Datasheet ADP172 (Analog Devices) - 9

Data Sheet ADP172 –30 70 3V –40 60 50 –50 ) V µ B) ( d 40 E 1.8V –60 IS RR ( 300mA S 200mA NO P 30 S 100mA –70 10mA RM 0.8V 1mA 20 –80 10 –90 0 10 100 1k 10k 100k 1M 10M
170
0.001 0.01 0.1 1 10 100 1000
20 1- 0
FREQUENCY (Hz)
1- 11
LOAD CURRENT (mA)
11 06 06 Figure 15. Power Supply Rejection Ratio vs. Frequency, VOUT = 3.0 V Figure 18. RMS Noise vs. Load Current and Output Voltage
–30 3V, 1mA 1.8V, 1mA ILOAD 0.8V, 1mA –40 3V, 300mA 1mA TO 300mA LOAD STEP, 1.8V, 300mA 2.5A/µs 1 0.8V, 300mA –50 B) d ( –60 RR S VOUT P 2 –70 –80 VIN = 3.6V VOUT = 1.8V –90
8 1
10 100 1k 10k 100k 1M 10M
11
CH1 200mA Ω CH2 50.0mV BW M40.00µs A CH1 124mA
12 1- 1-
FREQUENCY (Hz)
11
T 160.680µs
611 06 0 Figure 16. Power Supply Rejection Ratio vs. Frequency, Various Output Figure 19. Load Transient Response, CIN and COUT = 1 μF Voltages and Load Currents
10 ILOAD 1mA TO 300mA LOAD STEP, 2.5A/µs 1 ) 1 √Hz V/ µ 0.8V E ( 1.8V IS 3.0V O VOUT N 2 0.1 VIN = 3.6V V I IN = 3.6V LOAD = 10mA VOUT = 1.8V COUT = 1µF 0.01
2 9
CH1 200mA Ω CH2 50.0mV B
12
10 100 1k 10k 100k W M40.0µs A CH1 204mA
01 1- 1-
T 159.800µs FREQUENCY (Hz)
11 611 0 06 Figure 17. Output Noise Spectrum Figure 20. Load Transient Response, CIN and COUT = 4.7 μF Rev. E | Page 9 of 20 Document Outline Features Applications Typical Application Circuits General Description Table of Contents Revision History Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Undervoltage Lockout Enable Feature Current Limit and Thermal Overload Protection Thermal Considerations Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide