Datasheet ADP1850 (Analog Devices) - 10

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ADP1850 Data Sheet SW1 OUTPUT RESPONSE 1 1 PGOOD1 VCCO (CH3) 8A TO 13A STEP LOAD 2 VOUT, PRELOADED (CH4) 3 4 VIN = 12V VOUT = 3.3V 4
011
CH1 20mV B CH1 10V CH2 2V M10ms A CH2 3.76V
014
W M200µs A CH4 11.5A CH4 5A Ω
09440-
CH3 2V CH4 2V Ω
09440- Figure 10. Step Load Transient of Figure 44 Figure 13. Thermal Shutdown Waveform
0.5 REFERENCED AT VIN = 2.75V 0 DH1 1 %) –0.5 DL1 ( 2 f SW 600kHz N I –1.0 VOUT1 E 300kHz –1.5 3 IL1 CHANG 4 VIN = 12V –2.0 VOUT = 1.8V OUTPUT PRECHARGED TO 1V 850kHz –2.5 CH1 5V CH2 5V M1ms A CH1 2.4V
012
3 5 7 9 11 13 15 17 19 21
015
CH3 1V CH4 1A Ω
09440-
VIN (V)
09440- Figure 11. Soft Start into Precharged Output Figure 14. Change in fSW vs. VIN
2.0 VIN = 12V; REFERENCED AT 25°C 1.5 1.0 1 SW %) 0.5 ( VOUT (CH3) f SW 0 N I E –0.5 –1.0 CHANG EN SS (CH4) –1.5 3 2 4 –2.0 CSS = 100nF –2.5 CH1 10V CH2 2V M10ms A CH2 1.52V
013
–40 –15 10 35 60 85 110 135
016
CH3 1V CH4 1V
09440-
TEMPERATURE (°C)
09440- Figure 12. Enable Start-Up Function Figure 15. fSW vs. Temperature Rev. C | Page 10 of 32 Document Outline Features Applications General Description Typical Operation Circuit Revision History Specifications Absolute Maximum Ratings ESD Caution Simplified Block Diagram Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Architecture Oscillator Frequency Modes of Operation Synchronization Synchronous Rectifier and Dead Time Input Undervoltage Lockout Internal Linear Regulator Overvoltage Protection Power Good Short-Circuit and Current-Limit Protection Shutdown Control Thermal Overload Protection Applications Information Setting the Output Voltage Soft Start Setting the Current Limit Accurate Current-Limit Sensing Setting the Slope Compensation Setting the Current Sense Gain Input Capacitor Selection Input Filter Boost Capacitor Selection Inductor Selection Output Capacitor Selection MOSFET Selection Loop Compensation (Single Phase Operation) Configuration and Loop Compensation (Dual-Phase Operation) Switching Noise and Overshoot Reduction Voltage Tracking Coincident Tracking Ratiometric Tracking Indepdendent Power Stage Input Voltage PCB Layout Guidelines MOSFETs, Input Bulk Capacitor, and Bypass Capacitor High Current and Current Sense Paths Signal Paths PGND Plane Feedback and Current-Limit Sense Paths Switch Node Gate Driver Paths Output Capacitors Typical Operating Circuits Outline Dimensions Ordering Guide