15 small-package pwm/pfm control step-up switching regulator s-8324/8328 series features consisting of a reference voltage source, an oscillation cir- cuit, a power mosfet and an error amplifier, this series of devices offer high efficiency over a wide range because the control circuit has the ability to change the control scheme according to the load. a step-up switching regulator can be constructed by exter- nally connecting only a coil, a capacitor and a diode to the s-8324 series. these features, along with its small package and low current consumption, make the s-8324 series ideal as a power supply for portable equipment needed high ef- ficiency. for applications requiring a high output current, the s-8328 series is also available with an external transis- tor. for making an external coil smaller, high frequency type (250khz) is also available. ? low voltage operation : 0.9v (iout=1ma) : 1.4v (h,j series) ? low current consumption operation : 17.2 m a typ. (vout=3v 50khz) : 59.4 m a typ.(s-8328h33) shutdown : 0.5 m a max. ? low input current : 10.4 m a typ. (vout=3v 50khz, no load) ? duty ratio : auto-switching pfm/pwm control circuit during pwm control : 15 to 83% typ. (15 to 73% : h,j series) during pfm control : 15% typ. ? external components : coil, diode, capacitors ? output voltage : accurate to 2.4% ? oscillation frequency : 30khz, 50khz, 100khz, 250khz, ? built-in soft start function ? shutdown function ? large output currents can be obtained with an external transistor (s-8328 series) ? small package : sot-23-5, sot-23-3, sot-89-3 ? step-down and inverting type can be also made. applications ? power supplies for portable equipment such as pagers, handy calculators, and remote controllers ? constant voltage power supplies for cameras, video equipment, and communications equipment ? power supply for microcomputers pin configurations selection guide top view 54 13 2 sot-23-5 1 3 2 top view sot-23-3 top view sot-89-3 13 2 s-8324axxmc/s-8328bxxmc/s-8324hxxmc/s-8328hxxmc sot-23-5 s-8324axxma/s-8324axxua/s-8324cxxma s-8328bxxma/s-8328bxxua sot-23-3, sot-89-3 s-8324dxxmc/s-8328exxmc/s-8324jxxmc/8328jxxmc sot-23-5 shutdown pin "h" : nomal operation (stepping up operation) "l" : stop stepping up (whole circuit stop) 1 5 v out cont ext on / off pin no. pin name functions output voltage pin and power supply pin n. c. (non connection) gnd pin external inductor connection pin (for s-8324 series) external transistor connection pin (for s-8328 series) 4 3 2 v ss - external inductor connection pin (for s-8324 series) output voltage pin power supply pin n. c. (non connection) gnd pin v out v dd - v ss 1 2 3 4 cont ext 5 pin no. pin name functions external transistor connection pin (for s-8328 series) gnd pin v ss v out cont ext 1 2 3 pin no. pin name functions output voltage pin and power supply pin external inductor connection pin (for s-8324 series) external transistor connection pin (for s-8328 series) s-8324axxmc s-8324axxma s-8324axxua with a shutdown function without shutdown function without shutdown function s-8324dxxmc for variable output voltage by step-up dc/dc converter and step-down, inverted output dc/dc converter with an external resister for variable output voltage by step-up dc/dc converter and step-down, inverted output dc/dc converter with an external resister s-8324cxxma s-8328bxxmc s-8328bxxma s-8328bxxua s-8328exxmc s-8324hxxmc s-8324jxxmc s-8328hxxmc s-8328jxxmc - - - - - - - - - - - - - 50 50 50 50 30 100 100 100 100 250 250 250 250 - - - - - - - - - - - - - - - - - - sot-23-5 sot-23-3 sot-89-3 sot-23-5 sot-23-3 sot-23-5 sot-23-3 sot-89-3 sot-23-5 sot-23-5 sot-23-5 sot-23-5 sot-23-5 product name built in power transistor with external power transistor switching frequency(khz) shutdown function v dd /v out separate type package application for pagers for large load current with shutdown function for large load current without shutdown function for large load current without shutdown function for variable output voltage by step-up dc/dc converter with an external resister for making external parts smaller with a shutdown function for large load current without shutdown function for variable output voltage by step-up dc/dc converter with an external resister
15 16 power supply product list item output voltage (v) 2.0 2.5 2.7 2.8 3.0 3.3 5.0 - s-8324a25mc-eof-t2 s-8324a27mc-eoh-t2 s-8324a28mc-eoi-t2 s-8324a30mc-eok-t2 s-8324a33mc-eon-t2 s-8324a50mc-epe-t2 - S-8324A25MA-EOF-T2 s-8324a27ma-eoh-t2 - s-8324a30ma-eok-t2 s-8324a33ma-eon-t2 s-8324a50ma-epe-t2 - s-8324a25ua-eof-t2 s-8324a27ua-eoh-t2 - s-8324a30ua-eok-t2 s-8324a33ua-eon-t2 s-8324a50ua-epe-t2 - s-8324c25ma-eqf-t2 s-8324c27ma-eqh-t2 - s-8324c30ma-eqk-t2 - - s-8324d20mc-e2a-t2 - - - s-8324d30mc-e2k-t2 - s-8324d50mc-e4e-t2 - - - - - - - s-8324j20mc-fua-t2 - - - - - s-8324j50mc-fve-t2 s-8324axxmc series s-8324axxma series s-8324axxua series s-8324cxxma series s-8324dxxmc series s-8324hxxmc series s-8324jxxmc series 2.0 2.5 2.7 3.0 3.3 3.6 3.8 5.0 5.2 - s-8328b25mc-ewf-t2 s-8328b27mc-ewh-t2 s-8328b30mc-ewk-t2 s-8328b33mc-ewn-t2 s-8328b36mc-ewq-t2 s-8328b38mc-ews-t2 s-8328b50mc-exe-t2 s-8328b52mc-exg-t2 - s-8328b25ma-ewf-t2 s-8328b27ma-ewh-t2 s-8328b30ma-ewk-t2 s-8328b33ma-ewn-t2 - - s-8328b50ma-exe-t2 - - s-8328b25ua-ewf-t2 s-8328b27ua-ewh-t2 s-8328b30ua-ewk-t2 s-8328b33ua-ewn-t2 - - s-8328b50ua-exe-t2 - s-8328e20mc-eya-t2 - - - - - - s-8328e50mc-e9e-t2 - item output voltage (v) s-8328bxxmc series s-8328bxxma series s-8328bxxua series s-8328exxmc series - - - - - - - - - s-8328hxxmc series - - - - - - - s-8328j50mc-f3e-t2 - s-8328jxxmc series block diagram v out v ss pwm/pfm control circuit vref + - c in v in l sd cont on/off + - soft start circuit + - c out please ask an sii representative if you need another output voltage product. (1) s-8324axxmc, s-8324hxxmc (3) s-8324axxma, s-8324axxua, s-8324cxxma (2) s-8328bxxmc, s-8328hxxmc (4) s-8328bxxma, s-8328bxxua (6) s-8328exxmc, s-8328jxxmc (output voltage adjustment circuit with external resistors) (5) s-8324dxxmc, s-8324jxxmc (output voltage adjustment circuit with external resistors) v out v ss vref + - c in v in l sd ext on/off + - + - c out 2200pf 1k w pwm/pfm control circuit soft start circuit v out v ss vref + - c in v in l sd cont + - + - c out pwm/pfm control circuit soft start circuit v out v out v ss vref + - c in v in l sd ext + - + - c out 2200pf 1k w pwm/pfm control circuit soft start circuit v dd v cc v out r 1 r 2 v ss vref + - c in v in l sd cont r a r b + - + - c out c c pwm/pfm control circuit soft start circuit v dd v cc v out r 1 r 2 v ss vref sd r a r b + - + - c out c c + - c in v in l ext 2200pf 1k w pwm/pfm control circuit soft start circuit
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