to obtain the most recent version or complete data sheet, call our fax retrieval system at 1-800-446-6212 or visit our world wide web site at http://www.analog.com. 1 this information applies to a product under development. its characteristics and specifications are subject to change without notice. analog devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing. preliminary technical data a adp1073 micropower dc-dc converter adjustable and fixed 5 v, 12 v general description the adp1073 is part of a family of step-up/step-down switch- ing regulators which operates from an input supply voltage of as little as 1.0 v. this extremely low input voltage allows the adp1073 to be used in applications that require using a single cell battery as the primary power source. the adp1073 can be configured to operate in either step-up or step-down mode; but for input voltages greater than 3 v, the adp1173 is recommended. an auxiliary gain amplifier can serve as a low-battery detector or linear regulator. quiescent current on the adp1073-5 is only 135 m a unloaded, making it ideal for systems where long battery life is required. the adp1073 can deliver 40 ma at 5 v from an input voltage range as low as 1.25 v, or 10 ma at 5 v from a 1.0 v input. current limiting is available by adding an external resistor. bat- tery protection circuitry keeps reverse currents to safe levels at reverse supply voltages of up to 1.6 v. features operates at supply voltages from 1.0 v to 30 v ground current: 95 m a works in step-up or step-down mode very few external components required low-battery detector on chip user-adjustable current limit internal 1 a power switch fixed and adjustable output voltage versions 8-pin dip or so-8 package applications single-cell to 5 v converters laptop and palmtop computers pagers cameras battery backup supplies cellular telephones portable instruments 4 maC20 ma loop powered instruments hand-held inventory computers battery-powered a , b , g particle detectors functional block diagram driver i lim sw1 sw2 v in gnd set ao gain block/ error amp comparator a1 a2 fb 1.245v reference oscillator adp1073 ordering guide output package package model voltage description option* adp1073an adj pdip n-8 adp1073ar adj soic so-8 adp1073an-5 5 v pdip n-8 adp1073ar-5 5 v soic so-8 adp1073an-12 12 v pdip n-8 adp1073ar-12 12 v soic so-8 *for outline information see package information section. small outline package (so-8) ao i lim sw1 gnd v in sw2 *fixed versions 1 2 3 4 8 7 6 5 top view (not to scale) adp1073 fb (sense)* set plastic dip package (n-8) ao i lim sw1 gnd v in sw2 *fixed versions 1 2 3 4 8 7 6 5 adp1073 top view (not to scale) fb (sense)* set pin configurations rev. 0 obsolete
this information applies to a product under development. its characteristics and specifications are subject to change without notice. analog devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing. 2 preliminary technical data adp1073Cspecifications adp1073 model conditions 1 v s min typ max units quiescent current* switch off i q 95 130 m a quiescent current, step-up no load, adp1073-5 i q 135 m a mode configuration adp1073-12 250 input voltage* step-up mode v in 1.15 12.6 v 1.0 12.6 v step-down mode 30 v comparator trip point adp1073 1 202 212 222 mv voltage* output sense voltage* adp1073-5 2 v out 4.75 5.00 5.25 v adp1073-12 2 11.4 12.00 12.6 v comparator hysteresis* adp1073 5 10 mv output hysteresis* adp1073-5 125 250 mv adp1073-12 300 600 mv oscillator frequency* f osc 15 19 23 khz duty cycle* full load (v fb < v ref )dc657280% switch on time* t on 30 38 50 m s feedback pin bias current* adp1073 v fb = 0 v i fb 10 50 na set pin bias current* v set = v ref i set 60 120 na ao output low* i ao = 100 m av ao 0.15 0.4 v reference line regulation* 1.0 v v in 1.5 v 0.35 1.0 %/v 1.5 v v in 12 v 0.05 0.1 %/v switch saturation voltage* v in = 1.5 v, i sw = 400 ma v cesat 300 400 mv step-up mode 600 mv v in = 1.5 v, i sw = 500 ma 400 550 mv 750 mv v in = 5 v, i sw = 1 a 700 1000 mv 1500 mv a2 error amp gain* r l = 100 k w 3 a v 400 1000 v/v reverse battery current (note 4) i rev 750 ma current limit 220 w between i lim and v in 400 ma current limit temperature C0.3 %/ c coefficient switch off leakage current measured at sw1 pin i leak 110 m a maximum excursion below gnd i sw1 10 m a, switch off v sw2 C400 C350 mv notes *denotes the specifications that apply over the full operating temperature range. 1 this specification guarantees that both the high and low trip point of the comparator fall within the 210 mv to 230 mv range. 2 this specification guarantees that the output voltage of the fixed versions will always fall within the specified range. the waveform at the sense pin will exhibit a sawtooth shape due to the comparator hysteresis. 3 100 k w resistor connected between a 5 v source and the ao pin. 4 the adp1110 is guaranteed to withstand continuous application of +1.6 v applied to the gnd and sw2 pins while v in , i lim , and sw1 pins are grounded. specifications subject to change without notice. (@ t a = +25 8 c, v in = 1.5 v, unless otherwise noted) rev. 0 obsolete
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