PDF CM2730 Data sheet ( Hoja de datos )

Número de pieza	CM2730
Descripción	300ma DUAL LOW Noise CMOS LDO
Fabricantes	Champion Microelectronic Corporation
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No Preview Available ! www.DataSheet4U.net CM2730 300mA DUAL LOW NOISE CMOS LDO GENERAL DESCRIPTION FEATURES The CM2730 dual LDO family are positive linear voltage regulators developed utilizing CMOS technology. CM2730 contains two LDOs, one with pre-set output voltage (master LDO1), the other with adjustable output voltage (slave LDO2). Each LDO owns its input voltage, bandgap reference voltage, and protection circuit, which reduce noise and cross talk between two LDOs. This dual LDO family is featured low quiescent current (60µA typ.), low dropout voltage, and high output voltage accuracy. Built-in low on-resistance transistor provides low dropout voltage and large output current. 2.2µF or greater can be used as an output capacitors. The PTSSOP-8 package is recommended for configuring portable devices and large current application, respectively. These robust devices are designed to prevent device failure under the worst operation condition with both Thermal Shutdown and Current Fold-back. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Very Low Shutdown Current < 2.0µA Very Low Dropout Voltage: 300mV @ 300mA Low Current Consumption: Typ. 60µA, Max. 70µA Output Voltage: master LDO1 fixed at 2.5V or 3.3V, and the slave LDO2 adjustable voltage Output Current Range: 0mA ~ 300mA per LDO PTSSOP-08 Package with Power Pad High Accuracy Output Voltage: +/- 1.5% Input Range of 2.6V to 7.0V Independent Thermal Shutdown Power Sequence Power Good Output Function Independent Bandgap Current Limiting 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 PIN CONFIGURATION 1 2 3 4 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. PTSSOP-08 (PT-08) Front View GND VOUT1 VIN1 ENB VFB2 VOUT2 VIN2 PGB 8 7 6 5 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 1 1 page www.DataSheet4U.net CM2730 300mA DUAL LOW NOISE CMOS LDO ELECTRICAL CHARACTERISTICS (CONTI.) TA = +25℃; unless otherwise noted Parameter Test Conditions CM2730 Unit Min. Typ. Max. PGB (Note2) VIN1>VIN1(MIN), VIN2>VIN2(MIN) ,ENB=GND, VOUT1>0.95VOUT1, VOUT2>0.95VOUT2, VIN1>VIN1(MIN), VIN2>VIN2(MIN) ,ENB=GND, VOUT1<0.78VOUT1, or VOUT2<0.78VOUT2 0.1 V VIN1 V LDO2 Turn on Threshold Voltage (Vo1) ENB=0, VIN1>VIN1(MIN), VIN2>VIN2(MIN) 0.95VOUT1 LDO2 Turn off Threshold Voltage (Vo1) ENB=0, VIN1>VIN1(MIN), VIN2>VIN2(MIN) 0.78VOUT1 ENB Input Threshold VSH VSL VIN1=2.6V to 7V VIN1=2.6V to 7V VIN1/2+0.8 VIN1/2-0.8 V V Note 1. VIN(MIN) = VOUT + Dropout Voltage Note 2: Dual LDO contains 2 LDO, one is fix output voltage 2.5V or 3.3V (2 versions), which is master LDO1, the other is adjustable output voltage, which is slave LDO2. At normal operation condition, master LDO1 turns on first, and then slave LDO2 turns on as master LDO1 output voltage reaches to 95% spec. VOUT1. Slave LDO2 will turn off as master output decreases to 78% spec. VOUT1. DETAILED DESCRIPTION The CM2730 family of CMOS regulators provide a preset output voltage LDO (master LDO1), and one adjustable output voltage LDO (slave LDO2) in which each contains p-channel pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown, and short circuit protection. CM2730 has a power sequence. When master LDO1’s output voltage, which is preset value in design, reaches to its 95~96% nominal output value, internal logic circuits begin to enable the slave LDO2 function which is adjustable output voltage. When both LDO output voltage values are larger than 95% of their nominal output voltage values, the PGB will go low. 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 CM2730 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The CM2730 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 CM2730 is stable with output capacitors to ground of 2.2µF or greater. It can keep stable even with higher or poor ESR capacitors. A capacitor is recommended between the input and ground to stabilize each input voltage. The input capacitor should be larger than 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground termination is desirable. 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 5 5 Page

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