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SC4517A Dataheets PDF



Part Number SC4517A
Manufacturers Semtech Corporation
Logo Semtech Corporation
Description 1.5A Step-Down Switching Regulator
Datasheet SC4517A DatasheetSC4517A Datasheet (PDF)

1.25MHz, 1.5A Step-Down Switching Regulator POWER MANAGEMENT Description The SC4517A is a current mode switching regulator with an integrated switch, operating at 1.25MHz with separate sync & enable functions. The integrated switch allows for cost effective low power solutions (peak switch current 1.5 amps). The sync function allows customers to synchronize to a faster clock in order to avoid frequency beating in noise sensitive applications. High frequency of operation allows for very small pas.

  SC4517A   SC4517A


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1.25MHz, 1.5A Step-Down Switching Regulator POWER MANAGEMENT Description The SC4517A is a current mode switching regulator with an integrated switch, operating at 1.25MHz with separate sync & enable functions. The integrated switch allows for cost effective low power solutions (peak switch current 1.5 amps). The sync function allows customers to synchronize to a faster clock in order to avoid frequency beating in noise sensitive applications. High frequency of operation allows for very small passive components. Current mode operation allows for fast dynamic response www.DataSheet4U.com & instantaneous duty cycle adjustment as the input varies (ideal for CPE applications where the input is a wall plug power). applications where battery life is important. SC4517A Features ‹ ‹ ‹ ‹ ‹ ‹ Integrated 1.5 Amp switch 1.25MHz frequency of operation Current mode controller Synchronizable to higher frequency up to 2MHz 6µA low shutdown current MSOP-8 and MLPD-8 Lead-free packages. This product is fully WEEE and RoHS compliant Applications XDSL modems CPE equipment DC-DC point of load applications Portable equipment ‹ ‹ ‹ The low shutdown current makes it ideal for portable ‹ The SC4517A is a 1.25MHz switching regulator synchronizable to a faster frequency from 1.6MHz to 2MHz. Typical Application Circuit D1 1 VIN Enable C3 2 5 8 BST IN SW 3 6 7 C1 L1 VOUT R1 SC4517AXX EN SYNC FB COMP GND 4 D2 R2 C2 C4 R3 Revision: December 13, 2006 1 www.semtech.com SC4517A POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability. Parameter Input Supply Voltage (1) Symbol VIN (VBST - VSW) V BST V EN V FB IFB ISYNC θJ A TA TJ TSTG TLEAD TPKG ESD Limits -0.3 to +24 16 -0.3 to +32 -0.3 to +16 -0.3 to +6 1 1 185 53 -40 to +85 -40 to +150 -65 to +150 300 260 2 Units V V V V V mA mA °C/W °C °C °C °C °C kV Boost Pin Above VSW Boost Pin Voltage www.DataSheet4U.com EN Pin Voltage FB Pin Voltage FB Pin Current SYNC Pin Current Thermal Impedance Junction to Ambient (2) MSOP MLPD Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10s (MSOP) Peak IR Reflow Temperature 10-40s (MLPD) ESD Rating (Human Body Model) Notes: (1) For proper operation of device, VIN should be within maximum Operating Input Voltage as defined in Electrical Characteristics. (2) Minimum pad size. Electrical Characteristics Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open. TA = TJ = -40°C to 125°C. Parameter Operating Input Voltage (1) Symbol VIN ISW fOSC VD(SW) VUVLO IQ IQ(OFF) Conditions Min Typ Max 16 Units V A Maximum Switch Current Limit Oscillator Frequency Switch On Voltage Drop VIN Undervoltage Lockout VIN Standby Current Shutdown Current 1.5 0.9 1.25 330 2.60 VFB = VOUT(NOM) + 17% VEN = 0V, VIN = 16V, VSW = 0V 1.0 1.6 550 3 5 45 MHz mV V mA µA  2006 Semtech Corp. 2 www.semtech.com SC4517A POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open. TA = TJ = -40°C to 125°C. PARAMETER FB Input Current Feedback Voltage SYMBOL IFB CONDITIONS SC4517A (adj) SC4517A (adj), SC4517A-1.8V 3V < VIN < 16V VOUT = VFB (1) MIN TYP -0.25 MAX -0.50 1.227 1.836 2.55 3.366 5.1 21.0 30.0 39.0 60.0 UNITS µA 1.173 1.764 2.45 3.234 4.9 10.5 14.7 19.0 29.0 150 500 1.2 1.8 2.5 3.3 5 15.0 21.0 27.5 42.0 350 850 120 110 2.5 SC4517A-2.5V SC4517A-3.3V SC4517A-5V V www.DataSheet4U.com FB Input Resistance RFB SC4517A-1.8V SC4517A-2.5V SC4517A-3.3V SC4517A-5V kΩ FB to VCOMP Voltage Gain(2) FB to VCOMP Transconductance(2) VCOMP Pin Source Current VCOMP Pin Sink Current VCOMP Pin to Switch Current Transconductance VCOMP Pin Maximum Switching Threshold VCOMP Pin Threshold Maximum Switch Duty Cycle Minimum Boost Voltage Above Switch Boost Current 0.4V ≤ VCOMP ≤ 0.9V ∆ ICOMP = ± 10µA VFB = VOUT(NOM) - 17% VFB = VOUT(NOM) + 17% 1300 160 180 µMho µA µA A/V V V % Duty cycle = 0% ISW = 1.5A VCOMP = 1.2V, ISW = 400mA ISW = 1.5A, 0°C ≤ TA ≤ 125°C and ISW = 1.3A, TA < 0°C ISW = 0.5A ISW = 1.5A, 0°C ≤ TA ≤ 125°C and ISW = 1.3A, TA < 0°C 80 0.35 0.9 90 1.8 10 30 2.7 15 45 V mA  2006 Semtech Corp. 3 www.semtech.com SC4517A POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open. TA = TJ = -40°C to 125°C. PARAMETER Enable Input Threshold Voltage SYMBOL VIH VIL CONDITIONS MIN 2 TYP MAX UNITS V 0.4 -10 EN = 100mV below threshold 7 1.5 1.6 VSYNC = 0.5V 20 2 15 V µA µA V MHz kΩ Enable Input Bias Current www.DataSheet4U.com IIL IIH SYNC Threshol.


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