99W134A DC/DC Converter+Reset BH6557FV Description The BH6557FV is a variable output DC/DC converter IC with reset. The DC/DC converter output voltage value and reset voltage value can be adjusted by external resistance. Dimension (Units : mm) Features 1) Synchronous rectification enables high efficiency 2) Built-in charge pump circuits for operating output power MOS 3) Built-in variable reset circuit 4) Built-in power MOS Tr requires fewer external components 5) Mute circuit built-in 6) Built-in thermal shut down circuit 7) SSOP-B16 package has a smaller board footprint SSOP-B16 Applications CD-ROM Absolute Maximum Ratings (Ta=25 ˚C ) Symbol Limits Unit Power MOS supply voltage Parameter PowVcc 9 V Control circuit supply voltage PrePcc 9 Pre driver supply voltage VG(9pin) 12 V V Output current from DSW terminal Power dissipation Iswomax 1 *2 A Pd 560 *1 mW Operating temperature range Topr – 30 ~ + 85 ˚C Storage temperature range Tstg – 55 ~ +150 ˚C * 1 Derating : 4.5mV/˚C for operation above Ta=25 ˚C. On less than 3% (percentage occupied by copper foil), 70mm ¥ 70mm, t=1.6mm, glass epoxy mounting. * 2 Intermittent current at maximum applied time of 5msec, 1/10 duty (Max.) January, 2000 Recommended Operating Conditions (Ta=25 ˚C) Symbol Min. Typ. Max. Power MOS supply voltage PowVcc 4.5 5.0 5.5 V Control circuit supply voltage PreVcc 4.5 5.0 5.5 V VG(9pin) Io(Variable DC/DC) 8.0 10.0 11.5 V — 300 500 mA –10 25 70 ˚C V Parameter Pre-driver supply voltage *3 Variable DC/DC converter output current *4 Ambient temperature Ta Variable DC/DC converter output voltage Reset threshold voltage range 1 *5 Reset threshold voltage range 2 *6 Unit VDD 1.7 — Vcc-1 Vthrst 1 3.5 — Vcc V Vthrst 2 1.25 — Vcc V * 3 In case supply voltage provided outside without using charge-pump built-in. * 4 L=47µ H, C=47µF is used. * 5 Setting voltage range when 12pin(PreVcc) is monitored. * 6 Setting voltage range when the desired voltage except 12pin(PreVcc) is monitored. Electrical characteristics (Unless otherwise noted, Ta=25 ˚C, PREVCC=5V) Parameter Current in standby mode Symbol Min. Typ. Max. Unit IST — 170 290 µA Conditions CE=0V ICC — 1.45 2.60 mA EI terminal threshold voltage VEITH 1.20 1.25 1.30 V (5˚C≤ Ta ≤ 75˚C : design guaranteed) EO terminal output voltage H VEOH 1.48 1.68 1.88 V IEO=–100µ A EO terminal output voltage L VEOL — 0.01 0.15 V IEO=100µA — 0.42 0.87 Ω IL=500mA — 0.30 0.60 Ω IL=–500mA VG 7.7 9.7 11.7 V Operating VDETON 1.20 1.25 1.30 V Quiescent current DSW terminal ON resistance H RDSWONH DSW terminal ON resistance L RDSWONL Charge-pump output voltage Reset detection threshold voltage Application circuit