Voltage Regulators AN8018SA 1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC Unit: mm Overview The AN8018SA is a two-channel PWM DC-DC con- 5.00.2 16 9 verter control IC that features low-voltage operation. (1.0) This IC can obtain the step-up, step-down and invert- ing voltages with a small number of external components. The minimum operating voltage is as low as 1.8 V so that it can operate with two dry batteries. In addition, 0 to 10 0.50.2 since it uses the 16-pin surface mounting type package 18 with 0.65 mm pitch, it is suitable for miniaturized highly efficient potable power supply. (0.225) 0.65 Seating plane Features +0.10 0.22 0.05 Wide operating supply voltage range (1.8 V to 14 V) Incorporating a high precision reference voltage circuit SSOP016-P-0225A (allowance: 2%) Control in a wide output frequency range is possible Note) The package of this product will be changed (20 kHz to 1 MHz). to lead-free type (SSOP016-P-0225E). See the Built-in wideband error amplifier (single gain bandwidth package dimensions section later of this 10 MHz typical) datasheet. Built-in timer latch short-circuit protection circuit (charge current 1.1 A typical) Incorporating the under-voltage lock-out circuit (U.V.L.O.) (circuit operation-starting voltage 1.67 V typical) Dead-time is variable. Flatness of switching current can be obtained by staggering the turn-on timing of each channel. Built-in unlatch function When DT1 pin is low level, or DT2 pin is high level, independent turn-off is possible. Incorporating a on/off control function (active-high control input, standby mode current: 5 A maximum) Parallel operation is possible. Output block Totem pole 1 output Output source-current: 50 mA maximum (Constant current output with a less supply voltage fluctuation is possible by connecting an external resistor to pin 11) Output sink-current: +80 mA maximum Open-collector 1 output Output current: 50 mA maximum Applications LCD displays, digital still cameras, and PDAs Publication date: December 2001 SDH00008CEB 1 Maintenance/ Discontinued Maintenance/Discontinued includes following four Product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type Please visit following URL about latest information. AN8018SA Block Diagram V REF 15 1.19 V On/ Reference On/off Triangular wave voltage source off control oscillation V REF 0.9 V 5 FB1 7 Out1 0.2 V PWM1 Error amp. 1 Unlatch1 4 IN1 U.V.L.O. IN+1 3 H L Latch 0.9 V V R CC 11 Q RB2 13 S FB2 S.C.P. V comp. REF 0.22 V Error amp. 2 PWM2 14 10 IN+2 Out2 0.9 V 0.9 V 1.19 V V REF Unlatch2 8 GND Pin Descriptions Pin No. Symbol Description Pin No. Symbol Description 8 GND Grounding pin 1 OSC Pin for oscillation timing resistor and capacitor connection 9V Power supply voltage application pin CC 10 Out2 Out2 block push-pull type output pin 2 S.C.P. Pin for connecting the time constant set- ting capacitor for short-circuit protection 11 RB2 Out2 block output source current setting resistor connection pin 3IN+1 Error amplifier 1 block noninverting input pin 12 DT2 PWM2 block dead-time setting pin 4IN1 Error amplifier 1 block inverting input pin 13 FB2 Output pin of error amplifier 2 block 5 FB1 Output pin of error amplifier 1 block 14 IN+2 Error amplifier 2 block inverting input pin 6 DT1 PWM1 block dead-time setting pin 15 Off On/off control pin 7 Out1 Out1 block open-collector type output pin 16 V Reference voltage output pin REF SDH00008CEB 2 Maintenance/ Discontinued Maintenance/Discontinued includes following four Product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type Please visit following URL about latest information.