LTC4415 - Dual 4A Ideal Diodes with Adjustable …

1 LTC4415 . Dual 4A Ideal Diodes with Adjustable Current Limit Features Description n Dual 50m Monolithic Ideal Diodes The LTC 4415 contains two monolithic PowerPath Ideal n to Operating Range Diodes , each capable of supplying up to 4A with typical n Up to 4A Adjustable Current Limit for Each diode forward conduction resistance of 50m . The diode voltage n Low Reverse Leakage Current (1 A Max) drops are regulated to 15mV during forward conduction at n 15mV Forward Drop in Regulation low currents, extending the power supply operating range n Smooth Switchover in diode ORing and ensuring no oscillations during supply switchover. n Load Current Monitor Less than 1 A of reverse current flows from OUT to IN. n Precision Enable Thresholds to Set Switchover making this device well suited for power supply ORing n Soft-Start to Limit Inrush Current on Start-Up applications . n Status Pins to Indicate Forward diode Conduction n The two Ideal Diodes are independently enabled and Current and Thermal Limit with Warning n prioritized using inputs EN1 and EN2.

2 The output current Thermally Enhanced 16-Lead MSOP and DFN. limits can be adjusted independently from to 4A. (3mm 5mm) Packages using resistors on the CLIM pins. Furthermore, the Ideal diode currents can be monitored via CLIM pin voltages. applications Open-drain status pins indicate when the Ideal Diodes are n High Current PowerPath Switch forward conducting. When the die temperature approaches n Battery and Wall Adapter diode ORing thermal shutdown, or if the output load exceeds the cur- n Backup Battery diode ORing rent limit threshold, the corresponding warning pins are n Logic Controlled High Current Power Switch pulled low. n Supercapacitor ORing L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the n Multiple Battery Sharing property of their respective owners. Typical Application Forward Characteristics of LTC4415 .

3 Prioritized Power Supply ORing vs MBRS410E Schottky CURRENT LIMIT. PRIMARY Ideal 4. IN1 OUT1 TO. POWER. LOAD. SOURCE 100k F LTC4415 . LTC4415 . LOAD CURRENT (A). 3. EN1 SCHOTTKY. CLIM1 STAT1 diode . CLIM2 WARN1 MBRS410E. 2. 124 124 WARN2. STAT2 RON = 50m . EN2 1. Ideal . IN2 OUT2. SECONDARY + 4415 TA01a POWER. SOURCE GND 0. 0 100 200 300 400 500. FORWARD VOLTAGE DROP (mV). 4415 TA01b 4415fa 1. LTC4415 . Absolute Maximum Ratings (Note 1). IN1, IN2, OUT1, OUT2, CLIM1, CLIM2, Storage Temperature 65 C to 150 C. STAT1, STAT2, WARN1, WARN2 to 6V Peak Reflow 260 C. EN1, EN2 to Max (VINx, VOUTx). Operating Junction Temperature Range (Notes 3, 4).. 40 C to 125 C. Pin Configuration TOP VIEW. IN1* 1 16 OUT1*. IN1* 2 15 OUT1* TOP VIEW. EN1 3 14 STAT1 IN1* 1 16 OUT1*. IN1* 2 15 OUT1*. CLIM1 4 13 WARN1 EN1 3 14 STAT1. 17. CLIM1 4 17 13 WARN1. CLIM2 5 GND 12 WARN2 5. CLIM2 GND 12 WARN2. EN2 6 11 STAT2. EN2 6 11 STAT2 IN2* 7 10 OUT2*.

4 IN2* 7 10 OUT2* IN2* 8 9 OUT2*. IN2* 8 9 OUT2* MSE PACKAGE. 16-LEAD PLASTIC MSOP. TJMAX = 125 C, JA = 35 C/W TO 40 C/W. DHC PACKAGE. EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB. VARIATION A. *ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER INTERNALLY. 16-LEAD (5mm 3mm) PLASTIC DFN. TJMAX = 125 C, JA = 43 C/W. EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB. *ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER. Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE. LTC4415 EDHC#PBF LTC4415 EDHC#TRPBF 4415 16-Lead (5mm 3mm) Plastic DFN 40 C to 125 C. LTC4415 IDHC#PBF LTC4415 IDHC#TRPBF 4415 16-Lead (5mm 3mm) Plastic DFN 40 C to 125 C. LTC4415 EMSE#PBF LTC4415 EMSE#TRPBF 4415 16-Lead Plastic MSOP 40 C to 125 C. LTC4415 IMSE#PBF LTC4415 IMSE#TRPBF 4415 16-Lead Plastic MSOP 40 C to 125 C. Consult LTC Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: 4415fa 2. LTC4415 . Electrical The Characteristics l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25 C (Notes 2, 3). VIN1 = VIN2 = , RCLIM = 250 , unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VIN1, VOUT1, Operating Supply Range At Least One Input/Output Must Be in This Range l V. VIN2, VOUT2. VUVLO Undervoltage Lockout VINx Rising l V. Hysteresis 55 mV. IQF Quiescent Current In Forward Regulation VIN1 = VEN1 = VEN2 = , IOUT1 = 1mA, l 44 80 A. (Note 5) VIN2 = VOUT2 = 0V, Measured Through GND Pin IQOFF Quiescent Current In Shutdown VIN1 = VIN2 = VEN2 = , VEN1 = 0V, l 13 28 A.

6 VOUT1 = VOUT2 = 0V, Measured Through GND Pin IQR(OUT) Reverse Turn-Off Current: OUT1 VIN1 = , VOUT1 = , VIN2 = , VOUT2 = l 18 40 A. OUT2 (VOUT1 > VOUT2) l 5 11 A. IQR(IN) INx Pin Current In Reverse Turn-Off VOUT1 = VOUT2 = l 4 10 A. ILEAK(IN) INx Pin Leakage Current VIN1 = VIN2 = 0V, VOUT1 = VOUT2 = 1 1 A. VFR Forward Regulation Voltage (VINx VOUTx) IOUTx = 1mA l 5 15 25 mV. VRTO Reverse Turn-Off Voltage (VINx VOUTx) l 50 30 10 mV. RFR Forward Dynamic Resistance in IOUTx = 100mA to 300mA 18 30 m . Regulation RON On-Resistance in Constant Resistance IOUTx = 1A 50 70 m . Mode tON PowerPath Turn-On Time (Notes 6, 7) Before Enable VOUT1 = , diode 1 10 s Before Enable VOUT2 = , diode 2 23 s Before Enable VOUTx = 0V 250 s tON(SD) PowerPath Turn-On from Shutdown Both Diodes Disabled and VOUTx = Before Enable 70 s (Note 7) Both Diodes Disabled and VOUTx = 0V Before Enable 320 s tSWITCH PowerPath Switchover Time VINx ( to ) to VOUTx Starts Rising, Both 9 s Diodes Enabled, OUT1 and OUT2 Tied Together tOFF PowerPath Turn-Off Time Disable to IIN Falling from 100mA to 1mA 2 s tSS Soft-Start Duration (Note 8) VOUTx = 0V 2 ms Current Monitor Current Monitor Ratio ICLIMx /IOUTx When IOUTx = 4A 1 mA/A.

7 ICLIMx /IOUTx When IOUTx = 2A 1 mA/A. Current Limit VCLIM CLIM Clamp Voltage In Current Limit V. ILIM(ADJ) Current Limit Adjustability l 4 A. Accuracy of Adjustable Current Limit VOUTx = VINx , Current Limit = 4A l 8 %. Threshold VOUTx = VINx , Current Limit = 2A l 15 %. ILIM(INT) Internal Current Limit RCLIMx = 0 , VOUTx = 0V l 4 6 9 A. TWARN Thermal Warning Threshold Rising Temperature 130 C. Hysteresis 15 C. TSD Thermal Shutdown Threshold Rising Temperature 160 C. Hysteresis 20 C. Open-Drain Status Outputs (STAT1, WARN1, STAT2, WARN2). VOL Open-Drain Output Low Voltage Current Into Open-Drain Output = 3mA l V. Open-Drain Output High Leakage Current Open-Drain Output Voltage = l 0 1 A. tSTAT(ON) STAT Turn-On Time (Note 6) EN1 Rising to STAT1 Pull-Down 5 s EN2 Falling to STAT2 Pull-Down 18 s 4415fa 3. LTC4415 . Electrical The Characteristics l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25 C (Notes 2, 3).

8 VIN1 = VIN2 = , RCLIM = 250 , unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. tSTAT(OFF) STAT Turn-Off Time Disable to STAT Pull-Up 2 s tWARN(ON) WARN Turn-On Time Current Limit to WARN Pull-Down 500 s tWARN(OFF) WARN Turn-Off Time Out of Current Limit to WARN Pull-Up 5 s Enable Inputs (EN1, EN2). VENTH EN1 Rising and EN2 Falling Thresholds l 760 800 840 mV. VENHYST EN1 and EN2 Hysteresis 55 mV. Enable Pin Current When Pulled High VEN1 = VEN2 = l 0 1 A. Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 4: The LTC4415 includes overtemperature protection that is intended may cause permanent damage to the device. Exposure to any Absolute to protect the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperature will exceed 125 C when overtemperature protection is active. reliability and lifetime. Continuous operation above the specified maximum operating junction Note 2: Unless otherwise specified, current into a pin is positive and temperature may impair device reliability.

9 Current out of a pin is negative. Note 5: One channel enabled. Quiescent current is identical for each Note 3: The LTC4415 is tested under pulsed load conditions such that channel. TJ TA. The LTC4415E is guaranteed to meet performance specifications Note 6: Enable inputs are driven to supply levels. Other diode is already from 0 C to 85 C. Specifications over the 40 C to 125 C operating enabled so the chip bias circuits are active. junction temperature range are assured by design, characterization and Note 7: Turn-on time is measured from enable to IOUTx rising through correlation with statistical process controls. The LTC4415I is guaranteed 1mA. When the output voltage is more than , soft-start is disabled and over the full 40 C to 125 C operating junction temperature range. turn-on is faster. The junction temperature (TJ in C) is calculated from the ambient Note 8: Current ramps from zero to the current limit during the soft-start temperature (TA in C) and power dissipation (PD in Watts) according to duration.

10 Soft-start is measured from 10% to 90% of the current limit. If the formula: the load condition is such that the current does not need to go up to the TJ = TA + (PD JA) current limit during start-up, the output voltage may reach steady state Note that the maximum ambient temperature consistent with these sooner. specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. Typical Performance Characteristics TA = 25 C, VIN1 = VIN2 = , RCLIM = 250 unless otherwise noted. I-V Characteristics On-Resistance vs Temperature On-Resistance vs VIN. 4 80 80. RCLIM = 124 . 70 70. 3. FORWARD CURRENT (A). 60 60. RON (m ). RON (m ). 2 50 50. 40 40. 1 125 C. 90 C 30 30. 25 C. 40 C. 0 20 20. 0 50 100 150 200 250 50 25 0 25 50 75 100 125 150 1 2 3 4 5 6. FORWARD VOLTAGE DROP (mV) TEMPERATURE ( C) INPUT VOLTAGE (V). 4415 G01 4415 G02 4415 G03.