N-RC SAMTEC, 2SN-BK-G PART DESCRIPTION MANUFACTURER/PART NUMBER DO NOT INSTALL RES, CHIP, 0 jumper, 1/16W, 0402 40V 400mA SYNCHRONOUS STEP-DOWN BATTERY CHARGER, 3mm x 3mmQFN16 CAP, CHIP, X5R, 47F, 10%, 16V, 1210 CAP, CHIP, X5R, 47F, 10%, 16V, 1210 MURATA, GRM32ER61C476KE15L MURATA, GRM32ER61C476KE15L PART DESCRIPTION MANUFACTURER/PART NUMBER RES, CHIP, 1.40M, 1%, 1/16W, 0402 RES, CHIP, 1.05M, 1%, 1/16W, 0402 40V, 400mA SYNCHRONOUS STEP-DOWN BATTERY CHARGER, 3mm x 3mmQFN16 CAP, CHIP, X5R, 47F, 10%, 16V, 1210 VISHAY, CRCW04021M40FKE VISHAY, CRCW04021M05FKED LINEAR TECH., LTC4121EUD#PB VISHAY, CRCW04020000Z0E LINEAR TECH., LTC4121EUD-4.2#PBF MURATA, GRM32ER61C476KE15L dc1977afb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent ri

for the ADP1870. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 GM = 500 A/V X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 08730-078 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 80. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. 1 (A/V) ACS x RON where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sections). RON is the cha

for the ADP1882. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 X5R (16V) -80 GM = 500 A/V 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 DC VOLTAGE (VDC) Current-Sense Loop Gain (GCS) 30 08901-079 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 80. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. 1 (A/V) ACS x RON where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sections). RON is the cha

to be 1/4th of the crossover frequency for the ADP1878. -20 -30 -40 Error Amplifier Gain (Gm) -50 X5R (25V) -60 -70 Gm = 500 A/V (s) X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 The error amplifier gain (transconductance) is 0 5 10 15 20 DC VOLTAGE (VDC) 25 Current-Sense Loop Gain (GCS) 30 09441-082 CAPACITANCE CHARGE (%) 0 -10 The current-sense loop gain is 1 Figure 82. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, mount several MLCCs in parallel with the electrolytic capacitors to reduce the overall series resistance. where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sec

for the ADP1872. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 X5R (16V) -80 GM = 500 A/V 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 08297-078 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 79. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. COMPENSATION NETWORK Due to its current-mode architecture, the ADP1872/ADP1873 require Type II compensation. To determine the component values needed for compensation (resistance and capacitance va

106KA12L GRM21BR60J226ME39L GRM219R60J226M**** GRM31CR61E226KE15L GRM31CR61C226KE15L GRM31CR61A226KE19L GRM31CR60J226KE19L GRM32ER61E226KE15L GRM32ER61C226KE20L GRM32NR61A226KE19L GRM32ER61A226KA65L GRM21BR60G476ME15L GRM31CR61A476ME15L GRM31CR60J476ME19L GRM32ER61C476KE15L GRM32ER61A476KE20L GRM31CR60J107ME39L GRM32ER60J107ME20L Available Available Available Available 09Q4 Available 09Q4 Available Available Available 09Q4 Available Available Available Available Available Available Available Available Available 09Q4 Available Available Available Available Available Available Available Available 09Q4 Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Mass Mass Mass Mass Production Production Production Production Production 10Q1 Production Production Production Production 10Q1 Mass Production 10Q1 Mass Production Mass Production Mass Production 10Q1 Mass Production Mass Production Mass Production Mas

lifier Gain (Gm) -50 X5R (25V) The error amplifier gain (transconductance) is -60 Gm = 500 A/V (s) -70 X5R (16V) -80 Current-Sense Loop Gain (GCS) 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 DC VOLTAGE (VDC) 30 The current-sense loop gain is 09441-082 CAPACITANCE CHARGE (%) = = Figure 82. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors 1 ( ) x Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, mount several MLCCs in parallel with the electrolytic capacitors to reduce the overall series resistance. where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sections). RON is the channel impedance of the low-side MOSFET. COMPENSATION

the ADP1874. -30 -40 -50 Error Amplifier Gain (Gm) X5R (25V) -60 The error amplifier gain (transconductance) is -70 X5R (16V) -80 Gm = 500 A/V (s) 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 09347-078 CAPACITANCE CHARGE (%) 0 The current-sense loop-gain is Figure 86. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, several MLCCs should be mounted in parallel with the electrolytic capacitors to reduce the overall series resistance. COMPENSATION NETWORK Due to its current-mode architecture, the ADP1874/ADP1875 require Type II compensation. To determine the component values needed for compensation (resistance and capacitance val

to be 1/4th of the crossover frequency for the ADP1878. -20 -30 -40 Error Amplifier Gain (Gm) -50 X5R (25V) -60 -70 Gm = 500 A/V (s) X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 The error amplifier gain (transconductance) is 0 5 10 15 20 DC VOLTAGE (VDC) 25 Current-Sense Loop Gain (GCS) 30 The current-sense loop gain is 09441-082 CAPACITANCE CHARGE (%) 0 -10 1 Figure 82. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, mount several MLCCs in parallel with the electrolytic capacitors to reduce the overall series resistance. where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sec

for the ADP1870. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 GM = 500 A/V X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 08730-078 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 80. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. COMPENSATION NETWORK Due to their current-mode architecture, the ADP1870/ADP1871 require Type II compensation. To determine the component values needed for compensation (resistance and capacitance

for the ADP1872. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 X5R (16V) -80 GM = 500 A/V 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 08297-078 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 79. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. COMPENSATION NETWORK Due to its current-mode architecture, the ADP1872/ADP1873 require Type II compensation. To determine the component values needed for compensation (resistance and capacitance va

for the ADP1870. -30 -40 Error Amplifier Gain (GM) -50 X5R (25V) -60 The error amplifier gain (transconductance) is -70 GM = 500 A/V X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 08730-078 CAPACITANCE CHARGE (%) 0 The current-sense loop gain is G CS = Figure 80. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. Because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, when using electrolytic capacitors, several MLCCs should be mounted in parallel to reduce the overall series resistance. COMPENSATION NETWORK Due to their current-mode architecture, the ADP1870/ADP1871 require Type II compensation. To determine the component values needed for compensation (resistance and capacitance

C, and 85C). 12. Frequency is selected considering efficiency and output voltage ripple. 13. 100F (GRM31CR60J107ME39L) ceramic and 470F (4TPE470MCL) are selected for output capacitors in the evaluation board. 14. 3 x 470F (6TPF470MAH) and 6 x 47F ceramic (GRM32ER61C476KE15L) are used for input capacitors in the evaluation board. FN8837 Rev. 2.00 Jan 29, 2018 Page 8 of 73 ZL9024M 1. Overview Table 3. Recommended Input and Output Capacitors Vendor Value Part Number 470 F, 6.3V, 2917 6TPF470MAH Murata, Input Cap 47 F, 16V, 1210 GRM32ER61C476KE15L Murata, Input Cap 47 F, 6.3V, 1210 GRM32ER70J476ME20 Panasonic, Input Cap Taiyo Yuden, Input Ceramic 47 F, 16V, 1210 EMK325BJ476MM-T Murata, Output Ceramic 100 F, 6.3V, 1210 GRM31CR60J107ME39L TDK, Output Ceramic 100 F, 6.3V, 1210 C3225X5R0J107M FN8837 Rev. 2.00 Jan 29, 2018 Page 9 of 73 ZL9024M 2. 2. Specifications Specifications 2.1 Absolute Maximum Ratings Parameter Minimum Maximum Unit Input Supply Voltage, VIN Pin -0.3 17 V Input Supply Vo

to be 1/4th of the crossover frequency for the ADP1878. -20 -30 -40 Error Amplifier Gain (Gm) -50 X5R (25V) -60 -70 Gm = 500 A/V (s) X5R (16V) -80 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 The error amplifier gain (transconductance) is 0 5 10 15 20 DC VOLTAGE (VDC) 25 Current-Sense Loop Gain (GCS) 30 09441-082 CAPACITANCE CHARGE (%) 0 -10 The current-sense loop gain is 1 Figure 82. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, mount several MLCCs in parallel with the electrolytic capacitors to reduce the overall series resistance. where: ACS (V/V) is programmable for 3 V/V, 6 V/V, 12 V/V, and 24 V/V (see the Programming Resistor (RES) Detect Circuit and Valley Current-Limit Setting sec

t to be 1/4 the crossover frequency for the ADP1874. -30 -40 -50 -70 The error amplifier gain (transconductance) is X5R (16V) -80 Gm = 500 A/V (s) 10F TDK 25V, X7R, 1210 C3225X7R1E106M 22F MURATA 25V, X7R, 1210 GRM32ER71E226KE15L 47F MURATA 16V, X5R, 1210 GRM32ER61C476KE15L -90 -100 Error Amplifier Gain (Gm) X5R (25V) -60 0 5 10 15 20 25 Current-Sense Loop Gain (GCS) 30 DC VOLTAGE (VDC) 09347-078 CAPACITANCE CHARGE (%) and X7R (50V) 0 The current-sense loop-gain is G CS = Figure 86. Capacitance vs. DC Voltage Characteristics for Ceramic Capacitors Electrolytic capacitors satisfy the bulk capacitance requirements for most high current applications. However, because the ESR of electrolytic capacitors is much higher than that of ceramic capacitors, several MLCCs should be mounted in parallel with the electrolytic capacitors to reduce the overall series resistance. COMPENSATION NETWORK Due to its current-mode architecture, the ADP1874/ADP1875 require Type II compensation. To determine the component v