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| CM2852 300mA CMOS LDO WITH EN & PG GENERAL DESCRIPTION The CM2852 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-23-5 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 CM2852 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 2.5V to 7.0V Thermal Shutdown Current Limiting Power Good Output Function Compact Package: SOT-23-5 Factory Pre-set Output Voltages Short Circuit Current Fold-Back Low Temperature Coefficient ! ! ! ! ! ! ! ! ! ! ! APPLICATIONS ! ! ! ! Battery-powered devices Personal communication devices Home electric/electronic appliances PC peripherals 24 Hours Technical Support--WebSIM Champion provides customers an online circuit simulation tool called WebSIM. You could simply logon our website at www.champion-micro.com for details. TYPICAL APPLICATIONS IN 1M IN PG C M 2852 GND OUT EN OUT 5V C1 1uF C PG * For program m ing delay > typ. 5m s (O ptional) C2 4 .7 u F 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 1 CM2852 300mA CMOS LDO WITH EN & PG PIN CONFIGURATION SOT-23-5 Top View 5 4 OUT GND 2 VIN 1 BLOCK DIAGRAM IN EN 3 PG OUT 1uA O vercurrent Shutdown Therm al Shutdown EN R1 PG + AM P + Vref = 1.176V Vref x 85% R2 Digital PG 1-5m s GND 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 2 CM2852 300mA CMOS LDO WITH EN & PG ORDERING INFORMATION Part Number CM2852ACIM25 CM2852SIM25 Output Voltage 1.2V 3.3V Temperature Range -40 ~ +85 -40 ~ +85 Package SOT-23-5 SOT-23-5 Note: For other pre-set output voltage, please contact Champion Sales office. ABSOLUTE MAXIMUM RATINGS Input Voltage Output Current Output Voltage .................................................. +7V ............................... PD / (VIN - Vo) ........................ GND-0.3V to VIN+0.3V ................................................ B OPERATING RATINGS Ambient Temperature Range (TA) ......... -40 to +85 Junction Temperature Range ........... -40 to +125 ESD Classification THERMAL INFORMATION Parameter Thermal Resistance (jc) Internal Power Dissipation (PD) (T = 100) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) SOT-23-5 SOT-23-5 Maximum 160 250 150 300 Unit /W mW *With Junction sink capable of twice times ofjc Caution: Stress above the listed absolute rating may cause permanent damage to the device. 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 3 CM2852 300mA CMOS LDO WITH EN & PG ELECTRICAL CHARACTERISTICS TA = +25; unless otherwise noted CM2852 Min. Note 1 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) 150 450 150 30 30 -0.1 -.015 -0.3 135 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 3.0 0.1 85 85 1 7 0.1 1 7 3.0 VIN Vrms A A V V A V %V O(NOM) A V V ms dB VOUT < 2.0V 2.0V Symbol VIN VOUT VDROPOUT IO ILIM ISC IQ IGND REGLINE REGLOAD OTS OTH TC PSRR Test Conditions Unit V % VOUT > 1.2V VOUT > 1.2V VOUT < 0.8V IO = 0mA IO = 1mA to 300mA IOUT=1mA, VIN=VOUT+1 to VOUT+2 IO=1mA to 300mA Output Voltage Noise EN Input Bias Current EN Input Threshold Shutdown Supply Current Shutdown Output Voltage Output Under Voltage PG Leakage Current PG Voltage Rating PG Voltage Low Delay Time to PG Note 1. VIN(MIN) = VOUT + VDROPOUT eN IEH IEL VEH VEL ISD VO, SD VUV ILC VPG VOL tDELAY 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 2.5V<=VOUT <= 5.0V 1.2V<=VOUT <= 2.5V VPG = 7V VOUT in regulation ISINK = 2mA VIN=2.5V to 6.0V (Note 2) Note 2: Delay time will be varied by input voltage, but the delay time will still be in the spec from 1ms to 7ms when VIN rise time <2ms. 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 4 CM2852 300mA CMOS LDO WITH EN & PG DETAILED DESCRIPTION The CM2852 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 150, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120. The CM2852 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The CM2852 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 CM2852 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 The Enable pin normally floats high. 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 CM2852 includes the Power Good feature. Under normal operating condition which means output voltage is within the SPEC, PG should be high. If Vout is less than 85% VOUT SPEC, PG will go low. As VOUT comes back and reaches to the 95% VOUT SPEC, the PG will go high after 1ms~7ms again. (See Timing Diagram as below) VIN = VEN= 3.3V, Iload = 120mA, VOUT = 1.2V, Delay time = 4.5ms 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 5 CM2852 300mA CMOS LDO WITH EN & PG TYPICAL ELECTRICAL CHARACTERISTICS 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 6 CM2852 300mA CMOS LDO WITH EN & PG 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 7 CM2852 300mA CMOS LDO WITH EN & PG PACKAGE DIMENSION SOT-23-5 (M25) D 5 4 b1 c1 With Plating A c A1 A2 E1 b Base Metal Section B-B E b b1 c c1 D E 1 2 3 e e1 E1 b L L1 e e1 1 1 2 A2 A 2 A1 See Section B-B 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation L L1 Page 8 CM2852 300mA CMOS LDO WITH EN & PG NUMBERING SCHEME Ordering Number: CM2852XYZ (note1) note1: CM2852: 300mA CMOS LDO X : Suffix for voltage output (note 2) Y : Suffix for Temperature Range (note 3) Z : Suffix for Package Type (note 4) note 2: see CMOS LDO Voltage Suffix Table CM2852 will provide options of AC(1.2V), S(3.3V) note 3: Y= I : -40~+85 (only I grade support for all CMOS LDOs) note 4: Z is single alphabet with or without digits M25 : SOT-23-5 (TR only) CMOS LDO Voltage Suffix Table Output Voltage 1.2V 1.3V 1.4V 1.5V 1.6V 1.7V 1.8V 1.9V 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V Suffix AC AB AA A B C D E F G H I J K L Output Voltage 2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V 3.6V 3.7V 3.8V 3.9V 4.0V Suffix M N O P Q R S T U V W X Y Z 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 9 CM2852 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 of CMC products in such applications is In order to minimize risks associated with the customer's applications, the use in life-support applications, devices or systems or other critical applications. understood to be fully at the risk of the customer. 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 2003/12/05 Rev. 1.1 Champion Microelectronic Corporation Page 10 |
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