ace1085g 3a low dropout linear regulator ver 1. 4 1 d escription the ace1085g is a low dropout positive adjustable or fixed - mode regulator with minimum of 3a output current capability. the product is specifically designed to provide well - regulated supply for low voltage ic applications such as high - speed bus termination and low current 3.3v logic supply. ace1085g is also well suited for other applications such as vga cards. ace1085g is guaranteed to have <1.4v dropout at full load current making it ideal to provide well - regulated outputs of 1.25 to 5.0v with 4.7 to 12v input supply by different output voltage. features 3 - terminal adjustable ofr fixed 1.5v,1.8v,2.5v,3.3v,5.0v 1.4v maximum dropout at full load current fast transient response built - in thermal shutdown output current limiting abso lute maximum ratings parameter symbol ratings unit dc supply voltage v in - 0.3 to 12 v power dissipation p d internally limited storage temperature t st - 65 ~ 150 o c operating junction temperature range t op 0 ~ 150 o c packaging type to - 252 1 2 3 adjustable version to - 252 description function 1 adj adjustable 2 vout output 3 vin input
ace1085g 3a low dropout linear regulator ver 1. 4 2 ordering information ace1085g xx xx + h block diagram halogen - free output voltage : 1.5v / 1 . 8 v / 2 .5 v
ace1085g 3a low dropout linear regulator ver 1. 4 3 electrical characteristics parameter conditions min typ max unit reference voltage ace1085g io=10ma, t j =25, (vin - vout )=1.5v 1.225 1.250 1.275 v output voltage ace1085g - 15 io=10ma, t j =25, 3v Q vin Q 12v 1.470 1.500 1.530 v ace1085g - 18 io=10ma , t j =25, 3.3v Q vin Q 12v 1.764 1.800 1.836 v ace1085g - 25 io=10ma, t j =25, 4v Q vin Q 12v 2.450 2.500 2.550 v ace1085g - 33 io=10ma, t j =25, 4.8v Q vin Q 12v 3.235 3.300 3.365 v ace1085g - 50 io=10ma, t j =25, 6.5v Q vin Q 12v 4.900 5.000 5.100 v line regulator ace 1085g xxx io=10ma, vout+1.5 ace1085g 3a low dropout linear regulator ver 1. 4 4 thermal resistance junction C to - ambient (no heat sink ;no air flow) 98 /w thermal resistance junction - to - case control circuitr y / power transistor 15 /w note 1: see thermal regulation specifications for changes in output voltage due to heating effects. line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. load regulation is measured at the output lead =1/18 from the package. note 2: line and load regulation are guaranteed up to the maximum power dissipation of 15w. power dissipation is determined b y the difference in input and output and the output current. guaranteed maxim um power dissipation will not be available over the full input/output range. functional description in troduction the ace1085g adjustable or fixed - mode low dropout (ldo) regulator is a 3 terminal device which can easily be programmed by internal mask chan ge to any voltage within the range of 1.25 to vin - 1.4v. the ace1085g only needs 1.4v differential between vin and vout to maintain output regulation, in addition, the output voltage tolerances are also extremely tight and they include the transient respons e as port of the specification. for example, intel vre specification calls for a total of 100mv including initial tolerance, load regulation and 0 to 3a load step. the ace1085g is specifically designed to meet the fast current transient needs as well as p roviding an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. load regulation since the ace1085g is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at t he load. but it can supply good load regulation by internal feedback bypass the external loss such as adjustable mode. stability the ace1085g requires the use of an output capacitor as part of the frequency compensation in order to make the regulator sta ble .for most applications a minimum of 10uf aluminum electrolytic capacitor insures both stability and good transient response. thermal design the ace1085g incorporates an internal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperatures. although this device can operate with junction temperatures in the range of 150 , it i s recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperatu re is kept below the temperature. layout consideration the output capacitors must be located as close to the vout terminal of the device as possible .it is recommended to use a section of a layer of the pc board as a plane to connect the vout pin to th e output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance.
ace1085g 3a low dropout linear regulator ver 1. 4 5 typical circuit 5v to 3.3v fixed mode regulator adjustable regulator note: v o = v ref * (1+r 2/r1) typical performance characteristic dropout voltage vs. output current load regulation vs te mperature output current (a) temperatur e ( ) percent change in output voltage vs temperature line regulation temperatur e ( ) input voltage (v)
ace1085g 3a low dropout linear regulator ver 1. 4 6 load transient response l oad transient response time (s) time (s)
ace1085g 3a low dropout linear regulator ver 1. 4 7 packing information to - 252
ace1085g 3a low dropout linear regulator ver 1. 4 8 notes ace does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sus tain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support d evice or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace - ele.com/
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