TB7102F Toshiba BiCD Integrated Circuit Silicon Monolithic TB7102F Step-down DC-DC Converter IC The TB7102F is a single-chip step-down DC-DC converter IC. Equipped with a built-in high-speed and low on-resistance power MOSFET, and utilizing a synchronous rectifier circuit, this IC can achieve high efficiency. Features • Capable of high current drive (IOUT = maximum of 1 A), using only a few external components • High efficiency (η = 95% ) SON8-P-0303-0.65A Weight : 0.017 g (typ.) (@VIN = 5V, VOUT = 3.3V, and IOUT = 300 mA). • Operating voltage (VIN) range: 2.7V to 5.5 V • High oscillation frequency of 1 MHz (typ.), making it possible to use small external components. • Uses internal phase compensation, achieving high efficiency using only a few external components. • A small surface mount-type ceramic capacitor can be used as an output smoothing capacitor. • Housed in a small surface-mount package (PS-8) with low thermal resistance. • Under voltage lock out (U.V.L.O), Heat protection, and Over Current Protection is built into. Pin Assignment Marking PGND 1 8 LX VIN 2 7 VFB EN 3 6 N.C Part number 7102 ※ ・The dot (•) on the top surface indicates pin 1. SGND 4 5 N.C *: Lot number * The Lot number comprises three numerals. The first numeral represents the last digit of the year of manufacture, and the following two digits indicate the week of manufacture, beginning with 01 and continuing to either 52 or 53. Manufacturing week Code (The first week of the year is 01,continuing up to 52 or 53) Manufacturing year Code (Last digit of the year of manufacture) Due to its MOS structure, this product is sensitive to electrostatic discharge. Handle with care. 1 2007-06-20 TB7102F How to Order Product No. Package Type and Capacity TB7102F(TE85L,F) Emboss Taping (3000pcs / reel ) Block Diagram VIN EN Under Voltage lock out Soft Start Reference Volage Current Detection OSCILLATOR + - DRIVER PWM comparator SLOPE compensation LX Control Logic + - DRIVER PGND VFB Error amplifier - Phase compensation Heat Protection VCOMP + 0.8V(TYP.) SGND Pin Descriptions Pin No. Pin Symbol 1 PGN 2 VIN Pin Description Power ground Input pin. This pin is placed in the standby state if VENB = low. 1 μA or lower operating current. Enable pin. This pin is connected to the CMOS inverter. Applying 3.5 V or higher (@ VIN = 5 V) 3 EN 4 SGND 5 N.C. No connection 6 N.C. No connection 7 VFB 8 LX to this pin starts the internal circuit switching control. Signal ground Output voltage feedback pin. This is connected to the internal error amplifier, which is supplied with a reference voltage of 0.8 V (typ.). Switching pin. This pin is connected to high side Pch MOS FET and low side Nch MOS FET. 2 2007-06-20 TB7102F Timing Chart Normal operation OSC 0 IOUT 0 VOUT 0 VCOMP IL VLX 0 The peak switch current is determined VCOMP. 0 0 TON T Overheat state operation OSC 0 Tch increase Hysteresis: 25°C (typ.) Tch VLX Low Voltage operation VIN Hysteresis: 0.1 V (typ) 0 OSC VLX 0 0 OSC : Internal oscillator output voltage IOUT : Load current VOUT : Output voltage VCOMP : Output voltage of Error amplifier : Inductor current IL : LX pin voltage VLX VIN : Input pin voltage Tch : Channel temperature 3 2007-06-20 TB7102F Absolute maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Input voltage VIN -0.3～6 V Switch pin voltage VLX -0.3～6 V Feedback pin voltage VFB -0.3～6 V Enable pin voltage VEN -0.3～6 V VEN-VIN VEN-VIN<0.3 V PD 0.7 Input-enable pin voltage Power dissipation (Note 1) Operating temperature Operating junction temperature Channel temperature Storage temperature Topr Tjopr Tch Tstg W -40～85 o -40～125 o 150 o -55～150 o C C C C Note 2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may significantly reduce the reliability of this product even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please consult the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc) when designing the appropriate reliability while. Thermal Resistance Characteristic Characteristics Thermal resistance, channel and ambient Symbol Max Unit Rth (ch-a) 178.6 (Note 1) °C /W (Note 1) Glass epoxy board Material : FR-4 25.4 × 25.4 × 0.8 (Unit: mm) 4 2007-06-20 TB7102F Electrical Characteristics (unless otherwise specified: Tj = 25°C and VIN = 2.7 to 5.5 V) Characteristics Symbol Test circuit Test condition VIN(OPR) － － IIN(1) － IIN(2) － IIN(STBY)(1) － VIN= 5V, VEN= 5V, VFB =5V VIN= 2.7V, VEN= 2.7V, VFB =2.7V VIN= 5V, VEN= 0V IIN(STBY)(2) － VIN= 2.7V, VEN= 0V VIH(EN)(1) － VIN= 5V VIH(EN)(2) － VIN= 2.7V VIL(EN)(1) － VIL(EN)(2) Min Typ. Max 2.7 － 5.5 V － 0.68 0.9 mA － 0.55 0.7 mA － － 1 μA － － 1 μA 3.5 － － V 1.9 － － V VIN= 5V － － 1.5 V － VIN= 2.7V － － 0.8 V IIH(EN)(1) － VIN= 5V, VEN= 5V 6 － 20 μA IIH(EN)(2) － VIN= 2.7V, VEN= 2.7V 3 － 10 μA VFB(1) － VIN= 5V, VEN= 5V 0.776 0.8 0.824 V VFB(2) － VIN= 2.7V, VEN= 2.7V 0.776 0.8 0.824 V IFB(1) － VIN= 5V, VEN= 5V -1 － 1 μA IFB(1) － -1 － 1 μA Line regulation LINE REG － － 3.2 10 mV/V Load regulation LOAD REG － － 9 40 mV/A RDS(ON)(H)(1) － － 0.27 － Ω － 0.36 － Ω － 0.27 － Ω － 0.3 － Ω － － -1 μA － － 1 μA Operating supply voltage Operating current Standby current Enable pin threshold voltage Enable pin input current Feedback pin voltage Feedback pin current Unit High-side leakage current ILEAK(H) － VIN= 2.7V, VEN= 2.7V VIN= VEN= 2.7V～5.5V VOUT=2.0V IOUT= 10mA VIN=5V, VOUT=2.0V IOUT= 10mA～500mA VIN= 5V, VEN= 5V, ILX= 0.5A VIN= 2.7V, VEN= 2.7V ILX= 0.5A VIN= 5V, VEN= 5V ILX= 0.5A VIN= 2.7V, VEN= 2.7V ILX= 0.5A VIN= 5V, VEN= 0V, VLX= 0V Low-side leakage current ILEAK(L) － VIN= 5V, VEN= 0V, VLX= 5V fOSC(1) － VIN= 5V, VEN= 5V 0.85 1 1.15 MHz fOSC(2) － VIN= 2.7V, VEN= 2.7V 0.85 1 1.15 MHz tss(1) － 1 2 － ms tss(2) － 1.3 2.4 － ms VUV － VIN=5V , VEN=5V, (no load) VIN=2.7V , VEN=2.7V, (no load) － 2.2 2.5 2.7 V ΔVUV － － 0.1 － V High-side on-state resistance RDS(ON)(H)(2) Low-side on-state resistance RDS(ON)(L)(1) RDS(ON)(L)(2) Oscillation frequency Soft start time Undervoltage Detection protection Hysteresis － 5 2007-06-20 TB7102F Electrical Characteristics Common to All Products When a pulse test is carried out, Tj = 25°C is the standard condition in the measurements for each item. Any drift in the electrical characteristic due to a rise in the junction temperature of the chip may be disregarded. Protection function (reference data) TSD Detection Overheat protection Hysteresis － － － ΔTSD － － 160 20 － o C － o C Application Circuit Example VIN VIN EN VFB TB7102F CIN SGND Lx PGND L RFB1 RFB2 GND VOUT COUT GND Figure 1: TB7102F application circuit example Component constants The following values are given only for your reference and may need tuning depending on your input/output conditions and board layout. CIN: Input smoothing capacitance of 10 μF (multilayer ceramic capacitor JMK212BJ106KG, manufactured by Taiyo Yuden Co., Ltd.) COUT: Output smoothing capacitance of 10 μF (multilayer ceramic capacitor JMK212BJ106KG manufactured by Taiyo Yuden Co., Ltd.) RFB1: Output voltage setting resistance of 75 kΩ (@ VIN = 5 V, VOUT = 3.3 V) RFB2: Output voltage setting resistance of 24 kΩ (@ VIN = 5 V, VOUT = 3.3 V) L: Inductor3.3 μH (@ VIN = 5 V, VOUT = 3.3 V); CDRH4D28C/LD series, manufactured by Sumida Corporation How to use Setting the Inductance The required inductance can be calculated by using the following equation: L= V IN − VOUT VOUT ⋅ f OSC ⋅ ΔI L V IN VIN: Input voltage (V) VOUT: Output voltage (V) … (1) fOSC: Oscillation frequency (Hz) ΔIL: Inductor ripple current (A) * Generally, ΔIL should be set to 30% to 40% of the maximum output current . For the TB7102F, set ΔIL to 0.3 A, as its maximum current [ILX(MAX)] is 1 A (min). Therefore select an inductor whose current rating is no lower than the peak switch current [1.15 A (min)] of the TB7102F. If the current rating is exceeded, the inductor becomes saturated, leading to an unstable DC-DC converter operation. If VIN = 5 V and VOUT = 3.3 V, the required inductance can be calculated as below. Be sure to select an inductor 6 2007-06-20 TB7102F with an optimum constant by taking VIN variations into consideration. L= V IN − VOUT VOUT ⋅ f OSC ⋅ ΔI L V IN ΔIL I 5V − 3.3V 3.3V ⋅ 1MHz ⋅ 300mA 5V = 3.7 μH 0 = T= 1 fOSC TON = T ⋅ VOUT VIN Figure 2: Inductor current waveform Setting the output voltage For the TB7102F, the output voltage is set using the voltage dividing resistors RFB1 and RFB2 according to the reference voltage [0.8 V (typ.)] of the error amplifier connected to the FB pin. The output voltage can be calculated by using equation 2 below. If the RFB1 value is extremely large, a delay can occur due to parasitic capacitance at the FB pin. Keep the RFB1 value at approximately 10 kΩ. Output voltage that can be set is from 0.8 V (typ.) to Input voltage -1V. It is recommended that a resistor with a precision of ±1% or higher be used for setting the output voltage. VOUT = VREF ⋅ (1 + Table1 :Example of output voltage setting RFB1 ) RFB2 R = 0.8 × (1 + FB1 ) RFB2 VOUT Lx … (2) FB RFB1 RFB2 Figure 3: Output voltage setting resistors Output Voltage RFB1 RFB2 1.2V 1.2kΩ 2.4kΩ 1.5V 2.1kΩ 2.4kΩ 1.8V 3.0kΩ 2.4kΩ 2.5V 5.1kΩ 2.4kΩ 3.3V 7.5kΩ 2.4kΩ Output capacitor The capacitance of the output ceramic capacitor is greatly affected by temperature. Select a product whose temperature characteristics (such as B-characteristic) are excellent. The capacity value should be adjusted to about 10μF(@Output Voltage 2.0V~4.5V), or about 22μF(@Output Voltage 1.2V~2.0V),and the capacitance set to an optimum value that meets the set's ripple requirement. Ceramic capacitors can be used to achieve low output ripple. It is more difficult to achieve phase compensation with ceramic capacitors because the equivalent series resistance (ESR) of the former is lower. For this reason, perform a careful evaluation when using ceramic capacitors. Precautions • Please select parts after confirming the actual operation in the customer set and considering the input voltage the output voltage, the output current, the temperature, the characteristics or the kind of capacitor, the inductor and resistance . • If the voltage between the input and output is low, the influence of the on-state voltage of the switch power MOSFET is greater, causing the voltage across the inductor to decrease. For this reason, it may become impossible for the required inductor current to flow, resulting in lower performance or unstable operation of the DC-DC converter. As a rough standard, keep the input-output voltage potential difference at or above 1 V, taking the on-state voltage of the power MOSFET into consideration. • The lowest output voltage that can be set is 0.8 V (typ.). • There is an antistatic diode between the ENB and VIN pins. The voltage between the ENB and VIN pins should satisfy the rating VENB - VIN < 0.3 V • If the operation becomes unstable due to the switching noise under a heavy load, please mount a by-pass capacitor Ccc between the SGND pin and the VIN pin. 7 2007-06-20 TB7102F Characteristic data IIN – VIN IIN – Ta (μA) 800 VIN = VEN = VFB o Ta= 25 C 0 2 4 Input voltage 700 600 500 VIN = 5.5V VEN = 5.5V VIN = VFB -40 0 40 Ambient temperature 400 80 Ta VIN = 2.7V VEN = 2.7V VIN = VFB -40 0 120 160 Ta 120 160 (°C ) 2 VIH VIL 1 0 -80 VIN = 2.7V VOUT = 1.5V -40 0 40 80 Ambient temperature (°C ) Ta 120 160 (°C ) IIH– VIN 3.5 3 (μA) 20 IIH VIH EN pin input current VIH,VIL (V) 80 VIH ,VIL – Ta 3 VIH ,VIL – Ta EN pin threshold voltage 40 Ambient temperature 800 400 -80 500 (V ) VIH,VIL (V) (μA) VIN 600 300 -80 6 IIN – Ta 900 IIN Operating current 200 EN pin threshold voltage Operating current 400 0 Operating current 700 IIN 600 IIN (μA) 800 2.5 VIL 2 VIN = 5V VOUT = 3.3V 1.5 -80 -40 0 40 Ambient temperature 80 120 Ta (°C ) 10 VIN = VEN Ta = 25°C 0 160 0 2 Input voltage 8 4 6 VIN 8 (V ) 2007-06-20 TB7102F IIH– Ta (μA) Undervoltage detection EN pin input current IIH 16 12 8 4 0 VIN = 5V VEN = 5V VOUT = 3.3V -80 -40 0 VUV – Ta 2.6 VUV (V) 20 40 80 Ambient temperature Ta 120 2.5 Detection 2.45 2.4 160 Return 2.55 -80 (°C ) -40 0 Ambient temperature VOUT – VIN 80 120 Ta 160 (°C ) VFB – VIN 0.85 VOUT VFB (V) (V) 4 0 VIN = VEN VOUT = 3.3V Ta = 25°C 2.5 3 Input voltage 3.5 VIN Feedback pin voltage Output voltage 2 2 4 0.8 VIN = VEN VOUT = 1.5V Ta = 25°C 0.75 4 2 3 (V ) 4 Input voltage 5 VIN 6 (V ) VFB – Ta VFB – Ta 0.85 VFB (V) (V) 0.85 Feedback pin voltage VFB Feedback pin voltage 40 0.8 0.75 VIN = 2.7V VEN = 2.7V VOUT = 1.5V -80 -40 0 40 Ambient temperature 80 100 Ta (°C ) 0.8 0.75 -80 160 VIN = 5V VEN = 5V VOUT = 3.3V -40 0 40 Ambient temperature 9 80 120 Ta (°C ) 140 2007-06-20 TB7102F fOSC – VIN fOSC – Ta 1200 (kHz) fOSC 1100 Oscillation frequency Oscillation frequency fOSC (kHz) 1200 1000 900 VIN = VEN VOUT = 1.5V Ta = 25°C 800 2 3 4 Input voltage 5 VIN VOUT (V) Output Volatage VOUT (V) Output Voltage 1.18 VOUT = 1.2V L = 3.3 μH COUT = 22μF Ta = 25°C 1.22 120 Ta (°C ) 160 VIN=3.3 V 1.18 VOUT = 1.2V L = 3.3 μH COUT = 22μF Ta = 25°C 1.16 VOUT – IOUT 1 0.1 Load Current IOUT (A) VOUT – VIN 1.26 1.24 VIN=5.0 V 3.3 3.245 VOUT = 3.3V L = 3.3 μH COUT = 10μF Ta = 25°C 3.190 3.135 0.01 80 1.24 (A) 3.410 3.355 40 1.14 0.01 1 Output Voltage VOUT (V) VOUT (V) Output Voltage 1.2 3.465 0 VOUT – IOUT VIN= 5.0V IOUT -40 1.26 1.22 Load Current VIN = 5V VEN = 5V VOUT = 3.3V Ambient temperature 1.24 0.1 900 (V ) 1.26 1.14 0.01 1000 800 -80 6 VOUT – IOUT 1.16 1100 1.22 IOUT = 0.2A 1.2 1.18 VOUT = 1.2V L = 3.3 μH COUT = 22μF Ta =25°C 1.16 1.14 Load Current 2 1 0.1 IOUT 3 4 Input Voltage (A) 10 5 VIN 6 (V) 2007-06-20 TB7102F 80 VIN = 5.0V IOUT = 0.2A 3.3 3.245 η 3.355 60 Efficiency (%) 3.410 40 VOUT = 3.3V L = 3.3 μH COUT = 10μF Ta = 25°C 3.190 3.135 2 3 4 Input Voltage 5 VIN VOUT = 1.2V L = 3.3 μH COUT = 22μF Ta = 25°C 20 0 0 6 0.2 (V) 0.6 IOUT 0.8 1 (A) η – IOUT 100 100 80 60 40 VOUT = 1.2V L = 3.3 μH COUT = 22μF Ta = 25°C 20 0 0 0.2 0.4 Load Current VIN = 5.0V (%) VIN = 3.3V 0.6 IOUT 0.8 η 80 60 Efficiency (%) 0.4 Load Current η – IOUT η Output Voltage η – IOUT 100 Efficiency VOUT (V) VOUT – VIN 3.465 40 VOUT = 3.3V L = 3.3 μH COUT = 10μF Ta = 25°C 20 0 0 1 (A) 0.2 0.4 Load Current 11 0.6 0.8 IOUT 1 (A) 2007-06-20 TB7102F Package dimensions SON8-P-0303-0.65A Unit: mm 8 5 1 4 0.33 ± 0.05 0.05 M A 2.8 ± 0.1 2.4 ± 0.1 0.1 max 0.17 ± 0.02 B 0.05 M B 0.475 0.65 2.9 ± 0.1 0.025 S 1.12 +0.13 - 0.12 0.28 +0.1 - 0.11 S 1.12 0.8 ± 0.05 +0.13 - 0.12 0.28 +0.1 - 0.11 A Weight: 0.017 g (Typ.) 12 2007-06-20 TB7102F RESTRICTIONS ON PRODUCT USE 20070701-EN • The information contained herein is subject to change without notice. • TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc. • The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer’s own risk. • The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. • Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations. 13 2007-06-20