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| CM2855 300mA CMOS LDO WITH EN & PG GENERAL DESCRIPTION The CM2855 family is positive, linear regulators featured low quiescent current (30A typ.) with low dropout voltage, making them ideal for battery applications. The space-saving SOT-23-6 package is attractive for "Pocket" and "Hard Held" applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The CM2855 is stable with an output capacitance of 2.2F or greater. FEATURES Very Low Dropout Voltage Low Current Consumption: Typ. 30A, Max. 35A High Accuracy Output Voltage: +/- 2.5% Guaranteed 300mA Output Input Range of 2.6V to 7.0V Thermal Shutdown Current Limiting Power Good Output Function Compact Package: SOT-23-6 Adjustable Output Voltages Short Circuit Current Fold-Back Low Temperature Coefficient APPLICATIONS Battery-powered devices Personal communication devices Home electric/electronic appliances PC peripherals TYPICAL APPLICATIONS IN IN EN PG OUT C M 2855 GND ADJ OUT R1 5V C1 1uF R2 C3 2.2uF Note: 1. Suggest to add a small Cap 100pF between OUT and connection of R1and R2 to get less VOUT ripple Vout = Vref * (1 + R1/R2); Vref = 1.176V 2. Enable pin can not be floating. 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 1 CM2855 300mA CMOS LDO WITH EN & PG PIN CONFIGURATION SOT-23-6 Top View 6 5 4 VOUT ADJ GND VIN 1 2 BLOCK DIAGRAM IN EN PG 3 OUT 1uA Overcurrent Shutdown Thermal Shutdown EN PG + AMP ADJ + Vref x 85% Vref = 1.176V GND 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 2 CM2855 300mA CMOS LDO WITH EN & PG ORDERING INFORMATION Part Number CM2855IM26 CM2855GIM26* *Note: G : Suffix for Pb Free Product Output Voltage Adjustable Adjustable Temperature Range -40J ~ +85J -40J ~ +85J Package SOT-23-6 SOT-23-6 ABSOLUTE MAXIMUM RATINGS Input Voltage Output Current Output Voltage .................................................. +7V ............................... PD / (VIN - Vo) ........................ GND-0.3V to VIN+0.3V OPERATING RATINGS Ambient Temperature Range (TA) ......... -40J Junction Temperature Range ........... -40J to +85J to +125J ESD Classification ................................................ B THERMAL INFORMATION Parameter Thermal Resistance (K JA) Internal Power Dissipation (PD) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) SOT-23-6 SOT-23-6 Maximum 260 Note 1 150 300 Unit J /W J J Caution: Stress above the listed absolute rating may cause permanent damage to the device. Note 1: PD(MAX) = (TJ(MAX) - TA)/JA, where JA depends on the printed circuit layout. 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 3 CM2855 300mA CMOS LDO WITH EN & PG ELECTRICAL CHARACTERISTICS TA = +25; VIN = VIN(MIN) unless otherwise noted CM2855 Min. Note 2 IO = 1mA IO = 300mA, VOUT=VO(NOM)-2.5%, 1.2V< VO(NOM)<=2.0V 2.0V< VO(NOM)<=2.5V 2.5V< VO(NOM) 300 800 150 30 30 1.168 -0.1 -.015 -0.3 1.176 0.02 0.03 0.06 0.2 150 30 25 IO = 100mA CO=2.2F ceramic f=10Hz to 100kHz IO = 10mA f=1kHz f=10kHz f=100kHz CO=2.2F 60 50 40 30 0.1 1.0 VIN/2+0.8V 0 0 VIN/2-0.8V 2.0 0.1 1 7 89.5 96.5 0.1 7.8 3.8 3.0 VIN g Vrms g A g A V V g A V g A V % % V ms ms dB 35 35 1.184 0.1 0.15 0.3 1 -2.5 Typ. Max. 7 2.5 1300 800 300 mA mA mA g A g A V % % % % J J ppm/J mV Parameter Input Voltage Output Voltage Accuracy Dropout Voltage Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current Bandgap Reference Line Regulation Load Regulation Over Temperature Shutdown Over Temperature Hysteresis VOUT Temperature Coefficient Power Supply Rejection Symbol VIN VOUT VDROPOUT IO ILIM ISC IQ IGND VBG REGLINE REGLOAD OTS OTH TC PSRR Test Conditions Unit V % VOUT > 1.2V VOUT > 1.2V VOUT < 0.8V (Note 3) IO = 0mA IO = 1mA to 300mA VO = VBG, load = 10mA IOUT=1mA, VIN=VOUT+1 to VOUT+2 VOUT < 2.0V 2.0V Output Voltage Noise EN Input Bias Current EN Input Threshold Shutdown Supply Current Shutdown Output Voltage PG Leakage Current PG Voltage Rating PG Low Threshold PG High Threshold PG Voltage Low Delay Time to PG (Note 3) eN IEH IEL VEH VEL ISD VO, SD ILC VPG VEN=VIN, VIN=2.7V to 7V VEN=0V, VIN=2.7V to 7V VIN=2.7V to 7V VIN=2.7V to 7V VIN=5.0V, VOUT=0V, VEN < VEL IO=300mA VPG = 7V VOUT in regulation % of VO (PG ON) % of VO (PG OFF) VOL tDELAY ISINK = 2mA VIN = 5V VIN = 3V Note 2. VIN(MIN) = VOUT + VDROPOUT Note 3. Guaranteed by Design, not 100% test. VIN start time needs to be less than 2ms. Note 4. Short Circuit Current and Current limit value will increase as input voltage is larger than VIN(MIN) 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 4 CM2855 300mA CMOS LDO WITH EN & PG DETAILED DESCRIPTION The CM2855 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, output short circuit protection, thermal shutdown, and power good function. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, short output protection, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150J , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120J . The CM2855 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The CM2855 also incorporates current fold-back to reduce power dissipation when the output is short-circuited. This feature becomes active when the output drops below 0.95V, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.95V. EXTERNAL CAPACITOR The CM2855 is stable with an output capacitor to ground of 2.2F or greater. It can keep stable even with higher or poor ESR capacitors. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be larger than 0.1F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "quiet" ground termination is desirable. ENABLE When actively, pulled low, the PMOS pass transistor shut off, and all internal circuits are powered down. In this state, the quiescent current is less than 1A. This pin behaves much like an electronic switch. POWER GOOD The CM2855 includes the Power Good feature. Normally, Pin 4 is floating, however, when the output is lower than 85% of the specified voltage, it pulls low. This can occur under the following conditions: 1) 2) 3) Input Voltage too low During Over-Temperature During Over-Current 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 5 CM2855 300mA CMOS LDO WITH EN & PG TYPICAL ELECTRICAL CHARACTERISTICS 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 6 CM2855 300mA CMOS LDO WITH EN & PG 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 7 CM2855 300mA CMOS LDO WITH EN & PG 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 8 CM2855 300mA CMOS LDO WITH EN & PG PACKAGE DIMENSION SOT-23-6 (M26) D 6 5 4 b1 c1 c With Plating A A1 A2 E E1 Base Metal b Section B-B b b1 c c1 D E 1 e 2 3 E1 e1 b L L1 e e1 1 A2 A 1 2 2 A1 See Section B-B 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation L L1 Page 9 CM2855 300mA CMOS LDO WITH EN & PG IMPORTANT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. HsinChu Headquarter 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan T E L : +886-3-567 9979 F A X : +886-3-567 9909 Sales & Marketing 11F, No. 306-3, SEC. 1, Ta Tung Road, Hsichih, Taipei Hsien 221, Taiwan T E L : +886-2-8692 1591 F A X : +886-2-8692 1596 2004/6/01 Rev. 1.2 Champion Microelectronic Corporation Page 10 |
Price & Availability of CM2855IM26
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