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| AMC7635 www.addmtek.com DESCRIPTION The AMC7635 of positive, linear regulator features low noise and low dropout voltage, making it ideal for battery applications. The space-saving SOT-23-5 package is attractive for "Pocket" and "Hand Held" applications. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground. The AMC7635 is stable with an output capacitance of 2.2F or greater. 300mA CMOS LOW DROPOUT REGULATOR FEATURES Guaranteed 300mA Output Accurate to within 1.5% Very Low Dropout Voltage Over-Temperature Shutdown Power-Saving Shutdown Mode Current Limiting Noise Reduction Bypass Capacitor Factory Pre-set Output Voltages Low Temperature Coefficient Available in SOT-23-5 packages TYPICAL APPLICATION CIRCUIT APPLICATIONS Wireless Devices VIN VIN VOUT VOUT Portable Electronics Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales Instrumentation AMC7635 CIN 1uF BP CBP 1000pF GND EN COUT 2.2uF GND VOLTAGE OPTIONS PACKAGE PIN OUT AMC7635-1.5 AMC7635-1.8 AMC7635-2.0 AMC7635-2.5 AMC7635-2.8 AMC7635-3.0 AMC7635-3.1 AMC7635-3.3 AMC7635 - 1.5V Fixed - 1.8V Fixed - 2.0V Fixed - 2.5V Fixed - 2.8V Fixed - 3.0V Fixed - 3.1V Fixed - 3.3V Fixed - Adjustable Output ORDER INFORMATION VIN GND EN 1 2 3 5 VOUT 4 BP 5-Pin Plastic SOT-23-5 Surface Mount (Top View) TA ( C ) 0 to 70 DB Plastic SOT-23-5 5-pin AMC7635-X.XDBFT (Lead Free) Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. AMC7635-X.XDBT). Note: 2. The letter "F" is marked for Lead Free process. Copyright (c) 2007 ADDtek Corp. 1 DD078_A -- SEPTEMBER 2007 AMC7635 BLOCK DIAGRAM VIN 1 Over Current Shutdown Thermal Shutdown 5 VOUT EN 3 BP 4 AMP R1 VREF R2 2 GND ABSOLUTE MAXIMUM RATINGS Input Voltage, VIN Operating Junction Temperature Range, TJ Storage Temperature Range, TSTG Lead Temperature (soldering, 10 seconds) (Note) 7V 0 C to 150 C -65C to 150C 260C Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. POWER DISSIPATION TABLE DB PACKAGE: Thermal Resistance from Junction to Ambient, JA 220/W Junction Temperature Calculation: TJ = TA + (PD xJA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. Connect the ground pin to ground using a large pad or ground plane for better heat dissipation. All of the above assume no ambient airflow. RECOMMENDED OPERATING CONDITIONS Parameter Input Voltage Load Current (with adequate heat-sinking) Junction temperature Symbol VIN IO TJ Min. VOUT +V 5 Typ. Max. 6 125 Units V mA O C Copyright (c) 2007 ADDtek Corp. 2 DD078_A -- SEPTEMBER 2007 AMC7635 ELECTRICAL CHARACTERISTICS VIN = VOUT(Nominal)0.5V, VIN,MAX = 6V, TA = 25 (unless otherwise noted) Parameter Output Voltage Accuracy Symbol VOUT VOUT VIVOUT VOUT IO = 1mA IO = 1 to 300mA IO = 1mA, VOUT + 0.5V < VIN < 6V 1mA IO 300mA VOUT(NOM) 2.0V IO=150mA, VOUT=VOUT(NOM)-2.0% Dropout Voltage V 2.0V Note 1: Note 2: Test Conditions Min Typ Max Units -1.5 -2.5 +1.5 +2.5 % Line Regulation Load Regulation 0.15 0.35 %/V 10 330 220 165 70 500 350 250 1300 900 600 300 300 400 50 100 120 600 0.1 0.5 0.01 0 2 1 0.4 VIN 60 50 40 150 C 30 dB 100 150 180 S uA A V A mA mV mV CBP = 0F, COUT = 1F, IO = 100mA IIH IIL VEN = VIN VEN = 0V VEN = GND VIL VIH VIN = 2.5 to 5.5V VIN = 2.5 to 5.5V IO=100mA CBP=0.01uF COUT=2.2uF f = 1kHz f = 10kHz f = 100kHz PSRR For the adjustable device, the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. These parameters, although guaranteed, are not tested in production. 3 DD078_A -- SEPTEMBER 2007 Copyright (c) 2007 ADDtek Corp. AMC7635 CHARACTERIZATION CURVES Unless otherwise specified, VIN = 5V, CIN = 1F, CBP = 0.01uF, COUT = 2.2F, TA = 25 OC. Chip Enable Transient Response VIN=5V, CIN=1uF, COUT=2.2uF, CBP=1000pF Enable (2V/DIV) Enable (2V/DIV) Output (1V/DIV) RLOAD=10 TIME= 1 ms/DIV Chip Enable Transient Response VIN=5V, CIN=1uF, COUT=2.2uF, CBYP=Open Output (1V/DIV) RLOAD=10 TIME= 1 ms/DIV AMC7635-3.3 AMC7635-3.3 Short Circuit Response VIN=5V, CIN=1uF, COUT=2.2uF,CBP=0.01uF RLoad =100 RShort =0.1 IO (1A/DIV) Over Temperature Shutdown VIN=5V, CIN=1uF, COUT=2.2uF,CBYP=0.01uF RLoad =6.6 IO (200mA/DIV) AMC7635-3.3 VOUT (1V/DIV) TIME= 20 ms/DIV VOUT (1V/DIV) TIME= 400 ms/DIV Load Step (1mA~300mA) VIN=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF AMC7635-3.3 VO (10mV/DIV) VIN (1V/DIV) VO (10mV/DIV) IO= 1mA ~ 300mA Line Transient Response VIN,AVE=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF IO (200mA/DIV) AMC7635-3.3 TIME= 2 ms/DIV TIME= 10 ms/DIV Copyright (c) 2007 ADDtek Corp. 4 DD078_A -- SEPTEMBER 2007 AMC7635 Ground Pin Current vs. Tem perature 62.5 Quiescent Current@ 3.5V (uA) Ground Current vs. Input Voltage 90.00 75.00 85 60 Ground Current(uA) 60.00 45.00 25 57.5 55 30.00 15.00 0.00 52.5 50 -45 -20 5 30 55 80 Temperature( ) 0.0 1.4 2.8 4.2 5.6 7.0 Input Voltage(V) Drop Out Voltage vs. Load Current 600.0 VOUT=1.5V Sofe Operating Area 400 500.0 Dropout Voltage (mV) 400.0 300.0 200.0 100.0 0.0 0 50 100 150 VOUT=2.5V , VOUT=3.1V, VOUT=2.8V , VOUT=3.3V, VOUT=3.0 VOUT=2.0V Output Current (mA) VOUT=1.8V 300 TA =70 200 TA =25 100 0 300 200 250 0 1 2 3 4 5 6 7 Load Current(mA) Input-Output Voltage Dif f erential (V) Dropout Voltage vs. Tem perature 400 Dropout Voltage @ 300mA (mV) 600.0 500.0 Drop Out Voltage vs. Output Voltage 350 Dropout Voltage(mV) 400.0 Io=300mA 300 300.0 Io=200mA 200.0 Io=100mA 250 VOUT = 3.3V I OUT = 300mA 200 -45 -20 5 30 55 80 Temperature( ) 100.0 0.0 1.5 1.8 2.0 2.5 2.8 3.0 3.1 3.3 Output Voltage(V) Copyright (c) 2007 ADDtek Corp. 5 DD078_A -- SEPTEMBER 2007 AMC7635 Pow e r Supply Re je ction Ratio 70 Io=100mA Pow e r Supply Re je ction Ratio 60 CIN=1uF 60 50 PSRR(dB) 40 30 20 CIN =1uF 50 Io=300mA COUT=2.2uF CBP=Open 40 PSRR(dB) Io=1mA Io=10mA 30 20 10 Io=100mA Io=1mA Io=10mA 10 0 100 COU T=2.2uF CBP=0.01uF Io=300mA 0 1K F reqency 10K 100K 100 1K 10K Freqency 100K 1M Pow er Supply Rejection Ratio 70 CBP=10nF CIN=1uF COUT=2.2uF Io=100mA 60 50 PSRR(dB) 40 CBP=1nF CBP=100pF 30 20 10 0 100 1K Freqency 10K 100K CBP=Open Copyright (c) 2007 ADDtek Corp. 6 DD078_A -- SEPTEMBER 2007 AMC7635 APPLICATION INFORMATION V IN V IN V OUT V OUT AMC7635 C IN 1uF BP C BP 1000pF GND EN C OUT 2.2uF GND Detailed Description The AMC7635 CMOS low dropout regulator contains a PMOS pass transistor, a voltage reference, an error amplifier, over-current protection, and thermal shutdown circuit. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. T hermal shutdown and over-current 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. External Capacitors The AMC7635 is stable with an output capacitor to ground of 2.2F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1F ceramic capacitor with a 10F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low over-all cost. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be at least 0.1F to have a beneficial effect. A third capacitor can be connected between the BP pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001 ~ 0.01F. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection. EN The EN pin is normally pulled to high. When shutdown, pulled low, the PMOS pass transistor shuts 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. Copyright (c) 2007 ADDtek Corp. 7 DD078_A -- SEPTEMBER 2007 AMC7635 PACKAGE 5-Pin SOT-23-5 D b L L1 SEATING PLANE INCHES MIN A 0.035 0.012 0.003 TYP 0.045 MAX 0.057 0.006 0.051 0.020 0.009 MILLIMETERS MIN 0.90 0.30 0.08 TYP 1.15 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 REF 0.25 BSC 15 5 10 15 0.60 MAX 1.45 0.15 1.30 0.50 0.22 E A1 E1 A2 b c e e1 M GAUGE PLANE c L2 D E E1 e e1 0.114 BSC 0.110 BSC 0.063 BSC 0.037 BSC 0.075 BSC 0.012 0.018 0.024 A A2 L L1 M 0.024 REF 0.010 BSC 5 10 A1 L2 M Copyright (c) 2007 ADDtek Corp. 8 DD078_A -- SEPTEMBER 2007 AMC7635 IMPORTANT NOTICE ADDtek 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. ADDtek 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 ADDtek 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. ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of its products to the specifications applicable at the time of sale. ADDtek Corp. 9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105 TEL: 2-25700299 FAX: 2-25700196 Copyright (c) 2007 ADDtek Corp. 9 DD078_A -- SEPTEMBER 2007 |
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