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. 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 preliminary technical data a adp1110 micropower, step-up/step-down switching regulator adjustable and fixed 5 v, 12 v features operates at supply voltages from 1.0 v to 30 v step-up or step-down mode minimal external components required low battery detector user-adjustable current limiting fixed or adjustable output voltage versions 8-pin plastic dip or so-8 package applications cellular telephones single-cell to 5 v converters laptop and palmtop computers pagers cameras battery backup supplies portable instruments laser diode drivers hand-held inventory computers functional block diagram driver i lim sw1 sw2 v in gnd set a0 gain block/ error amp comparator a1 a2 fb 1.245v reference oscillator adp1110 general description the adp1110 is part of a family of step-up/step-down switch- ing regulators that operate from an input voltage supply of as little as 1.0 v. this very low input voltage allows the adp1110 to be used in applications that use a single cell as the primary power source. the adp1110 can be configured to operate in either step-up or step-down mode, but for input voltages greater than 3 v, the adp1111 would be a more effective solution. an auxiliary gain amplifier can serve as a low battery detector as well as a linear regulator. the quiescent current of 300 m a makes the adp1110 useful in remote or battery powered applications. the 70 khz frequency operation also allows for the use of sur- face mount external capacitors and inductors. battery protection circuitry limits the effect of reverse current to safe levels at reverse voltages up to 1.6 v. ordering guide output package package model voltage description option* adp1110an adj pdip n-8 adp1110ar adj soic so-8 adp1110an-5 5 v pdip n-8 adp1110ar-5 5 v soic so-8 adp1110an-12 12 v pdip n-8 adp1110ar-12 12 v soic so-8 *for outline information see package information section. 8-lead plastic dip (n-8) a0 i lim sw1 gnd v in sw2 *fixed versions fb (sense)* set 1 2 3 4 8 7 6 5 adp1110 top view (not to scale) t jmax = 90 o , q ja = 130 o c/w pin configurations 8-lead soic (so-8) a0 i lim sw1 gnd v in sw2 fb (sense)* set 1 2 3 4 8 7 6 5 top view (not to scale) adp1110 *fixed versions t jmax = 90 o , q ja = 150 o c/w 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 adp1110Cspecifications adp1110 parameter conditions 1 v s min typ max units quiescent current* switch off i q 300 m a 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 voltage* adp1110 1 210 220 230 mv output sense voltage* adp1110-5 2 v out 4.75 5.00 5.25 v adp1110-12 2 11.4 12.00 12.6 v comparator hysteresis* adp1110 4 8 mv output hysteresis* adp1110-5 90 180 mv adp1110-12 200 400 mv oscillator frequency* f osc 52 70 90 khz duty cycle* full load (v fb < v ref )dc 62 69 78 % switch on time* t on 7.5 10 12.5 m s feedback pin bias current* adp1110 v fb = 0 v i fb 70 150 na set pin bias current* v set = v ref i set 100 300 na a0 output low* i ao = 300 m av ao 0.15 0.4 v v set = 150 mv 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 a2 error amp gain* r l = 100 k w 3 a v 1000 5000 v/v reverse battery current (note 4) i rev 750 ma current limit 220 w between i lim and 400 ma current limit temperature v in 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 saw- tooth shape due to the comparator hysteresis. 3 100 k w resistor connected between a 5 v source and the a0 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
|
