NCP1422 ON Semiconductor, NCP1422 Datasheet
NCP1422
Available stocks
Related parts for NCP1422
NCP1422 Summary of contents
Page 1
... Step−Up DC−DC Converter with True−Cutoff and Ring−Killer NCP1422 is a monolithic micropower high−frequency step−up switching converter IC specially designed for battery−operated hand−held electronic products up to 800 mA loading. It integrates Sync−Rect to improve efficiency and to eliminate the external Schottky Diode. High switching frequency (up to 1.2 MHz) allows for a low profile, small− ...
Page 2
... V Chip Enable − PFM REF Voltage Reference 5 1. LBI/EN − 2 NCP1422 ZLC + − TRUE CUTOFF CONTROL CONTROL LOGIC _ZCUR _TSDON V DD _MSON _MAINSW2ON GND _CEN _PFM _MAINSWOFD _SYNSW2ON _SYNSWOFD _V REFOK _ILIM + − + GND Figure 1. Detailed Block Diagram http://onsemi.com ...
Page 3
... The maximum package power dissipation limit must not be exceeded. T J(max qJA 3. Latchup Current Maximum Rating: ±150 mA per JEDEC standard: JESD78. 4. Moisture Sensitivity Level: MSL 1 per IPC/JEDEC standard: J−STD−020A. 5. Measured on approximately 1x1 inch sq oz. Copper. NCP1422 Description is < 1.20 V. LBO is high impedance in LBI = 3.3 V. OUT Symbol ...
Page 4
... EN Pin Shutdown Threshold (T = 25°C) A Thermal Shutdown Temperature (Note 8) Thermal Shutdown Hysteresis (Note 8) 6. Loading capability increases with V OUT. 7. Design guarantee, value depends on voltage Values are design guaranteed. NCP1422 = 25°C for typical value, −40° 3 OUT A Symbol V V OUT ...
Page 5
... AMBIENT TEMPERATURE, T Figure 4. Reference Voltage vs. Temperature 1.0 0.9 0.8 0.7 0.6 0.5 −40 − AMBIENT TEMPERATURE, T Figure 6. L Switch Max. ON Time vs. Temperature X NCP1422 1.220 REF 2.0 V REF T = 25°C 1.210 A 1.200 1.190 1.180 100 1000 1.5 2 /mA Figure 3 ...
Page 6
... BATTERY INPUT VOLTAGE, V Figure 10. Battery Input Voltage vs. Output Ripple Voltage 15 12.5 10 7.5 5.0 2.5 1.5 2.0 2.5 3.0 3.5 INPUT VOLTAGE AT OUT PIN, V Figure 12. No Load Operating Current vs. Input Voltage at OUT Pin NCP1422 2 5.0 V OUT − OUT T = 25_C A −10 ...
Page 7
... OUT LOAD Upper Trace: Output Voltage Ripple, 200 mV/Division Lower Trace: Load Current 500 mA/Division LOAD Figure 18. Load Transient Response For V NCP1422 ( OUT Upper Trace: Output Voltage Ripple, 20 mV/Division Lower Trace: Voltage at LX pin, 1.0 V/Division Figure 15. Continuous Conduction Mode = 1 2.5 V ...
Page 8
... NCP1422 is a monolithic micropower high−frequency step−up voltage switching converter IC specially designed for battery operated hand−held electronic products up to 800 mA loading. It integrates a Synchronous Rectifier to improve efficiency as well as to eliminate the external Schottky diode. High switching frequency (up to 1.2 MHz) allows for a low profile inductor and output capacitor to be used. Low− ...
Page 9
... If REF is loaded, a 1.0 mF capacitor at the REF pin is needed. True−Cutoff The NCP1422 has a True−Cutoff function controlled by the multi−function pin LBI/EN (pin 2). Internal circuitry can isolate the current through the body diode of switch M2 to load. Thus, it can eliminate leakage current from the battery to load in shutdown mode and significantly reduce battery current consumption during shutdown ...
Page 10
... R3 and R4. The relationship is given by 1.20 V where R3 and R4 are the upper and lower divider resistors respectively. Inductor Selection The NCP1422 is tested to produce optimum performance with a 5.6 mH inductor 2.5 V and V IN supplying an output current up to 800 mA. For other input/output requirements, inductance in the range can be used according to end application specifications ...
Page 11
... The following is a simple method based on the basic first−order equations to estimate the inductor and capacitor values for NCP1422 to operate in Continuous Conduction Mode (CCM). The set component values can be used as a starting point to fine tune the application circuit performance ...
Page 12
... Practically, a capacitor that is one level larger is used to accommodate factors not taken into account in the calculations. Therefore, a capacitor value selected. The NCP1422 is internally compensated for most applications, but in case additional compensation 12 10 ...
Page 13
... A B BOTTOM VIEW 0.05 C NOTE 3 10X 0.5651 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. NCP1422 PACKAGE DIMENSIONS DFN10 3mm, 0.5mm Pitch CASE 485C−01 ISSUE EDGE OF PACKAGE L1 ...
Page 14
... USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 14 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP1422/D ...