT VOUT D1 VIN Unregulatedd DC Input CIN 100µF L O A D COUT 680µF SD GND Figure 1 Fixed Ouput Votlage Versions CIN = 100µF, Aluminum Electrolytic COUT = 680µF, 25V, Aluminum Electrolytic D1 = Schottky L1 = 100µH FB VIN L1 100µH GM2576-A VOUT VOUT GM2576V1.30 VIN Unregulatedd DC Input 6 R2 CIN 100µF GND SD D1 COUT 680µF Figure 2 Adjustable Ouput Votlage Versions CIN = 100µF, Aluminum Electrolytic COUT = 680µF, 25V, Aluminum Electrolytic D1 = Schottky L1 = 100µH VOUT = VREF (1 + R2/R1) where VREF = 1.23V and R1 is between 1K to 5K R1 L O A D GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Package Outline Dimensions – SO 8 0.189 - 0.197 (4.800 - 5.004) 0.228 - 0.244 (5.791 - 6.198) 0.016 - 0.050 (0.406 - 0.270) D 0.014 - 0.020 (0.356 - 0.508) 0.050 (1.270) TYP 0.150 - 0.157 (3.810 - 3.988) 0.053 - 0.059 (1.346 - 1.753) SEATING PLAN 0.004 - 0.010 (0.012 - 0.254) 0.008 - 0.010 (0.203 - 0.254) 8.0 MAX Package Outline Dimensions – PSO 8 0.189 - 0.197 (4.800 - 5.004) 0.090 (2.286) 0.095 - 0.130 0.228 - 0.244 (2.410 - 3.300) (5.791 - 6.198) 0.016 - 0.050 (0.406 - 0.270) 0.050 (1.270) TYP 0.150 - 0.157 (3.810 - 3.988) 0.053 - 0.059 (1.346 - 1.753) SEATING PLAN 0.004 - 0.010 (0.012 - 0.254) 0.008 - 0.010 (0.203 - 0.254) 8.0 MAX GM2576V1.30 D 0.014 - 0.020 (0.356 - 0.508) 7 GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Package Outline Dimensions – 5L TO252 0.250 – 0.262 (6.350 – 6.650) 0.087 – 0.094 (2.200 – 2.400) 0.205 – 0.213 (5.200 – 5.400) 0.374 – 0.390 (9.500 – 9.900) 0.017 – 0.023 (0.430 – 0.580) 0.150 REF (3.800) 0.213 – 0.224 (5.400 – 5.700) 0.000 – 0.005 (0.000 – 0.127) 0.100 – 0.114 (2.550 – 2.900) 0.050 TYP. (1.27) 0.016 – 0.024 (0.400 – 0.600) GM2576V1.30 1.00 TYP. (2.540) 8 0.055 – 0.070 (1.400 – 1.780) 0.017 – 0.023 (0.430 – 0.580) GM2576 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Ordering Number GM 2576 A APM Gamma R Output Voltage Package Type Shipping Type A: Adj 3.3 = 3.3V 5.0 =5.0V S8: SO 8 PS8: Power SO 8 TA5: 5L TO252 R: Taping & Reel T: Tube GM2576V1.30 Micro Circuit Type S8 8 10 6 9