Panasonic AN8049FHN free download

File name AN8049FHN.pdf

Voltage Regulators AN8049FHN 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC Unit: mm s Overview The AN8049FHN is a three-channel PWM DC-DC converter control IC that features low-voltage operation. This IC can form a power supply that provides two stepup 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 that it can operate from 2 dry-batteries. And also, it is housed in an ultrathin, 4-directionallead SMD-package whose thickness is 0.8 mm maximum and pin-pitch is 0.5 mm therefore it is most suitable for making a power supply small and thin. A 5.2±0.2 5.0±0.1 19 20 13 4.0±0.1 4.2±0.2 3.0±0.1 12 (1.10) 2.0±0.2 12 24 1 R0.3 7 8 8 0.80max. 0.50 , ,, , ,, 13 19 20 (1.10) 24 7 1 0.2±0.1 0.10 3- C 0. 3.0±0.2 4.0±0.1 5 B M S A B 0.10 S Seating plane 0.2±0.1 S s Features QFN024-P-0405 · Wide operating supply voltage range: 1.8 V to 14 V · High-precision reference voltage circuit -- VREF pin voltage: ±1% -- Error amplifier: ±1.5% · Ultrathin surface mounting package for miniaturized and thinner power supplies Package: QFN-24 0.5-mm lead pitch 5.4 mm Ч 4.4 mm Ч t 0.8 mm · 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 VCC -1.4 V 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 µA 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 µA maximum) s Applications · Electronic equipment that requires a power supply system 1 AN8049FHN s Block Diagram CTL1 VREF OSC IN-1 DT1 VCC FB1 Voltage Regulators 22 21 14 5 2 15 Reference voltage supply VREF 1.26 V (Allowance: ±1%) 1.1 mA 7 50 k Triangular wave generator Error amplifier 1 20 k 1.26 V VCC 1.1 mA S.C.P. comp. 0.9 V 50 k50 k 0.7 V V 0.3 V On/off CC control 9 10 6 Off RB1 OUT1 50 k PWM1 1.26 V S.C.P. FB3 23 18 U.V.L.O. R Q S Latch 1.26 V Error 16 amplifier 2 IN+3 17 IN-3 DT3 CTL3 24 3 Error amplifier 3 PWM3 13 30 k OUT3 VREF 1.1 mA 20 k 1.26 V 20 k VCC PWM2 8 11 RB2 OUT2 1.26 V 19 20 1.1 mA 1.26 V VREF 50 k 1 12 30 k CTL2 4 50 k GND IN-2 s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 2 DT2 DT1 CTL3 CTL2 CTL1 Off VREF RB2 RB1 OUT1 OUT2 GND Description Pin No. 13 14 15 16 17 18 19 20 21 22 23 24 OUT3 VCC OSC IN+3 IN-3 FB3 IN-2 FB2 IN-1 FB1 S.C.P. DT3 Description DT2 FB2 Voltage Regulators s Absolute Maximum Ratings Parameter Supply volta