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 Output Thermal Protection Error Amp. Bandgap Reference ADJ/COM PIN CONFIGURATION TO-252 Top View 1 2 3 1: GND/ADJ 2: VOUT 3: VIN SOT-223 Top View 1 2 3 1: GND/ADJ 2: VOUT 3: VIN YOUWANG ELECTRONICS CO.LTD 1 UTC1117 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Input Voltage Thermal Resistance SOT-223 Value Unit VIN 15 V θ 27* JC (Junction to Case) TO-252 Thermal Resistance 15 θ SOT-223 °C/W 63* JA (Junction to Ambient) TO-252 Operating Junction Temperature Range 156 TJ 0 ~ 125 Storage Temperature Range TSTG -65 ~ 150 Lead Temperature ( 10 sec ) TLEAD 260 °C * Surface Mounted on 4 layers board based on JEDIC standard JC15.1 ELECTRICAL CHARACTERISTICS UTC1117ACCT (Adjustable Version) Characteristic Reference voltage Line regulation * Symbol VREF Test Condition Min Typ. Max VIN=5V, TJ=25°C 1.238 1.250 1.262 IO=10mA Over Temp. 1.225 1.250 1.275 VIN=4.75~7V,IO=10mA TJ=25°C 0.2 TJ=25°C 0.3 RegLINE VIN=4.75~15V,IO=10mA Over Temp. Load regulation 0.05 0.3 Over Temp. 0.2 0.4 1.0 1.2 RegLOAD VIN=5V,IO=10mA~1A ΔVo=±1% Dropout voltage VD IO=10mA~1A, Current limit IS VIN=2.75~7V TC VIN=2.75~7V,IO=10mA~1A IADJ VIN=2.75~7V, IO=10mA~1A Temperature 0.4 TJ=25°C Over Temp. Over Temp. 1.0 Unit V % V A %/°C 0.005 coefficient TJ=25°C Adjust pin current 55 Over Temp. Adjust pin current change Temperature stability ΔI 90 VIN=2.75~7V, IO=10mA~1A, Over Temp. 0.2 ADJ µA 5 TS VIN=2.75~7V, IO=10mA~1A, Over Temp. Minimum load current IO VIN=5V 5 RMS output noise VN TJ=25°C 0.003 %Vo Ripple rejection ratio RA VIN=5V, IO=1A, Over Temp. 72 dB YOUWANG ELECTRONICS CO.LTD 0.5 60 % 10 mA 2 UTC1117 LINEAR INTEGRATED CIRCUIT UTC1117lCCCT (Fixed 3.3V Output Version) Characteristic Output voltage Symbol Vo Test Condition VIN=5V,IO=0A Min Typ. Max TJ=25°C 3.270 3.3 3.330 Over Temp. 3.234 3.3 3.330 TJ=25°C VIN=4.75~7V,IO=0A Line regulation * Load regulation RegLINE VIN=4.75~15V,IO=0A RegLOAD VIN=5V,IO=0A~1A 0.3 Over Temp. 0.4 TJ=25°C 0.05 0.3 Over Temp. 0.2 0.4 1.0 1.2 ΔVo=±1%, Over Temp. VD IO=0A~1A, Current limit IS VIN=4.75~7V,Over Temp., Over Temp. Quiescent Current lQ VIN=5V,IO=0A~1A, Over Temp. TC VIN=4.75~7V,IO=0A~1A Temperature stability TS VIN=5V, IO=100mA~1A, Over Temp. RMS output noise VN Ripple rejection ratio RA Temperature coefficient 1.0 % V A 6 0.005 TJ=25°C VIN=5V, IO=1A, Over Temp. V 0.2 TJ=25°C Dropout voltage Unit 60 13 mA %/°C 0.5 % 0.003 %Vo 72 dB * Line regulation test circuit VIN 3 IN ADJ VOUT OUT 2 100 1 164 10µ Tan 10µ Tan TYPICAL APPLICATION UTC1117 4.75V to 15V 10µF Tan 10µF Tan Load Input range depends on Vo. Please refer to electrical characteristics YOUWANG ELECTRONICS CO.LTD 3 UTC1117 LINEAR INTEGRATED CIRCUIT PERFORMANCE CHARACTERISTICS Output Voltage deviation( ‰ ) 1.Load regulation 2.Short circuit current 1.6 0.00 -0.10 -0.15 -0.20 -0.25 -50 -30 -10 10 30 Tenperature ( 50 ℃) 70 Minmum Input/Output Differential ( V ) Reference Voltage ( V ) 1.246 1.244 1.242 1.240 1.238 0 25 50 Temperature ( 75 100 125 ℃) 5.Adjust pin current 0.4 0.2 0.0 1.2 1.3 1.5 1.7 2 5 10 15 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 ) 6.Minimum operating current 45 40 35 30 25 20 15 10 5 0 25 50 3.5 Minimum Operating Current ( mA) Adjust Pin Current (µA ) 0.6 4.Dropout voltage 1.248 0 1.0 0.8 Input/Output Differential ( V ) 1.252 1.250 -50 -25 1.2 90 3.Temperature stability -50 -25 1.4 Shot Circuit Current ( A ) -0.05 75 100 125 ℃) 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 Temperature ( 3 5 10 15 20 25 30 35 Input/Output Differential ( V ) 7.Load transient response 8.Line transient response Line Transient Response Output 0.1 Voltage 0 Deviation ( V ) -0.1 ∆ Vo 30mV Cout=10UF 0 Cout=1UF Cout=0UF 2 Load Current (A) Cin=10UF Io 1 Vo=Deviation -30mV Vin=5V Vo=3.3V Preload=100mA Cin=Co=IUF Io=0.1A Vo=3.3V 6V 0 Vin 5V 0.0 25 Time ( vS) 50 YOUWANG ELECTRONICS CO.LTD Time (µS ) 4 UTC1117 LINEAR INTEGRATED CIRCUIT ORDERING INFORMATION PART NUMBER OUTPUT VOLTAGE UTC1117ACGT 1.30 to 12.0 UTC1117CCGT 3.3 UTC1117ACCT 1.30 to 12.0 UTC1117CCCT 3.3 PACKAGE MARKING SOT-223 OPERATING TEMP. RANGE ABE### 0°C to =125°C ABF### 0°C to =125°C UTC1117 TO-252 0°C to =125°C ACCT #### (DPAK) UTC1117 0°C to =125°C CCCT #### # represents the date code 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, VIN 3 IN the VREF is available externally as 1.25V between VOUT ADJ OUT 2 VOUT R1 1 VREF IADJ 50µ A 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 R2 × On fixed versions of UTC1117, the voltage divider is VOUT=VREF(1+ provided internally. ×R2 R2 )+LADJ R1 2.Thermal Protection UTC1117 has thermal protection which limits junction temperature to 150°C. However, device functionality is only guaranteed to a maximum junction temperature of +125°C. The power dissipation and junction temperature for UTC1117 in DPAK package are given by PD=(VIN-VOUT) ×L OUT ×θ TJUNCTION=TAMBIENT+(PD JA) Note: TJUNCTION must not exceed 125°C 3.Current Limit Protection UTC1117 is protected against overload conditions. Current protection is triggered at typically 1.5A.. YOUWANG ELECTRONICS CO.LTD 5 UTC1117 LINEAR INTEGRATED CIRCUIT 4.Stability and Load Regulation 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 10 RP Parasitic Line Resistance μF tantalum of 50μF aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does 3 IN VIN not exceed 0.5Ω. ADJ OUT 2 1 The output capacitor does not have a theoretical upper limit and increase stability. COUT=100 R1 (connect R1 to case) μF or more is typical RL for high current regulator design. For the adjustable version, the best load regulation is accomplished when the top for the resistor divider (R1) is Connect R2 to load 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. 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 UTC1117ACCT VIN R1 10µF 10µF ** 10µF 1K R2 2K *VO=Vref(1+R2/R1)+Iadj ×R2 **Optional for improved ripple rejection YOUWANG ELECTRONICS CO.LTD 6 UTC1117 LINEAR INTEGRATED CIRCUIT Paralleling Regulators Vo * 20mΩ UTC1117 VIN Io=0 to 2A 10µF 10µF UTC1117 * 20mΩ *20m Ω is ballast resistance The inter-connection of #18 wire could act as ballast resistance. Regulator with Reference * Vo UTC1117 VIN 1K 10µF 10µF ** 10µF zener Diode or Voltage Reference * VO= Vref +VZ (VZ is breakdown voltage of zneer Diode) ** Optional for improved ripple rejection Regulator with Reverse Diode Protection VIN 10 UTC1117 μF * Vo 100 YOUWANG ELECTRONICS CO.LTD μF 7