Datasheet ADP1878, ADP1879 (Analog Devices) - 7

Data Sheet ADP1878/ADP1879 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 VIN = 13V IN = 16.5V ICI 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
004
10 100 1k 10k 100k
007
LOAD CURRENT (mA) LOAD CURRENT (mA)
09441- 09441- 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 V 50 IN = 13V 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
005
10 100 1k 10k 100k
008
LOAD CURRENT (mA) LOAD CURRENT (mA)
09441- 09441- 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
006
10 100 1k 10k 100k
009
LOAD CURRENT (mA) LOAD CURRENT (mA)
09441- 09441- Figure 6. Efficiency—300 kHz, VOUT = 7 V Figure 9. Efficiency—600 kHz, VOUT = 5 V Rev. B | Page 7 of 40 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Block Diagram Startup Soft Start Precision Enable Circuitry Undervoltage Lockout On-Board Low Dropout (LDO) Regulator Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier ADP1879 Power Saving Mode (PSM) Timer Operation Pseudo Fixed Frequency Power-Good Monitoring 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 Consideration Channel Conduction Loss MOSFET Driver Loss MOSFET Switching Loss Body 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 Application Circuits 12 A, 300 kHz High Current Application Circuit 5.5 V Input, 600 kHz Current Application Circuit 300 kHz High Current Application Circuit Packaging and Ordering Information Outline Dimensions Ordering Guide