AMC7635 300mA CMOS LOW DROPOUT REGULATOR www.addmtek.com DESCRIPTION FEATURES 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. Guaranteed 300mA Output Accurate to within 1.5% Very Low Dropout Voltage Over-Temperature Shutdown In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground. Power-Saving Shutdown Mode Current Limiting The AMC7635 is stable with an output capacitance of 2.2µF or greater. Noise Reduction Bypass Capacitor Factory Pre-set Output Voltages Low Temperature Coefficient Available in SOT-23-5 packages TYPICAL APPLICATION CIRCUIT VIN VIN APPLICATIONS VOUT VOUT AMC7635 CIN BP GND EN COUT 2.2uF 1uF CBP 1000pF GND Wireless Devices Portable Electronics Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales Instrumentation VOLTAGE OPTIONS 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 PACKAGE PIN OUT – 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 VIN 1 GND 2 EN 3 5 VOUT 4 BP 5-Pin Plastic SOT-23-5 Surface Mount (Top View) ORDER INFORMATION 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 © 2007 ADDtek Corp. 1 DD078_A -- SEPTEMBER 2007 AMC7635 BLOCK DIAGRAM 5 VOUT VIN 1 Over Current Shutdown Thermal Shutdown EN 3 BP 4 － AMP ＋ R1 VREF R2 2 ABSOLUTE MAXIMUM RATINGS GND (Note) 7V 0 °C to 150 °C -65°C to 150°C 260°C Input Voltage, VIN Operating Junction Temperature Range, TJ Storage Temperature Range, TSTG Lead Temperature (soldering, 10 seconds) 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, θJA 220℃/W Junction Temperature Calculation: TJ = TA + (PD ×θJA). The θJA 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 Symbol Min. VIN IO TJ VOUT +∆V 5 Input Voltage Load Current (with adequate heat-sinking) Junction temperature Copyright © 2007 ADDtek Corp. 2 Typ. Max. Units 6 V mA O C 125 DD078_A -- SEPTEMBER 2007 AMC7635 ELECTRICAL CHARACTERISTICS VIN = VOUT(Nominal)＋0.5V, VIN,MAX = 6V, TA = 25℃ (unless otherwise noted) Parameter Output Voltage Accuracy Line Regulation Load Regulation Symbol VOUT ∆VOUT ∆VIVOUT ∆VOUT Test Conditions IO = 1mA -1.5 +1.5 IO = 1 to 300mA -2.5 +2.5 IO = 1mA, VOUT + 0.5V < VIN < 6V ∆V 10 70 VOUT(NOM) ≤ 2.0V 330 500 2.0V<VOUT(NOM)≤2.5V 220 350 VOUT(NOM) > 2.5V 165 250 VOUT ≤ 2.0V 1300 IO=300mA, VOUT＝VOUT(NOM)-2.0% 2.0V<VOUT≤2.5V VOUT > 2.5V Maximum Output Current Current Limit Ground Pin Current IO ILIMIT IQ Output Shutdown Delay VOUT > 0.96 × VRATING 300 VOUT > 1.2V 300 mA 400 IO = 0mA ~ 10mA 50 100 IO = 10mA ~ 150mA 100 150 IO = 150mA ~ 300mA 120 180 CBP = 0µF, COUT = 1µF, IO = 100mA 600 0.1 EN “low” Bias Current IIL VEN = 0V 0.5 VEN = GND 0.01 1 EN “low” Input Threshold VIL VIN = 2.5 to 5.5V 0 0.4 EN “high” Input Threshold VIH VIN = 2.5 to 5.5V 2 VIN PSRR f = 1kHz 60 f = 10kHz 50 f = 100kHz 40 Thermal Protection Temperature uA µA V dB 150 °C Thermal Protection Temperature Hysteresis 30 Note 1: 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. Note 2: These parameters, although guaranteed, are not tested in production. Copyright © 2007 ADDtek Corp. µA µS VEN = VIN IO=100mA CBP=0.01uF COUT=2.2uF mV 600 IIH Power Supply Rejection Ratio mV 900 EN “high” Bias Current Shutdown Supply Current % 0.15 0.35 %/V 1mA ≤ IO ≤ 300mA IO=150mA, VOUT=VOUT(NOM)-2.0% Dropout Voltage Min Typ Max Units 3 DD078_A -- SEPTEMBER 2007 AMC7635 CHARACTERIZATION CURVES Unless otherwise specified, VIN = 5V, CIN = 1µF, CBP = 0.01uF, COUT = 2.2µF, TA = 25 OC. VIN=5V, CIN=1uF, COUT=2.2uF, CBYP=Open RLOAD=10Ω Output (1V/DIV) Output (1V/DIV) Enable (2V/DIV) Chip Enable Transient Response VIN=5V, CIN=1uF, COUT=2.2uF, CBP=1000pF Enable (2V/DIV) Chip Enable Transient Response AMC7635-3.3 RLOAD=10Ω AMC7635-3.3 TIME= 1 ms/DIV TIME= 1 ms/DIV Short Circuit Response Over Temperature Shutdown VIN=5V, CIN=1uF, COUT=2.2uF,CBP=0.01uF VIN=5V, CIN=1uF, COUT=2.2uF,CBYP=0.01uF RLoad =100Ω RShort =0.1Ω RLoad =6.6Ω VOUT (1V/DIV) VOUT (1V/DIV) IO (1A/DIV) IO (200mA/DIV) AMC7635-3.3 TIME= 20 ms/DIV TIME= 400 ms/DIV Load Step (1mA~300mA) Line Transient Response VIN=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF VIN,AVE=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF VIN (1V/DIV) IO= 1mA ~ 300mA VO (10mV/DIV) IO (200mA/DIV) VO (10mV/DIV) AMC7635-3.3 TIME= 10 ms/DIV Copyright © 2007 ADDtek Corp. AMC7635-3.3 TIME= 2 ms/DIV 4 DD078_A -- SEPTEMBER 2007 AMC7635 Ground Current vs. Input Voltage Ground Pin Current vs. Tem perature 90.00 75.00 60 85℃ Ground Current(uA) Quiescent Current@ 3.5V (uA) 62.5 57.5 55 52.5 60.00 45.00 25℃ 30.00 15.00 50 0.00 -45 -20 5 30 55 0.0 80 1.4 2.8 4.2 5.6 7.0 Input Voltage(V) Temperature(℃ ) Sofe Operating Area Drop Out Voltage vs. Load Current 400 600.0 VOUT=1.5V VOUT=1.8V Output Current (mA) Dropout Voltage (mV) 500.0 VOUT=2.0V 400.0 300.0 200.0 100.0 VOUT=2.5V , VOUT=3.1V, VOUT=2.8V , VOUT=3.3V, VOUT=3.0 0.0 0 50 100 150 200 250 300 TA =70℃ 200 TA =25℃ 100 0 300 0 1 Dropout Voltage vs. Tem perature 3 4 5 6 7 Drop Out Voltage vs. Output Voltage 600.0 400 500.0 Dropout Voltage(mV) Dropout Voltage @ 300mA (mV) 2 Input-Output Voltage Dif f erential (V) Load Current(mA) 350 300 250 400.0 Io=300mA 300.0 Io=200mA 200.0 Io=100mA 100.0 VOUT = 3.3V I OUT = 300mA 0.0 200 -45 -20 5 30 55 1.5 80 Temperature(℃ ) Copyright © 2007 ADDtek Corp. 1.8 2.0 2.5 2.8 3.0 3.1 3.3 Output Voltage(V) 5 DD078_A -- SEPTEMBER 2007 AMC7635 Pow e r Supply Re je ction Ratio Pow e r Supply Re je ction Ratio 70 60 Io=100mA CIN =1uF 60 COU T=2.2uF 50 CBP=Open Io=300mA 40 40 PSRR(dB) PSRR(dB) 50 Io=1mA Io=10mA 30 30 Io=1mA Io=100mA Io=10mA 20 20 C IN =1uF 10 C OU T=2.2uF 10 C BP=0.01uF Io=300mA 0 0 100 1K 10K 100 100K 1K 10K 100K 1M Freqency F reqency Pow er Supply Rejection Ratio 70 CIN =1uF CBP=10nF COUT=2.2uF 60 Io=100mA PSRR(dB) 50 CBP=1nF 40 CBP=100pF 30 20 10 CBP=Open 0 100 1K 10K 100K Freqency Copyright © 2007 ADDtek Corp. 6 DD078_A -- SEPTEMBER 2007 AMC7635 APPLICATION INFORMATION V IN V IN V OUT V OUT AMC7635 C IN BP GND EN C OUT 2.2uF 1uF C BP 1000pF 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 2.2µF 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 0.1µF ceramic capacitor with a 10µF 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 0.1µF 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 ~ 0.01µF. 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 1µA. This pin behaves much like an electronic switch. Copyright © 2007 ADDtek Corp. 7 DD078_A -- SEPTEMBER 2007 AMC7635 PACKAGE 5-Pin SOT-23-5 SEATING PLANE D INCHES b L E MIN L1 TYP MAX MIN TYP MAX A - - 0.057 - - 1.45 A1 - - 0.006 - - 0.15 A2 0.035 0.045 0.051 0.90 1.15 1.30 b 0.012 - 0.020 0.30 - 0.50 c 0.003 - 0.009 0.08 - 0.22 E1 c e L2 e1 M GAUGE PLANE D 0.110 BSC 2.80 BSC 0.063 BSC 1.60 BSC e 0.037 BSC 0.95 BSC 0.075 BSC 0.012 L1 A1 M 8 0.018 1.90 BSC 0.024 0.30 0.024 REF L2 °M Copyright © 2007 ADDtek Corp. 2.90 BSC E L A2 0.114 BSC E1 e1 A MILLIMETERS 10° 0.60 0.60 REF 0.010 BSC 5° 0.45 0.25 BSC 15° 5° DD078_A 10° 15° -- 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 © 2007 ADDtek Corp. 9 DD078_A -- SEPTEMBER 2007