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| 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 ) Parameter Power MOS supply voltage Control circuit supply voltage Pre driver supply voltage Output current from DSW terminal Power dissipation Operating temperature range Storage temperature range Symbol PowVcc PrePcc VG(9pin) Iswomax Pd Topr Tstg Limits 9 9 12 1 560 *2 *1 Unit V V V A mW C C - 30 ~ + 85 - 55 ~ +150 *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) Parameter Power MOS supply voltage Control circuit supply voltage Pre-driver supply voltage Ambient temperature Variable DC/DC converter output voltage Reset threshold voltage range 1 Reset threshold voltage range 2 *5 *6 *3 *4 Symbol PowVcc PreVcc VG(9pin) Io(Variable DC/DC) Ta VDD Vthrst 1 Vthrst 2 Min. 4.5 4.5 8.0 -- -10 1.7 3.5 1.25 Typ. 5.0 5.0 10.0 300 25 -- -- -- Max. 5.5 5.5 11.5 500 70 Vcc-1 Vcc Vcc Unit V V V mA C V V V Variable DC/DC converter output current * 3 In case supply voltage provided outside without using charge-pump built-in. * 4 L=47 H, C=47F 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 Quiescent current EI terminal threshold voltage EO terminal output voltage H EO terminal output voltage L Symbol IST ICC VEITH VEOH VEOL Min. -- -- 1.20 1.48 -- -- -- 7.7 1.20 Typ. 170 1.45 1.25 1.68 0.01 0.42 0.30 9.7 1.25 Max. 290 2.60 1.30 1.88 0.15 0.87 0.60 11.7 1.30 Unit A mA V V V V V (5C Ta 75C : design guaranteed) IEO=-100 A IEO=100A IL=500mA IL=-500mA Operating CE=0V Conditions DSW terminal ON resistance H RDSWONH DSW terminal ON resistance L RDSWONL Charge-pump output voltage Reset detection threshold voltage VG VDETON Application circuit |
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