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ADP1148AR-33 Datasheet(PDF) 4 Page - Analog Devices |
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ADP1148AR-33 Datasheet(HTML) 4 Page - Analog Devices |
4 / 16 page ADP1148, ADP1148-3.3, ADP1148-5 –4– REV. A CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP1148, ADP1148-3.3, ADP1148-5 feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. PIN FUNCTION DESCRIPTIONS Pin # Mnemonic Function 1 P-Channel Drive High Current Gate Drive for Top P-Channel MOSFET. The voltage swing at Pin 4 is from VIN to ground. 2 NC No Connection. 3VIN Input Voltage. 4CT External Capacitor CT from Pin 4 to Ground Sets the Operating Frequency. The frequency is also dependent on the ratio VOUT/VIN. 5 Int VCC Internal Supply Voltage, Nominally 3.3 V. Must be decoupled to signal ground. Do not externally load this pin. 6ITH Error Amplifier Decoupling Point. The current comparator threshold increases with the Pin 7 voltage. 7 Sense– Connects to internal resistive divider that sets the output voltage in ADP1148-3.3 and ADP1148-5 versions. Pin 7 is also the (–) input for the current comparator. 8 Sense+ The (+) Input for the Current Comparator. A built-in offset between Pins 7 and 8, in conjunction with RSENSE, sets the current trip threshold. 9VFB For the ADP1148 adjustable version, Pin 9 serves as the feedback pin from an external resistive divider used to set the output voltage. On ADP1148-3.3 and ADP1148-5 versions, this pin is not used. 10 Shutdown Taking Pin 10 of the ADP1148, ADP1148-3.3 or ADP1148-5 high holds both MOSFETs off. Must be at ground potential for normal operation. 11 Signal GND Small Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. 12 Power GND Driver Power Ground. Connects to source of N-channel MOSFET and the (–) terminal of CIN. 13 NC No Connection. 14 N-Channel Drive High Current Drive for bottom N-channel MOSFET. The voltage swing at Pin 13 is from ground to VIN. PIN CONFIGURATIONS 14-Lead Plastic DIP 14-Lead Plastic SO 14 13 12 11 10 9 8 1 2 3 4 7 6 5 TOP VIEW (Not to Scale) NC = NO CONNECT P-DRIVE SIGNAL GND POWER GND NC N-DRIVE NC VIN CT ADP1148 SENSE(+) VFB* SHUTDOWN INT VCC ITH SENSE(–) *FIXED OUTPUT VERSIONS = SD1 WARNING! ESD SENSITIVE DEVICE |
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