UNISONIC TECHNOLOGIES CO., LTD P1686 LINEAR INTEGRATED CIRCUIT 600KHZ, 3A STEP-DOWN CURRENT MDOE SWITCHING REGULATOR DESCRIPTION As a current mode switching regulator with an integrated switch, the UTC P1686 is operating at 600kHz with separate sync and enable functions. In order to avoid frequency beating in noise sensitive applications the sync function allows customers to synchronize to a faster clock. Cost effective low power solutions is considered in the integrated switch ,and so peak switch current 3 amps. Very small passive components is considered in High frequency of operation. Current mode operation: fast dynamic response and instantaneous duty cycle adjustment as the input changes, as a ideal for CPE applications where the input is a wall plug power. The low shutdown current as ideal for portable applications when battery life is important. The UTC P1686 is synchronizable to a frequency from 750kHz to 1.2MHz. FEATURES * Integrated 3 Amp switch * 600kHz frequency of operation * Current mode controller * Synchronizable to higher frequency up to 1.2MHz * 6μA low shutdown current ORDERING INFORMATION Ordering Number Normal Lead Free Plating P1686-S08-R P1686L-S08-R P1686-S08-T P1686L-S08-T P1686-SH2-R P1686L-SH2-R P1686-SH2-T P1686L-SH2-T www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd Package Packing SOP-8 SOP-8 HSOP-8 HSOP-8 Tape Reel Tube Tape Reel Tube 1 of 6 QW-R103-039.C P1686 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION SOP-8 HSOP-8 BST 1 8 SYNC IN 2 7 EN SW 3 6 COMP GND 4 5 FB BST 1 IN 2 SW 3 GND 4 GND 8 SYNC 7 EN 6 COMP 5 FB PIN DESCRIPTION PIN NO. PIN NAME 1 BST 2 IN 3 SW 4 GND 5 FB 6 COMP 7 EN 8 SYNC PIN FUNCTION Providing power to the internal NPN switch. To turn on for this switch the lowest voltage is 2.7V. This PIN delivers all control and power circuitry’s power, and sees high di/dt during switching. A decoupling capacitor is better to be attached to this pin very closely. This PIN is the emitter of the internal switch and should be connected with the external freewheeling diode very closely. Almost all voltages are measured with respect to this pin. The decoupling capacitor and the freewheeling diode is better to be connected to this PIN as short as possible. Input of feedback for adjustable output controllers. Output of the internal error amplifier and also input of the peak current comparator. To achieve the specified performance a compensation network is connected to this pin. Chip enable input. EN is high: the regulator switched on; EN is low: off. EN is low: the regulator is in standby mode, and the input supply current is reduced to a few microamperes. Synchronous control pin used to synchronize the internal oscillator to an external pulse control signal. But it should be connected to GND when not used. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-039.C P1686 BLOCK DIAGRAM COMP 6 ISEN 40m SLOPE + 2 IN + IS + LINEAR INTEGRATED CIRCUIT + - FB 5 PWM EA 1 BS IS 1V EN 7 REFERENCE UVLO SOFT START HICCUP OL 0.7V S Q R POWER TRANSISTOR FB 3 SW SLOPE SYNC 8 OSCILLATOR SLOPE COMP FREQUENCY CLK 4 GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-039.C P1686 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNITS Input Supply Voltage VIN -0.3 ~ +28 V Boost Pin Above VSW (VBST -VSW) 16 V Boost Pin Voltage VBST -0.3 ~ +32 V EN Pin Voltage VEN -0.3 ~ +16 V FB Pin Voltage VFB -0.3 ~ +6 V FB Pin Current IFB 1 mA SYNC Pin Current ISYNC 1 mA Junction Temperature TJ 150 °C Operating Temperature TOPR -40 ~ +85 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient SYMBOL θJA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw RATINGS 36.5 UNITS °C/W 4 of 6 QW-R103-039.C P1686 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (VIN = 12V, VCOMP = 0.8V, VBS = VIN + 5V, EN = tied to VIN, SYNC = 0, SW = open. TA = TJ = -40°C ~ 85°C.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Operating Input Voltage (Note 1) VIN 16 V Maximum Switch Current Limit ISW 3.0 A Oscillator Frequency fOSC 550 600 750 kHz Switch On Voltage Drop VD(SW) ISW = 3A 330 mV VIN Undervoltage Lockout VUVLO TA = 25°C 2.60 3 V VIN Supply Current IQ VFB = VOUT(NOM) + 17% 1.0 5 mA VEN = 0V, VIN = VBOOST = 16V, 5 45 μA Standby Current IQ(OFF) VSW = 0V FB Input Current IFB -0.25 -0.50 μA Feedback Voltage 1.176 1.2 1.224 V Feedback Voltage Line Regulation 3V < VIN < 16V (Note 2) +3 mV/V FB to VCOMP Voltage Gain (Note 3) 0.4V ≤ VCOMP ≤ 0.9V 150 350 FB to VCOMP Transconductance (Note 3) Δ ICOMP = ± 10μA 500 850 1300 μMho VCOMP Pin Source Current VFB = VOUT(NOM) -17% 70 110 μA VCOMP Pin Sink Current VFB = VOUT(NOM) + 17% 70 110 μA VCOMP Pin to Switch Current Trans 2.5 A/V conductance VCOMP Pin Maximum Switching Duty cycle = 0% 0.35 V Threshold VCOMP Pin Threshold ISW = 3A 0.9 V Maximum Switch Duty Cycle VCOMP = 1.2V, ISW = 400mA 85 % Minimum Boost Voltage Above Switch ISW = 3A, 0°C ≤ TA ≤ 85°C VBOOST 1.8 2.7 V (Note 3) ISW =2.5A, TA < 0°C ISW = 1A 10 15 Boost Current IBOOST ISW = 3A, 0°C ≤ TA ≤ 85°C mA 30 45 ISW =2.5A, TA < 0°C 3 V VIH Enable Input Threshold Voltage VIL 0.4 V EN = 60mV above threshold 2.5 μA IIL Enable Input Bias Current IIH EN = 100mV below threshold 5 15 μA SYNC Threshold Voltage 1.5 V SYNC Input Frequency (Note 4) 750 1200 kHz SYNC Pin Resistance VSYNC = 0.5V 20 kΩ Note: 1. The device may not function properly outside its operating input voltage range. 2. The required minimum input voltage for a regulated output depends on the output voltage and load condition. 3. Guaranteed by design. 4. For SYNC applications, please contact factory. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-039.C P1686 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT APPLICATION CIRCUIT D1 Design Example: 16V to 5V at 2A C1 0.22u 1 2 VIN=16V C3 10u BS IN R4 4.75K 3 SW D3 VO=5V R1 31.6k UTC P1686 7 8 FB EN SYNC L1 8.2uH C2 10u 5 D2 6 COMP GND 4 C4 3.3n C5 180p R2 10k R3 3.4k UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R103-039.C