UTC UZ1086
LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
1
QW-R102-008,D
1.5A ADJUSTABLE/FIXED LOW DROPOUT LINEAR REGULATOR
DESCRIPTION
The UTC UZ1086 and UZ1086-1.8V,2.5V, 2.85V, 3.3V and 5V are low dropout three-terminal regulators with 1.5A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus.
Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures.
Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the UZ1086 flows into the load,increasing efficiency.
FEATURES
*Low dropout voltage
*Load regulation: 0.05% typical *Trimmed current limit *On-chip thermal limiting
*Three-terminal adjustable or fixed 1.8V, 2.5V, 2.85V, 3.3V, 5V
APPLICATIONS
*Active SCSI terminators
*High efficiency linear regulators
*Post regulators for switching supplies *Battery charges
*5V to 3.3V linear regulators *Motherboard clock supplies
1: ADJ/GND 2: V OUT 3: V IN
UTC UZ1086
LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
2
QW-R102-008,D
TYPICAL APPLICATIONS
V IN V IN
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise specified)
PARAMETER MIN MAX UNIT
V IN 7.5 V
Operating Junction Temperature Range 0 125 °C Storage Temperature Range -65 150 °C Lead Temperature (Soldering,10 sec) 300 °C
ELECTRICAL CHARACTERISTICS (V IN ≤7V, T J =25°C, unless otherwise specified.
The*denotes specifications which apply over the specified operating temperature range.)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Reference Voltage (note 3)
V REF *
1.5V ≤(V IN – V OUT ) ≤5.75V 10mA ≤I OUT ≤1A
1.225 1.25 1.275 V
Output Voltage
* * * * 10mA ≤I OUT ≤1A UZ1086-1.8V 3.3V ≤V IN ≤7V UZ1086-2.5 4V ≤V IN ≤7V UZ1086-2.85 4.35V ≤V IN ≤7V UZ1086-3.3 4.8V ≤V IN ≤7V UZ1086-5.0 6.5V ≤V IN ≤7V 1.764 2.450 2.793 3.234 4.900 1.80 2.50 2.85 3.30 5.00 1.836 2.550 2.907 3.366 5.100
V V V V
Line Regulation (note1,2)
* (V OUT+1.5V)≤V IN ≤7V, I OUT 10mA 0.005 0.2 % Load Regulation (note1,2)
* V IN – V OUT =2V, 10mA ≤I OUT ≤1A 0.05 0.5 %
Dropout Voltage *
?V REF =1%,I OUT =
1.5A 1.3 1.5 V
Current Limit
*
V IN – V OUT =2V 1.6 2 A
Adjust Pin Current (note 3)
IAdj *
35 120 μA
Adjust Pin Current Change (note3)
* 1.5V ≤(V IN – V OUT ) ≤5.75V, 10mA ≤I OUT ≤1A
0.2 5 μA
Minimum Load Current * 1.5V ≤(V IN – V OUT ) ≤5.75V 10 mA Quiescent Current
* V IN =V OUT+1.25V 4 13 mA
UTC UZ1086
LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
3
QW-R102-008,D
PARAMETER SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Ripple Rejection
f=120Hz,C OUT =22μF, Tantalum
V IN – V OUT =3V, I OUT =1.5A
60 72 dB Thermal Regulation
T A =25°C,30ms pulse 0.004 0.02 %/W Temperature Stability * 0.5 % Long-Term Stability T A =125°C, 1000hrs 0.03 1 % RMS Output Noise V OUT T A =25°C, 10Hz ≤f ≤10kHz 0.003 % Thermal Resistance
Junction to Case (note 4) SOT-223 TO-252,TO-263,TO-220 15 3
°C/W
Thermal Shutdown Junction Temperature 155 °C Thermal Shutdown Hysteresis 10 °C
Note:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line
regulation are measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined
by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/output voltage range. 3. UZ1086 adjustable only.
4. With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane,
Thermal Resistance Junction to Ambient can vary from 30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W.
UTC UZ1086 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
4
QW-R102-008,D
TYPICAL PERFORMANCE CHARACTERISTICS
0.3
0.60.9 1.200.50.60.70.80.9Figure 1.Dropout Voltage vs.Output Current D r o p o u t V o l t a g e (V )
Output Current (A)
1.5
1.01.11.21.31.4
1.5
Figure 2. Load Regulation vs.Temperature D r o p o u t V o l t a g e D e v i a t i o n (%)
Junction Temperature(°C )00.05--75-252575125-501.220
1.22550Figure 3.Reference Votage vs.Temperature R e f e r e n c e V o l t a g e (V )
Junction Temperature(°C )
175
1.231001.2351501.251.211.2
1.205
1.2151.2451.24
Figure 4.Output Voltage vs.Temperature R e f e r e n c e V o l t a g e (V )
Junction Temperature(°C )
3.2
UTC UZ1086
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO. LTD
5
QW-R102-008,D
S h o r t - C i r c u i t C u r r e n t (A )
Junction Temperature(°C )1.75
2
Figure 5.Minimum Load Current vs.Temperature
M i n i m u m L o a d C u r r e n t (m A )
35
1
4
Figure 6.Adjust Pin Current vs.Temperature Frequency (Hz)