Datasheet ADP1872, ADP1873 (Analog Devices) - 10

ADP1872/ADP1873 Data Sheet 335 340 V +125°C NO LOAD DD = 5.5V VIN = 5.5V +125°C 325 +25°C V +25°C DD = 3.6V 325 V –40°C IN = 13V –40°C VIN = 16.5V 315 310 305 ) 295 ) Hz 295 Hz k k ( 280 ( Y 285 Y NC NC 265 275 UE UE Q Q 250 265 E RE R F F 235 255 245 220 235 205 225 190
2
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
25 02
0 2000 4000 6000 8000 10,000 12,000 14,000 16,000
0 7- 7-
V
29
IN (V)
29
LOAD CURRENT (mA)
08 08 Figure 22. Switching Frequency vs. High Input Voltage, Figure 25. Frequency vs. Load Current, 300 kHz, VOUT = 0.8 V 300 kHz, ±10% of 12 V
650 360 V +125°C NO LOAD DD = 5.5V VIN = 5.5V +125°C +25°C V +25°C DD = 3.6V 350 VIN = 13V –40°C –40°C VIN = 16.5V 600 340 ) 330 ) Hz Hz k 550 k ( 320 ( Y Y NC NC 310 UE UE Q 500 Q 300 E RE R F F 290 450 280 270 400 260
3 26
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 12,000 14,000 16,000 18,000 20,000
0 7- 7-
V
29
IN (V)
29
LOAD CURRENT (mA)
08 08 Figure 23. Switching Frequency vs. High Input Voltage, Figure 26. Frequency vs. Load Current, 300 kHz, VOUT = 1.8 V 600 kHz, VOUT = 1.8 V, ±10% of 12 V
1000 358 V +125°C DD = 5.5V NO LOAD V +125°C 354 IN = 13V +25°C V V +25°C 950 DD = 3.6V IN = 16.5V –40°C 350 –40°C 346 900 342 338 ) ) 850 Hz 334 Hz k k ( ( 330 Y 800 Y 326 NC NC 322 UE 750 UE Q Q 318 E RE R 314 F 700 F 310 650 306 302 600 298 294 550 290
4 27
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
0 800 1600 2400 3200 4000 4800 5600 6400 7200 8000 8800 9600
0 7- 7-
V
29
IN (V)
29
LOAD CURRENT (mA)
08 08 Figure 24. Switching Frequency vs. High Input Voltage, Figure 27. Frequency vs. Load Current, 300 kHz, VOUT = 7 V 1.0 MHz, ±10% of 12 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 ADP1872/ADP1873 Block Digram Theory of Operation Startup Soft Start Precision Enable Circuitry Undervoltage Lockout Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier Power Saving Mode (PSM) Version (ADP1873) 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 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 Dual-Input, 300 kHz High Current Application Circuit Single-Input, 600 kHz Application Circuit Dual-Input, 300 kHz High Current Application Circuit Outline Dimensions Ordering Guide