Datasheet ADP1870, ADP1871 (Analog Devices) - 7

Data Sheet ADP1870/ADP1871 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 95 95 90 90 V 85 V IN = 13V IN = 13V (PSM) 85 80 80 75 75 70 70 VIN = 13V (PSM) 65 65 %) %) ( 60 ( 60 55 VIN = 16.5V 55 NCY 50 NCY E 50 E V 45 V IN = 16.5V ICI IN = 13V 45 ICI F 40 F 40 F F E 35 V T E 35 A = 25°C T IN = 16.5V (PSM) A = 25°C 30 V 30 OUT = 0.8V VOUT = 0.8V V 25 f 25 IN = 16.5V SW = 300kHz fSW = 600kHz (PSM) 20 20 15 WÜRTH INDUCTOR: WÜRTH INDUCTOR: 744325072, L = 0.72µH, DCR = 1.3mΩ 15 744355147, L = 0.47µH, DCR = 0.67mΩ 10 10 INFINEON FETs: INFINEON FETs: 5 BSC042N03MS G (UPPER/LOWER) 5 BSC042N03MS G (UPPER/LOWER) 0 0 10 100 1k 10k 100k
104
10 100 1k 10k 100k
107
LOAD CURRENT (mA) LOAD CURRENT (mA)
08730- 08730- Figure 4. Efficiency—300 kHz, VOUT = 0.8 V Figure 7. Efficiency—600 kHz, VOUT = 0.8 V
100 100 95 95 V 90 IN = 5V (PSM) 90 VIN = 13V 85 85 80 80 VIN = 13V (PSM) 75 75 70 70 65 VIN = 16.5V 65 %) V %) ( 60 IN = 13V (PSM) ( 60 55 55 NCY VIN = 13V 50 NCY E 50 E VIN = 16.5V 45 V ICI 45 ICI IN = 16.5V (PSM) F 40 V F 40 F IN = 16.5V (PSM) F E 35 T E 35 A = 25°C TA = 25°C 30 V 30 OUT = 1.8V VOUT = 1.8V 25 f 25 SW = 300kHz fSW = 600kHz 20 20 15 WÜRTH INDUCTOR: WÜRTH INDUCTOR: 744325120, L = 1.2µH, DCR = 1.8mΩ 15 744325072, L = 0.72µH, DCR = 1.3mΩ 10 10 INFINEON FETs: INFINEON FETs: 5 BSC042N03MS G (UPPER/LOWER) 5 BSC042N03MS G (UPPER/LOWER) 0 0 10 100 1k 10k 100k
105
10 100 1k 10k 100k
108
LOAD CURRENT (mA) LOAD CURRENT (mA)
08730- 08730- Figure 5. Efficiency—300 kHz, VOUT = 1.8 V Figure 8. Efficiency—600 kHz, VOUT = 1.8 V
100 100 95 VIN = 16.5V (PSM) 95 VIN = 13V (PSM) 90 90 VIN = 16.5V (PSM) 85 85 80 80 75 V 75 IN = 13V (PSM) 70 70 V 65 IN = 13V 65 %) %) ( 60 ( 60 VIN = 16.5V 55 V 55 NCY IN = 16.5V 50 NCY E 50 E VIN = 20V (PSM) 45 V ICI 45 ICI IN = 20V F 40 F 40 F F E 35 T E 35 A = 25°C TA = 25°C 30 V 30 OUT = 7V VOUT = 5V 25 f 25 SW = 300kHz fSW = 600kHz 20 20 15 WÜRTH INDUCTOR: WÜRTH INDUCTOR: 7443551200, L = 2.0µH, DCR = 2.6mΩ 15 744318180, L = 1.4µH, DCR = 3.2mΩ 10 10 INFINEON FETs: INFINEON FETs: 5 BSC042N03MS G (UPPER/LOWER) 5 BSC042N03MS G (UPPER/LOWER) 0 0 10 100 1k 10k 100k
106
10 100 1k 10k 100k
109
LOAD CURRENT (mA) LOAD CURRENT (mA)
08730- 08730- Figure 6. Efficiency—300 kHz, VOUT = 7 V Figure 9. Efficiency—600 kHz, VOUT = 5 V Rev. B | Page 7 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