AIC1845 ETC2 [List of Unclassifed Manufacturers], AIC1845 Datasheet
AIC1845
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AIC1845 Summary of contents
Page 1
... The AIC1845 operates as a PSM (Pulse Skipping Modulation) mode switched capacitor voltage doubler to produce a regulated output and features with thermal shutdown capability and short circuit protection. The AIC1845 is available in a 6-pin SOT-23 package. V OUT ** ...
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... ORDERING INFORMATION AIC1845XXXX PACKING TYPE TR: TAPE & REEL BG: BAG PACKAGE TYPE G: SOT-23-6 C: COMMERCIAL P: LEAD FREE COMMERCIAL Example: AIC1845CGTR in SOT-23-6 Package & Taping & Reel Packing Type AIC1845PGTR in Lead Free SOT-23-6 Package & Taping & Reel Packing Type SOT-23-6 Marking Part No. Marking ...
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... I =50mA V OUT R η =2. =30mA OUT f OSC =3V 0mA ON OUT =3V 0V, OUT =25°C. Specifications over the -40°C to 85°C operating A AIC1845 MIN. TYP. MAX. UNIT 2.7 5.0 V 4.8 5.0 5.2 V 4.8 5.0 5 µ µA 0.01 1 650 KHz 1.4 V 0.3 V µA ...
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... Fig Load Supply Current vs. Supply Voltage 5.2 5.1 5.0 V =3.6V IN 4.9 4.8 4.7 T =25° FLY 4.6 C OUT 4 120 140 160 100 =3. 0.01 10 100 AIC1845 T =-40° =85 ° =25°C A =0µA =1µ 3.0 3.5 4.0 4.5 5.0 Supply Voltage (V) V =3. =3.3V IN =0.22 µ =2.7V IN =2.2 µ =3. ...
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... V =2.5V IN 5.00 4.95 4.90 4.85 80 100 120 140 -60 220 200 180 160 140 120 100 4.5 5.0 2.5 Fig. 12 Short-Circuit Current vs. Supply Voltage AIC1845 (Continued) V =3. =3.3V IN =2.2 µ =3.0V OUT IN V =2.7V C =0.22µF IN FLY 100 120 Output Current (mA) Fig. 8 Output Current vs. Output Ripple V =3 ...
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... IN OUT OUT =1 µ =3.0V, I FLY IN I OUT V OUT =1 µ =3.0V, I FLY IN V OUT SHDN =10 µ F AIC1845 (Continued OUT Fig. 14 Output Ripple =2.2 µ =0.22 µ F =50mA, C OUT OUT FLY V OUT I OUT Fig. 16 Load Transient Response =2.2 µ =0.22 µ F =0mA~50mA,C OUT OUT ...
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... OUT PIN 4: C- PIN 5: VIN - PIN 6: C+ AIC1845 FLY 2.2µF 2 0.22µ AIC1845. SHDN is not allowed to float. - Flying capacitor negative terminal. Input supply voltage bypassed with a 2.2µF (min) low ESR capacitor. - Flying capacitor positive terminal. should IN 7 ...
Page 8
... Once the die temperature drops below 135°C, the charge pump switching circuit will re-start. If the fault doesn’t eliminate, the above protecting operation will repeat again and again. It allows AIC1845 to continuously work at short circuit condition without damaging the device. Shutdown In shutdown mode, the output is disconnected from input ...
Page 9
... D) OFF - AVE = × − OUT OFF - AVE = OUT For AIC1845, the controller takes the PSM (Pulse Skipping Modulation) control strategy. When the duty cycle is limited to 0.5, there will be: × × = × AVE OFF - AVE = AVE ...
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... YUDEN Power Dissipation Let’s consider the power dissipation of R and ESR. Assume that the R DS-ON switching element in AIC1845 is equal and ESR is the equivalent series resistance of C Fig. 20 and Fig. 21). The approximation of the power loss of R and ESR are given below: DS-ON ...
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... Fig. 22 The euqivalent circuit of charge pump Layout Considerations DS-ON Due to the switching frequency and high transient current of AIC1845, careful consideration of PCB is DS-ON layout is necessary. To achieve the best performance of AIC1845, minimize the distance between minimize maximum trace width. Make sure each device connects to immediate ground plane ...
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... TAIYO YUDEN Ceramic Capacitor, CELMK212BJ225MG (X5R) (0805) IN OUT TAIYO YUDEN Ceramic Capacitor, CEEMK212BJ224KG (X7R) (0805) FLY1 FLY2 Fig. 26 Parallel Two AIC1845 to Obtain the Regulated 5V Output with large output current. USB C IN 2.2µF VSHDN TAIYO YUDEN Ceramic Capacitor, CELMK212BJ225MG (X5R) (0805) ...
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... SEE VIEW WITH PLATING e1 L BASE METAL L1 SECTION A-A θ GAUGE PLANE SEATING PLANE AIC1845 SOT-26 MILLIMETERS MIN. MAX. 0.95 1.4 5 0.05 0.15 0.90 1.30 0.30 0.50 0.08 0.22 2.80 3.00 2.60 3.00 1.50 1.70 0.95 BSC 1.90 BSC 0.30 0.60 0.60 REF 0° 8° ...