AN8049SH-E1 Panasonic

Voltage Regulators AN8049SH 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC Unit : mm Overview 1 24 The AN8049SH 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 step- up outputs and one step-down or polarity inverted output 12 13 with a minimal number of external components. The AN8049SH features the ability to operate from a supply voltage as low as 1.8 V, and thus can be operated from two dry-batteries. (0.5) 5.50.3 Features 7.50.3 Wide operating supply voltage range: 1.8 V to 14 V High-precision reference voltage circuit SSOP024-P-0300A V pin voltage: 1% REF Error amplifier: 1.5% Note) The package of this product will be changed Surface mounting package for miniaturized and thinner to lead-free type (SSOP024-P-0300D). See the power supplies new package dimensions section later of this Supports control over a wide output frequency range: 20 kHz to 1 MHz datasheet. 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) Alternate package versions also available. Part No.: AN8049FHN Package: QFN024-P-0405A (Lead-free package) 0.5-mm lead pitch Width 5.20 mm 0.10 mm Depth 4.20 mm 0.10 mm Thickness 0.8 mm (max.) Applications Electronic equipment that requires a power supply system Publication date: December 2001 SDH00012BEB 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. AN8049SH Block Diagram Reference voltage Sawtooth wave generator supply V REF 0.7 V 1.26 V V CC (Allowance: 1%) 0.3 V On/off control 11 Error 20 k RB1 amplifier 1 1.26 V 55 k 12 OUT1 V CC 1.26 V PWM1 U.V.L.O. 1.1 A 1 S.C.P. R Q S.C.P. comp. S 20 Latch FB3 Error 1.26 V 15 amplifier 2 0.9 V PWM3 OUT3 18 IN+3 19 IN3 V REF 2 DT3 1.1 A V 5 CC CTL3 10 Error 20 k RB2 PWM2 amplifier 3 1.26 V 13 OUT2 1.1 A V 1.26 V REF 45 k 14 GND 55 k 1.26 V Pin Descriptions Pin No. Symbol Description Pin No. Symbol Description 1 S.C.P. Connection for the capacitor that 12 OUT1 OUT1 block push-pull output provides the short-circuit protection 13 OUT2 OUT2 block push-pull output circuit time constant 14 GND Ground 2 DT3 Channel 3 soft start setting 15 OUT3 OUT3 block open-collector output 3 DT2 Channel 2 soft start setting 16 V Supply voltage CC 4 DT1 Channel 1 soft start setting 17 OSC Oscillator circuit timing resistor and 5 CTL3 Channel 3 on/off control capacitor connection 6 CTL2 Channel 2 on/off control 18 IN+3 Error amplifier 3 noninverting input 7 CTL1 Channel 1 on/off control 19 IN3 Error amplifier 3 inverting input 8 Off On/off control 20 FB3 Error amplifier 3 output 9V Reference voltage output REF 21 IN2 Error amplifier 2 inverting input 10 RB2 Connection for the OUT2 block 22 FB2 Error amplifier 2 output output source current setting resistor 23 IN1 Error amplifier 1 inverting input 11 RB1 Connection for the OUT1 block output source current setting resistor 24 FB1 Error amplifier 1 output SDH00012BEB 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.