LTC7106IDDB-1#TRPBF

LTC7106 A 7-Bit Current DAC with PMBus Interface FEATURES DESCRIPTION ±0.8% IDAC Positive Output Current Accuracy (Over Temp) nn ±1.5% I DAC Negative Output Current Accuracy (Over Temp) nn PMBus/I2C Compliant Serial Interface nn Input Voltage Range: 2.5V to 5.5V nn High Impedance at IDAC Output When Disabled nn Wide IDAC Operation Voltage (0.4V to 2.0V) nn 7-Bit Programmable DAC Output Current for DC/DC VOUT Control nn Wide Range IDAC Output Current: ±16μA to ±256μA nn Programmable Slew Rate: 500ns ~ 3ms per Bit nn Available in a 10-Lead (3mm × 2mm) DFN Package The LTC®7106 is a precision, PMBus controlled, bidirectional current digital-to-analog converter that adjusts the output voltage of any conventional VFB referenced regulator. The LTC7106 can work with the vast majority of power management controllers or regulators to enable digital control of the output voltage. Internal power-on reset circuitry keeps the DAC output current at zero (high impedance IDAC) until a valid write takes place. Features include a range bit for easy interfacing to almost any impedance resistor divider, and an open-drain GPO output for controlling the Run or Enable pin of the DC/ DC regulator. For most applications, the current DAC error is significantly attenuated with proper design. See more detail about VOUT accuracy in the Applications Information section of this data sheet. The LTC7106 is supported by the ADI LTpowerPlay® development tool with graphical user interface (GUI). nn APPLICATIONS General Purpose Power Systems Telecom Systems nn Industrial Applications nn All registered trademarks and trademarks are the property of their respective owners. nn TYPICAL APPLICATION Margin High and Margin Low L1 VIN SW VIN RFB1 DC/DC VFB CIRCUIT OF FIGURE 11 VOUT VREF C2 330µF (0.4V to 2V) VOUT 5V/DIV IDAC = –40μA IDAC = 0μA RFB2 RUN VOUT = 24V IDAC = 40μA VDD 2.5V TO 5.5V R4 10k SDA PMBus INTERFACE EN 2V/DIV 0μA TO 63μA C1 1µF SCL ALERT 10k R3 10k R2 10k R1 VDD EN GPO 100ms/DIV 7106 TA01b –64μA TO 0μA SDA SCL LTC7106 ALERT IDAC GND ASEL0 ASEL1 7106 TA01a VDD Rev A Document Feedback For more information www.analog.com 1 LTC7106 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION All Pins Except GND................................... –0.3V to 6.0V Operating Junction Temperature Range.... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C TOP VIEW SDA 1 10 ASEL1 SCL 2 9 ASEL0 VDD 3 8 GPO ALERT 4 7 EN GND 5 6 IDAC DDB PACKAGE 10-LEAD (3mm × 2mm) PLASTIC DFN θJA = 55°C/W, θJC = 16.8°C/W ORDER INFORMATION http://www.linear.com/product/LTC7106#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7106EDDB#PBF LTC7106EDDB#TRPBF LHCG 10-Lead (3mm × 2mm) Plastic DFN –40°C to 125°C LTC7106IDDB#PBF LTC7106IDDB#TRPBF LHCG 10-Lead (3mm × 2mm) Plastic DFN –40°C to 125°C Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. 2 Rev A For more information www.analog.com LTC7106 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), VDD = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN VDD Power Supply IQ Supply Quiescent Current EN High ISHUTDOWN Supply Quiescent Current EN = 0V 800 μA VUVLO_R Undervoltage Rising Threshold VDD Rising 2.35 V VUVLO_F Undervoltage Falling Threshold VDD Falling 2.15 V VEN_R Enable Rising Threshold VEN Rising VEN_F Enable Falling Threshold VEN Falling Accuracy Full Scale Positive 0.4 ≤ VIDAC ≤ 2V (Note 3) 2.5 TYP MAX UNITS   5.5 V 700 1400 μA 1.35 0.8 V V IDAC_OUT IDAC Full Scale Negative 0.4 ≤ VIDAC ≤ 2V (Note 3) LSB 0.4 ≤ VIDAC ≤ 2V Range = Normal l 62.5 63 63.5 μA Range = Low l 15.5 15.75 16.0 μA Range = High l Range = Normal (0°C to 85°C) 246.7 252.00 255.3 μA –64.64 –64 –63.36 μA Range = Normal l –64.96 –64 –63.04 μA Range = Low l –16.36 –16 –15.64 μA Range = High l –262.50 –256 –249.50 Range = Normal Range = Low Range = High INL 0.4 ≤ VIDAC ≤ 2V DNL IHZ 0.4 ≤ VIDAC ≤ 2V High-Z Current 0.4 ≤ VIDAC ≤ 2V μA 0.25 μA 4 Range = Normal μA 1 μA –1 1 LSB Range = Low –1.5 1.5 LSB Range = High –1.6 1.6 LSB Range = Normal –0.3 0.3 LSB Range = Low –0.5 0.5 LSB Range = High –0.8 0.8 LSB 20 nA 1.4 V 10 pF 0.4 V VEN = 0 l Digital Input: SDA, SCL VIH VIL CPIN 0.8 Input Capacitance V Open-Drain Outputs: ALERTB, GPO, SDA VOL Output Low Voltage ISINK = 3mA Rev A For more information www.analog.com 3 LTC7106 PMBus INTERFACE TIMING CHARACTERISTICS l denotes the specifications which The apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VDD = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fSCL Serial Bus Operating Frequency 10 tBUF Bus Free Time Between Stop and Start Condition 1.3 400 kHz µs tHD_SDA Hold Time After (Repeated) Start Condition 0.6 µs tSU_SDA Repeated Start Condition Setup Time 0.6 µs tSU_STO Stop Condition Setup Time 0.6 µs tHD_DAT(OUT) Data Hold Time 300 tHD_DAT(IN) Input Data Hold Time tSU_DAT 900 ns 0 ns Data Setup Time 100 ns tLOW Clock Low Period 1.3 tHIGH Clock High Period 0.6 tTIMEOUT_SMB Stuck PMBus Timer 3 900 IDAC LEAKAGE (nA) IQ (μA) 850 800 750 700 650 600 PIDAC Full Full-Scale vs Temperature PIDAC Scale VS. Temperature 63.500 VEN = 0, OR VID[6:0] = 0 63.400 63.200 63.100 1 63.000 62.900 62.800 0 62.700 550 62.600 –10 30 70 TEMP (°C) 110 150 7106 G01 4 VID[6:0] = 0111111 63.300 2 IDAC IRANGE = NOMINAL ms TA = 25°C, VDD = 3.3V, VIDAC = 1.0V, Range = Normal unless otherwise noted. IDAC Leakage Current vs Temperature IDAC Leakage Current vs. Temp Quiescent Current vs Temperature 500 –50 µs is derated for junction temperatures greater than 125°C. 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. TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 55°C/W). Note 3: IDAC is a bidirectional current DAC, controlled by 2’s complementary logic. Under the setting of Range = Normal, IDAC = 63µA for Code = 0111111 provides the maximum source current and IDAC = –64µA for Code = 1000000 provides the maximum sink current. Max sink current generates the Highest VOUT, while Max source current generates the lowest VOUT. See the Operation section for more details. TYPICAL PERFORMANCE CHARACTERISTICS 950 µs 30 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 LTC7106 is tested under pulsed load conditions such that TJ ≈ TA. The LTC7106E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC7106I is guaranteed over the –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime 1000 10000 –1 –50 –5 40 85 TEMPERATURE (°C) 130 7106 G02 62.500 –50 –10 30 70 TEMPERATURE (°C) 110 150 7106 G03 Rev A For more information www.analog.com LTC7106 TYPICAL PERFORMANCE CHARACTERISTICS NIDAC vs Temperature Differential Nonlinearity Integral Nonlinearity Integral Non–Linearity 0.15 0.06 0.12 –63.70 0.02 0.09 –63.80 –0.02 0.06 –63.90 –0.06 0.03 VID[6:0] = 1000000 DNL (LSB) –63.60 –64.00 –64.10 INL (LSB) 0.10 –63.50 IDAC (µA) TA = 25°C, VDD = 3.3V, Range = Normal unless otherwise noted. –0.10 –0.14 0 –0.03 –64.20 –0.18 –0.06 –64.30 –0.22 –0.09 –64.40 –0.26 –0.12 –64.50 –50 –0.30 0 50 TEMPERATURE (°C) 100 150 1 7 0 10 20 7106 G05 7106 G04 Buck Start-Up with IDAC LTC7106 + LTM4636 VOUT = 1V –0.15 13 20 26 32 38 44 51 57 63 CODE 30 40 CODE 50 60 70 7106 G06 Margin High and Margin Low LTC7106 + LTM4636 VOUT = 1V IDAC = –60µA IDAC = –60μA IDAC = 60µA VOUT 0.3V/DIV VOUT 200mV/DIV IDAC = 0μA IDAC = 0µA GPO 5V/DIV 7106 G07 10mV/DIV EN 2V/DIV 100ms/DIV Boost Start-Up with IDAC LTC7106 + LTC3784 VOUT = 24V VIN = 12V IDAC = 60μA 7106 G08 Margin High and Margin Low IDAC = –40μA LTC7106 + LTC3784 IDAC = 0μA IDAC = 40μA VOUT 10V/DIV VOUT 5V/DIV IDAC = 0μA VOUT = 24V IDAC = –40μA IDAC = 0μA IDAC = 40μA GPO 5V/DIV 2ms/DIV 7106 G09 EN 2V/DIV 100ms/DIV 7106 G10 Rev A For more information www.analog.com 5 LTC7106 PIN FUNCTIONS VDD (Pin 3): Input Supply. Bypass this pin to GND with a capacitor (0.1µF to 1µF). GPO (Pin 8): Open-Drain Digital Output. A pull-up resistor to VDD is required. IDAC (Pin 6): Bidirectional Current DAC Output. ALERT (Pin 4): Open-Drain Digital Output. A pull-up resistor to VDD is required. EN (Pin 7): Chip Enable Pin. Current DAC output is in Hi-Z state when EN is Grounded. Do not leave EN floating. SDA (Pin 1): Serial Bus Data Input and Open-Drain Output. A pull-up resistor to VDD is required in the application. SCL (Pin 2): Serial Bus Clock Input. 6 ASEL1/ASEL0 (Pins 10, 9): Serial Bus Address Select Inputs. Each pin has three states (VDD, FLOATING and GND); these two pins provide 9 addresses. GND (Pin 5): Ground. Rev A For more information www.analog.com LTC7106 BLOCK DIAGRAM EN VDD RANGE SDA SLEW RATE VID[6:0] PMBus INTERFACE SCL IDAC 7-BIT IDAC ALERT VREF + – ASEL0 ASEL1 ADDRESS ADC R1 GPO GND 7106 BD Rev A For more information www.analog.com 7 LTC7106 OPERATION The LTC7106 is a PMBus controlled 7-bit D/A converter current source. Through its PMBus interface, the LTC7106 receives a 7-bit DAC code and converts this value to a bidirectional analog output current through the pin IDAC. By connecting IDAC to the feedback node of a voltage regulator, IDAC can change the output voltage of the regulator with the equation: VOUT = VREF • (1 + RFB1/RFB2) – IDAC • RFB1 where VREF is the reference voltage of the voltage regulator. RFB1 and RFB2 are the resistor divider for the voltage regulator. IDAC is the programmed bidirectional current shown in Table 2. A typical application diagram is shown on the front page. Therefore, the traditional pure analog designed oriented PWM controller can be controlled by a PMBus interface. This illustrates the flexibility of the LTC7106 providing a PMBus interface to conventional analog DC/DC converters. CHIP ENABLE (EN PIN) The LTC7106 is activated by the EN pin. It turns on/off the device with threshold of 1.2V. When EN is low ( 5.5V, THEN OPERATE AS SHOWN 22µF 16V ×5 100µF 25V PVCC INTVCC PVCC VIN 115k INTVCC 22pF PVCC RUNC 0.1µF HIZREG LTM4636 470µF ×3 FREQ 34.8k VOUTS1- TRACK/SS 4.7µF 100µF 6.3V x4 VOUTS1+ RUNP INTVCC VOUT 1.2V, 40A VOUT MODE/PLLIN VFB SNSP1 SNSP2 4.99k COMPA COMPB PINS NOT USED IN THIS CIRCUIT: CLKOUT,GMON, PGOOD,PHMODE,PWM, SW,TEST1,TEST2,TEST3,TEST4,TMON TEMP+ TEMP– SGND PGND OPTIONAL TEMP MONITOR VDD 160μA TO MARGIN HIGH VOUT FROM 1.2V TO 2V 2.5V TO 5.5V 1µF 10k 10k 10k 10k VDD SDA SCL PMBus INTERFACE ALERT GPO EN SDA SCL ALERT GPO GND LTC7106 ASEL0 IDAC ASEL1 7106 F10 Figure 10. Using the LTC7106 to Margin High μModule LTM4636 Providing 1.2V to 2.0V at 40A 20 Rev A For more information www.analog.com LTC7106 APPLICATIONS INFORMATION Case Three design criteria in Case One, we can choose RTOP = 200kΩ and RBOT = 8.97kΩ for the best accuracy. Then IDAC = (28V – 18V)/200kΩ = +50µA. Choose MFR_CONTROL [6:5] = 00 (Range Nominal) to set IDAC LSB = 1µA. By looking in Table 2, choose DAC[6:0] = 0001110 to set the IDAC = +50μA, which will margin VOUT from 28V to 18V. The LTC7106 can also work with boost converters. In this case, the LTC3784, a synchronous boost controller, provides a 2-phase 28V/10A output and requires to control VOUT from 28V to 18V (see Figure 11). The VFB is 1.2V and the voltage dividers are external. Based on the same 4mΩ 3.3μH 47µF SENSE1+ SENSE1– VBATT BG1 VBIAS BOOST1 12V DOWN TO 2.3V AFTER START-UP IF VBIAS IS POWERED FROM VOUT 0.1µF VOUT 28V AT 10A SW1 LTC3784 TG1 4mΩ INTVCC 3.3μH 220µF 4.7µF SENSE2+ 100k SENSE2– BG2 PGOOD INTVCC FREQ BOOST2 OVMODE MODE/PLLIN ITH VDD 100pF SS SGND PGND 8.97k 0.1µF 2.5V TO 5.5V 1µF 10k 10k 10k +50µA TO MARGIN LOW VOUT FROM 28V TO 18V 10k VDD SDA PMBus INTERFACE 200k VFB 15nF 8.66k 0.1µF SW2 TG2 SCL ALERT GPO EN SDA SCL ALERT GPO GND LTC7106 ASEL0 IDAC ASEL1 7106 F11 Figure 11. Using the LTC7106 with a Boost Controller to Vary VOUT from 28V to 18V Rev A For more information www.analog.com 21 LTC7106 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTC7106#packaging for the most recent package drawings. DDB Package 10-Lead Plastic DFN (3mm × 2mm) (Reference LTC DWG # 05-08-1722 Rev Ø) 0.64 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 2.39 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ±0.10 (2 SIDES) R = 0.05 TYP R = 0.115 TYP 6 0.40 ±0.10 10 2.00 ±0.10 (2 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF 0.75 ±0.05 0 – 0.05 0.64 ±0.05 (2 SIDES) 5 0.25 ±0.05 PIN 1 R = 0.20 OR 0.25 × 45° CHAMFER 1 (DDB10) DFN 0905 REV Ø 0.50 BSC 2.39 ±0.05 (2 SIDES) BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE M0-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 22 Rev A For more information www.analog.com LTC7106 REVISION HISTORY REV DATE DESCRIPTION A 04/18 Clarified MFG_RAIL_ADDRESS and MFG_SPECIAL_ID paragraphs Changed from “Status Word” to “Status Byte” PAGE NUMBER 15 16 Rev A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license For is granted implication or otherwise under any patent or patent rights of Analog Devices. more by information www.analog.com 23 LTC7106 TYPICAL APPLICATION 1µH VIN 3.4V TO 22V (42V TRANSIENT) VIN 4.7µF EN/UV BIAS LT8640S RT VDD EXTERNAL SOURCE >3.1V 1µF OR GND 10pF 6.04k 100µF 1210 X5R/X7R FB 17.8k 6.98k GND fSW = 2MHz L: XEL6030 2.5V TO 5.5V VOUT 1.8V 6A SW 0µA TO 50µA 1µF 10k 10k 10k 10k VDD SDA SCL PMBus INTERFACE ALERT GPO EN SDA SCL LTC7106 ALERT GPO GND ASEL0 IDAC ASEL1 7106 F12 Figure 12. Margining a LT8640S from 1.8V to 1.5V at 6A RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC3605/LTC3605A 20V, 5A Synchronous Step-Down Regulator 4V < VIN < 20V, 0.6V < VOUT < 20V, 96% Maximum Efficiency, 4mm × 4mm QFN-24 Package LTC3626 20V, 2.5A Synchronous Step-Down Regulator with Current 95% Efficiency, VIN: 3.6V to 20V, VOUT(MIN) = 0.6V, IQ = 300µA, and Temperature Monitoring ISD < 15µA, 3mm × 4mm QFN-20 LTC3636 20V, Dual 6A Synchronous Step-Down Regulator 95% Efficiency, VIN: 3.1V to 17V, VOUT(MIN) = 0.6V, IQ < 8µA (Both Channels Enabled), ISD < 1µA, 3mm × 5mm QFN-24 Package LTC3779 150V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller 4.5V ≤ VIN ≤ 150V, Input or Output Average Current Loop, PLL, TSSOP-38 Package LTC3784 Low IQ, Multiphase, Dual Channel Single Output Synchronous Step-Up DC/DC Controller 4.5V (Down to 2.5V After Start-Up) ≤ VIN ≤ 60V, VOUT Up to 60V, PLL Fixed Frequency 50kHz to 900kHz , IQ = 28µA LTC3807 38V, Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 24V, IQ = 50µA LTC3871 100V Bidirectional PolyPhase® Buck or Boost Controller Dynamic Regulation of VIN, VOUT and Current, PLL, Current Monitor, 48-Lead LQPF Package LTM®4636 40A DC/DC µModule Step-Down Regulator Complete 40A Switch Mode Power Supply, 4.75V ≤ VIN ≤ 15V, 0.6V ≤ VOUT ≤ 3.3V, 16mm × 16mm × 7.12mm BGA LTC7150S 20V, 20A Synchronous Step-Down Regulator 93% Efficiency, VIN: 3.1V to 20V, VOUT(MIN) = 0.6V, Output Remote Sense, 42-Lead 6mm × 5mm × 1.3mm BGA Package LT®8640S 42V, 6A Synchronous Step-Down Silent Switcher®2 IQ = 2.5µA, VIN(MIN) = 3.4V, VOUT(MAX) = 42V, VOUT(MIN) = 0 24 Rev A D16851-0-4/18(A) For more information www.analog.com www.analog.com © ANALOG DEVICES, INC. 2017-2018