Product is End of Life 3/2014 Si9145 Vishay Siliconix Low-Voltage Switchmode Controller DESCRIPTION FEATURES The Si9145 switchmode controller IC is ideally suited for high efficiency dc/dc converters in low input voltage systems. Operation is guaranteed down to 2.7 V, with a minimum start-up voltage of 3.0 V making the Si9145 ideal for use with NiCd, NMH, and lithium ion battery packs. A mode select pin allows the output driver polarity to be programmed allowing the device to function as a step-up or step-down converter. * * * * * * Features include a precision bandgap reference, a wide bandwidth error amplifier, a 2 MHz oscillator, an input voltage monitor with standby mode and a 200 mA output driver. * 0 - 100 % Controllable Maximum Duty-Cycle 2.7 V to 7 V Input Operating Range Voltage-Mode PWM Control High-Speed, Source-Sink Output Drive (200 mA) Internal Oscillator (up to 2 MHz) Standby Mode 0 - 100 % Controllable Maximum Duty-Cycle 2.7 V to 7 V Input Operating Range Supply current in normal operation is typically 1.1 mA and 250 A in standby mode. The Si9145 implements conventional voltage mode control. The maximum duty cycle in boost mode can be limited by voltage on DMAX/SS pin. Frequency can be externally programmed by selection of ROSC and COSC. The Si9145 is available in both standard and lead (Pb)-free 16pin SOIC and TSSOP packages and is specified over the industrial temperature range (- 25 C to 85 C). FUNCTIONAL BLOCK DIAGRAM 1.5 V Reference Generator VDD VREF UVLO UVLOSET Temp Sense VUVLO S OTS ENABLE R MODE SELECT VS DMAX/SS + COMP Logic Control Error Amp NI + FB - OUTPUT PGND + - COSC Driver GND Oscillator ROSC PentiumTM is a trademark of Intel Corporation. PowerPCTM is a trademark of IBM. Document Number: 70021 S-40710-Rev. K, 19-Apr-04 www.vishay.com 1 Product is End of Life 3/2014 Si9145 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Parameter Voltages Referenced to GND VDD, VS PGND VDD to VS Linear Inputs Logic Inputs Continuous Output Current Storage Temperature Operating Junction Temperature Limit 8 0.3 - 0.3 - 0.3 V to VDD to + 0.3 - 0.3 V to VDD to + 0.3 100 - 65 to 125 150 900 925 140 135 16-Pin SOIC (Y Suffix)b 16-Pin TSSOP (Q Suffix)c 16-Pin SOIC 16-Pin TSSOP Power Dissipation (Package)a Thermal Impedance (JA) Unit V mA C mW C/W Notes: a. Device Mounted with all leads soldered or welded to PC board. b. Derate 7.2 mW/C above 25 C. c. Derate 7.4 mW/C above 25 C. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE Parameter Voltages Referenced to GND VDD VS fOSC ROSC COSC Linear Inputs Digital Inputs VREF Load Resistance Limit Unit 2.7 V to 7 V 2.7 V to 7 V 2 kHz to 2 MHz 5 k to 250 k 47 pF to 200 pF 0 to VDD 0 to VDD > 150 V k pF k SPECIFICATIONS Parameter Symbol Test Conditions Unless Otherwise Specifieda 2.7 V VDD 7 V, VDD = VS GND = PGND Limits B Suffix - 25 to 85 C Minb Typ Maxb 1.455 1.477 1.50 1.545 1.523 1.0 1.15 Unit Reference Output Voltage VREF IREF = - 10 A TA = 25 C V Oscillator Maximum Frequencyc fMAX Accuracy fOSC ROSC Voltage Minimum Start-Up Voltage 50 % DMAX/SS 100 % DMAX/SS DMAX/SS Input Current Voltage Stabilityc Temperature Stabilityc www.vishay.com 2 VROSC VDDOSC VDMAX 50 % VDMAX 100 % IDMAX f/f VCC = 3.0 V, COSC = 47 pF, ROSC = 5.0 k VCC = 3.0 V TA = 25 C COSC = 100 pF, ROSC = 6.98 k 2.0 0.85 MHz 1.0 3.0 DMAX = 0 to VDD 2.7 V VDD 7 V, Ref to 4.8 V 2.7 V VDD 4.2 V, Ref to 3.5 V TA = 25 C 3.8 V VDD 5.6 V, Ref to 4.7 V Referenced to 25 C V 1.30 1.58 MODE SELECT = VDD - 100 - 16 -8 -7 100 16 8 7 nA % 5 Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Product is End of Life 3/2014 Si9145 Vishay Siliconix SPECIFICATIONS Test Conditions Parameter Symbol Unless Otherwise Specifieda 2.7 V VDD 7 V, VDD = VS GND = PGND Limits B Suffix - 25 to 85 C Unit Minb Typ Maxb Error Amplifier (COSC = GND, OSC DISABLED) Input BIAS Current IFB Open Loop Voltage Gain AVOL Offset Voltage VOS Unity Gain Bandwidthc BW Output Current IEA VNI = VREF, VFB = 1.0 V - 1.0 47 VNI = VREF - 15 0 Source (VFB = 1 V, NI = VREF) Sink (VFB = 2 V, NI = VREF) - 2.0 0.4 2.7 V < VDD < 7.0 V VUVLOHL UVLOSET High to Low VUVLOLH UVLOSET Low to High Hysteresis VHYS VUVLOLH - VUVLOHL UVLO Input Current IUVLO VUVLO = 0 to VDD - 100 Output High Voltage VOH VDD = 2.7 V, IOUT = - 10 mA 2.55 Output Low Voltage VOL VDD = 2.7 V, IOUT = 10 mA Peak Output Current ISOURCE VDD = 2.7 V, VOUT = 0 V Peak Output Current ISINK VDD = 2.7 V, VOUT = 2.7 V ENABLE Delay to Output tdEN ENABLE Rising to OUTPUT ENABLE Logic Low VENL ENABLE Logic High VENH A dB 15 10 PSRR Power Supply Rejectionc 1.0 55 mV MHz - 1.0 0.8 60 mA dB UVLOSET Voltage Monitor Under Voltage Lockout 0.85 1.0 1.15 1.2 200 V mV 100 nA Output 150 2.60 0.06 0.15 - 180 - 130 200 V mA Logic ENABLE Input Current IEN MODE SELECT Logic Low VMODEL MODE SELECT Logic High VMODEH MODE SELECT Input Current IMODE s 1.5 0.2 VDD 0.8 VDD ENABLE = 0 to VDD - 1.0 1.0 0.2 VDD 0.8 VDD MODE SELECT = 0 to VDD - 1.0 1.0 V A V A Over Temperature Sense Trip Point TTRIP 150 Output Low Voltage VOTSL VDD = 2.7 V, IOUT = 1 A Output High Voltage VOTSH VDD = 2.7 V, IOUT = - 1 A 0.06 2.55 C 0.15 2.6 V Supply Supply Current - Normal Mode IDD VDD = 2.7 V, fOSC = 1 MHz, ROSC = 6.98 k 1.1 1.5 VDD = 7 V, fOSC = 1 MHz, ROSC = 6.98 k 1.6 2.3 mA Supply Current - Standby Mode ENABLE = Low 250 330 A Notes: a. CSTRAY < 5 pF on COSC. After Start-Up, VDD of 3 V. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. c. Guaranteed by design, not subject to production testing. Document Number: 70021 S-40710-Rev. K, 19-Apr-04 www.vishay.com 3 Product is End of Life 3/2014 Si9145 Vishay Siliconix TYPICAL CHARACTERISTICS 1.515 1.515 VDD = 3.6 V 1.510 1.510 1.505 1.505 V REF (V) V REF (V) VREF with 10 A Load 1.500 1.500 1.495 1.495 1.490 1.490 1.485 - 25 1.485 2 3 4 5 6 7 8 0 25 50 75 100 125 t - Temperature (C) VDD - Supply Voltage (V) VREF vs. Temperature VREF vs. Supply Voltage 1.515 80 1.510 60 0 Gain - 30 Gain (dB) 40 2.7, 3.0, 3.6 V 1.500 7.0 V 5.0 V 1.495 1.490 Phase 20 - 60 0 - 90 - 120 - 20 1.485 - 150 - 40 0 5 10 15 20 25 30 Phase (deg) V REF (V) 1.505 0.0001 0.001 0.01 VREF - Sourcing Current (A) 0.1 1 10 100 f - Frequency (MHz) VREF vs. Load Current Error Amplifier Gain and Phase 25 25 f = 1 MHz VDD = 3.6 V CL = 2,200 pF 20 20 Supply Current (mA) Supply Current (mA) CL = 2,200 pF 15 900 pF 10 100 pF 15 900 pF 10 100 pF 5 5 10 pF 10 pF 0 2 3 4 5 6 VDD - Supply Voltage (V) Supply Current vs. Supply Voltage and Output Load www.vishay.com 4 7 0 0.5 1.0 1.5 2.0 Switching Frequency (MHz) Supply Current vs. Switching Frequency and Output Load Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Product is End of Life 3/2014 Si9145 Vishay Siliconix TYPICAL CHARACTERISTICS 1.9 5 CL = 10 pF CL = 10 pF f = 1 MHz VDD = 7.0 V 1.7 Normal Current (mA) Supply Current (mA) 4 5.0 V 3 2 1.5 TA = 85 C 1.3 25 C - 25 C 3.6 V 1.1 2.7 V 3.0 V 0.2 0.4 0.6 0.8 0.9 2.5 1.0 4.5 5.5 6.5 7.5 VDD - Supply Voltage (V) Supply Current vs. Frequency and Supply Voltage Supply Current vs. Supply Voltage and Temperature 270 100 260 80 TA = 85 C 250 25 C 240 60 40 - 25 C 230 20 220 2 3 4 5 6 0 1.0 7 1.1 1.2 1.3 1.4 1.5 VDD - Supply Voltage (V) DMAX/SS (V) Standby Current vs. Supply Voltage and Temperature Duty Cycle vs. DMAX/SS Voltage 1.6 10.00 1.20 ROSC = 6.98 k COSC = 100 pF Switching Frequency (MHz) 1.15 Switching Frequency (MHz) 3.5 f - Frequency (MHz) Duty Cycle (%) Standby Current (A) 1 0.0 1.10 1.05 1.00 1.00 4.99 k 12.1 k 24.9 k 0.10 49.9 k 100 k 0.95 249 k 0.01 0.90 2 3 4 5 6 VDD - Supply Voltage (V) Switching Frequency vs. Supply Voltage Document Number: 70021 S-40710-Rev. K, 19-Apr-04 7 40 100 200 300 COSC - Capacitance (pF) Frequency vs. ROSC/COSC www.vishay.com 5 Product is End of Life 3/2014 Si9145 Vishay Siliconix TYPICAL CHARACTERISTICS 50 50 CL = 2,200 pF Fall Time (nS) Output Rise Time (nS) CL = 2,200 pF 40 40 30 900 pF 20 100 pF 10 30 900 pF 20 10 100 pF 10 pF 10 pF 0 0 2 3 4 5 6 2 7 3 4 5 6 7 VDD - Supply Voltage (V) VDD - Supply Voltage (V) Output Fall Time vs. Supply Voltage and Load Output Rise Time vs. Supply Voltage and Load 250 50 230 UVLO Hysteresis (mV) Output Delay (nS) 40 Mode Select = High 30 Mode Select = Low 20 210 190 170 150 10 2 3 4 5 6 7 2 3 4 5 6 7 VDD - Supply Voltage (V) VDD - Supply Voltage (V) UVLO Hysteresis vs. Supply Voltage Enable Delay to Output 1.515 VDD = 3.6 V 1.510 V REF (V) 1.505 1.500 1.495 1.490 1.485 0 2 4 6 8 10 Capacitance (mF) VREF vs. Bypass Capacitor www.vishay.com 6 Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Product is End of Life 3/2014 Si9145 Vishay Siliconix TIMING WAVEFORMS Start-Up (UVLO) Normal (Duty Cycle Limit) Standby ENABLE MODE SELECT 1.2 V UVLOSET 1.0 V 1.0 V ROSC COSC ON OUTPUT OFF > 1.5 V Set for 50 % Max. DMAX/SS Figure 1. Si9145 Timing Diagram (MODE SELECT = High) Start-Up (UVLO) Normal (Duty Cycle Limit) Standby ENABLE MODE SELECT 1.2 V UVLOSET 1.0 V 1.0 V ROSC COSC OFF OUTPUT ON DMAX/SS Figure 2. Si9145 Timing Diagram (MODE SELECT = Low) Document Number: 70021 S-40710-Rev. K, 19-Apr-04 www.vishay.com 7 Product is End of Life 3/2014 Si9145 Vishay Siliconix PIN CONFIGURATIONS SOIC-16 VDD 1 16 VS MODE SELECT 2 15 OUTPUT DMAX/SS 3 14 PGND COMP 4 13 UVLOSET FB 5 12 ENABLE NI 6 VREF 7 10 COSC 8 9 ROSC GND 11 TSSOP-16 VDD 1 16 MODE SELECT 2 15 OUTPUT DMAX/SS 3 14 PGND COMP 4 13 UVLOSET FB 5 12 ENABLE NI 6 11 OTS VREF 7 10 COSC GND 8 9 ROSC OTS VS Top View Top View ORDERING INFORMATION - SOIC-16 Part Number Si9145BY-T1 Si9145BY-T1-E3 Temperature Range - 25 to 85 C ORDERING INFORMATION - TSSOP-16 Part Number Si9145BQ-T1 Si9145BQ-T1-E3 Temperature Range - 25 to 85 C PIN DESCRIPTION Pin 1: VDD The positive power supply for all functional blocks except output driver. A bypass capacitor of 0.1 F (minimum) is recommended. Pin 2: MODE SELECT This pin is used to enable maximum duty cycle limit and set output polarity of controller. When connected to VDD, the maximum duty cycle function is controlled by the DMAX/SS pin. The maximum duty cycle limit is usually used for forward, flyback, and boost converters. The output polarity is high when the PWM circuitry requires the external device to be turned on. When connected to GND, the maximum duty cycle is not limited (usually for buck converters driving a P-Channel MOS). The output polarity is low when the PWM circuitry requires the external PMOS to be turned on. The addition of external components can implement a soft start function. Pin 4: COMP This pin is the output of the error amplifier. A compensation network is connected from this pin to the FB pin to stabilize the system. This pin drives one input of the internal pulse width modulation comparator. Pin 5: FB The inverting input of the error amplifier. External resistors are connected to this pin to set the regulated output voltage. The compensation network is also connected to this pin. Pin 6: NI The non-inverting input of the error amplifier. In normal operation it is externally connected to the VREF pin. Pin 3: DMAX/SS Pin 7: VREF DMAX/SS pin controls the maximum duty cycle achievable by the PWM circuitry when the MODE SELECT = VDD. When DMAX/SS is at less than 1.0 V (typical) the OUTPUT is held low (0 % duty cycle). When DMAX/SS is at more than 1.5 V (typical), the PWM circuitry can achieve 100 % duty cycle. With voltage at DMAX/SS between 1.0 V and 1.5 V, the maximum duty cycle is proportionally limited to this voltage. This pin supplies 1.5 V trimmed to 1.5 %. The reference voltage is generated by a band-gap reference. www.vishay.com 8 Pin 8: GND Negative return for VDD. Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Product is End of Life 3/2014 Si9145 Vishay Siliconix Pin 9: ROSC Pin 12: ENABLE This pin is the equivalent of a 1.0 V voltage source derived from the on-chip VREF. When a low T.C. resistor is externally connected from this pin to GND, a temperature independent current is generated internally. This current is used as the charging current source connected to the COSC pin. The current is internally multiplied by 2 and is used as the discharging current source connected to the COSC pin. Therefore, the external resistor is one of the factors that determine the oscillator frequency. A logic high on this pin allows normal operation. A logic low places the chip in the standby mode. In standby mode normal operation is disabled, supply current is reduced, the oscillator stops and the output is held high for MODE SELECT = low, and low for MODE SELECT = high. Pin 10: COSC An external capacitor is connected to this pin to set the oscillator frequency. Internal current sources alternately charge and discharge the external capacitor. The oscillator waveform is a symmetrical triangular type with a typical voltage swing between 1.0 V and 1.5 V. 0.7 fOSC ROSC COSC Pin 11: OTS This pin indicates an over-temperature condition on the device when the output is low. The output is latched low and is reset with the ENABLE pin going low then high, or by turning power off and on. Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Pin 13: UVLOSET This pin will place the chip in the standby mode if the UVLOSET voltage drops below 1.2 V. Once the UVLOSET voltage exceeds 1.2 V, the chip operates normally. There is a built-in hysteresis of 200 mV. Pin 14: PGND The negative return for the VS supply. Pin 15: OUTPUT This CMOS push-pull output pin drives the external MOSFET and is capable of sinking 150 mA or sourcing 130 mA with VS equal to 2.7 V. Pin 16: VS The positive terminal of the power supply which powers the CMOS output driver. A bypass capacitor is required. www.vishay.com 9 Product is End of Life 3/2014 Si9145 Vishay Siliconix APPLICATIONS L1 D1 VOUT Q1 VDD C1 C2 Si9145 2.7 V - 7 V 0V Figure 3. Non-Isolated Step Up Boost Converter for VOUT > VIN L1 Q1 VOUT VDD C1 C2 Si9145 2.7 V - 7 V D1 0V Figure 4. Non-Isolated Step Down Buck Converter for VOUT < VIN Q1 VDD C1 L1 2.7 V - 7 V Si9145 VOUT Q2 C2 0V Figure 5. Non-Isolated Synchronous Buck Converter for VOUT < VIN Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?70021. www.vishay.com 10 Document Number: 70021 S-40710-Rev. K, 19-Apr-04 Package Information Vishay Siliconix SOIC (NARROW): 16-LEAD (POWER IC ONLY) JEDEC Part Number: MS-012 MILLIMETERS 16 15 14 13 12 11 10 Dim A A1 B C D E e H L 9 E 1 2 3 4 5 6 7 8 INCHES Min Max Min Max 1.35 1.75 0.053 0.069 0.10 0.20 0.004 0.008 0.38 0.51 0.015 0.020 0.18 0.23 0.007 0.009 9.80 10.00 0.385 0.393 3.80 4.00 0.149 0.157 1.27 BSC 0.050 BSC 5.80 6.20 0.228 0.244 0.50 0.93 0.020 0.037 0_ 8_ 0_ 8_ ECN: S-40080--Rev. A, 02-Feb-04 DWG: 5912 H D C All Leads e Document Number: 72807 28-Jan-04 B A1 L 0.101 mm 0.004 IN www.vishay.com 1 Package Information Vishay Siliconix TSSOP: 16-LEAD DIMENSIONS IN MILLIMETERS Symbols Min Nom Max A - 1.10 1.20 A1 0.05 0.10 0.15 A2 - 1.00 1.05 0.38 B 0.22 0.28 C - 0.127 - D 4.90 5.00 5.10 E 6.10 6.40 6.70 E1 4.30 4.40 4.50 e - 0.65 - L 0.50 0.60 0.70 L1 0.90 1.00 1.10 y - - 0.10 1 0 3 6 ECN: S-61920-Rev. D, 23-Oct-06 DWG: 5624 Document Number: 74417 23-Oct-06 www.vishay.com 1 PAD Pattern www.vishay.com Vishay Siliconix RECOMMENDED MINIMUM PAD FOR TSSOP-16 0.193 (4.90) 0.171 0.014 0.026 0.012 (0.35) (0.65) (0.30) (4.35) (7.15) 0.281 0.055 (1.40) Recommended Minimum Pads Dimensions in inches (mm) Revision: 02-Sep-11 1 Document Number: 63550 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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We confirm that all the products identified as being compliant to IEC 61249-2-21 conform to JEDEC JS709A standards. Revision: 02-Oct-12 1 Document Number: 91000