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AP65353 Dataheets PDF



Part Number AP65353
Manufacturers Diodes
Logo Diodes
Description 50kHz ADAPTIVE COT STEP-DOWN CONVERTER
Datasheet AP65353 DatasheetAP65353 Datasheet (PDF)

OBSOLETE – PART DISCONTINUED PART OBSOLETE CONTACT US AP65353 3A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65353 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor. Pin Assignments ( Top View ) The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The inte.

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OBSOLETE – PART DISCONTINUED PART OBSOLETE CONTACT US AP65353 3A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER Description The AP65353 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor. Pin Assignments ( Top View ) The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SP-CAP or POSCAP and ultra-low ESR ceramic capacitors. EN 1 FB 2 Exposed Pad 8 VIN 7 BST The adaptive on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. DCM allows AP65353 to maintain high efficiency at light load conditions. The AP65353 also features programmable soft-start, UVLO, OTP, OVP and OCP to protect the circuit. VREG5 3 SS 4 9 SO-8EP 6 SW 5 PGND This IC is available in SO-8EP package. Applications • Gaming Consoles • Flat Screen TV Sets and Monitors • Set-Top Boxes • Home Audio • Consumer Electronics • Network Systems • Green Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3).compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AP65353 Document number: DS37925 Rev. 3 - 4 1 of 15 www.diodes.com March 2021 © Diodes Incorporated OBSOLETE – PART DISCONTINUED Typical Applications Circuit INPUT VIN 12V C1 20μF OFF C4 8.2nF 8 IN ON 1 EN 4 SS 7 BST 6 SW AP65353 2 FB 3 5 VREG5 GND C5 L1 0.1µF 1.5μH R1 8.25kΩ R2 C3 22.1kΩ 1µF OUTPUT VOUT 1.05V C2 44μF Figure 1 Typical Application Circuit AP65353 Pin Descriptions Pin Name Pin Number EN 1 FB 2 VREG5 3 SS 4 SW 6 BST VIN PGND 7 8 5, 9 (Exposed Pad) Function Enable input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low to turn off. EN can be safely connected to VIN directly for automatic startup. Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider connected to it from the output voltage. Internal power supply output pin to connect an additional capacitor. Connect a 1μF (typical) capacitor as close as possible to the VREG5 and PGND. This pin is not active when EN is low. Soft-start control input pin. SS controls the soft start period. Connect a capacitor from SS to PGND to set the soft-start period. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BST to power the high-side switch. Bootstrap pin. A bootstrap capacitor is connected between the BST pin and SW pin. The voltage across the bootstrap capacitor drives the internal high-side NMOS switch. A 0.1μF (typical) capacitor is required for proper operation. Supply input. A capacitor should be connected between the VIN pin and PGND pin to keep the DC input voltage constant. Power ground and GND. Exposed pad must be connected to as large of PGND plane as possible for maximum thermal performance. AP65353 Document number: DS37925 Rev. 3 - 4 2 of 15 www.diodes.com March 2021 © Diodes Incorporated OBSOLETE – PART DISCONTINUED Functional Block Diagram AP65353 EN 1 Logic UVLO Control SS 4 Soft Start SS Se + 0.6V Internal Reference 2 FB + - SS + Min Off Time S Q R Q 5V Vcc Regulator 8 VIN 3 VREG5 OCP SW Ref 5V 7 BST SW On Time Compute Digital Control Logic One Shot SS 6 SW VIN Frequency Lock Loop 5, 9 PGND Figure 2 Functional Block Diagram AP65353 Document number: DS37925 Rev. 3 - 4 3 of 15 www.diodes.com March 2021 © Diodes Incorporated OBSOLETE – PART DISCONTINUED AP65353 Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.) Symbol Parameter VIN Supply Voltage VREG5 VREG5 Pin Voltage VSW Switch Node Voltage VBST Bootstrap Voltage VFB Feedback Voltage VEN Enable/UVLO Voltage VSS Soft-start PIN VPGND PGND Pin Voltage TST Storage Temperature TJ Junction Temperature TL Lead Temperature ESD Susceptibility (Note 5) HBM Human Body Model MM Machine Model Rating -0.3 to 20 -0.3V to +6.0 -1.0 to VIN +0.3 -0.3 to VSW +6.0 -0.3V to +6.0 -0.3V to VIN -0.3V to +6.0 -0.3 to 0.3 -65 to +150 +160 +260 2 200 Unit V V V V V V V V °C °C °C kV V Notes: 4. Stresses greater than the 'Absolute Maximum Ratings' specifie.


PF2270 AP65353 C6011


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