Datasheet ADP1878, ADP1879 (Analog Devices) - 10

ADP1878/ADP1879 Data Sheet 601.0 900 +125°C +25°C 880 600.5 –40°C V ) REG = 5V, VIN = 20V z 860 ) 600.0 H k (V ( 840 E Y C 599.5 AG N T E 820 L V U REG = 5V, VIN = 13V O Q 599.0 E 800 G FR 780 598.5 IN DBACK V H E C 760 E F IT 598.0 W S 740 597.5 720 597.0 700
2 5
–40.0 –7.5 25.0 57.5 90.0 122.5
02 -02
13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5
1- 41
TEMPERATURE (°C) V
44 094
IN (V)
09 Figure 22. Feedback Voltage vs. Temperature Figure 25. Switching Frequency vs. High Input Voltage, 1.0 MHz, VIN Range = 13 V to 16.5 V
325 280 +125°C NO LOAD VIN = 13V +125°C +25°C V +25°C IN = 20V –40°C –40°C 315 V 265 IN = 16.5V ) z H k ( 305 Y ) C 250 N Hz E k U 295 ( Q E NCY 235 285 UE G FR Q IN H RE F 220 C 275 IT W S 205 265 255
3
190
6
10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2
02
0 2000 4000 6000 8000 10,000
-02 1- 41
V
44
IN (V) LOAD CURRENT (mA)
09 094 Figure 23. Switching Frequency vs. High Input Voltage, 300 kHz, ±10% of 12 V Figure 26. Frequency vs. Load Current, 300 kHz, VOUT = 0.8 V
650 330 +125°C NO LOAD VIN = 20V +125°C +25°C V +25°C IN = 13V –40°C 320 –40°C VIN = 16.5V ) z 600 H 310 k ( Y ) C 300 N Hz E 550 k U ( 290 Q E NCY UE 280 G FR 500 Q IN H RE F 270 C IT W 260 S 450 250 400
4
240
7
13.0 13.4 13.8 14.2 14.6 15.0 15.4 15.8 16.2
02
0 1500 3000 4500 6000 7500 9000 10,500 12,000 13,500 15,000
-02 1- 41
V
44
IN (V) LOAD CURRENT (mA)
09 094 Figure 24. Switching Frequency vs. High Input Voltage, 600 kHz, VOUT = 1.8 V, Figure 27. Frequency vs. Load Current, 300 kHz, VOUT = 1.8 V VIN Range = 13 V to 16.5 V Rev. B | Page 10 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