TS3300 0.6-3VIN, 1.8-3.6VOUT, 3.5µA, High-Efficiency Boost + Output Load Switch FEATURES DESCRIPTION The TS3300 is a 1st-generation power management product that combines a high-efficiency boost regulator and an output load switch in one package. The boost regulator operates from a supply voltage as low as 0.6V and can deliver at least 75mA at 1.2VBI to 3VBO, an industry first. Combines Low-power Boost + Output Load Switch Boost Regulator Input Voltage: 0.6V- 3V Output Voltage: 1.8V- 3.6V Efficiency: Up to 84% No-load Input Current: 3.5µA Delivers >100mA at 1.8VBO from 1.2VBI Boost Shutdown Control No External Schottky Diode Required Anti-Crush Capability Prevents Input Voltage Collapse when powered with Weak/High Impedance Power Sources Single-Inductor, Discontinuous Conduction Mode Scheme with Automatic Peak Current Adjustment 16-Pin, Low-Profile, Thermally-Enhanced 3mm x 3mm TQFN Package APPLICATIONS Coin Cell-Powered Portable Equipment Single Cell Li-ion or Alkaline Powered Equipment Solar or Mechanical Energy Harvesting Wireless Microphones Wireless Remote Sensors RFID Tags Blood Glucose Meters Personal Health-Monitoring Devices The TS3300 includes an anti-crushTM feature to prevent the collapse of the input voltage to the boost regulator when the input is a weak (high impedance) source. If the input voltage drops below a determined voltage threshold (settable by a resistor divider), the boost regulator switching cycles are paused, effectively limiting the minimum input voltage. AnticrushTM is useful in applications where a buffer capacitor at the boost’s output can service burst loads, and the input source exhibits substantial source impedance (such as an old battery, or at cold temperatures). The TS3300 is fully specified over the -40°C to +85°C temperature range and is available in a low-profile, thermally-enhanced 16-pin 3x3mm TQFN package with an exposed back-side paddle. For best performance, solder the exposed back-side paddle to PCB ground. TYPICAL APPLICATION CIRCUIT Efficiency vs Output Load Current 100 90 1.2VBI to 1.8VBO EFFICIENCY - % 80 70 60 50 1.2VBI to 3VBO 40 30 20 10 L: LPS4018-103ML 0 1 0.01 0.1 IBO - mA 10 100 Page 1 © 2014 Silicon Laboratories, Inc. All rights reserved. TS3300 ABSOLUTE MAXIMUM RATINGS BI to GND ................................................................. -0.3V to VBO +0.1V CCP................................................................................ -0.3V to +2.5V BEN to GND ............................................................... -0.3V to VBI+0.3V BI FB, BO FB to GND ...............................................-0.3V to VBO+0.3V SW EN, REG EN, REG FB, REG OUT to GND .... -0.3V to VREGIN+0.3V BO, REG IN to GND..................................................... -0.3V to +5.75V LSW to GND ................................................................ -0.3V to +5.75V Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN (Derate at 17.5mW/°C above +70°C) ..... 1398mW Operating Temperature Range ................................. -40°C to +85°C Storage Temperature Range .................................. -65°C to +150°C Lead Temperature (Soldering, 10s)...................................... +300°C Electrical and thermal 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 condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime. PACKAGE/ORDERING INFORMATION ORDER NUMBER PART CARRIER QUANTITY MARKING TS3300ITQ1633 Tape & Reel ----- Tape & Reel 3000 3300I TS3300ITQ1633T Lead-free Program: Silicon Labs supplies only lead-free packaging. Consult Silicon Labs for products specified with wider operating temperature ranges. Page 2 TS3300 Rev. 1.0 TS3300 ELECTRICAL CHARACTERISTICS VBI = 1.2V, VBO = 3V, VBEN = GND, IBO= 20mA, L = 10µH, CBI=CBO = 22µF unless otherwise noted. Values are at TA = -40°C to +85°C unless otherwise specified. Typical values are at TA=+25°C unless otherwise specified. Please see Note 1. PARAMETER Minimum Input Boost Voltage Maximum Input Boost Voltage Output Boost Voltage Range SYMBOL CONDITIONS VBI_MIN IBO = 0mA. TA=25ºC VBI_MAX Guaranteed by design Output Load-Switch Supply Current Boost Shutdown Supply Current Boost Feedback Voltage during operation Anti-Crush Feedback Voltage Anti-Crush Feedback Voltage Hysteresis Inductor Peak Current Inductor Valley Current NMOS On Resistance PMOS LOAD SWITCH Boost Enable Threshold IQ IREGIN ISHUTDOWN TYP MAX UNITS 0.6 0.75 V 3 V 1.8 VBO @ BO @ BI @ BO @ BI 3.5 0.07 @ BI 10.8 IREGOUT = 0mA, VREG EN = VREGIN 0.4 See Note 2. No-Load Input Current MIN -40°C<TA<+85°C See Note 2. Active-Mode See Note 3. VBEN = VBI TA =25°C @ BI 3.6 V 6 0.9 µA 1 µA 100 nA VBO FB Output voltage accuracy: ±4% 0.489 0.505 0.521 V VBI FB VBI ≥ 0.6V 0.363 0.392 0.425 V VBI FB_HYST IPK IV RON NMOS RON PMOS RON LOAD SWITCH VBEN IBO=0mA 50 mV 10 mA mA 365 0.27 Ω 0.48 Measured from REGIN to REGOUT. See Note 4. VIL VIH 0.9 1.2 0.2 VBI - 0.05 V V mV VBEN_HYST 200 Boost Enable Hysteresis 0.2 x VREGIN VIL (CMOS logic) Output Load Switch V VREG EN Enable Threshold VIH (CMOS logic) 0.8 x VREGIN Output Load Switch 100 mV VREG EN_HYST Enable Hysteresis BO FB Input Leakage ±0.1 ±1 IBO FB Current REGEN Input Leakage 10 IREG EN nA Current REGFB Input Leakage ±0.1 ±1 IREG FB Current Note 1: All devices are 100% production tested at TA=+25°C and are guaranteed by characterization for TA=-40°C to +85°C, as specified. Note 2: IBO=0mA, VBO FB=0.6V. Note 3: Boost Only Circuit configuration. IBO=0mA. VBI FB=VBI. VBI=1.2V. VBO=3V. Note 4: VSW EN=VREGIN=VBO. VREG EN=GND. TS3300 Rev. 1.0 Page 3 TS3300 TYPICAL PERFORMANCE CHARACTERISTICS VBI = 1.2V, VBO = 3V, VBEN = GND, IBO = 0A, L = 10µH (LPS4018-103ML), CBI=CBO = 22µF, VSW EN=VREG FB=VREG EN=VREGIN=VBO, IREGOUT=0A, unless otherwise specified. Values are at TA = 25°C unless otherwise specified. Boost Regulator Maximum Output Current vs VBI ( for VBO to drop 2.5%) Boost Regulator Efficiency vs Load Current 100 300 1.2VBI to 1.8VBO 90 240 1.2VBI to 3VBO 70 180 60 IBO - mA EFFICIENCY - % 80 50 40 120 30 20 60 10 L: LPS4018-103ML 0 0 0.01 0.1 1 10 100 1 0.5 2 IBO - mA 1.5 VBI - V Boost Minimum Start-Up Voltage vs Source Resistance Boost Minimum Start-Up Voltage vs Load Current 1.2 2.5 1.8 L: 22µH (LPS4018-223ML) 1.1 START-UP VOLTAGE - V START-UP VOLTAGE - V VBO =3V VBO =1.8V +85ºC 1 -40ºC 0.9 0.8 +25ºC 0.7 1.6 1.4 1.2 1 0.6 L: 10µH (LPS4018-103ML) 0.5 0.8 0 5 10 15 20 25 SOURCE RESISTANCE- Ω 0 30 3 6 9 12 IBO - mA 15 18 Inductor Peak Current vs Load Current INDUCTOR PEAK CURRENT - A 1.1 1 0.9 1.2VBI to 3VBO 0.8 0.7 0.6 0.5 1.2VBI to 1.8VBO 0.4 0.3 0.2 0 Page 4 25 50 IBO - mA 75 100 TS3300 Rev. 1.0 TS3300 TYPICAL PERFORMANCE CHARACTERISTICS VBI = 1.2V, VBO = 3V, VBEN = GND, IBO = 0A, L = 10µH (LPS4018-103ML), CBI=CBO = 22µF, VSW EN=VREG FB=VREG EN=VREGIN=VBO, IREGOUT=0A, unless otherwise specified. Values are at TA = 25°C unless otherwise specified. Boost Regulator Output Voltage Ripple VBI = 1.2V, VBO = 1.8V, CBO= 22µF, IBO = 40mA VBO – 50mV/DIV VBO – 50mV/DIV Boost Regulator Output Voltage Ripple VBI = 1.2V, VBO = 1.8V, CBO= 22µF, IBO = 5mA 50µs/DIV 20µs/DIV Boost Regulator Output Voltage Ripple VBI = 1.2V, VBO = 3V, CBO= 22µF, IBO = 5mA VBO – 50mV/DIV VBO – 50mV/DIV Boost Regulator Output Voltage Ripple VBI = 1.2V, VBO = 1.8V, CBO= 22µF, IBO = 80mA 50µs/DIV 50µs/DIV VBO – 50mV/DIV Boost Regulator Output Voltage Ripple VBI = 1.2V, VBO = 3V, CBO= 22µF, IBO = 80mA 50µs/DIV TS3300 Rev. 1.0 Page 5 TS3300 TYPICAL PERFORMANCE CHARACTERISTICS VBI = 1.2V, VBO = 3V, VBEN = GND, IBO = 0A, L = 10µH (LPS4018-103ML), CBI=CBO = 22µF, VSW EN=VREG FB=VREG EN=VREGIN=VBO, IREGOUT=0A, unless otherwise specified. Values are at TA = 25°C unless otherwise specified. Boost Regulator Load Step Response VBI = 1.2V, VBO = 3V, CBO= 10µF, IBO = 5mA IBO 33mA/DIV IBO 4.17mA/DIV VBO 100mV/DIV VBO 100mV/DIV Boost Regulator Load Step Response VBI = 1.2V, VBO = 3V, CBO= 10µF, IBO = 40mA 200µs/DIV 200µs/DIV IL VBO 100mA/DIV 50mV/DIV Boost Regulator Output Voltage Ripple, Inductor Current, and LSW Voltage VBI = 1.2V, VBO = 1.8V, CBO= 22µF, IBO = 5mA L: LPS4018-103ML VLSW 1V/DIV L: LPS4018-103ML VLSW 1V/DIV IL VBO 500mA/DIV 50mV/DIV Boost Regulator Output Voltage Ripple, Inductor Current, and LSW Voltage VBI = 1.2V, VBO = 3V, CBO= 22µF, IBO = 40mA 2µs/DIV 2µs/DIV BO 1V/DIV IBI 50mA/DIV Large Output Capacitor Start-up with VANTI-CRUSHTM=0.9V CBO=500µF, RIN =10Ω, CIN=22µF, VBI=1.2V 100ms/DIV Page 6 TS3300 Rev. 1.0 TS3300 PIN FUNCTIONS PIN 1 2 NAME BI CCP 3 BEN 4 BI FB 5 6 7 8 9 10 11 12 FAC SW EN REG EN REG FB GND REGOUT REGIN GND 13 BO FB 14 BO 15 16 LSW GND EP FUNCTION Boost Input. Connect to input source. CBI Connection. Place a 3.3nF capacitor between this pin and GND Boost Enable (active low). To enable the TS3300, connect this to GND. To disable the TS3300, set the voltage to greater than VBI – 50mV. Boost Input Feedback for Anti-Crush Voltage Setting. The BI FB pin voltage is 392mV. To set the anti-crush voltage, refer to the Applications Information section and to Figure 4. Factory use only. Do not connect to GND or VDD. Leave open. Connect to REGIN. Output Load-Switch Logic Input Control (active low). Connect to REGIN. Ground. Connect this pin to the analog ground plane. Boost Regulator Load-Switch output. Boost Regulator Load-Switch input. Connect to BO for use. Ground. Connect this pin to the analog ground plane. Boost Output Feedback. The BO FB pin voltage is 505mV. BO FB coupled with a voltage divider circuit sets the boost regulator output voltage. Refer to Figure 3. Regulated output voltage set by resistor network. To set regulated output voltage, refer to Figure 3. CBO connection. Inductor Connection. Ground. Connect this pin to the analog ground plane. For best electrical and thermal performance, connect exposed paddle to GND. BLOCK DIAGRAM TS3300 Rev. 1.0 Page 7 TS3300 THEORY OF OPERATION The TS3300 is a power management product that combines a high-efficiency boost regulator and an output load switch into one package. The boost regulator can operate from supply voltages as low as 0.6V and can deliver at least 75mA at 1.2VBI and 3VBO. Under no-load conditions, the boost regulator exhibits a No-Load Input Supply Current of 10.8µA that is actually drawn from the input source while the output is within regulation. At start-up, an internal low voltage oscillator in the start-up control circuitry drives the gate of the internal FET to charge the load capacitor. Once the output voltage reaches approximately 1.1V, the main control circuitry starts to operate. With an adjustable peak inductor current, the TS3300 can provide up to 84% efficiency with a 1.2VBI and 3VBO. The input and output supply voltage range for the boost regulator is from 0.6V to 3V and 1.8V to 3.6V, respectively. The TS3300 can be operated in two different configurations, Boost Only Configuration or Boost + Output Load Switch Configuration. If the Output Load Switch is not needed, it is recommended to use the Boost Only Configuration, since the lowest quiescent current is achievable this way. Boost + Output Load Switch Operation For Boost + Output Load Switch operation, please refer to Figure 1 which displays the appropriate circuit configuration. The Boost’s Output, BO, must be connected to the Output Load Switch Input, REGIN. The Output Load Switch is controlled by REGEN, which is an Active Low Logic Input. The SWEN and REGFB pins must be connected to REGIN. During Boost + Output Load Switch operation, the Boost Shutdown Control should not be used. The BEN pin should be connected to analog ground. During this mode of operation, the Output Load Switch will require an added 1µA of Input Supply Current as drawn from the input source. The anti-crushTM feature can be used during Boost + Output Load Switch operation. The output load switch should not be used as a load disconnect. Refer to Table 1 for the Output Load Switch settings. OUTPUT LOAD SWITCH FUNCTION SW EN REGIN REG EN FUNCTION VREGOUT=GND High (OFF State) REG FB, SW EN, REGIN should be connected to BO. VREGOUT=VBO Low (ON State) REG FB Table 1. Output Load Switch settings Figure 1. Boost + Output Load Switch Circuit Configuration Page 8 TS3300 Rev. 1.0 TS3300 Boost Only Operation For Boost Only operation, please refer to Figure 2 which displays the appropriate circuit configuration. The Anti-Crush feature can be used during Boost Only operation. During Boost Only operation, a shutdown (BEN) pin is available to shutdown the boost regulator. The boost regulator is in shutdown mode when BEN is HIGH. During shutdown, the supply current reduces to 0.1µA. For Boost Only operation, the following pins should be connected to analog ground, REGIN, REGOUT, REGFB, REGEN, and SWEN. How to Set the Boost Output Voltage The output voltage can be set via a voltage divider circuit as shown in Figure 3. The output feedback (BO FB) pin is 505mV. It is recommended to use large resistor values to minimize additional current draw at the output. Resistors values less than 8MΩ are recommended. To set a 3V output voltage with R2 = 1.37MΩ, R1 is calculated to be 6.77MΩ. A 1% standard resistor value of 6.81MΩ can be selected. This results in an output voltage of 3.02V. APPLICATIONS INFORMATION Inductor Selection A low ESR, shielded 10μH inductor is recommended for most applications and provides the best compromise between efficiency and size. A low loss ferrite and low dc resistance (DCR) inductor is best for optimal efficiency. Furthermore, there should exist at least an 8% margin between the saturation current of the inductor and the peak inductor current for a given set of operating conditions. Table 2 provides a list of inductor manufactures. Refer to the Inductor Peak Current vs Load Current plot in the “Typical Performance Characteristics” section. This plot shows how the inductor peak current varies with load current with a LPS4018-103ML inductor from Coilcraft. Inductors Supplier Website Coilcraft www.coilcraft.com Murata www.murata.com Sumida www.sumida.com Table 2. Inductor Manufactures Figure 3. Setting the Boost Output Voltage with a Voltage Divider Using the following equation to solve for R1 for a given R2 value, the output voltage can be set: R1= VBO - 0.505 R2 0.505 Input and Output Capacitor Selection For the boost regulator, a low ESR ceramic input and output capacitor of at least 10μF is recommended to be placed as close as possible to the BI and BO pin. Output voltage ripple can be reduced by increasing the value of the output capacitor while providing improved transient response. Ceramic capacitors with X5R or X7R dielectric with a minimum voltage rating of 10V are recommended. Figure 2. Boost Only Circuit Configuration TS3300 Rev. 1.0 Page 9 TS3300 Boost Input Anti-CrushTM Feature To set the anti-crushTM voltage, a feedback pin (BI FB) in conjunction with a voltage divider circuit can be implemented as shown in Figure 4. The feedback pin voltage is 392mV. It is recommended to use large resistor values to minimize additional current draw at the input. Figure 4. Setting the Anti-CrushTM Voltage with a Voltage Divider Using the following equation to solve for R5 for a given R6 value, the output voltage can be set: BO 200mV/DIV BI 500mV/DIV Figure 6 shows a scope capture of the anti-crushTM feature in action at start-up under a heavy capacitive load of 500µF and an input source impedance of 10Ω. A high source impedance is typical of a weak battery source. The measurement was performed with the anti-crushTM voltage set to 0.9V. The purple and blue traces represent the input current and boost output voltage respectively. At start-up, the current rises up to 50mA and drops to approximately 30mA for approximately 40ms in order to charge the output capacitor. At this point, the voltage to the input of the TS3300 is 0.9V until the boost output achieves regulation. VANTI-CRUSHTM - 0.392 R4 Large Output Capacitor Start-up with VAnti-CrushTM=0.9V RIN=10Ω, VBI=1.2V, VBO= 3V, CBO=500µF Figure 5 shows a scope capture of the load step response. The measurement was performed with the anti-crushTM voltage set to 0.9V. The output of the Boost Regulator is pulsed with a 100mA load every 100ms for 1ms as shown by the pink curve, the input voltage after a battery impedance of 10Ω drops from 1.2V to 0.9V as shown by the blue curve and the boost output voltage drops by only 160mV as shown by the yellow curve. The TS3300 quickly replenishes the 500µF capacitor and the output of the boost regulator returns to 3V. IBI 50mA/DIV 0.392 To set a 0.9V VANTI-CRUSHTM voltage with R4=1.37MΩ, R3 is calculated to be 1.78MΩ. The anti-crushTM voltage is to be set above the minimum input voltage specification of the TS3300. Page 10 Figure 5. Using Anti-CrushTM Feature to Maintain Output Regulation with Load Step Response BO 1V/DIV R3= Boost Load Step Response with VAnti-CrushTM=0.9V RIN=10Ω, VBI=1.2V, VBO= 3V, CBO=500µF, IBO=100mA IBO 83mA/DIV The TS3300 includes an anti-crushTM feature to prevent the collapse of the input voltage to the boost regulator when the input is a weak (high impedance) source. If the input voltage drops below a determined voltage threshold (settable by a resistor divider), the boost regulator switching cycles are paused, effectively limiting the minimum input voltage. Anti-crushTM is useful in applications where a buffer capacitor at the boost’s output can service burst loads, and the input source exhibits substantial source impedance (such as with an old battery, or at cold temperatures). Figure 6. Using Anti-CrushTM Feature at Start-up with Large Output Capacitor and a 10Ω Input Impedance. TS3300 Rev. 1.0 TS3300 PACKAGE OUTLINE DRAWING Patent Notice Silicon Labs invests in research and development to help our customers differentiate in the market with innovative low-power, small size, analog-intensive mixed-signal solutions. Silicon Labs' extensive patent portfolio is a testament to our unique approach and world-class engineering team. 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