GSC2596M

ISSUED DATE :2006/03/08 REVISED DATE :2006/05/17B GSC2596M 150 KHz, 2A PWM Step-Down DC/DC Converter Description The GSC2596M series of regulators are monolithic integrated circuit that provides all active functions for a step-down (buck) switching regulator, capable of driving 2A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3v, 5v, 12v and an adjustable output version. The GSC2596M series operate at a switching frequency of 150 kHz; thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. The chips are available in a standard 8-lead SOP-8 package. Other feature include a guaranteed D to tolerance on output voltage under specified input voltages and output load 4% 15% is on the oscillator frequency. External shutdown is included, featuring 80uA (Typ.) standby current. The conditions. The 150 kHz D output switch includes cycle-by cycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features & 5.0V, 12V and adjustable output versions 3.3V, & Guaranteed 2A output current & Operating voltage can be up to 22V & 150kHz fixed frequency internal oscillator & Built-in TTL On/Off control & TTL Shutdown Capability & Uses readily available standard inductors & Thermal shutdown and current limit protection Applications & High-efficiency step-down regulator & One-ch switching regulators simple & Positive to negative converter Package Dimensions REF. A B C D E F Millimeter Min. Max. 5.80 4.80 3.80 0° 0.40 0.19 6.20 5.00 4.00 8° 0.90 0.25 REF. M H L J K G Millimeter Min. Max. 0.10 0.25 0.35 0.49 1.35 1.75 0.375 REF. 45° 1.27 TYP. Block Diagram GSC2596M Page: 1/6 ISSUED DATE :2006/03/08 REVISED DATE :2006/05/17B Pin Function Pin Name VIN Output Feedback(FB) ON/OFF(SD) Pin# 1 2 3 4 Function This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching current needed by regulator. Internal switch. The voltage at this pin switches between (+V IN - V SAT) and approximately -0.5V, with a duty cycle of approximately V OUT/V IN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be keep to a minimum. S enses the regulated output voltage to complete the feedback loop. Allows the switching regulator circuit to be shutdown using logic level signals. Thus drop the total input supply current to approximately 150 A. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, ON/OFF pin can be wired to the ground pin. Circuit ground Ground 5,6,7,8 Absolute Maximum Ratings Parameter Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to ground Power Dissipation Storage Temperature Operating temperature Operating Voltage Symbol VCC VSD VFB VOUT PD TST TOP VOP Ratings 24 -0.3 ~ +18 -0.3 ~ +18 -1 Internally Limited -65 ~ +150 -40 ~ +125 +4.5 ~ +22 Unit V V V V W : : V GSC2596M Electrical Characteristics Specifications in boldface type are for f ull operating temperature range. The other type are for TJ=25 : . Parameter Output Feedback Efficiency Symbol VFB Conditions 5 VIN 22V, 0.2A ILOAD 2A VOUT=3V VIN=12V, ILOAD=2A, VOUT=3V Min 1.180/1.168 Typ 1.230 76 Max 1.280/1.292 Unit V % GSC2596M-33 Electrical Characteristics Specifications in boldface type are for f ull operating temperature range. The other type are for TJ=25 : . Parameter Output Feedback Efficiency Symbol VFB Conditions 5.5V VIN 22V 0.2A ILOAD 2A VIN=12V, ILOAD=2A Min 3.168/3.135 Typ 3.3 78 Max 3.432/3.465 Unit V % GSC2596M-50 Electrical Characteristics Specifications in boldface type are for f ull operating temperature range. The other type are for TJ=25 : . Parameter Output Feedback Efficiency Symbol VFB Conditions 8V VIN 22V 0.2A ILOAD 2A VIN=12V, ILOAD=2A Min 4.80/4.75 Typ 5.0 83 Max 5.20/5.25 Unit V % GSC2596M-12 Electrical Characteristics Specifications in boldface type are for f ull operating temperature range. The other type are for TJ=25 : . Parameter Output Feedback Efficiency GSC2596M Symbol VFB Conditions 15V VIN 22V 0.2A ILOAD 2A VIN=16V, ILOAD=2A Min 11.52/11.40 Typ 12 90 Max 12.48/12.60 Unit V % Page: 2/6 ISSUED DATE :2006/03/08 REVISED DATE :2006/05/17B All Output Voltage Version Electrical Characteristics Specifications in boldface type are for f ull operating temperature range. The other type are for TJ=25 : . Parameter Feedback bias current Oscillator frequency Oscillator frequency of short circuit protect Saturation voltage Max. duty cycle (ON) Max. duty cycle (OFF) Current limit Output leakage current Quiescent current ON/OFF pin logic input Threshold Voltage ON/OFF pin Logic input current ON/OFF pin input current Standby quiescent current Thermal Resistance Symbol IFB FOSC FSCP VSAT DC Conditions VFB=1.3V (adjustable version only) W hen current limit occurred and VFB