LTC1844ES5-1.8#TRPBF

LTC1844 Series 150mA, Micropower, Low Noise, VLDO Linear Regulator U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Very Low Dropout: 90mV at 150mA 30mV at 50mA (LTC1844-3.3) Wide Input Voltage Range: 1.6V to 6.5V Low 35µA Supply Current, Even in Dropout Low Noise: 60µVRMS (10Hz to 100kHz) ±1.75% Voltage Accuracy Over Temperature, Voltage and Current Ranges Fast Transient Response 10nA Supply Current in Shutdown Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V Adjustable Output Voltage: 1.25V to 6V Output Current Limit Reverse-Battery and Reverse-Current Protection No Protection Diodes Needed Stable with 1µF Output Capacitor Stable with Ceramic Capacitors Short-Circuit and Thermal Overload Protection Low Profile (1mm) SOT-23 Package U APPLICATIO S ■ ■ ■ Portable Instruments and Battery-Powered Systems Bluetooth/802.11 Cards Cellular Phones PDAs and Notebook Computers U ■ TYPICAL APPLICATIO The LTC®1844 Series are low noise VLDOTM (very low dropout) linear regulators designed for low power/portable applications. These regulators can operate from input voltages as low as 1.6V. Typical output noise is only 30µVRMS and typical dropout for the LTC1844-3.3 is just 90mV at the maximum load current of 150mA, reducing to 30mV at 50mA. The internal P-channel MOSFET pass transistor requires no base current, allowing the device to draw only 35µA during normal operation, independent of the dropout voltage and load current. The quiescent current falls to a negligible 10nA during shutdown. Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1µF, reverse-battery and reverse-current protection, short-circuit and thermal overload protection and output current limiting. The LTC1844 regulators are available in a low profile (1mm) SOT-23 (ThinSOTTM) package. , LTC and LT are registered trademarks of Linear Technology Corporation. VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC1844-3.3 Dropout Voltage vs Load Current 120 Fixed Voltage Low Noise, VLDO Linear Regulator 100 VIN 3.3V TO 6.5V IN 1µF OFF ON VOUT 3.3V OUT LTC1844-3.3 BYP SHDN GND 1µF 0.1µF 1844 TA01 DROPOUT VOLTAGE (mV) ■ DESCRIPTIO 80 60 40 20 0 0 25 50 75 100 IOUT (mA) 125 150 1844 TA02 1844fa 1 LTC1844 Series W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage (IN) ....................................... – 7V to 7V Input Voltage SHDN, BYP, ADJ .................................... – 0.3V to 7V Output Voltage OUT ........................................................ – 0.3V to 7V OUT to IN .................................................. – 7V to 7V Output Short-Circuit Duration ......................... Indefinite Operating Junction Temperature Range (Notes 2, 10) .....................................–40°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C U U W PACKAGE/ORDER I FOR ATIO IN 1 IN 1 5 OUT SHDN 3 4 BYP GND 2 BYP 3 4 ADJ 4 ADJ S5 PACKAGE 5-LEAD PLASTIC TSOT-23 S5 PACKAGE 5-LEAD PLASTIC TSOT-23 S5 PACKAGE 5-LEAD PLASTIC TSOT-23 5 OUT IN 1 5 OUT GND 2 GND 2 SHDN 3 TOP VIEW TOP VIEW TOP VIEW TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W SEE THE APPLICATIONS INFORMATION SECTION SEE THE APPLICATIONS INFORMATION SECTION SEE THE APPLICATIONS INFORMATION SECTION ORDER PART NUMBER S5 PART MARKING ORDER PART NUMBER S5 PART MARKING ORDER PART NUMBER S5 PART MARKING LTC1844ES5-1.5 LTC1844ES5-1.8 LTC1844ES5-2.5 LTC1844ES5-2.8 LTC1844ES5-3.3 LTF1 LTF2 LTF3 LTQK LTF4 LTC1844ES5-SD LTE8 LTC1844ES5-BYP LTE9 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2) SYMBOL PARAMETER VIN Input Voltage IIN Quiescent Current CONDITIONS MIN ● TYP 1.6 SHDN = VIN 35 ● ● IINSHDN VIN Shutdown Supply Current SHDN = 0V VOUT% Regulated Output Voltage (Notes 3, 4, 5) LTC1844-3.3 LTC1844-3.3 VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA LTC1844-2.8 LTC1844-2.8 0.01 MAX UNITS 6.5 V 55 80 µA µA 1 µA ● –1.50 –1.75 1.50 1.75 %VOUT %VOUT VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA ● –1.50 –1.75 1.50 1.75 %VOUT %VOUT LTC1844-2.5 LTC1844-2.5 VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA ● –1.50 –1.75 1.50 1.75 %VOUT %VOUT LTC1844-1.8 LTC1844-1.8 VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA ● –1.50 –1.75 1.50 1.75 %VOUT %VOUT 1844fa 2 LTC1844 Series ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2) SYMBOL VADJ ∆VLNR PARAMETER ADJ Pin Voltage (Notes 3, 5) Line Regulation (Notes 3, 5) CONDITIONS ∆VDO Dropout Voltage (Notes 6, 7) MAX UNITS VIN = 2.0V to 6.5V, IOUT = 0mA to 150mA VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA VIN = 2.0V to 6.5V, IOUT = 0mA to 100mA ● ● –1.50 –2.00 –2.50 1.50 2.00 2.00 %VOUT %VOUT %VOUT LTC1844-BYP LTC1844-BYP LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA ● ● –1.50 –1.75 –3.50 1.50 1.75 1.75 %VOUT %VOUT %VOUT LTC1844-SD LTC1844-SD LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA ● ● –1.50 –1.75 –3.50 1.50 1.75 1.75 %VOUT %VOUT %VOUT LTC1844-BYP LTC1844-BYP LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA 1.233 1.230 1.208 1.25 ● ● 1.271 1.274 1.274 V V V LTC1844-SD LTC1844-SD LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA 1.233 1.230 1.208 1.25 ● ● 1.271 1.274 1.274 V V V LTC1844-3.3 VIN = 3.4V to 6.5V, IL = 1mA ● 4 20 mV LTC1844-2.8 VIN = 2.9V to 6.5V, IL = 1mA ● 4 20 mV LTC1844-2.5 VIN = 2.6V to 6.5V, IL = 1mA ● 4 20 mV LTC1844-1.8 VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.9V to 6.5V, IL = 1mA VIN = 1.9V to 6.5V, IL = 1mA ● 4 4 4 20 20 30 mV mV mV LTC1844-1.5 VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA ● 4 4 4 20 20 80 mV mV mV VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA ● 4 4 4 20 20 80 mV mV mV VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA ● ● 4 4 4 20 20 80 mV mV mV LTC1844-3.3 VIN = 3.8V, IOUT = 0mA to 150mA ● 9 20 mV LTC1844-2.8 VIN = 3.3V, IOUT = 0mA to 150mA ● 9 20 mV LTC1844-2.5 VIN = 3.0V, IOUT = 0mA to 150mA ● 9 20 mV LTC1844-1.8 VIN = 2.3V, IOUT = 0mA to 150mA ● 9 20 mV LTC1844-1.5 VIN = 2.2V, IOUT = 0mA to 150mA VIN = 2.0V, IOUT = 0mA to 100mA ● ● 9 9 20 40 mV mV LTC1844-BYP VIN = 2.2V, IOUT = 0mA to 150mA VIN = 1.75V, IOUT = 0mA to 100mA ● ● 9 9 20 50 mV mV LTC1844-SD VIN = 2.2V, IOUT = 0mA to 150mA VIN = 1.75V, IOUT = 0mA to 100mA ● ● 9 9 20 50 mV mV LTC1844-3.3 IOUT = 50mA IOUT = 150mA ● ● 30 90 55 150 mV mV LTC1844-2.8 IOUT = 50mA IOUT = 150mA ● ● 35 105 60 165 mV mV LTC1844-2.5 IOUT = 50mA IOUT = 150mA ● ● 45 135 75 200 mV mV LTC1844-1.8 IOUT = 50mA IOUT = 150mA ● ● 85 230 120 300 mV mV LTC1844-SD Load Regulation (Notes 3, 5) TYP LTC1844-1.5 LTC1844-1.5 LTC1844-1.5 LTC1844-BYP ∆VLDR MIN ● ● ● 1844fa 3 LTC1844 Series ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2) SYMBOL PARAMETER ILIM Output Current Limit en Output Voltage Noise VSHDN SHDN Input Threshold tDELAY Shutdown Exit Delay CONDITIONS MIN TYP MAX UNITS LTC1844-1.5 IOUT = 50mA IOUT = 150mA ● ● 115 350 160 450 mV mV LTC1844-BYP IOUT = 50mA IOUT = 150mA ● ● 45 135 75 200 mV mV LTC1844-SD IOUT = 50mA IOUT = 150mA ● ● 45 135 75 200 mV mV ● 160 f = 10Hz to 100kHz, CBP = 0.1µF, COUT = 10µF, IL = 150mA f = 10Hz to 100kHz, CBP = 0.1µF, COUT = 1µF, IL = 150mA ● CBP = 0.01µF, COUT = 1µF, No load CBP = 0.01µF, COUT = 1µF, No load 0.35 350 mA 60 65 µVRMS µVRMS 0.65 0.9 V 70 100 200 µs µs ● °C TSHDN Thermal Shutdown Limit ∆TSHDN Thermal Shutdown Hysteresis IADJ ADJ Pin Bias Current (Notes 3, 8) ● 30 100 nA IIRL Input Reverse Leakage Current LTC1844-3.3, LTC1844-2.8, LTC1844-2.5, LTC1844-1.8, LTC1844-1.5, VIN = –5V, VOUT = 0V ● 200 500 µA LTC1844-BYP, LTC1844-SD, VIN = –5V, VOUT = 0V ● 1000 1500 µA Output Reverse Leakage Current (Note 9) VIN = 0V, VOUT = VOUT(NOMINAL) VIN = 0V, VOUT = VOUT(NOMINAL) 0.01 ● 0.1 1.2 µA µA VOSH Start-Up Overshoot RL = 1k, SHDN Rise Time ≤ 1µs 2 %VOUT VRP Output Ripple Rejection (VIN – VOUT) = 1V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 100mA 50 dB IORL 155 °C 10 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1844 is tested and specified under pulse load conditions such that TJ ≈ TA. The LTC1844E is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the – 40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: The LTC1844 adjustable versions are tested and specified for these conditions with the ADJ pin connected to the OUT pin for a VOUT(NOMINAL) of 1.25V. Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 5: The LTC1844’s high precision degrades slightly at high temperatures (TJ > 70°C) with input voltages below 2.2V. The lower output voltage versions have been split into higher and lower accuracy input voltage ranges to reflect this. Note 6: To ensure adequate input supply voltage, the LTC1844 adjustable versions are tested and specified for these conditions with an external resistor divider (two 100k resistors) for an output voltage of 2.50V. The external resistor divider will add a 5µA load on the output. Note 7: Dropout voltage is (VIN – VOUT) when VOUT falls to 100mV below its nominal value measured at VIN = VOUT + 0.5V. For example, the LTC1844-3.3 is tested by measuring the VOUT at VIN = 3.8V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN – VOUT) is then measured and defined as ∆VDO. Note 8: ADJ pin bias current flows into the ADJ pin. Note 9: Output reverse leakage current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. Note 10: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 1844fa 4 LTC1844 Series U W TYPICAL PERFOR A CE CHARACTERISTICS VOUT vs Temperature VOUT vs Temperature 1.820 VOUT = 1.5V VOUT vs Temperature 2.520 VOUT = 1.8V 1.815 2.515 1.510 1.810 2.510 1.505 1.805 2.505 1.500 VOUT (V) 1.515 VOUT (V) VOUT (V) 1.520 1.800 1.795 2.495 1.490 1.790 2.490 1.485 1.785 2.485 0 50 75 25 TEMPERATURE (°C) 100 1.780 – 50 – 25 125 0 50 75 25 TEMPERATURE (°C) 100 1844 G01 2.480 – 50 – 25 125 VOUT = 2.8V VOUT = 3.3V 2.810 3.310 1.260 2.805 3.305 1.255 VOUT (V) 1.265 VOUT (V) 3.315 3.300 3.295 1.245 2.790 3.290 1.240 2.785 3.285 1.235 50 75 25 TEMPERATURE (°C) 100 125 3.280 – 50 – 25 0 50 75 25 TEMPERATURE (°C) 100 1844 G04 Quiescent Current vs Temperature 30 20 VOUT = 2.8V 50 25 75 0 TEMPERATURE (°C) 100 125 400 350 300 1844 G07 200 –50 –25 100 125 ILOAD = 1mA 750 250 10 50 75 25 TEMPERATURE (°C) SHDN Threshold vs Temperature 800 SHDN THRESHOLD (mV) CURRENT LIMIT (mA) 40 0 1844 G05 450 50 IQ (µA) 1.230 – 50 – 25 Current Limit vs Temperature 500 60 0 –50 –25 125 VOUT = ADJ 1844 G05 70 125 1.250 2.795 0 100 VOUT vs Temperature 1.270 2.815 2.780 – 50 – 25 50 75 25 TEMPERATURE (°C) 1844 G03 VOUT vs Temperature 3.320 2.800 0 1844 G02 VOUT vs Temperature 2.820 VOUT (V) 2.500 1.495 1.480 – 50 – 25 VOUT = 2.5V 700 650 600 550 500 450 50 25 75 0 TEMPERATURE (°C) 100 125 1844 G08 400 – 50 – 25 0 50 75 25 TEMPERATURE (°C) 100 125 1844 G09 1844fa 5 LTC1844 Series U W TYPICAL PERFOR A CE CHARACTERISTICS RMS Output Noise vs Load Current (10Hz to 100kHz) Input Ripple Rejection vs Frequency 300 100 60 COUT = 10µF 90 CBYP = 1000pF IL = 100µA 80 RIPPLE REJECTION (dB) CBYP = 0µF 200 150 100 CBYP = 0.1µF 50 RIPPLE REJECTION (dB) 250 OUTPUT NOISE (µVRMS) Input Ripple Rejection vs Temperature 70 60 50 40 30 20 50 40 30 20 10 10 0 0.01 0.1 1 10 100 LOAD CURRENT (mA) 1000 0 10 100 1k 10k FREQUENCY (Hz) 1844 G10 100k 1M 1844 G11 0 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 125 1844 G12 U U U PI FU CTIO S IN (Pin 1): Power for LTC1844 and Load. Power is supplied to the device through the IN pin. The IN pin should be locally bypassed to ground if the LTC1844 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor in battery-powered circuits. A capacitor in the range of 0.1µF to 1µF is usually sufficient. The LTC1844 is designed to withstand reverse voltages on the IN pin with respect to both ground and the output pin. In the case of a reversed input, which can happen if a battery is plugged in backwards, the LTC1844 will act as if there is a large resistor in series with its input and only a small amount of current will flow. GND (Pin 2): Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat dissipation. SHDN (Pin 3, Fixed and SD Devices): Shutdown, Active Low. This pin is used to put the LTC1844 into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left floating and must be tied to the input pin if not used. If reverse-battery protection is desired, the SHDN pin must be tied to the input pin through a large value resistor (10k to 1M). ADJ (Pin 4, Adjustable Devices): Output Adjust. For the adjustable versions of the LTC1844, this is the input to the error amplifier. It has a typical bias current of 30nA flowing into the pin. The ADJ pin reference voltage is 1.25V referenced to ground. The output voltage range is 1.25V to 6V and is typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2. BYP (Pin 4, Fixed/Pin 3, BYP Devices): Noise Bypass. The BYP pin is used to augment the internal noise filter to improve low noise performance. A small low leakage bypass capacitor from this pin to ground will filter the input of the error amplifier to lower the output voltage noise. Any value may be used; larger values will result in lower output noise, but will increase initial power-up time. Shutdown exit delay time after a brief shutdown (