UTC1117

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 YOUWANG ELECTRONICS CO.LTD 1 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=25°C Over Temp. TJ=25°C TJ=25°C Over Temp. VIN=4.75~7V,IO=10mA Line regulation * RegLINE VIN=4.75~15V,IO=10mA Load regulation Dropout voltage Current limit Temperature coefficient Adjust pin current Adjust pin current change Temperature stability Minimum load current RMS output noise Ripple rejection ratio RegLOAD VIN=5V,IO=10mA~1A VD IS TC VIN=2.75~7V VIN=2.75~7V,IO=10mA~1A TJ=25°C Over Temp. IADJ VIN=2.75~7V, IO=10mA~1A IADJ VIN=2.75~7V, IO=10mA~1A, Over Temp. TS IO VN RA VIN=2.75~7V, IO=10mA~1A, Over Temp. VIN=5V TJ=25°C VIN=5V, IO=1A, Over Temp. 60 YOUWANG ELECTRONICS CO.LTD ±Δ IO=10mA~1A, Vo= θ θ 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 % TJ=25°C Over Temp. 1% Over Temp. Over Temp. 1.0 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 µA Δ % 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=25°C Over Temp. TJ=25°C TJ=25°C Over Temp. TJ=25°C Over Temp. 1%, 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 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=25°C VIN=5V, IO=1A, Over Temp. * Line regulation test circuit VIN 3 IN 10µ Tan TYPICAL APPLICATION UTC1117 4.75V to 15V Input range depends on Vo. Please refer to electrical characteristics YOUWANG ELECTRONICS CO.LTD ±Δ IO=0A~1A, Vo= ADJ 1 OUT 2 100 VOUT 164 10µ Tan 10µF Tan 10µF Tan Load 3 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 (µA ) 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) YOUWANG ELECTRONICS CO.LTD ℃ 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 (µS ) 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 0°C to =125°C 0°C to =125°C 0°C to =125°C 0°C to =125°C TO-252 (DPAK) ACCT #### UTC1117 CCCT #### UTC1117CCCT # represents the date code 3.3 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 50µ 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 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 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 θ× TJUNCTION=TAMBIENT+(PD × PD=(VIN-VOUT) LOUT JA) × On fixed versions of UTC1117, the voltage divider is × 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 0.5Ω. The output capacitor does not have a theoretical upper for high current regulator design. RP Parasitic Line Resistance VIN 3 IN ADJ 1 OUT 2 R1 (connect R1 to case) RL 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 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 10µF ** 10µF R2 2K UTC1117ACCT **Optional for improved ripple rejection YOUWANG ELECTRONICS CO.LTD × μ limit and increase stability. COUT=100 μ μ 10 F tantalum of 50 F aluminum electrolytic is sufficient. F or more is typical R1 1K 1 0 µF *VO=Vref(1+R2/R1)+Iadj R2 6 UTC1117 Paralleling Regulators VIN 1 0 µF LINEAR INTEGRATED CIRCUIT * 20mΩ UTC1117 Io=0 to 2A 10µF Vo UTC1117 * 20mΩ The inter-connection of #18 wire could act as ballast resistance. Regulator with Reference VIN 1 0 µF ** 10µF * VO= Vref +VZ (VZ is breakdown voltage of zneer Diode) ** Optional for improved ripple rejection Regulator with Reverse Diode Protection VIN * Vo YOUWANG ELECTRONICS CO.LTD μ μ 10 F Ω *20m is ballast resistance UTC1117 1K zener Diode or Voltage Reference * Vo 10µF UTC1117 100 F 7