BD9721FV ETC | Alldatasheet
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i1-channel Step-down PWM switching regulator controller with synchronous rectification @Description @Dimension (units : mm) The BD9721FV is a 1-chip synchronous rectification step down PWM switching regulator controller IC for a DC/DC converter. The synchronous rectification system achieves higher efficiency. It incorporates *SSOP-B16 a timer latch short protection circuit and a stand-by switch, while supporting low consumption current rae during OFF output. at ; tre @Features 1) High efficiency: more than 95%, lo=1A . 2) External output voltage control: High precisely SSOP-B16 feedback voltage : 2% 3) 3A class NchFET direct drive 4) Built-in timer latch protection circuit External capacitor needed 5) Stand-by switch Stand-by current: less than 5 7A. @Applications HDD, PC, Applications required 1.5~3.3V output from 5V power supply @Absolute Maximum Ratings (Ta=25'C) Symbol Supply vottaget (Voo“GND) | Vec_ | ts TV [Supply voltage? (PVec1 — SW) Supply votaged (PVex2—PGND) [Powerdissipation | Pa fas mi Operating temperature range Storage temperature range Output current es #1 Derating: 4.5mW/C for operation above Ta=25°C. #2 Do not exceed PD and ASO. ee
@Recommended Operating Conditions (Ta=25'C) [Parameter | Symbol [ Min. [ typ. | Max. [ Unit_| [Supply vottaget (veo“GnD) | veo | ae [| 130 | v_| [Supply votage2 (PVeoi—sw) | Pret | 3a [ = [6s | v_| [Supp votages Pvec2—PGND| Pvec2 | 38 | — | 65 | v_| [Timing capacitance | cor [75 | = | 470 ‘| pF | JOscilatortrequency [Fes [100 | = | 500 | kee | [Stand-by voltage Tew | GND | =| voc |v | [Eror ampiferinpavotage | Vow | Gno | — | 16 | v_| Note: In case of boostup of PVcct, the voltage is approximately twice as mach as PVcc2. @Electrical Characteristics (Uniess otherwise noted, Ta=25'C, Vec= 5V, PVcc=5V, f=300kHz) [Parameter Symbol | Min. | Typ_| Max [unt | __Condons | [Reference votage | Ver | 24 | 25 | 26 |v |meima Sd [Oscillator trequency | Fose_| 240 | 300 | 360 | kHz |CortS0pF [Maximum duty [Dax [ao | es [oa [% [oC [Feecbackvotage | vF i228 | 2s [vars |v |vere SSCS [Outputrserattime | tr | — | 60 | — | nS |Cate-2000pF, PvooX0.teoPveex03| a [Active votage | mw | 2g | [Stand-by votage | vms PO T= oe Pv [Stanby cure ees | - | - | s [#a | Yd @Block Diagram oe nm Vref T Veet Vref a : Tool? "¥ 1 me er eee il , ) { hole est [oc | ff Lend, m sv oe Sng es hectic ® Veer - = @ Xo eof j vv.L0
1 BD9721FV
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