AN8049FHN-EB Panasonic

(0.15) Voltage Regulators AN8049FHN 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC Unit: mm 5.200.10 (5.00) Overview 19 13 20 The AN8049FHN is a three-channel PWM DC-DC 12 converter control IC that features low-voltage operation. 8 24 This IC can form a power supply that provides two step- 1 7 R0.30 up outputs and one step-down or polarity inverted output with a minimal number of external components. Minimal operating supply voltage of this IC is as low as 1.8 V, so Seating plane 0.10 that it can operate from 2 dry-batteries. 4.000.10 (1.10) (0.77) 1 7 8 Features 24 Wide operating supply voltage range: 1.8 V to 14 V 20 12 High-precision reference voltage circuit 19 13 (0.44) 0.600.10 V pin voltage: 1% 0.50 REF 0.200.06 M 0.10 Error amplifier: 1.5% QFN024-P-0405A (Lead-free package) Ultrathin surface mounting package for miniaturized and thinner power supplies Supports control over a wide output frequency range: 20 kHz to 1 MHz On/off (sequence control) pins provided for each channel for easy sequence control setup The negative supply error amplifier supports 0-volt input. Common-mode input voltage range: 0.1 V to V 1.4 V CC This allows the number of external components to be reduced by two resistors. Fixed duty factor: 86% However, the duty can be adjusted to anywhere from 0% to 100% with an external resistor. Timer latch short-circuit protection circuit (charge current: 1.1 A typical) Low input voltage malfunction prevention circuit (U.V.L.O.) (operation start voltage: 1.67 V typical) Standby function (active-high control input, standby mode current: 1 A maximum) Applications Electronic equipment that requires a power supply system Publication date: December 2001 SDH00011BEB 1 3-C0.50 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. AN8049FHN Block Diagram Reference voltage Triangular wave generator supply V REF 1.26 V 0.7 V V CC 0.3 V (Allowance: 1%) On/off control 9 Error 20 k RB1 amplifier 1 1.26 V 50 k 10 OUT1 V CC 1.26 V PWM1 U.V.L.O. 1.1 mA 23 S.C.P. R Q S.C.P. comp. S 18 Latch FB3 Error 1.26 V 13 amplifier 2 0.9 V PWM3 OUT3 16 IN+3 17 IN3 V REF 24 DT3 1.1 mA 3 V CC CTL3 8 Error 20 k RB2 PWM2 amplifier 3 1.26 V 11 OUT2 V 1.26 V 1.1 mA REF 50 k 12 GND 50 k 1.26 V Pin Descriptions Pin No. Description Pin No. Description 1 DT2 13 OUT3 2 DT1 14 V CC 3 CTL3 15 OSC 4 CTL2 16 IN+3 5 CTL1 17 IN3 6 Off 18 FB3 7V 19 IN2 REF 8 RB2 20 FB2 9 RB1 21 IN1 10 OUT1 22 FB1 11 OUT2 23 S.C.P. 12 GND 24 DT3 SDH000011BEB 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.