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UTC1117
LINEAR INTEGRATED CIRCUIT
1A LOW DROPOUT POSITIVE VOLTAGE REGULATOR
DESCRIPTION
The UTC1117 is a 1A low-dropout positive voltage regulator. It is available in fixed and adjustable output voltage versions. Over-current and thermal protection are integrated onto the chip. Output current will decrease while it reaches the pre-set current or temperature limit. The dropout voltage is specified at 1.2V Maximum at full rated output current. UTC1117 Series provides excellent regulation over line, load and temperature variations.
TO-252
FEATURES
* Low dropout voltage ..............1.2V at 1A * Adjustable or fixed voltages * Typical line regulation ....... 0.2% * Typical load regulation ...... 0.15% * Adjust pin current less than 90mA * Over-current protection * Thermal protection
APPLICATIONS
* High Efficiency Linear Regulators * 5V to 3.3V Voltage Converter * Battery Charger * Post Regulators for Switching supplies
BLOCK DIAGRAM
Input
Current Limiting Amplifier Thermal Protection Output
Error Amp.
Bandgap Reference
ADJ/COM
PIN CONFIGURATION
TO-252 Top View SOT-223 Top View
123 1: GND/ADJ 2: VOUT 3: VIN
123
1: GND/ADJ 2: VOUT 3: VIN
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UTC1117
ABSOLUTE MAXIMUM RATINGS
Characteristic
Input Voltage Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) SOT-223 TO-252 SOT-223 TO-252
LINEAR INTEGRATED CIRCUIT
Symbol
VIN
Value
15 27* 15 63* 156 0 ~ 125 -65 ~ 150 260
Unit
V
Operating Junction Temperature Range Storage Temperature Range Lead Temperature ( 10 sec )
TSTG TLEAD
* Surface Mounted on 4 layers board based on JEDIC standard JC15.1
ELECTRICAL CHARACTERISTICS
UTC1117ACCT (Adjustable Version) Characteristic
Reference voltage
Symbol
VREF VIN=5V, IO=10mA
Test Condition
TJ=25C Over Temp. TJ=25C TJ=25C VIN=4.75~15V,IO=10mA Over Temp. TJ=25C
VIN=4.75~7V,IO=10mA Line regulation * RegLINE
Load regulation Dropout voltage Current limit Temperature coefficient
RegLOAD VIN=5V,IO=10mA~1A Over Temp. VD IS TC IO=10mA~1A,Vo=1% VIN=2.75~7V VIN=2.75~7V,IO=10mA~1A TJ=25C Over Temp. Over Temp. 1.0
Adjust pin current Adjust pin current change Temperature stability Minimum load current RMS output noise Ripple rejection ratio
IADJ
VIN=2.75~7V, IO=10mA~1A Over Temp. VIN=2.75~7V, IO=10mA~1A, Over Temp.
IADJ
TS IO VN RA
VIN=2.75~7V, IO=10mA~1A, Over Temp. VIN=5V TJ=25C VIN=5V, IO=1A, Over Temp. 60
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JC
C/W
JA
TJ
C
Min
1.238 1.225
Typ.
1.250 1.250
Max
1.262 1.275 0.2 0.3 0.4
Unit
V
%
0.05 0.2 1.0
0.3 0.4 1.2 V A
0.005 55 90 0.2 0.5 5 0.003 72 10 5
%/C
A
% mA %Vo dB
2
UTC1117
UTC1117lCCCT (Fixed 3.3V Output Version) Characteristic
Output voltage
LINEAR INTEGRATED CIRCUIT
Symbol
Vo
Test Condition
VIN=5V,IO=0A VIN=4.75~7V,IO=0A TJ=25C Over Temp. TJ=25C TJ=25C Over Temp. TJ=25C Over Temp.
Min
3.270 3.234
Typ.
3.3 3.3
Max
3.330 3.330 0.2 0.3 0.4
Unit
V
Line regulation *
RegLINE
VIN=4.75~15V,IO=0A
%
Load regulation Dropout voltage Current limit Quiescent Current Temperature coefficient Temperature stability RMS output noise Ripple rejection ratio
RegLOAD VIN=5V,IO=0A~1A VD IS lQ TC TS VN RA
0.05 0.2 1.0 1.0 6 0.005 0.5 0.003 60 72
0.3 0.4 1.2 13 V A mA %/C % %Vo dB
IO=0A~1A,Vo=1%, Over Temp. VIN=4.75~7V,Over Temp., Over Temp. VIN=5V,IO=0A~1A, Over Temp. VIN=4.75~7V,IO=0A~1A VIN=5V, IO=100mA~1A, Over Temp. TJ=25C VIN=5V, IO=1A, Over Temp.
* Line regulation test circuit
VIN
3 IN
ADJ 1
OUT 2 100
VOUT
10 Tan
164
10 Tan
TYPICAL APPLICATION
UTC1117
4.75V to 15V
10F Tan
10F Tan
Load
Input range depends on Vo. Please refer to electrical characteristics
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UTC1117
1.Load regulation
Output Voltage deviation( ) 0.00 -0.05 -0.10 -0.15 -0.20 -0.25 -50 -30 -10 10 30 50 ) 70 90
LINEAR INTEGRATED CIRCUIT
2.Short circuit current
1.6 Shot Circuit Current ( A ) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 1.2 1.3 1.5 1.7 2 5 10 15
PERFORMANCE CHARACTERISTICS
3.Temperature stability
Reference Voltage ( V ) 1.252 1.250 1.248 1.246 1.244 1.242 1.240 1.238 -50 -25
Minmum Input/Output Differential ( V )
5.Adjust pin current
Adjust Pin Current (A ) 45 40 35 30 25 20 15 10 5 0 -50 -25 0 25 50 75 100 125 )
Minimum Operating Current ( mA)
7.Load transient response
Output 0.1 Voltage 0 Deviation ( V ) -0.1 2 Load Current (A) 1 0 0.0 Cin=10UF Vo
Cout=10UF Cout=1UF Cout=0UF Io Vin=5V Vo=3.3V Preload=100mA
25 Time ( vS)
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Temperature (
0 25 50 Temperature (
Tenperature (
Input/Output Differential ( V )
4.Dropout voltage
1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.1 0.3 0.5 0.7 0.9 1 Output Current ( A )
75 100 125 )
6.Minimum operating current
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 0 0.1 1 1.1 1.2 2 3 5 10 15 20 25 30 35
Input/Output Differential ( V )
8.Line transient response
Line Transient Response 30mV 0 -30mV Cin=Co=IUF Io=0.1A Vo=3.3V 6V 5V
50
Vo=Deviation
Vin
Time (S )
4
UTC1117
ORDERING INFORMATION
PART NUMBER
UTC1117ACGT UTC1117CCGT UTC1117ACCT
LINEAR INTEGRATED CIRCUIT
OUTPUT VOLTAGE
1.30 to 12.0 3.3 1.30 to 12.0
PACKAGE
SOT-223
MARKING
ABE### ABF### UTC1117
OPERATING TEMP. RANGE
0C to =125C 0C to =125C 0C to =125C
TO-252 (DPAK)
ACCT #### UTC1117 CCCT ####
UTC1117CCCT # represents the date code
3.3
0C to =125C
APPLICATION DESCRIPTIONS
1. Output voltage adjustment
Like most regulators, the UTC1117 regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation: R2 VOUT=VREF(1+ )+LADJ R2 R1
IADJ 50 A VIN 3 IN ADJ 1 OUT 2 R1 VREF VOUT
R2
provided internally.
2.Thermal Protection
UTC1117 has thermal protection which limits junction temperature to 150C. However, device functionality is only guaranteed to a maximum junction temperature of +125C. The power dissipation and junction temperature for UTC1117 in DPAK package are given by PD=(VIN-VOUT)xLOUT
Note: TJUNCTION must not exceed 125C
3.Current Limit Protection
UTC1117 is protected against overload conditions. Current protection is triggered at typically 1.5A..
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x
TJUNCTION=TAMBIENT+(PD
JA)
x
On fixed versions of UTC1117, the voltage divider is
x
VOUT=VREF(1+
R2 )+LADJ R1
R2
5
UTC1117
4.Stability and Load Regulation
LINEAR INTEGRATED CIRCUIT
UTC1117 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a Note: It is important that the ESR for this capacitor does not exceed 0.5. The output capacitor does not have a theoretical upper limit and increase stability. COUT=100F or more is typical for high current regulator design. For the adjustable version, the best load regulation is accomplished when the top for the resistor divider (R1) is connected directly to the output pin of the UTC1117. When so connected, RP is not multiplied by the divider ratio. For fixed output versions, the top of R1 is internally connected to the output and ground pin can be connected to low side of the load.
Connect R2 to load RP Parasitic Line Resistance VIN 3 IN ADJ 1 R1 (connect R1 to case) RL OUT 2
5.Thermal Consideration
The UTC1117 series contain thermal limiting circuitry designed to protect itself for over-temperature conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-to-case, case-to-heatsink interface and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended.
ADVANCED APPLICATIONS
Adjustable Output Voltage
* Vo=1.5~3.45V VIN UTC1117ACCT
10
F tantalum of 50F aluminum electrolytic is sufficient.
10F ** 10F R2 2K
R1 10F 1K
*VO=Vref(1+R2/R1)+IadjxR2 **Optional for improved ripple rejection
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UTC1117
Paralleling Regulators
VIN
LINEAR INTEGRATED CIRCUIT
* 20m UTC1117 Io=0 to 2A 10F 10F Vo
UTC1117 * 20m
*20m is ballast resistance The inter-connection of #18 wire could act as ballast resistance. Regulator with Reference
VIN
UTC1117
1K 10F ** 10F zener Diode or Voltage Reference
* Vo
10F
* VO= Vref +VZ (VZ is breakdown voltage of zneer Diode) ** Optional for improved ripple rejection
Regulator with Reverse Diode Protection
VIN * Vo
UTC1117
10F
100F
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