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 adp1149/1149-3.3/1149-5 pin configurations 16-lead plastic dip 16-lead plastic so 14 13 12 11 10 9 16 15 1 2 3 4 7 6 5 8 top view (not to scale) pgate sd2 pdrive c t adp1149- 3.3 sense+ vfb (sd1)* sig gnd i th sense *fixed output versions = sd1 v in v cc v cc cap reg gnd pwr gnd ngate adp1149- 5 adp1149 high efficiency, synchronous step-down switching regulators features operation to 48 v input voltage ultrahigh efficiency (up to 95%) current mode operation for excellent line and load transient response high efficiency maintained over wide current range logic controlled micropower shutdown short circuit protection very low dropout operation synchronous fet switching for high efficiency adaptive nonoverlap gate drives applications notebook and palmtop computers portable instruments battery operated digital devices industrial power distribution avionics systems telecom power supplies general description the adp1149 is a family of synchronous step-down switching regulator controllers featuring automatic-sleep mode to maintain high efficiencies at low output currents. these devices drive external complementary power mosfets at switching fre- quencies up to 250 khz using a constant off-time current-mode architecture. special onboard regulation and level-shift circuitry allow opera- tion at input voltages from dropout to 48 v (60 v absolute maximum). the constant off-time architecture maintains con- stant ripple current in the inductor, easing the design of wide input range converters. current-mode operation provides excellent line and load transient response. the operating cur- rent level is user programmable via an external current sense resistor. the adp1149 incorporates automatic power saving sleep mode operation when load currents drop below the level required for continuous operation. in sleep mode, standby power is reduced to only about 8 mw at v in = 12 v. in shut- down, both mosfets are turned off. c in 100? shutdown 1 i th c t v in sense+ sense p,r-gnds ADP1149-5 p-drive c t 470pf 1k w 1000pf p-channel irfr9024 l* 62? r sense** 0.05 w 0v = normal >2v = shutdown *coiltronics ctx62-2-mp **krl sl-1-c1-0r050j s-gnd n-channel irfr024 n-drive d1 1n5819 3300pf 100v v out 5v/ 2a c out 220? p-gate cap v cc shutdown 2 0.068? 3.3? v in 1n4148 0.047? v cc figure 1. typical application rev. 0
2 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 adp1149/1149-3.3/1149-5Cspecifications parameter symbol conditions 2 min typ max units feedback voltage adp1149 only* v 10 v in = 9 v 1.21 1.25 1.29 v feedback current adp1149 only* i 10 0.2 1.0 m a regulated output voltage v out v in = 9 v adp1149-3.3* i load = 700 ma 3.23 3.33 3.43 v ADP1149-5* i load = 700 ma 4.9 5.05 5.2 v output voltage line dv out v in = 9 v to 48 v, C40 +40 mv regulation i load = 700 ma output voltage load dv out regulation adp1149-3.3* 5 ma < i load < 2 a 40 65 mv ADP1149-5.0* 5 ma < i load < 2 a 60 100 mv sleep mode output ripple* dv out i load = 0 a 50 mv p-p input dc supply current* 3 i q normal mode v in = 12 v 2 2.8 ma v in = 48 v 2.2 3.0 ma sleep mode v in = 12 v 0.6 0.9 ma v in = 48 v 0.8 1.1 ma shutdown v in = 12 v, v 15 = 2 v 135 170 m a v in = 48 v, v 15 = 2 v 300 390 m a internal regulator voltage* v cc v in = 12 v to 48 v 9.75 10.25 11 v (sets mosfet gate drive levels) i s = 20 ma v cc dropout voltage v 2 Cv 3 v in = 5 v, i 3 = 10 ma 200 250 mv p gate to source voltage (off) v in Cv 1 v in = 12 v* C0.2 0 v v in = 48 v* C0.2 0 v current sense threshold voltage v 9 Cv 8 adp1149 only v 8 = 5 v, v 10 = 1.32 v (forced) 25 mv v 8 = 5 v, v 10 = 1.1 v* (forced) 130 150 170 mv adp1149-3.3 v 8 = 3.5 v (forced) 25 mv v 8 = 2.9 v (forced)* 130 150 170 mv ADP1149-5.0 v 8 = 5.3 v (forced) 25 mv v 8 = 4.4 v (forced)* 130 150 170 mv notes *denotes specifications that apply over the full operating temperature range. 1 pin 10 is a shutdown pin on the adp1149-3.3 and ADP1149-5 fixed output voltage versions and must be at ground potential for testing. 2 t j is calculated from the ambient temperature t a and power dissipation p d according to the following formulas: adp1149ar, adp1149ar-3, adp1149ar-5: t j = t a + (p d 110 c/w) adp1149an, adp1149an-3, adp1149an-5: t j = t a + (p d 70 c/w) 3 dynamic supply current is higher due to the gate charge being delivered at the switching frequency. the allowable operating frequency may be limited by power dissipation at high input voltages. specifications subject to change without notice. (@ t a = +25 8 c, v in = 12 v, v 10 = 0 v, 1 unless otherwise noted) rev. 0 ordering guide package model output voltage description* adp1149an adj pdip adp1149ar adj so-16 adp1149an-3.3 3.3 v pdip adp1149ar-3.3 3.3 v so-16 adp1149an-5 5 v pdip adp1149ar-5 5 v so-16 *for outline information see package information section. absolute maximum ratings input supply voltage (pin 2) . . . . . . . . . . . . . . C15 v to +60 v v cc output current (pin 3) . . . . . . . . . . . . . . . . . . . . . 50 ma v cc input voltage (pin 5) . . . . . . . . . . . . . . . . . . . . . . . . . 20 v continuous output current (pins 4, 13) . . . . . . . . . . . . 50 ma sense voltages (pins 10, 15) . . . . . . . . . . . . . . . . C0.3 v to v cc shutdown voltages (pins 10, 15) . . . . . . . . . . . . . . . . . . . . . 7 v operating temperature range . . . . . . . . . . . . . . 0 c to +70 c junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . +125 c storage temperature range . . . . . . . . . . . . . C65 c to +150 c lead temperature (soldering, 10 sec) . . . . . . . . . . . . . +300 c
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