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LTC1159-5 数据表(PDF) 5 Page - Linear Technology |
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LTC1159-5 数据表(HTML) 5 Page - Linear Technology |
5 / 20 page 5 LTC1159 LTC1159-3.3/LTC1159-5 PI FU CTIO S SENSE+: The (+) Input for the Current Comparator. A built- in offset between the SENSE+ and SENSE– pins, in conjunc- tion with RSENSE, sets the current trip threshold. N-Gate: High Current Drive for the Bottom N-Channel MOSFET. The N-Gate pin swings from ground to VCC. P-Gate: Level-Shifted Gate Drive Signal for the Top P-Channel MOSFET. The voltage swing at the P-gate pin is from VIN to VIN – VCC. P-Drive: High Current Gate Drive for the Top P-Channel MOSFET. The P-drive pin(s) swing(s) from VCC to ground. CAP: Charge Compensation Pin. A capacitor to VCC pro- vides charge required by the P-gate level-shift capacitor during supply transitions. The charge compensation ca- pacitor must be larger than the gate drive capacitor. SHDN1: This pin shuts down the control circuitry only (VCC is not affected). Taking SHDN1 pin high turns off the control circuitry and holds both MOSFETs off. This pin must be at ground potential for normal operation. SHDN2: Master Shutdown Pin. Taking SHDN2 high shuts down VCC and all control circuitry. VIN: Main Supply Input Pin. SGND: Small-Signal Ground. Must be routed separately from other grounds to the (–) terminal of COUT. PGND: Driver Power Grounds. Connect to source of N- channel MOSFET and the (–) terminal of CIN. VCC: Outputs of internal 4.5V linear regulator, EXTVCC switch, and supply inputs for driver and control circuits. The driver and control circuits are powered from the higher of the 4.5V regulator or EXTVCC voltage. Must be closely decoupled to power ground. CT: External capacitor CT from this pin to ground sets the operating frequency. (The frequency is also dependent on the ratio VOUT/VIN.) ITH: Gain Amplifier Decoupling Point. The current com- parator threshold increases with the ITH pin voltage. VFB: For the LTC1159 adjustable version, the VFB pin receives the feedback voltage from an external resistive divider used to set the output voltage. SENSE–: Connects to internal resistive divider which sets the output voltage in fixed output versions. The SENSE– pin is also the (–) input of the current comparator. EXTVCC Switch Drop Current Sense Threshold Voltage Off-Time vs VOUT SWITCH CURRENT (mA) 0 0 100 200 300 400 500 600 510 15 20 LTC1159 • TPC07 OUTPUT VOLTAGE (V) 1 40 50 60 5 LTC1159 • TPC08 30 20 0 2 34 10 80 70 0 LTC1159-5 LTC1159-3.3 TEMPERATURE ( °C) 20 80 100 120 100 LTC1159 • TPC09 60 40 0 40 60 80 20 160 140 0 MAXIMUM THRESHOLD MINIMUM THRESHOLD TYPICAL PERFOR A CE CHARACTERISTICS |
类似零件编号 - LTC1159-5_15 |
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类似说明 - LTC1159-5_15 |
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