ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 ULTRA SMALL MICROPOWER SC70 LOW DROPOUT REGULATORS DESCRIPTION The ZXCL series are very small low dropout regulators designed for use in low power and severely space limited applications. For applications requiring improved performance over alternative devices, the ZXCL is also offered in the 5 pin SOT23 package with an industry standard pinout. The devices operate with a low dropout voltage, typically of only 85mV at 50mA load. Supply current is minimised with a ground pin current of only 50µA at full 150mA load. Logic control allows the devices to be shut down, consuming typically less than 10nA. These features make the device ideal for battery powered applications where power economy is critical. The devices feature thermal overload and over-current protection and are available with output voltages of 2.5V, 2.6V, 2.8V, 3V, 3.3V and 4V. Other voltage options between 1.5V and 4V can be provided. Contact Zetex marketing for further information. The ZXCL series are manufactured using CMOS processing, however advanced design techniques mean that output noise is improved even when compared to other bipolar devices. The parts have been designed with space sensitive systems in mind. They are available in the ultra small SC70 package, which is half the size of other SOT23 based regulator devices. FEATURES APPLICATIONS • 5-pin SC70 package for the ultimate in space • Cellular and Cordless phones saving • Palmtop and laptop computers • 5-pin SOT23 industry standard pinout • PDA • Low 85mV dropout at 50mA load • Hand held instruments • 50µA ground pin current with full 150mA load • Camera, Camcorder, Personal Stereo • Typically less than 10nA ground pin current on • PCMCIA cards shutdown • 2.5, 2.6, 2.8, 3, 3.3 and 4 volts output • Very low noise, without bypass capacitor • Portable and Battery-powered equipment • Thermal overload and over-current protection • -40 to +85°C operating temperature range TYPICAL APPLICATION CIRCUIT PACKAGE FOOTPRINT Total Aea 2.1mm x 2mm =4.2mm2 Output Voltage Battery Supply ZXCL Total Aea 2.8mm x 2.9mm =8.12mm2 ISSUE 5 - NOVEMBER 2001 1 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 ABSOLUTE MAXIMUM RATINGS Terminal Voltage with respect to GND VIN -0.3V to 7.0V EN -0.3V to 10V VO -0.3V to 5.5V Output short circuit duration Continuous Power Dissipation Operating Temperature Range Storage Temperature Range Infinite Internally limited -40°C to +85°C -55°C to +125°C Package Power Dissipation (TA=25°C) SC70 SOT23-5 300mW (Note 1) 450mW (Note 1) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS VIN = VO + 0.5V, typical values at TA = 25 C V (Unless otherwise stated) SYMBOL PARAMETER CONDITIONS LIMITS MIN V IN Input Voltage VO Output Voltage ∆V O /∆T I O(MAX) (note2) I O = 1mA ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 I O = 100mA V O + 0.5V < V IN < V IN max. ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 2.450 2.548 2.744 2.940 3.234 3.920 I OLIM Over Current Limit IQ Ground pin current MAX 5.5 2.5 2.6 2.8 3.0 3.3 4.0 2.425 2.522 2.744 2.910 3.201 3.880 Output Voltage Temperature Coefficient Output Current TYP UNITS 2.550 2.652 2.856 3.060 3.366 4.080 2.575 2.678 2.884 3.090 3.399 4.120 -15 150 100 160 105 ZXCL250 only ZXCL250 only No Load IO = 150mA, I O = 100mA, V V V ppm/°C mA 230 25 50 40 800 750 50 120 100 mA A A A ISSUE 5 - NOVEMBER 2001 2 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 ELECTRICAL CHARACTERISTICS VIN = VO + 0.5V, typical values at TA=25°C (Unless otherwise stated) SYMBOL PARAMETER CONDITIONS LIMITS MIN V DO Dropout Voltage Note 3 ZXCL250 I O =10mA I O =50mA I O =100mA ZXCL260 I O =10mA I O =50mA I O =100mA ZXCL280 I O =10mA I O =50mA I O =100mA ZXCL300 I O =10mA I O =50mA I O =100mA ZXCL330 I O =10mA I O =50mA I O =100mA ZXCL400 I O =10mA I O =50mA I O =100mA UNITS TYP MAX 15 85 163 325 15 85 155 310 15 85 140 280 15 85 140 280 15 85 140 280 15 85 140 280 mV mV mV mV mV mV ⌬V LNR Line Regulation VIN=(VO+0.5V) to 5.5V, IO=1mA 0.02 0.1 %/V ⌬V LDR Load Regulation IO=1mA to 100mA 0.01 0.04 %/mA EN Output Noise Voltage f=10Hz to 100kHz, C O =10µF, V ENH Enable pin voltage for normal operation T A = -40°C V ENL Enable pin voltage for output shutdown V ENHS Enable pin hysteresis I EN Enable Pin input current V EN =5.5V 100 nA I QSD Shutdown supply current V EN =0V 1 µA T SD Thermal Shutdown Temperature 165 °C µV rms 50 2 2.2 10 V 0 0.8 V 150 125 mV Device testing is performed at TA=25⬚C. Device thermal performance is guaranteed by design. Note1: Maximum power dissipation is calculated assuming the device is mounted on a PCB measuring 2 inches square Note 2: Output Voltage will start to rise when VIN exceeds a value or approximately 1.3V. For normal operation, VIN (min) > VOUT (nom) + 0.5V. Note 3: Dropout voltage is defined as the difference between VIN and VO, when VO has dropped 100mV below ISSUE 5 - NOVEMBER 2001 3 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 TYPICAL CHARACTERISTICS (ZXCL280 shown) 0.25 Dropout Voltage (V) 6 Voltage (V) 5 4 VIN 3 2 IOUT = 100mA 1 0.20 0.15 0.10 0.05 IOUT = 1mA 0 0.00 0 1 2 3 4 5 6 0 50 75 100 125 150 175 Output Current (mA) Input to Output Characteristics Dropout Voltage v Output Current 25.0 2.81 VIN = 3.3V No Load Ground Current (µA) Output Voltage (V) 25 Input Voltage (V) 2.80 VIN = 3.3V No Load 24.8 24.6 24.4 24.2 24.0 23.8 23.6 23.4 23.2 2.79 -50 -25 0 25 50 75 23.0 -50 100 0 25 50 75 Temperature (°C) Output Voltage v Temperature Ground Current v Temperature 30 100 60 No Load Ground Current (µA) Ground Current (µA) -25 Temperature (°C) 25 20 15 10 5 0 55 50 VIN = 5V 45 VIN = 3.3V 40 35 30 25 20 0 1 2 3 4 5 0 25 50 75 100 125 Input Voltage (V) Load Current (mA) Ground Current v Input Voltage Ground Current v Load Current 150 ISSUE 5 - NOVEMBER 2001 4 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 TYPICAL CHARACTERISTICS (ZXCL280 shown) 100 COUT = 1mF Enable 5 VIN = 5V IL = 1mA IL = 100mA 4 3 VIN = 3.3V IL = 1mA IL = 100mA 2 1 0 0 10 20 30 40 50 60 70 80 COUT = 10mF -50 COUT = 1mF 0.1 0.2 0.3 0.4 Start-Up Response Load Response 0.5 6 COUT = 1mF Tr & Tf = 2.5ms VIN (V) VIN (V) 4 COUT = 1mF Tr & Tf = 2.5ms 5 4 DVOUT (mV) 3 20 10 0 -10 -20 0.1 0.2 0.3 0.4 0.5 20 10 0 -10 -20 0.0 0.1 0.2 0.3 0.4 Time (ms) Time (ms) Line Rejection IL = 1mA Line Rejection IL = 100mA 0.5 10 80 IL = 100mA, COUT = 1mF All Caps Ceramic Surface Mount IL = 50mA 70 60 Noise µ V/√ Hz DVOUT (mV) COUT = 10mF 0 Time (ms) 3 Power Supply Rejection (dB) COUT = 1mF 50 Time (µs) 5 50 40 COUT = 10mF 30 COUT = 2.2mF 20 IL = 100mA, COUT = 10mF 1 0.1 COUT = 1mF 10 0 10 0 -100 0.0 90 100 6 0.0 VIN = 5V IL = 1mA to 50mA 50 100 DVOUT (mV) Voltage (V) IL(mA) 6 100 1k 10k No Load, COUT = 1mF No Load, COUT = 10mF 100k 0.01 10 1M 100 1k 10k 100k Frequency (Hz) Frequency (Hz) Power Supply Rejection v Frequency Output Noise v Frequency ISSUE 5 - NOVEMBER 2001 5 1M ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 PIN DESCRIPTION Pin Name Pin Function V IN Supply Voltage G ND Ground EN Active HIGH Enable input. TTL/CMOS logic compatible. Connect to V IN or logic high for normal operation N/C No Connection VO Regulator Output CONNECTION DIAGRAMS SOT23-5 Package Suffix – E5 VIN GND EN 1 5 SC70 Package Suffix – H5 VO 2 3 4 N/C VIN GND EN 1 5 VO EN N/C N/C GND 2 4 3 Top View ZXCLXXX SC70 Package Suffix –H5 1 3 Top View ZXCLXXX 5 VIN 4 VO 2 Top View ZXCL1XXX SCHEMATIC DIAGRAM ISSUE 5 - NOVEMBER 2001 6 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 Input to Output Diode Increased Output current In common with many other LDO regulators, the ZXCL Any ZXCL series device may be used in conjunction device has an inherent diode associated with the with an external PNP transistor to boost the output output series pass transistor of each regulator. This current capability. In the application circuit shown diode has its anode connected to the output and its below, a FMMT717 device is employed as the external cathode to the input. The internal diode is normally pass element. This SOT23 device can supply up to 2.5A reverse biased, but will conduct if the output is forced above the input by more than a VBE (approximately maximum current subject to the thermal dissipation 0.6V). Current will then flow from Vout to Vin. For safe may be used to supply higher levels of current. Note operation, the maximum current in this diode should that with this arrangement, the dropout voltage will be be limited to 5mA continuous and 30mA peak. An increased by the VBE drop of the external device. Also, external schottky diode may be used to provide care should be taken to protect the pass transistor in protection when this condition cannot be satisfied. the event of excessive output current. limits of the package (625mW). Alternative devices Q1 FMMT717 VIN VOUT R1 5.6R U1 ZXCL SERIES C3 EN VO GND VIN 1uF C2 C1 1uF 1uF Scheme to boost output current to 2A ISSUE 5 - NOVEMBER 2001 7 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 APPLICATIONS INFORMATION Enable Control A TTL compatible input is provided to allow the regulator to be shut down. A low voltage on the Enable R pin puts the device into shutdown mode. In this mode the regulator circuit is switched off and the quiescent current reduces to virtually zero (typically less than C 10nA). A high voltage on the Enable pin ensures normal operation. The Enable pin can be connected to VIN or driven from an independent source of up to 10V maximum. (e.g. Figure 1 Circuit Connection CMOS logic) for normal operation. There is no clamp diode from the Enable pin to VIN, so the VIN pin may be at any voltage within its operating range irrespective of the voltage on the Enable pin. Current Limit The ZXCL devices include a current limit circuit which restricts the maximum output current flow to typically 230mA. Practically the range of over-current should be considered as minimum 160mA to maximum 800mA. The device’s robust design means that an output short Td Figure 2 Start up delay (Td) circuit to any voltage between ground and VOUT can be tolerated for an indefinite period. Thermal Overload Thermal overload protection is included on chip. When VIN Td(NOM) = RCIn VIN − 1.5 the device junction temperature exceeds a minimum 125°C the device will shut down. The sense circuit will re-activate the output as the device cools. It will then Calculation of start up delay as above cycle until the overload is removed. The thermal overload protection will be activated when high load currents or high input to output voltage differentials cause excess dissipation in the device. Start up delay A small amount of hysteresis is provided on the Enable pin to ensure clean switching. This feature can be used to introduce a start up delay if required. Addition of a simple RC network on the Enable pin provides this function. The following diagram illustrates this circuit connection. The equation provided enables calculation of the delay period. ISSUE 5 - NOVEMBER 2001 8 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 APPLICATIONS INFORMATION (Cont) Capacitor Selection and Regulator Stability Power Dissipation Pmax = (Tjmax – Tamb) / θja The device is designed to operate with all types of output capacitor, including tantalum and low ESR ceramic. For stability over the full operating range from no load to maximum load, an output capacitor with a minimum value of 1µF is recommended, although this can be increased without limit to improve load transient performance. Higher values of output capacitor will also reduce output noise. Capacitors with ESR less than 0.5Ω are recommended for best results. The maximum output current (Imax) at a given value of Input voltage (VIN) and output voltage (VOUT) is then An input capacitor of 1µF (ceramic or tantalum) is recommended to filter supply noise at the device input given by and will improve ripple rejection. The maximum allowable power dissipation of the device for normal operation (Pmax), is a function of the package junction to ambient thermal resistance (θja), maximum junction temperature (Tjmax), and ambient temperature (Tamb), according to the expression: Imax = Pmax / (VIN - VOUT ) The value of θja is strongly dependent upon the type of PC board used. Using the SC70 package it will range from approximately 280 °C/W for a multi-layer board to around 450°C/W for a single sided board. It will range from 180°C/W to 300°C/W for the SOT23-5 package. To avoid entering the thermal shutdown state, Tjmax The input and output capacitors should be positioned close to the device, and a ground plane board layout should be used to minimise the effects of parasitic track resistance. Dropout Voltage and SOT23-5 packages is shown in the following graph. Ground Current Max Power Dissipation (mW) should be assumed to be 125°C and Imax less than the over-current limit,(IOLIM). Power derating for the SC70 The output pass transistor is a large PMOS device, which acts like a resistor when the regulator enters the dropout region. The dropout voltage is therefore proportional to output current as shown in the typical characteristics. The use of a PMOS device ensures a low value of ground current under all conditions including dropout, start-up and maximum load. 500 400 Power Supply Rejection and Load Transient Response SOT23 300 Line and Load transient response graphs are shown in the typical characteristics. 200 SC70 These show both the DC and dynamic shift in the output voltage with step changes of input voltage and load current, and how this is affected by the output capacitor. 100 0 -40 -20 0 20 40 60 Temperature (°C) Derating Curve 80 100 If improved transient response is required, then an output capacitor with lower ESR value should be used. Larger capacitors will reduce over/undershoot, but will increase the settling time. Best results are obtained using a ground plane layout to minimise board parasitics. ISSUE 5 - NOVEMBER 2001 9 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 PACKAGE DIMENSIONS SOT23-5 SC70 DIM DIM Millimetres MIN MAX Millimetres MIN MAX 0.90 1.45 A 1.00 A A1 0.10 A1 0.00 0.15 0.90 1.3 A2 0.70 A2 b 0.15 b 0.35 0.50 C 0.08 C 0.09 0.20 D 2.00BSC D 2.80 3.00 E 2.10BSC E 2.60 3.00 E1 1.25BSC E1 1.50 1.75 e 0.65BSC e 0.95 REF e1 1.30BSC e1 1.90 REF L 0.26 0.46 L 0.10 0.60 a° 0 8 a° 0 10 ISSUE 5 - NOVEMBER 2001 10 ZXCL250 ZXCL260 ZXCL280 ZXCL300 ZXCL330 ZXCL400 ORDERING INFORMATION DEVICE Output Package Voltage V Partmarking ZXCL250H5 2.5 SC70 L25A ZXCL260H5 2.6 SC70 L26A ZXCL280H5 2.8 SC70 L28A ZXCL300H5 3.0 SC70 L30A ZXCL330H5 3.3 SC70 L33A ZXCL400H5 4.0 SC70 L40A ZXCL1250H5 2.5 SC70 L25C ZXCL1260H5 2.6 SC70 L26C ZXCL1280H5 2.8 SC70 L28C ZXCL1300H5 3.0 SC70 L30C ZXCL1330H5 3.3 SC70 L33C ZXCL1400H5 4.0 SC70 L40C ZXCL250E5 2.5 SOT23-5 L25B ZXCL260E5 2.6 SOT23-5 L26B ZXCL280E5 2.8 SOT23-5 L28B ZXCL300E5 3.0 SOT23-5 L30B ZXCL330E5 3.3 SOT23-5 L33B ZXCL400E5 4.0 SOT23-5 L40B © Zetex plc 2001 Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstraße 19 D-81673 München Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong, Hong Kong China Telephone: (852) 26100 611 Fax: (852) 24250 494 These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com ISSUE 5 - NOVEMBER 2001 11