GM2574-5.0S8T

GM2574 1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS Description GM2574 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 1.5A line and load regulations. GM2574 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 GM2574 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. GM2574 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. GM2574 operates at a switching frequency of 52 kHz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM2574 series are available in a standard 8-lead SO package or 8 lead SO package with heat sink. Features Standard SOP8 package 3.3V, 5V, and 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 52 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) T ypical Application Circuits GM2574-5.0 7V – 40V Unregulated DC Input FB 3 1 VIN Output 2 CIN 100µF SD 4 GND 5, 6, 7, 8 D1 1N5822 L1 100µH 5V regulated output, COUT 680µF w ww.gammamicro.com.tw GM2574V1.02 1 GM2574 1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS Marking Information and Pin Configurations (Top View) SO8 GND GND GN D GN D GM2574 VVVAYWW VIN VOUT SD FB VVV: 033=3.3V, 050=5.0V, 00A=ADJ A: Assembly / Testing factory code Y: Year WW: Week Ordering Information Ordering Number GM2574-AS8T GM2574-AS8R GM2574-3.3S8T GM2574-3.3S8R GM2574-5.0S8T GM2574-5.0S8R Output Voltage Adj Adj 3.3 3.3 5.0 5.0 Package SOP8 SOP8 SOP8 SOP8 SOP8 SOP8 Shipping 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel GM2574V1.02 2 GM2574 1.5A 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 FB 3 R2* VIN 1 Regulator With Enable Comparator R1* 5~8 Gnd 52KHz Oscillator Reset 1.23V Reference Thermal Shutdown & Current Limit 2 VOUT Driver Error Amplifier 4 SD VOUT = 3.3V, R1 = 2.49K, R2 = 4.18K VOUT = 5.0V, R1 = 2.49K, R2 = 7.57K VOUT = ADJ, R1 = OPEN, R2 = 0Ω GM2574V1.02 3 GM2574 1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM2574-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 < 1.5A VIN =12V, ILOAD=1.5A, VOUT = 9V Symbol VOUT η Min 1.205 1.180 Typ 1.230 88 Max 1.255 1.280 Unit V % Electrical Characteristics: GM2574-3.3 (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 4.5V < VIN < 40V, 0.2A < ILOAD < 1.5A VIN =12V, ILOAD=1.5A Symbol VOUT η Min 3.163 3.201 Typ 3.300 73 Max 3.390 3.432 Unit V % Electrical Characteristics: GM2574-5.0 (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 4.5V < VIN < 40V, 0.2A < ILOAD < 1.5A VIN =12V, ILOAD=1.5A Symbol VOUT η Min 4.850 4.800 Typ 5.000 77 Max 5.150 5.200 Unit V % GM2574V1.02 4 GM2574 1.5A 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 Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current Condition VFB =5V (Adjustable Version Only) (Note 3) lOUT = 1.5A (Notes 4, 5) (Note 5) Peak Current (Notes 4, 5) Output =0V (Notes 4, 6) Output = -1V (Notes 4, 6) (Note 6) SD Pin = 5V (OFF) Symbol Ib fo VSAT DC lCL Min 42 93 3.6 3.4 Typ 50 52 1.4 98 4.5 Max 100 500 58 1.8 2.0 6.9 7.5 Unit nA kHz V % A lL lQ lSTBY - 7.5 5 50 2 30 10 200 1.0 0.8 mA mA µA Low (ON) SD Pin Logic lnput Level High (OFF) SD Pin lnput Current VLOGlC = 2.5V (OFF) VLOGlC = 0.5V (ON) VIH 2.2 2.4 1.2 V VIL IH IL 1.4 12 0 30 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. The human body model is a 100pF capacitor discharge through a 1.5KΩ resistor into each pin. External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. Where the GM2574 is used as shown in Figure 1&2 test circuits. No diode, inductor or capacitor connected to output pin. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and connected to 12V for the 3.V, 5V and Adj version, to force the output transistor switch OFF. Note 2: Note 3: Note 4: Note 5: Note 6: GM2574V1.02 5 GM2574 1.5A 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 GM2574, to keep the sensitive feedback wiring short. 1 VIN VIN Unregulatedd DC Input CIN 100µF 3 FB GM2574-x.x 5~8 GND 4 SD 2 VOUT L1 100µH D1 COUT 680µF VOUT L O A D Figure 1 Fixed Ouput Votlage Versions CIN = 100µF, Aluminum Electrolytic COUT = 680µF, 25V, Aluminum Electrolytic D1 = Schottky L1 = 100µH 1 VIN VIN Unregulatedd DC Input CIN 100µF 3 FB GM2574-A 5~8 GND 4 SD 2 VOUT L1 100µH VOUT R2 L O A D D1 COUT 680µF R1 GM2574V1.02 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 6 GM2574 1.5A 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 0.053 - 0.059 (1.346 - 1.753) 0.150 - 0.157 (3.810 - 3.988) SEATING PLAN 0.004 - 0.010 (0.012 - 0.254) 0.008 - 0.010 (0.203 - 0.254) 8.0 MAX GM2574V1.02 7 GM2574 1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS O rdering Number G M 2574 A APM Gamma Micro Circuit Type Output Voltage A: Adj 3.3 = 3.3V 5.0 =5.0V S8 Package Type S8: SO 8 R Shipping Type R: Taping & Reel T: Tube GM2574V1.02 8 80 1 6