LM37102CGDP

1A Low-Voltage Low-Dropout Regulator LM37102C FEATURES  Fixed and adjustable output voltages to 1.24V  Stable with MLCC and Ceramic Capacitors  500mV typical dropout at 1A Ideal for 3.0V to 2.5V conversion Ideal for 2.5V to 1.8V or 1.5V conversion  1A minimum guaranteed output current  1% initial accuracy  Low ground current  Current limiting and thermal shutdown  Reversed-battery protection  Reversed-leakage protection  Fast transient response  Moisture Sensitivity Level 3 SOP-8 & SOP-8PP PKG APPLICATION       ORDERING INFORMATION Device Battery Powered Equipments Motherboards and Graphic Cards Microprocessor Power Supplies Peripheral Cards High Efficiency Linear Regulators Battery Chargers Package LM37102CGD SOP-8 LM37102CGDP SOP-8PP DESCRIPTION The LM37102C is 1A low-dropout linear voltage regulators that provide low-voltage, high-current output. The LM37102C offers extremely low dropout (typically 500mV at 1A). The LM37102C is adjustable regulators, SOP8 and SOP-8PP. The LM37102C is ideal for PC add-in cards that need to convert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to1.8V. A guaranteed maximum dropout voltage of 630mV overall operating conditions allows the LM37102C to provide 2.5V from a supply as low as 3.13V and 1.8V from a supply as low as 2.5V. The LM37102C is fully protected with over current limiting, thermal shutdown, and reversed-battery protection. Absolute Maximum Ratings (Note 1) CHARACTERISTIC SYMBOL MIN. MAX. UNIT Supply Voltage VIN - 0.3 + 20 V Enable Voltage VEN - + 20 V Lead Temperature (Soldering, 5 sec) TSOL - 260 ℃ Storage Temperature Range TSTG -65 + 150 ℃ Jul. 2016 – R2.0 -1 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C Operating Ratings (Note 2) CHARACTERISTIC SYMBOL MIN. MAX. UNIT Supply Voltage VIN + 2.5 + 16 V Enable Voltage VEN + 16 V + 125 ℃ Junction Temperature TJ -40 Ordering Information VOUT ADJ Package Order No. Description Supplied As Status SOP-8 LM37102CGD 1A, Adjustable, Enable Reel Active SOP-8PP LM37102CGDP 1A, Adjustable, Enable Reel Active LM 37102C D : SOP-8 DP : SOP-8PP Package Type Material Class G : Halogen Free Root Name Product Code PIN CONFIGURATION EN 1 8 GND EN 1 8 GND VIN 2 7 GND VIN 2 7 GND VOUT 3 6 GND 6 GND FLG/ADJ 4 5 GND 5 GND VOUT 3 FLG/ADJ SOP-8 Jul. 2016 – R2.0 Exposed PAD 4 SOP-8PP -2 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C PIN DESCRIPTION SOP-8 PKG Pin No. Name Function 1 EN Chip Enable 2 VIN Input Supply 3 VOUT Output Voltage 4 FLG / ADJ Error Flag Output or Output Adjust 5/6/7/8 GND Ground Thermal Exposed PAD Connect to Ground. TYPICAL APPLICATION LM37102 VIN Enable Shutdown IN EN VOUT OUT GND 10uF ADJ R1 R2 10uF 1.5V / 1A Adjustable Regulator Jul. 2016 – R2.0 -3 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C ELECTRICAL CHARACTERISTICS TJ = 25°C, bold values indicate -40°C ≤ TJ ≤ +125°C; unless noted otherwise. Symbol Parameters VOUT Output Voltage VADJ Adjustable Pin Voltage Condition Min. 10mA 10mA ≤ IOUT ≤ 1A, VOUT+1V ≤ VIN ≤16V -1 -2 1.228 1.215 1.203 (Note 8) IADJ VDO IGND IOUT(lim) Adjust Pin Bias Current Typ. Max. Unit 1 2 1.252 1.265 1.277 % % 3 20 uA 1.24 Line Regulation IOUT=1mA, VOUT +1V ≤ VIN ≤ 16V 0.06 0.5 % Load Regulation VIN= VOUT +1V, 1mA ≤ IOUT ≤ 1A 0.2 1 % IOUT=100mA, ΔVOUT = -1% 100 250 IOUT=1A, ΔVOUT = -1% 500 630 IOUT=100mA, VIN= VOUT+1V 3.8 mA IOUT=1A, VIN= VOUT+1V 25 mA VOUT=0V, VIN=VOUT+1V 1.4 Dropout Voltage Ground Current (Note 5) (Note 6) Current Limit ΔVOUT/ΔT Output Voltage Temp. (Note 4) Coefficient VEN Enable Input Voltage logic low (off) logic high (on) 0.01 VEN=0.0V TEN Delay time to Nominal Output Voltage (Note 7) A 100 ppm/ °C 0.25 V V 3 Enable Input Current mV mV mV mV 2.5 2.0 VEN=16V IEN V IOUT =10mA, VIN =VOUT +1V, VEN =0V to VIN 50 IOUT =500mA, VIN =VOUT +1V, VEN =0V to VIN 250 IOUT =1.0A, VIN =VOUT +1V, VEN =0V to VIN 350 30 75 1 4 μA μA μA μA μs Note 1. Exceeding the absolute maximum ratings may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. PD (max)= (TJ (max) - TA) ÷ θJA, where θJA -junction-to-ambient thermal resistance. Note 4. Output voltage temperature coefficient is ΔVOUT (worst case) ÷ (TJ(max) - TJ(min)) where TJ(max) is +125°C and TJ(min) is 0°C. Note 5. VDO = VIN - VOUT when VOUT decreases to 99% of its nominal output voltage with VIN = VOUT + 1V. For output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum input voltage being 2.5V. Minimum input operating voltage is 2.5V. Note 6. IGND is the quiescent current. IIN = IGND + IOUT. Note 7. Delay time is measured after VEN=VIN. CIN=COUT=10μF. Note 8. VADJ ≤ VOUT ≤ (VIN - 1V), 2.5V ≤ VIN ≤ 16V, 10mA ≤ IL ≤ 1 A. Jul. 2016 – R2.0 -4 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C APPLICATION INFORMATION Output Capacitor The LM37102C regulators are designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 2.2uF is recommended to prevent oscillations. Larger values of output capacitance can decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LM37102C, will increase the effective output capacitor value. Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior over temperature and applied voltage. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Input Capacitor An input capacitor of 1μF or greater is recommended when the device is more than 4 inches away from the bulk ac supply capacitance or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be used for the bypassing. Larger values will help improving the ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage. Enable Input The LM37102C features an active-high enable input (EN) that allows on-off control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only micro amperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to V IN and pulled up to the maximum supply voltage. Minimum Load Current The LM37102C regulator is specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. A 10mA minimum load current is necessary for proper regulation. Adjustable Regulator Design The LM37102C allows programming the output voltage any-where between 1.24V and the 16V maximum operating rating of the family. Two resistors are used. Resistors can be quite large, up to 1MΩ, because of the very high input impedance and low bias current of the sense comparator: The resistor values are calculated by : R1=R2(Vout/1.240-1) Where Vout is the desired output voltage. Figure 1 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see below). The current consumed by feedback resisters R1 and R2 is calculated by: Ires = Vout / (R1+ R2). Jul. 2016 – R2.0 -5 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C LM37102C VIN Enable Shutdown IN EN VOUT OUT GND ADJ R1 R2 Figure 1. Adjustable Regulator with Resistors Maximum Output Current Capability The LM37102C can deliver a continuous current of 1A over the full operating junction temperature range. However, the output current is limited by the restriction of power dissipation which differs from packages. A heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. With respect to the applied package, the maximum output current of 1A may be still undeliverable due to the restriction of the power dissipation of LM37102C. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. The temperatures over the device are given by: TC = TA + PD X θCA / TJ = TC + PD X θJC / TJ = TA + PD X θJA where TJ is the junction temperature, T C is the case temperature, TA is the ambient temperature, PD is the total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by: PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT) = (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND where IGND is the operating ground current of the device which is specified at the Electrical Characteristics. The maximum allowable temperature rise (T Rmax) depends on the maximum ambient temperature (T Amax) of the application, and the maximum allowable junction temperature (T Jmax): TRmax = TJmax – TAmax The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the formula: θJA = TRmax / PD = (TJmax – TAmax) / PD Jul. 2016 – R2.0 -6 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C LM37102C is available in SOP-8 and SOP-8PP package. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If the maximum allowable value of θJA calculated above is over 75°C/W for SOP-8PP package and 130°C/W for SOP-8, no heat sink is needed since the package can dissipate enough heat to satisfy these requirements. If the value for allowable θ JA falls near or below these limits, a heat sink or proper area of copper plane is required. In summary, the absolute maximum ratings of thermal resistances are as follow: Absolute Maximum Ratings of Thermal Resistance Characteristic Symbol Thermal Resistance Junction-To-Ambient / SOP-8 Thermal Resistance Junction-To-Ambient / SOP-8PP Rating Unit θJA-SOP-8 130 °C/W θJA-SOT-8PP 75 °C/W 2 No heat sink / No air flow / No adjacent heat source / 20 mm copper area. (TA=25°C) Jul. 2016 – R2.0 -7 - HTC 1A Low-Voltage Low-Dropout Regulator LM37102C REVISION NOTICE The description in this datasheet can be revised without any notice to describe its electrical characteristics properly. Jul. 2016 – R2.0 -8 - HTC