LT3380IUJM#TRPBF

LT3380 Multioutput Power Management Solution with Four Buck Switching and Three LDO Linear Regulators with I2C DESCRIPTION FEATURES Quad I2C Adjustable High Efficiency Step-Down DC/DC Converters: 2.5A, 2.5A, 1.5A, 1.5A n Three 300mA LDO Regulators (Two Adjustable) n Independent Enable Pin-Strap or I2C Sequencing n Programmable Autonomous Power-Down Control n Warnings and Faults n IRQ Pin and IRQ Status Register n Power Good Pin and Status Register n 150°C T Operation (LT3380H) J n Dynamic Voltage Scaling n Selectable 2.25MHz or 1.12MHz Switching Frequency n 12µA Standby Current n Side Wettable 40-Lead 6mm × 6mm QFN Package n AEC-Q100 Qualified for Automotive Applications The LT®3380 is a complete power management solution for advanced portable application processor-based systems. The device contains four synchronous step-down DC/DC converters for core, memory, I/O, and system onchip (SoC) rails and three 300mA LDO regulators for low noise analog supplies. An I2C serial port may be used to control regulator enables, power-down sequencing, output voltage levels, dynamic voltage scaling, operating modes, and status reporting. APPLICATIONS The device is available in a 40-lead 6mm × 6mm QFN with wettable flanks for optical inspection. n Automotive Industrial n Communications n General Purpose Multichannel Power Supplies n Regulator start-up is sequenced by connecting outputs to enable pins in the desired order or via the I2C port. The LT3380 outputs may be sequenced off in one of four time slots selected using I2C command registers. All registered trademarks and trademarks are the property of their respective owners. n TYPICAL APPLICATION SW1 VIN 2.7V TO 5.5V 1µH Start-Up Sequence 2.5A VIN_L1 1.7V TO VIN 300mA FB_B1 LDO1 1µF FB_L1 PWR_ON 47µF 5V/DIV LT3380 SW2 1µH 2.5A LDO1 LDO2 1V/DIV VIN_L2 1.7V TO VIN 300mA FB_B2 47µF LDO2 1µF FB_L2 SW3 1µH LDO3 1µF SW4 1µH FB_B4 7 DVDD BUCK4 47µF VIN_L3 1.8V TO VIN 1.6V TO 5.5V BUCK3 1.5A 1V/DIV FB_B3 1.8V 300mA BUCK1 AND BUCK2 I 2C ENABLES IRQ PWR_ON PGOOD 1ms/DIV 3380 TA01b 1.5A 47µF 2 3380 TA01a Rev. B Document Feedback For more information www.analog.com 1 LT3380 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) SW3 IRQ GND EN_B3 PVIN3 PVIN4 EN_B4 GND PGOOD TOP VIEW SW4 VIN, DVDD...................................................... –0.3V to 6V PVIN1, PVIN2, PVIN3, PVIN4......... VIN – 0.3V to VIN + 0.3V VIN_L1, VIN_L2, VIN_L3....................... –0.3V to VIN + 0.3V LDO1, FB_L1, LDO2, FB_L2, LDO3, FB_B1, FB_B2, FB_B3, FB_B4, PGOOD, EN_B1, EN_B2, EN_B3, EN_B4, EN_L1, EN_L2, EN_L3, PWR_ON, IRQ.......... –0.3V to 6V SDA, SCL.......................................–0.3V to DVDD + 0.3V Operating Junction Temperature Range (Notes 2, 3)............................................. –40°C to 150°C Storage Temperature Range................... –65°C to 150°C 40 39 38 37 36 35 34 33 32 31 FB_L2 1 30 EN_L2 VIN_L2 2 29 GND LDO2 3 28 GND LDO3 4 27 VIN VIN_L3 5 26 GND 41 GND LDO1 6 25 FB_B3 VIN_L1 7 24 FB_B4 FB_L1 8 23 FB_B1 EN_L1 9 22 FB_B2 EN_L3 10 21 PWR_ON SW2 GND EN_B2 EN_B1 PVIN2 PVIN1 SCL SDA SW1 DVDD 11 12 13 14 15 16 17 18 19 20 UJM PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 150°C, θJA = 33°C/W, θJC = 2°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3380EUJM#PBF LT3380EUJM#TRPBF LT3380UJM 40-Lead Plastic Side Wettable QFN (6mm  6mm) –40°C to 125°C LT3380IUJM#PBF LT3380IUJM#TRPBF LT3380UJM 40-Lead Plastic Side Wettable QFN (6mm  6mm) –40°C to 125°C LT3380HUJM#PBF LT3380HUJM#TRPBF LT3380UJM 40-Lead Plastic Side Wettable QFN (6mm  6mm) –40°C to 150°C AUTOMOTIVE PRODUCTS** LT3380IUJM#WPBF LT3380IUJM#WTRPBF LT3380UJM LT3380HUJM#WTRPBF LT3380UJM LT3380HUJM#WPBF 40-Lead Plastic Side Wettable QFN (6mm  6mm) 40-Lead Plastic Side Wettable QFN (6mm  6mm) –40°C to 125°C –40°C to 150°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. 2 Rev. B For more information www.analog.com LT3380 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = DVDD = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS Operating Input Supply Voltage, VIN VIN Standby Current PWR_ON = 0V VIN Undervoltage Fault Rising (Note 7) VIN Undervoltage Fault Falling VIN Undervoltage Warning Falling MIN l TYP 2.7 MAX UNITS 5.5 V l 12 21 µA l l 2.55 2.45 2.65 V V 2.35 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 CNTRL[4:2] = 000 (POR Default) CNTRL[4:2] = 001 CNTRL[4:2] = 010 CNTRL[4:2] = 011 CNTRL[4:2] = 100 CNTRL[4:2] = 101 CNTRL[4:2] = 110 CNTRL[4:2] = 111 V V V V V V V V Step-Down Switching Regulators 1, 2, 3 and 4 Output Voltage Range l Burst Mode VIN Quiescent Current Pulse-Skipping Mode VIN Quiescent Current Forced Continuous VIN Quiescent Current VFB_Bx = 850mV (Note 5) VFB_Bx = 850mV (Note 5) VFB_Bx = 0V (Note 5) Feedback Pin Input Current VFB_Bx = 850mV Maximum Duty Cycle VFB_Bx = 0V ® Minimum Duty Cycle VFB 23 120 170 l l l –0.05 l PVIN V 50 200 300 µA µA µA 0.05 µA 100 % 18 l 24 % SW Pull-Down Resistance Regulator Disabled 625 Ω Feedback Reference Soft-Start Rate (Note 6) 0.8 V/ms High Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11111, VIN = 2.7V to 5.5V l 788 800 812 mV Default Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 11001, VIN = 2.7V to 5.5V l 714 725 736 mV Low Feedback Regulation Voltage (VFB) DVBxA[4:0] = DVBxB[4:0] = 00000, VIN = 2.7V to 5.5V l 404 412.5 421 mV BUCKx[2] = 0 BUCKx[2] = 1 l l 1.7 0.85 l 2.0 Feedback LSB Step Size Switching Frequency 12.5 2.25 1.125 mV 2.7 1.35 MHz MHz 1.5A Step-Down Switching Regulators 3 and 4 PMOS Current Limit A PMOS On-Resistance 160 mΩ NMOS On-Resistance 80 mΩ PMOS On-Resistance 120 mΩ NMOS On-Resistance 70 mΩ 10 V/ms 625 Ω 2.5A Step-Down Switching Regulators 1 and 2 PMOS Current Limit l 3.0 A LDO Regulators 1, 2 and 3 Feedback Reference Soft-Start Rate Output Pull-Down Resistance Regulator Disabled LDO Regulators 1 and 2 VIN_Lx Input Voltage Output Voltage Range l ILDO = 0mA 1.7 VIN V VFB VIN_Lx V Rev. B For more information www.analog.com 3 LT3380 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = DVDD = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS Available Output Current MIN l TYP MAX 300 UNITS mA VIN_Lx Quiescent Current VIN_Lx Shutdown Current Regulator Enabled, ILDO = 0A Regulator Disabled l l 12 0 25 1 µA µA VIN Quiescent Current Regulator Enabled l 50 85 µA 0.725 0.743 Feedback Regulation Voltage l 0.707 Line Regulation ILDO =1mA, VIN = 2.7V to 5.5V 0.01 Load Regulation ILDO = 1mA to 300mA 0.01 Short-Circuit Current Limit Dropout Voltage (Note 4) ILDO = 300mA, VLDO = 2.5V ILDO = 300mA, VLDO = 1.2V Feedback Pin Input Current VFB_Lx = 725mV V %/V % 770 mA 260 615 mV mV –0.05 0.05 µA l 2.35 VIN V l 1.746 1.8 1.854 V l 300 210 450 LDO Regulator 3 VIN_L3 Input Voltage Output Voltage ILDO = 1mA Available Output Current mA VIN_L3 Quiescent Current VIN_L3 Shutdown Current Regulator Enabled, ILDO = 0A Regulator Disabled l l 14 0 25 1 µA µA VIN Quiescent Current Regulator Enabled l 50 85 µA Line Regulation ILDO =1mA, VIN = 2.7V to 5.5V 0.01 Load Regulation ILDO = 1mA to 300mA 0.05 Short-Circuit Current Limit Dropout Voltage (Note 4) ILDO = 300mA, VLDO = 1.8V %/V % 770 mA 280 350 mV 0.75 1.2 V Enable Inputs Threshold Rising All Enables Low l Threshold Falling One Enable High l 0.4 0.7 Precision Threshold One or More Regulators Previously Enabled l 0.370 0.400 Input Pull-Down Resistance V 0.430 4.5 V MΩ PWR_ON Threshold l 0.370 Pull-Down Resistance 0.400 0.430 4.5 V MΩ PWR_ON High to Allow Enables Delay 3 ms PWR_ON High to Inhibit Enables Delay 3 ms Inhibit Enable Time from PWR_ON Low 1 s Status Output Pins (PGOOD, IRQ) IRQ Output Low Voltage IIRQ = 3mA IRQ Output High Leakage Current IIRQ = 3.8mA PGOOD Output Low Voltage IPGOOD = 3mA PGOOD Output High Leakage Current VPGOOD = 3.8V –0.1 0.1 –0.1 –6 –8 PGOOD Threshold Rising PGOOD Threshold Falling 4 0.1 0.4 V 0.1 µA 0.4 V 0.1 µA % % Rev. B For more information www.analog.com LT3380 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = DVDD = 3.8V. All regulators disabled unless otherwise noted. SYMBOL I2C Port DVVDD IDVDD DVVDD_UVLO ADDRESS VIH VIL IIH IIL VOL_SDA fSCL tBUF tHD, STA tSU, STA tSU, STO tHD, DAT(O) tSU, DAT tLOW tHIGH tf tr tSP PARAMETER DVDD Input Supply Voltage DVDD Quiescent Current DVDD UVLO Level LT3380 Device Address SDA/SCL Input Threshold Rising SDA/SCL Input Threshold Falling SDA/SCL High Input Current SDA/SCL Low Input Current SDA Output Low Voltage Clock Operating Frequency Bus Free Time Between Stop and Start Condition Hold Time After Repeated Start Condition Repeated Start Condition Setup Time Stop Condition Setup Time Data Hold Time Output Data Setup Time SCL Clock Low Period SCL Clock High Period Clock/Data Fall Time Clock/Data Rise Time Input Spike Suppression Pulse Width CONDITIONS MIN l 1.6 SCL/SDA = 0kHz SDA = SCL = 5.5V SDA = SCL = 0V ISDA = 3mA TYP –1 –1 0.3 1 0111100[R/W] 70 30 0 0 MAX 5.5 1 1 1 0.4 400 1.3 CB = Capacitance of BUS Line (pF) CB = Capacitance of BUS Line (pF) Note 1: Stresses beyond those listed Under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3380 is tested under pulsed load conditions such that TJ ≈ TA. The LT3380E is guaranteed to meet specifications from 0°C to 85°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3380I is guaranteed over the –40°C to 125°C operating junction temperature range and the LT3380H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. The junction temperature (TJ in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD, in Watts), and package to junction ambient thermal impedance (JA in Watts/°C ) according to the formula: TJ = TA + (PD • JA). 0.6 0.6 0.6 0 100 1.3 0.6 20 + 0.1CB 20 + 0.1CB 900 300 300 50 UNITS V µA V %DVDD %DVDD µA µA V kHz µs µs µs µs ns ns µs µs ns ns ns Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. Note 3: The LT3380 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 4: Dropout voltage is defined as (VIN_Lx – VLDOx) when VLDOx is 3% lower than VLDOx measured with VIN = VIN_Lx = 4.3V. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 6: Soft-Start measured in test mode with regulator error amplifier in unity-gain mode. Note 7: The LT3380 will operate before VIN has risen higher than VIN undervoltage fault rising (2.65V max) but will shutdown if VIN does not cross the rising threshold in less than 5 seconds. Please refer to the Operation section. Rev. B For more information www.analog.com 5 LT3380 TYPICAL PERFORMANCE CHARACTERISTICS Standby IVIN vs VIN Step-Down Switching Regulator IVIN vs VIN LDO1 to LDO3 IVIN vs VIN 16 900 250 ENABLE 3 LDOs 14 6 150 ENABLE 1 LDO 100 3.5 4.0 4.5 5.0 0 2.50 5.5 4.50 3.50 1200 160 IVIN (µA) IVIN (µA) ENABLE ONE BUCK 2.25 600 Burst Mode OPERATION 400 40 200 20 2.5 3.0 3.5 4.0 VIN (V) 4.5 5.0 0 –50 5.5 0 100 50 TEMPERATURE (°C) 2.00 –50 150 EFFICIENCY (%) 0.4 0 –0.2 90 90 80 80 BURST 70 60 PULSE SKIPPING 50 40 FORCED CONTINUOUS 5.0 5.5 VIN (V) 0 60 PULSE SKIPPING 50 40 FORCED CONTINUOUS 20 VIN = 3.3V VOUT = 1.2V 10 4.5 BURST 70 30 20 –0.6 150 100 30 –0.4 50 100 TEMPERATURE (°C) Step-Down Switching Regulators 3 and 4 Efficiency vs IOUT EFFICIENCY (%) 0.6 0.2 0 3380 G06 100 4.0 2.10 Step-Down Switching Regulators 3 and 4 Efficiency vs IOUT 0.8 3.5 2.15 3380 G05 Oscillator Frequency Change vs VIN 3.0 2.20 2.05 STANDBY 3380 G04 –0.8 2.5 5.5 2.30 ALL REGULATORS ENABLED 800 ENABLE TWO BUCKS 60 5.0 PULSE-SKIPPING ENABLE THREE BUCKS 80 4.5 Oscillator Frequency vs Temperature 1000 ENABLE FOUR BUCKS 4.0 VIN (V) 3380 G03 Input Supply Current vs Temperature Burst Mode OPERATION 100 3.5 3.0 3380 G02 Step-Down Switching Regulator IVIN vs VIN 120 2.5 VIN (V) 3380 G01 140 0 5.50 FREQUENCY (MHz) 3.0 VIN (V) PERCENT CHANGE (%) ENABLE ONE BUCK 100 0 2.5 1 10 100 IOUT (mA) 1000 3380 G07 6 400 200 50 2 0 ENABLE TWO BUCKS 500 300 4 180 ENABLE THREE BUCKS 600 IVIN (µA) IVIN (µA) 8 ENABLE FOUR BUCKS 700 ENABLE 2 LDOs 10 PULSE-SKIPPING MODE 800 200 12 IVIN (µA) VIN = 3.8V, TA = 25°C unless otherwise noted 3380 G08 VIN = 5V VOUT = 1.2V 10 0 1 10 100 IOUT (mA) 1000 3380 G09 Rev. B For more information www.analog.com LT3380 TYPICAL PERFORMANCE CHARACTERISTICS Step-Down Switching Regulators 1 and 2 Efficiency vs IOUT Buck RDS(ON) vs Temperature 100 VIN = 3.3V 90 PULSE-SKIPPING MODE 180 200 70 VOUT = 1.2V 60 50 40 BUCK 3, 4 PMOS 150 BUCK 3, 4 NMOS 30 100 BUCK 1, 2 NMOS 40 20 1 1000 100 IOUT (mA) 10 0 –50 0 50 100 TEMPERATURE (°C) 0 150 3380 G11 Step-Down Switching Regulator Current Limit vs Temperature 5.5 3380 G12 Buck Minimum Duty Cycle vs Temperature Step-Down Switching Regulator Load Step 20 4.5 19 BUCK 1, 2 100mV/DIV 3.5 ILOAD = 0.5A TO 1.5A BUCK 3, 4 3.0 500mA/DIV 2.5 2.0 COUT = 47µF 0 50 100 TEMPERATURE (°C) VIN = 3.8V 18 VOUT = 1.2V DUTY CYCLE (%) 4.0 10µs/DIV VIN = 5.0V 17 16 15 14 13 12 3380 G14 11 10 –50 150 0 50 100 TEMPERATURE (°C) 150 3380 G15 3380 G13 LDO1 to LDO3 Dropout Voltage vs Temperature Buck Minimum Duty Cycle vs VIN 25 450 24 400 DROPOUT VOLTAGE (mV) 23 DUTY CYCLE (%) 1.5 –50 4.5 3.5 2.5 VIN (V) 3380 G10 CURRENT (A) BUCK 3, 4 NMOS 80 60 10 0 BUCK 1, 2 PMOS 120 BUCK 1, 2 NMOS 50 20 140 BUCK 1, 2 PMOS 100 BUCK 3, 4 PMOS 160 RDS(ON) (mΩ) VOUT = 2.5V RDS(ON) (mΩ) EFFICIENCY (%) 80 Buck RDS(ON) vs VIN 200 250 22 21 20 19 18 17 VLDO = 1.2V 350 300 VLDO = 1.8V 250 200 VLDO = 3.3V 150 100 50 16 15 2.5 ILDO = 200mA 3 3.5 4 VIN (V) 4.5 5 5.5 3380 G16 0 –50 0 50 100 TEMPERATURE (°C) 150 3380 G17 Rev. B For more information www.analog.com 7 LT3380 TYPICAL PERFORMANCE CHARACTERISTICS LDO1 to LDO3 Dropout Voltage vs Temperature Buck Minimum Duty Cycle vs VIN 25 450 24 400 DROPOUT VOLTAGE (mV) DUTY CYCLE (%) 23 22 21 20 19 18 17 ILDO = 200mA VLDO = 1.2V 350 300 VLDO = 1.8V 250 200 VLDO = 3.3V 150 100 50 16 15 2.5 3 3.5 4 VIN (V) 4.5 5 0 –50 5.5 0 3380 G16 50 100 TEMPERATURE (°C) 150 3380 G17 LDO1 to LDO3 Short-Circuit Current vs Temperature LDO1 to LDO3 Load Step Response LDO SHORT-CIRCUIT CURRENT (mA) 800 750 700 VLDO = 1.8V 50mV/DIV 650 600 ILOAD = 220mA 550 100mA/DIV 500 10mA 450 400 CLDO = 1µF 350 300 –50 0 50 100 TEMPERATURE (°C) 10µs/DIV 3380 G19 150 3380 G18 8 Rev. B For more information www.analog.com LT3380 PIN FUNCTIONS FB_L2 (Pin 1): Feedback Input for LDO2. Set output voltage using a resistor divider connected from LDO2 to this pin to ground. VIN_L2 (Pin 2): Power Input for LDO2. This pin should be bypassed to ground with a 1μF or greater ceramic capacitor. Voltage on VIN_L2 should not exceed voltage on VIN pin. LDO2 (Pin 3): Output Voltage of LDO2. Nominal output voltage is set with a resistor feedback divider that servos to a fixed 725mV reference. This pin must be bypassed to ground with a 1µF or greater ceramic capacitor. DVDD (Pin 12): Supply Voltage for I2C Serial Port. This pin sets the logic reference level of SCL and SDA I2C pins. DVDD resets I2C registers to power-on state when driven to