ap1605 pwm/pfm dual-mode step-d own switching regulator this datasheet contains new product information. anachip corp. re serves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev. 0.1 mar 31, 2004 1/6 ? features - low current consumption: in operation: 100a max. power off: 2a max. - input voltage: 2.5v to 8v. adjustable version (+ 2.5%) - pwm/pfm dual mode - oscillation frequency: 270khz typ. - soft-start time set-up externally type possible - with a power-off function. - built-in internal sw p-channel mos - sop-8l/tssop-8l package. ? applications - on-board power supplies of battery devices for portable telephones, electronic notebooks, pda, and other hand-held sets. - power supplies for audio equipment, including portable cd players and headphone stereo equipment. - fixed voltage power supply for cameras, video equipment and communications equipment. - power supplies for microcomputers. - conversion from four ni-h or ni-cd cells or two lithium-ion cells to 3.3v/3v. - conversion of ac adapter input to 5v/3v. ? general description ap1605 consists of cmos step-down switching regulator with pwm/pfm dual mode control. these devices include a reference voltage source, oscillation circuit, error amplifier, internal pmos and etc. ap1605 provides low-ripple power, high efficiency, and excellent transient characteristics. the pwm/pfm control circuit is able to very the duty ratio linearly 0%~0.25% (pfm) and 25%~100% (pwm). this converter also contains an error amplifier circuit as well as a soft-start circuit that prevent s overshoot at startup. with the addition of an internal p-channel power mos, a coil, capacitors, and a diode connected externally, these ics can function as step-down switching regulators. they serve as ideal power supply units for portable devices when coupled with the sop?8l mini-package, providing such outstanding features as low current consumption. since this converter can accommodate an input voltage of up to 7.5v, it is also ideal when operating via an ac adapter. ? pin assignments 1 2 3 4 8 7 6 5 fb sw vcc ap1605 sw vss vss pvcc ce sop-8l 1 3 2 4 8 6 7 5 vss ce ce fb sw pvcc pvcc vcc ap1605 tssop-8l ? pin descriptions pin no. pin sop tssop description fb 1 4 feedback pin ce 2 2 3 chip enable h: enable l: disable vcc 3 5 ic signal power supply pin, add a 10 ? resistor to pvcc and a 0.1f capacitor to gnd. pvcc 4 6 7 ic power supply pin sw 5 6 8 switch pin. connect external inductor/diode here. minimize trace area at this pin to reduce emi. vss 7 8 1 gnd pin
ap1605 pwm/pfm dual-mode step-d own switching regulator anachip corp. www.anachip.com.tw rev. 0.1 mar 31, 2004 2/6 ? ordering information ap 1605 x x x package packing s: sop-8l blank : tube a : taping lead free blank : normal l : lead free package ts: tssop-8l ? block diagram oscillation circuit reference voltage source with soft start pwm /pfm -switched control circuit + - ap1605 v ss fb pv cc sw v cc ce ? absolute maxi mum ratings symbol parameter rating unit v cc *1 v cc pin voltage v ss - 0.3 to v ss + 8 v pv cc pv cc pin voltage v ss - 0.3 to v ss + 8 v fb fb pin voltage v ss - 0.3 to v ss + 8 v v ce on/off pin voltage v ss - 0.3 to v ss + 8 v v sw switch pin voltage v ss - 0.3 to v in + 0.3 v sop-8l 1200 p d power dissipation tssop-8l 700 mw t opr operating temperature range -20 to +85 o c t stg storage temperature range -20 to +125 o c caution: the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions.
ap1605 pwm/pfm dual-mode step-d own switching regulator anachip corp. www.anachip.com.tw rev. 0.1 mar 31, 2004 3/6 ? electrical characteristics (v in = 5v, t a =25 c , unless otherwise specified) symbol parameter conditions min. typ. max. unit v in input voltage ap1605 series 2.5 -- 7.5 v v ref internal reference voltage 1.17 1.2 1.23 v v uvlo uvlo voltage voltage required to maintain v out -- -- 2.2 v maxdty maximum duty ratio 100 -- -- % pfmdty pfm duty ratio 15 25 35 % sop-8l 3 -- -- i sw switch current duty = 50% tssop-8l 1.5 -- -- a i ss current consumption power on v out =2.5v -- 35 100 a i sss current consumption during power off v on/off =0v -- -- 2 a ? v out1 line regulation 2.5v~7.5v @ i out =0.1a -- 0.2 0.5 % ? v out2 load regulation 0.1a~3a(sop-8l), 0.1a~1.5a(tssop-8l) -- 1 1.5 % f osc oscillation frequency 230 270 310 khz v ceh ce pin ?high? voltage evaluate oscillation at sw pin 0.65 -- -- v cel ce pin ?low? voltage evaluate oscillation stop at sw pin -- -- 0.2 v i sh -- -0.1 -- 0.1 a i sl power-off pin input leakage current -- -0.1 -- 0.1 a t ss soft-start time -- 5 15 -- ms effi efficiency v in = 5v, v out = 2.5v iout = 1a -- 93 -- % ? typical application circuit 1 normal application + - c c r a r b d1 out v ss fb pv cc sw v cc r vcc c vcc ce ap1605 ) r r (1 vref vo b a + = =~200k
ap1605 pwm/pfm dual-mode step-d own switching regulator anachip corp. www.anachip.com.tw rev. 0.1 mar 31, 2004 4/6 ? typical application circuit (continued) 2 application with short circuit protection ap 1605 + - v ss ce c c r a r b d1 v out : 1.8v fb pv cc sw v cc d vcc 1n 4148 for above 5v vin and schottky for below 5v vin c vcc 0.1uf c pvcc 100 uf c on /off 0.2uf r on /off 3.5m r bias 10 m r sence 1m c output 100 uf v in : 2.5v~7.5v ) r r (1 vref vo b a + = =~10k ? test circuit a fb vcc vss open open fb vcc vss + - oscillation sw sw pvcc pvcc a fb vcc vss + - + - v sw pvcc ce ce ce ? function description pwm/pfm control (ap1605 series) the ap1605 consists of dc/dc converters that employ a pwm/pfm auto-switch system. in converters of the ap1605, the pfm mode varies in a range of duty cycle from 0% to 25%, and the pwm mode varies in a range of duty cycle from 25% to 100% according to the load current, and yet ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. therefore, these converters provide a low-ri pple power over broad ranges of input voltage and load current.
ap1605 pwm/pfm dual-mode step-d own switching regulator anachip corp. www.anachip.com.tw rev. 0.1 mar 31, 2004 5/6 ? marking information sop-8l/tssop-8l ( top view ) logo part no. id code: internal year: "01" =2001 "02" =2002 xth week: 01~52 ~ 1 4 8 5 ac ap1605 yy ww x x blank : normal l : lead free package ? package information package type: sop-8l view "a" l c view "a" h e a a2 a1 b e d 7 (4x) 0.015x45 7 (4x) y dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.40 1.60 1.75 0.055 0.063 0.069 a1 0.10 ? ? ? 1.27 ? ? ? h 5.79 5.99 6.20 0.228 0.236 0.244 l 0.38 0.71 1.27 0.015 0.028 0.050 y ? ? 0.10 ? ? 0.004 0 o ? ?
ap1605 pwm/pfm dual-mode step-d own switching regulator anachip corp. www.anachip.com.tw rev. 0.1 mar 31, 2004 6/6 ? package information (continued) package type: tssop-8l a e e1 b y e c detail a detail a l 1 l e1 l1 a2 a1 d pin 1 indicator 0.70 mm surface polished dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.05 1.10 1.20 0.041 0.043 0.047 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 - 1.00 1.05 - 0.039 0.041 b 0.20 0.25 0.28 0.008 0.01 0.011 c - 0.13 - - 0.005 - d 2.90 3.05 3.10 0.114 0.12 0.122 e 6.20 6.40 6.60 0.244 0.252 0.26 e1 4.30 4.40 4.50 0.169 0.173 0.177 e - 0.65 - - 0.026 - l 0.50 0.60 0.70 0.02 0.024 0.028 l1 0.90 1.00 1.10 0.035 0.039 0.043 y - - 0.10 - - 0.004 0 o 4 o 8 o 0 o 4 o 8 o
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