aoz1242 Alpha & Omega Semiconductor, aoz1242 Datasheet
aoz1242
Available stocks
Related parts for aoz1242
aoz1242 Summary of contents
Page 1
... General Description The AOZ1242 is a high efficiency, simple to use, 3A buck regulator flexible enough to be optimized for a variety of applications. The AOZ1242 works from a 4.5V to 32V input voltage range, and provides continuous output current on each buck regulator output. The output voltage is adjustable down to 0.8V. ...
Page 2
... GND FB 4 COMP 5 DFN-8 (Top Thru View) Pin Function IN pins need to be connected externally. IN www.aosmd.com AOZ1242 Environmental Green Product Green Product VBIAS 8 7 VIN EN 6 COMP 5 if not used. Do not leave the EN IN rises above the UVLO threshold the Page ...
Page 3
... The value of -65°C to +150°C FR-4 board with 2oz. Copper still air environment with T 25°C. The value in any given application depends on the user's spe- 2kV cific board design. in series with 100pF. www.aosmd.com AOZ1242 VIN + ISen – BST ...
Page 4
... Conditions V Rising IN V Falling 1.2V, V > 2V OUT Off Threshold On Threshold T Rising J T Falling 0V www.aosmd.com AOZ1242 Min. Typ. Max. Units 4 4 µA 0.782 0.8 0.818 V 0 200 nA 0.6 V 2.5 200 mV 315 370 425 ...
Page 5
... Full Load (CCM) Operation Vin ripple 0.1V/div Vo ripple 20mV/div IL 1A/div VLX 20V/div Short Circuit Protection Vo 2V/div lin 0.5A/div Short Circuit Recovery Vo Ripple 200mV/div lo 1A/div www.aosmd.com AOZ1242 Vin ripple 0.1V/div Vo ripple 20mV/div IL 1A/div VLX 20V/div 1μs/div Vo 2V/div lL 2A/div 200μs/div Vo 2V/div IL 2A/div 2ms/div ...
Page 6
... Efficiency Curves Efficiency 100 0.5 1.0 1.5 Current (A) 100 Rev. 1.4 November 2010 100 95 3.3V OUTPUT 90 85 1.8V OUTPUT 80 75 2.0 2.5 3.0 0 0.5 Efficiency V = 24V IN 8.0V OUTPUT 5.0V OUTPUT 3.3V OUTPUT 0 0.5 1.0 1.5 2.0 Current (A) www.aosmd.com AOZ1242 Efficiency V = 12V IN 8.0V OUTPUT 5.0V OUTPUT 3.3V OUTPUT 1.0 1.5 2.0 2.5 3.0 Current (A) 2.5 3.0 Page ...
Page 7
... The 6.8ms soft start time is set internally. Connect the EN pin enable function is not used. IN Pull it to ground will disable the AOZ1242. Do not leave it open. The voltage on EN pin must be above 2 enable the AOZ1242. When voltage on EN pin falls below 0.6V, the AOZ1242 is disabled application ...
Page 8
... When cycle by cycle current limit circuit is triggered, the output voltage drops as the duty cycle decreasing. The AOZ1242 has internal short circuit protection to pro- tect itself from catastrophic failure under output short cir- cuit conditions. The FB pin voltage is proportional to the output voltage. Whenever FB pin voltage is below 0.2V, the short circuit protection circuit is triggered ...
Page 9
... Schottky diode should be greater than the maximum input voltage, and the current rating should be greater than the maximum load current. Loop Compensation The AOZ1242 employs peak current mode control for ⎞ easy use and fast transient response. Peak current mode ⎠ ...
Page 10
... The second loop starts from inductor, to the output capacitors and load, to the GND pin of the AOZ1242, to the LX pins of the AZO1242. Current flows in the second loop when the low side diode is on. ...
Page 11
... Rev. 1.4 November 2010 Several layout tips are listed below for the best electric and thermal performance. Figure 3a and Figure 3b give ⎞ the example of layout for AOZ1242A and AOZ1242D ⎟ respectively. ⎠ not use thermal relief connection to the V the GND pin. Pour a maximized copper area to the GND pin and the V 2 ...
Page 12
... Rev. 1.4 November 2010 Figure 3a. Layout Example for AOZ1242AI Cc Rc COMP GND GND BST Vin 2 7 Vin LX VBIAS 8 1 Figure 3b. Layout Example for AOZ1242DI www.aosmd.com AOZ1242 Page ...
Page 13
... E1 e 1.27 BSC e E 5.80 6.00 6. 0.25 — 0. 0.40 — 1.27 L θ θ 0° — 8° www.aosmd.com AOZ1242 Seating Plane 0. θ Min. Nom. Max. 0.053 0.065 0.069 0.004 — 0.010 0.049 0.059 0.065 0.012 — 0.020 0.007 — 0.010 0.189 0.193 0.197 0.150 0.154 ...
Page 14
... 13.00 17.40 ø13.00 10.60 2.00 ±0.30 ±1.00 ±0.50 +0.50/-0.20 Components Tape Leader Tape Orientation in Pocket 500mm min. or 125 empty pockets www.aosmd.com AOZ1242 See Note 3 Feeding Direction 4.00 2.00 0.25 ±0.10 ±0.10 ±0. — — — Page ...
Page 15
... E 3.90 1.165 2.33 E2 2.23 e 0.95 BSC L 0.50 L1 — L2 0.285 Ref. 0.285 L3 0.835 Ref. R 0.30 Ref. aaa bbb ccc ddd eee www.aosmd.com AOZ1242 e L3 Pin #1 IDA Option 1 Chamfer 0. BOTTOM VIEW Pin #1 IDA Option 2 R BOTTOM VIEW Dimensions in inches Max. Symbols Min. Nom. 0.75 0.80 A 0.028 0.30 A3 0.008 Ref. ...
Page 16
... Leader/Trailer and Orientation Trailer Tape 300mm Min. Rev. 1.4 November 2010 1.50 1.50 12.00 1.75 5.50 Min. ±0.30 +0.10 / –0 ±0.10 ±0.10 Typ. Components Tape Orientation in Pocket www.aosmd.com AOZ1242 E1 D0 Feeding Direction 8.00 4.00 2.00 0.30 ±0.10 ±0.20 ±0.10 ±0.05 Leader Tape 500mm Min. Page ...
Page 17
... Reel M Tape Size Reel Size M ø330 12mm ø330 +0.3 -4.0 6.45±0.05 6.2 8.9±0.1 14 REF 11.90 41.5 REF 43.00 44.5±0.1 10.0 A 2.00 6.50 Rev. 1.4 November 2010 12.40 2.40 0.5 ±0.3 +2.0 -0.0 Zoom In A N=ø100±2 1.8 2.20 5.0 1.8 12 REF 6.50 VIEW: C 8.0±0.1 10.71 6° www.aosmd.com AOZ1242 6.0±1 Zoom Zoom In 3-1.8 0. 6.0 0.00 8.00 -0.05 R1 2.00 C 46.0±0.1 44.5±0.1 3.3 4.0 6.10 40° 2.5 0.80 1.80 3.00 +0.05 8.00 0.00 Page ...
Page 18
... WLT Assembly Lot Code Year & Week Code 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. www.aosmd.com AOZ1242 Page ...