50 ics 1-1-3 dc/dc converter ics full-mold, separate excitation step-down switching mode regulator ics si-8205nhd unit v w c c c/w c/w ratings 46 1.35 ?0 to +150 ?0 to +150 40 74 symbol v in p d t j t stg j-c j-a parameter unit v mv/ c % khz mhz mv mv a ma a a v v v c v/v " /v a/v % nsec symbol v ref ? v ref / ? t fo1 fo2 ? vo line ? vo load i s i in i in(off) i en/ss v ssh v c/eh v ovp t j aea gea gcs dmax dmin ratings min. typ. max. 0.495 0.500 0.505 0.05 90 200 1 50 50 3.1 6.0 8 40 5 3.0 4.5 6.0 0.6 1.3 2.0 0.57 0.60 0.63 151 160 800 800 3.33 80 90 150 conditions v in =12v, io=1.0a v in =12v, io=1.0a, ta=?0 to +85 c v in =12v, vo=5v, io=1.0a v in =12v, vo=5v, io=1a, rfset=375k ? v in =12v, vo=5v, io=1a, rfset=75k ? v in =8 to 43v, vo to 5v, io=1a v in =12v, vo=5v, io=0.1 to 3.0a v in =12v, vo=5v v in =12v, vcomp=0v v in =12v, v en /ss=0v v en / ss =0v, v in =12v v in =12v v in =12v v in =12v v in =12v 1 b s b n f u f s conditions unit v a v c c ratings 8 or vo+3 to 43 0 u p 3.0 0.5 u p 24 ?0 to +125 ?0 to +85 4 z n c p m 7 * / * p 7 p 5 k p q 5 p q parameter absolute maximum ratings electrical characteristics features compact surface-mount (hsop8) package wide input voltage range (v in ): vo + 3 to 43 v synchronous rectifier mode output current: 3 a reference voltage and accuracy of 0.5 v 1% oscillation frequency: 200 khz to 1 mhz a ceramic capacitor can be used for output output can be disabled undervoltage lock out soft start function applications power supply for lcd module power supply for notebook pc onboard local power supplies power supply for lbp/ppc (t a = 25 c and f o = 500khz, unless otherwise specified) surface-mount, current mode control, synchronous rectifier step-down switching mode recommended operating conditions input voltage (vin pin) power dissipation junction temperature storage temperature thermal resistance (junction to lead <1 pin>) thermal resistance (junction to ambient air) when mounted on a 30 30 mm glass-epoxy board (with a 25 25 mm copper area) when mounted on a 30 30 mm glass-epoxy board (with a 25 25 mm copper area) input voltage range output current range output voltage range operating junction temperature range operating temperature range reference voltage t emperature coefficient of reference voltage efficiency oscillation frequency 1 oscillation frequency 2 line regulation load regulation overcurrent protection starting current quiescent circuit current outflow current at low voltage en/ss pin open voltage on threshold voltage ovp start voltage thermal protection start temperature error amplifier voltage gain error amplifier transformer conductance current sense amplifier impedance maximum on duty minimum on time *: the minimum value of the input voltage range is 8 v or vo + 3v, whichever is higher.
51 ics si-8205nhd (unit : mm) 4.40 1.50 0.695 typ 5.20 a enlarged view of a 1.27 0.40 0.4 0.05 0.05 0.15 0.08 0.08 pin 1 mark 6.20 2.90 2.70 c1:10 f/50v 2 y n v s b u b ( 3 . % # ) , "
c2:22 f/16v 2 y n v s b u b ( 3 . & 3 " , &
c3:270pf y n v s b u b ( 3 . u z q f
c4:10 f y n v s b u b ( 3 . u z q f
c5:1 f y n v s b u b ( 3 . u z q f
l1:10 h % 4 + 1 # - 4 b o l f o
r1:9k ? 8 i f o 7 p 7
r2:1k ? r3:51k ? r4:150k ? r5:47 ? reg drv_reg reg_uvlo vin_uvlo ocp_cmp cur_sus h/s drv level shift level shift l/s drv + m1 m2 phase_ logic gate_logic pwr_stage ? 7 * / ? # 4 ? 4 8 ' 4 & 5 ? ? ' # ? ( / % ? $ 0 . 1 control_logic tsd ovp_ cmp err_amp osc_ramp cur_comp en_ss ref reg bg ovt ph open ovp rnf ss_rnf init ovp reg reg reg reg_bias reg_drv ovc bc standby reg_bias standby ss_ref bg ref fb standby standby reg reg reg reg_dev reg_dev reg phase lsoft lsoft bs_chg reg ovt vinok regok set ph res ph init ph init cc f ere_off vinok vinok vinok regok vinok set ph f ere off ramp reg reg reg reg c1 c5 r4 c6 open c3 r3 r5 r1 r2 d1 c4 c2 l1 si-8205nhd vin bs sw fb comp gnd en/ss fset 2 4 37 8 6 5 1 gnd vin gnd v o pin assignment q ( / % w & / 4 4 e 7 * / r ' 4 & 5 t $ 0 . 1 y ' # u # 4 i 4 8 plastic mold package type flammability : ul 94v-0 product mass : approx. 0.1 g external dimensions (hsop8) block diagram t ypical connection diagram
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