Datasheet ADP1870, ADP1871 (Analog Devices) - 8

ADP1870/ADP1871 Data Sheet 100 0.807 95 0.806 90 VIN = 13V 85 0.805 80 0.804 75 ) 0.803 70 V ) ( 65 V 0.802 IN = 13V (PSM) E (% 60 G 0.801 Y A C 55 VIN = 16.5V LT 0.800 50 O IEN 45 V 0.799 IC T F 40 U 0.798 EF 35 T TP A = 25°C 0.797 30 VOUT = 0.8V V OU 25 IN = 16.5V (PSM) f 0.796 SW = 1.0MHz 20 0.795 15 WÜRTH INDUCTOR: VIN = 13V VIN = 16.5V 744303012, L = 0.12µH, DCR = 0.33mΩ 0.794 10 +125°C +125°C INFINEON FETs: +25°C +25°C 5 0.793 BSC042N03MS G (UPPER/LOWER) –40°C –40°C 0 0.792 10 100 1k 10k 100k
10 13 1
0 2000 4000 6000 8000 10,000
0 0- 0-
LOAD CURRENT (mA)
73
LOAD CURRENT (mA)
73 08 08 Figure 10. Efficiency—1.0 MHz, VOUT = 0.8 V Figure 13. Output Voltage Accuracy—300 kHz, VOUT = 0.8 V
100 1.821 95 V 90 IN = 13V 85 1.816 80 V 75 IN = 13V (PSM) ) 70 1.811 V ) ( 65 E (% 60 G Y A 1.806 C 55 LT 50 O IEN 45 V IC VIN = 16.5V T 1.801 F 40 V U IN = 16.5V (PSM) EF 35 T TP A = 25°C 30 VOUT = 1.8V OU 1.796 25 fSW = 1.0MHz 20 V V V 15 WÜRTH INDUCTOR: IN = 5.5V IN = 13V IN = 16.5V 744303022, L = 0.22µH, DCR = 0.33mΩ 1.791 +125°C +125°C +125°C 10 INFINEON FETs: +25°C +25°C +25°C 5 BSC042N03MS G (UPPER/LOWER) –40°C –40°C –40°C 0 1.786 10 100 1k 10k 100k
11 14 1
0 1500 3000 4500 6000 7500 9000 10,500 12,000 13,500 15,000
0 0- 0-
LOAD CURRENT (mA)
73
LOAD CURRENT (mA)
73 08 08 Figure 11. Efficiency—1.0 MHz, VOUT = 1.8 V Figure 14. Output Voltage Accuracy—300 kHz, VOUT = 1.8 V
100 7.100 95 7.095 90 7.090 85 V 7.085 80 IN = 13V (PSM) 7.080 75 7.075 ) 70 V 7.070 ) ( 65 E 7.065 (% 60 G 7.060 Y A C 55 V 7.055 IN = 16.5V (PSM) VIN = 13V LT 50 O 7.050 IEN 45 V IC VIN = 16.5V 7.045 T F 40 U 7.040 EF 35 T TP 7.035 A = 25°C 30 V 7.030 OUT = 5V OU 25 f 7.025 SW = 1.0MHz 20 7.020 15 WÜRTH INDUCTOR: 7.015 744355090, L = 0.9µH, DCR = 1.6mΩ 10 +125°C INFINEON FETs: 7.010 VIN = 13V 5 +25°C BSC042N03MS G (UPPER/LOWER) 7.005 –40°C VIN = 16.5V 0 7.000 10 100 1k 10k 100k
12 15 1
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
0 0- 0-
LOAD CURRENT (mA)
73
LOAD CURRENT (mA)
73 08 08 Figure 12. Efficiency—1.0 MHz, VOUT = 5 V Figure 15. Output Voltage Accuracy—300 kHz, VOUT = 7 V Rev. B | Page 8 of 44 Document Outline Features Applications General Description Typical Applications Circuit Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics ADP1870/ADP1871 Block Diagram Theory of Operation Startup Soft Start Precision Enable Circuitry Undervoltage Lockout On-Board Low Dropout Regulator Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier Power Saving Mode (PSM) Version (ADP1871) Timer Operation Pseudo-Fixed Frequency Applications Information Feedback Resistor Divider Inductor Selection Output Ripple Voltage (ΔVRR) Output Capacitor Selection Compensation Network Output Filter Impedance (ZFILT) Error Amplifier Output Impedance (ZCOMP) Error Amplifier Gain (GM) Current-Sense Loop Gain (GCS) Crossover Frequency Efficiency Considerations Channel Conduction Loss MOSFET Driver Loss Switching Loss Diode Conduction Loss Inductor Loss Input Capacitor Selection Thermal Considerations Design Example Input Capacitor Inductor Current Limit Programming Output Capacitor Feedback Resistor Network Setup Compensation Network Loss Calculations External Component Recommendations Layout Considerations IC Section (Left Side of Evaluation Board) Power Section Differential Sensing Typical Applications Circuits 15 A, 300 kHz High Current Application Circuit 5.5 V Input, 600 kHz Application Circuit 300 kHz High Current Application Circuit Outline Dimensions Ordering Guide