CM2730

CM2730 300mA DUAL LOW NOISE CMOS LDO GENERAL DESCRIPTION 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. ! ! ! ! ! ! ! ! ! ! ! ! FEATURES ! ! 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 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. PIN CONFIGURATION PTSSOP-08 (PT-08) Front View 1 2 3 4 G ND VO UT1 VIN1 ENB VFB2 VO UT2 VIN2 PG B 8 7 6 5 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 1 CM2730 300mA DUAL LOW NOISE CMOS LDO TYPICAL APPLICATION R X1 OUTPUT1 INPUT1 G ND VOUT1 VIN1 ENB VFB2 VOUT2 VIN2 PGB VFB2 OUTPUT2 INPUT2 R X2 C1 C2 RX3 C4 C3 2.2uF 1.0uF 1.0uF 2.2uF BLOCK DIAGRAM VIN 1 VIN 2 VO U T2 VO U T 1 O vercurrent S hutdow n1 O vercurrent S hutdow n2 Therm al S hutdow n1 Sequence C ontrol1 EN B R1 Therm al S hutdow n2 R X1 AM P1 AM P2 + VF B1 + VFB2 Vref2 = 1.176V R X2 G ND 2002/09/30 Preliminary Rev. 0.3 Vref1 = 1.176V Pow er C ontrol PG B R2 G ND Champion Microelectronic Corporation Page 2 CM2730 300mA DUAL LOW NOISE CMOS LDO PIN DESCRIPTION Pin Number 1 2 3 4 5 6 7 8 Symbol GND VOUT1 VIN1 ENB PGB VIN2 VOUT2 VFB2 Description Master & slave LDO ground Master LDO1 output voltage Master LDO1 input voltage Master LDO1 enable Dual LDO power good signal Slave LDO2 input voltage Slave LDO2 output voltage Salve LDO2 feedback signal ORDERING INFORMATION Part Number CM2730KIT CM2730SIT Output Voltages 2.5V & Adjustable 3.3V & Adjustable Temperature Range -40℃ ~ +85℃ -40℃ ~ +85℃ Package PTSSOP-08 (PT-08) PTSSOP-08 (PT-08) Note: For other pre-set output voltage requirements of fixed LDO1, 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 VIN1 – VIN2 < 0.8V …..…... -40℃ to +125℃ ESD Classification THERMAL INFORMATION Parameter Thermal Resistance (Θjc) Thermal Resistance (Θja) Internal Power Dissipation (PD)(ΔT = 100℃) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) Maximum Unit ℃/W ℃/W mW ℃ ℃ 150 300 *With Junction sink capable of twice times ofΘjc Caution: Stress above the listed absolute rating may cause permanent damage to the device. 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 3 CM2730 300mA DUAL LOW NOISE CMOS LDO ELECTRICAL CHARACTERISTICS TA = +25℃; unless otherwise noted Parameter Input Voltage 1 Output Voltage 1 Accuracy Output Current 1 Current Limit 1 Short Circuit Current 1 Quiescent Current 1 Ground Pin Current Line Regulation 1 Master LDO1 Load Regulation 1 Dropout Voltage 1 Power Supply Rejection 1 Over Temperature Shutdown 1 Over Temperature Hysteresis Output Voltage Temp. Coeff. 1 Output Noise 1 Input Voltage 2 Output Voltage 2 Accuracy Output Current 2 Current Limit 2 Short Circuit Current 2 Quiescent Current 2 Io2 = 1mA to 300mA VOUT2 > 1.2V VOUT2 > 1.2V VOUT2 < 0.95V VIN2=5V, No Load IOUT2=5mA, VIN2=VOUT2+1 to VOUT2+2, VOUT2 1.2V VOUT1 < 0.95V VIN1=5V, No Load VIN1=5V, Io1 = 1mA to 300mA IOUT1=5mA, VIN1=VOUT1+1 to VOUT1+2, 2.0VVIN1(MIN), VIN2>VIN2(MIN) , ENB = VIN1 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 4 CM2730 300mA DUAL LOW NOISE CMOS LDO ELECTRICAL CHARACTERISTICS (CONTI.) TA = +25℃; unless otherwise noted CM2730 Min. Typ. Max. 0.1 VIN1 0.95VOUT1 0.78VOUT1 VIN1/2+0.8 VIN1/2-0.8 V V Parameter Test Conditions VIN1>VIN1(MIN), VIN2>VIN2(MIN) ,ENB=GND, Unit V V PGB (Note2) VOUT1>0.95VOUT1, VOUT2>0.95VOUT2, VIN1>VIN1(MIN), VIN2>VIN2(MIN) ,ENB=GND, VOUT1VIN2(MIN) ENB=0, VIN1>VIN1(MIN), VIN2>VIN2(MIN) VIN1=2.6V to 7V VIN1=2.6V to 7V LDO2 Turn on Threshold Voltage (Vo1) LDO2 Turn off Threshold Voltage (Vo1) ENB Input Threshold Note 1. VIN(MIN) = VOUT + Dropout Voltage VSH VSL 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 CM2730 300mA DUAL LOW NOISE CMOS LDO TYPICAL ELECTRICAL CHARACTERISTICS 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 6 CM2730 300mA DUAL LOW NOISE CMOS LDO CL=2uF RL=10Ω 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 7 CM2730 300mA DUAL LOW NOISE CMOS LDO 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 8 CM2730 300mA DUAL LOW NOISE CMOS LDO PACKAGE DIMENSION 8-PIN PTSSOP (PT08) θ θ 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 9 CM2730 300mA DUAL LOW NOISE CMOS LDO 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 2002/09/30 Preliminary Rev. 0.3 Champion Microelectronic Corporation Page 10