ncp1509 ON Semiconductor, ncp1509 Datasheet
ncp1509
Available stocks
Related parts for ncp1509
ncp1509 Summary of contents
Page 1
... MHz (nominal) oscillator for the PWM circuitry can be synchronized to an external 500 kHz to 1000 kHz clock signal. Finally, it includes an integrated soft−start, cycle−by−cycle current limiting, and thermal shutdown protection. The NCP1509 is available in a space saving, low profile 3x3 mm 10 pin DFN package. Features • ...
Page 2
... V Selection Pin. This pin contains a pullup resistor. out Enable for Switching Regulator. This pin is active high to turn on the NCP1509. This pin contains an internal pulldown resistor. Synchronization input for the PWM converter clock signal is present, the converter uses the rising edge for the turn on of the PFET. If this pin is low, the converter is in Low Iq Pulse mode ...
Page 3
MAXIMUM RATINGS Rating Maximum Voltage All Pins Maximum Operating Voltage All Pins Thermal Resistance, Junction−to−Air Operating Ambient Temperature Range ESD Withstand Voltage Moisture Sensitivity Storage Temperature Range Junction Operating Temperature Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings ...
Page 4
ELECTRICAL CHARACTERISTICS (V mode –30 to 85°C for Min/Max values, unless otherwise noted. A Characteristic V Pin CC Quiescent Current of SYNC Mode out Quiescent Current of PWM Mode out ...
Page 5
ELECTRICAL CHARACTERISTICS mode –30 to 85°C for Min/Max values, unless otherwise noted. A Characteristic SYNC PWM Mode Characteristics (continued) Feedback Voltage Accuracy, V Set = 1. out I = 300 mA out Feedback Voltage Accuracy, V ...
Page 6
V 1.57 V out out 60 1. 100 200 300 I (mA) out Figure 4. Efficiency vs. Output Current in PWM Mode 100 2 ...
Page 7
1.5 V out 25°C A PWM (mA) out Figure 10. Input Current Comparison 40 1.8 V out 30 1.57 ...
Page 8
1.5 V out PWM 1 25° 0 0.2 0.4 0.6 0.8 V (V) SHD Figure 16. Output Voltage vs. Shutdown Pin Voltage 1 ms/div Figure 18. ...
Page 9
Figure 22. Line Transient Response Figure 24. Output Voltage Transition Figure 23. Load Transient Response from 1. 1.8 V http://onsemi.com 9 ...
Page 10
... Switching will continue when the output voltage falls below the threshold of OVP comparator. Pulsed Mode (PM) Under light load conditions (< 30 mA), NCP1509 can be configured to enter a low current pulsed mode operation to reduce power consumption. This is accomplished by SYNC pin held LOW. The output regulation is implemented by pulse frequency modulation ...
Page 11
... From Figure 21, it show the soft−start time is about 1.5 ms. Shutdown Mode When the SHD pin has a voltage applied of less than 0.4 V, the NCP1509 will be disabled. In shutdown mode, the internal reference, oscillator and most of the control circuitries are turned off. Therefore, the typical current consumption will be 0.1 mA (typical value). ...
Page 12
... NCP1509 in most of applications. For example, with TDK C2012X5R0J226 output capacitor, the output ripple is less than 300 mA. Design Example As a design example, assume that the NCP1509 is used in a single lithium−ion battery application. The input voltage 3 4.2 V. Output condition typical load current of 120 mA and a maximum of 300 mA ...
Page 13
... RF circuits. Interference with noise sensitive circuitry in the DC−DC converter can be reduced by distance between them. Figure 26. Soldermask Top and Silkscreen Layer The following shows NCP1509 demo board layout and suggested bill of materials. Figure 25. Top and Silkscreen Layer http://onsemi.com ...
Page 14
Table 3. Bill of Materials Component Value C 10 mF, X5R, 6 mF, X5R, 6.3 V out L 6.8 mH *Output current calculated from **Calculated output current from V = 4.2 ...
Page 15
... G 0.50 BSC 0.020 BSC H 1.23 1.28 0.048 0.050 J 0.20 REF 0.008 REF K 0.00 0.05 0.000 0.002 L 0.35 0.45 0.014 0.018 M 1.50 BSC 0.059 BSC N 1.50 BSC 0.059 BSC P 0.88 0.93 0.035 0.037 R 0.60 0.80 0.024 0.031 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCP1509/D ...