NCP1835B ON Semiconductor, NCP1835B Datasheet
NCP1835B
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NCP1835B Summary of contents
Page 1
... The NCP1835B can charge from a standard wall adapter or from the USB port. It has been optimized to charge low capacity batteries such as those found in wireless headsets and flash memory− ...
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... The full charge current (I For best accuracy, a resistor with 1% tolerance is recommended. 9 VSNS Battery voltage sense pin. Connect this as close as possible to the battery input connection. Charge current output. A minimum 4.7 mF capacitor is needed for stability when the battery is not attached. 10 BAT NCP1835B CFLG EN V2P8 VSNS FAULT BAT V ...
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... PCB that has 1 single signal layer with the additional 3 solid ground or power planes. The maximum package power dissipation limit must not be exceeded: T J(max qJA with R = 68.5°C/ 100°C, P qJA J(max) 4. Moisture Sensitivity Level per IPC/JEDEC standard: J−STD−020A. NCP1835B Symbol V FAULT is highly dependent on the PCB heatsink area. For example, R qJA = 1. http://onsemi.com 3 Value Unit www ...
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... CFLG Pin Recommended Maximum Operating Voltage FAULT Pin Recommended Maximum Operating Voltage CFLG Pin Sink Current (V = 0.8 V) CFLG FAULT Pin Sink Current (V = 0.8 V) FAULT 5. Guaranteed by design. Not tested in production. NCP1835B = 5.0 V and room temperature, maximum and minimum values CHG = 2 2 2.7 MW 3.7 V) ...
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... CC V floating BAT 4.00 −50 − AMBIENT TEMPERATURE (°C) A Figure 4. Regulated Output Voltage vs. Temperature 3. 2.95 I V2P8 2.90 2.85 2.80 2.75 2.70 4.5 Figure 6. V2P8 Voltage vs. Input Voltage NCP1835B 4.30 4.25 4.20 4.15 4.10 4.05 4.00 0.24 0.3 4.5 Figure 3. Regulated Output Voltage (floating) vs. 0.80 0.78 0.76 0.74 0. 3.7 V BAT 0.70 75 100 125 4.5 Figure 5. ISEL Voltage vs. Input Voltage floating BAT = 270 k ISEL = 0 5 ...
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... ISEL 0 −50 − AMBIENT TEMPERATURE (°C) A Figure 9. Trickle Charge Current vs. Temperature 4.10 4.05 4.00 3.95 3.90 4.5 5.0 5 INPUT VOLTAGE (V) CC Figure 11. Recharge Voltage vs. Input Voltage NCP1835B 3 BAT R = 270 k ISEL V = 3.7 V BAT 0 5.1 5.3 5.5 4.5 Figure 8. Trickle Charge Current vs. Input Voltage 400 350 300 250 ...
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... Once the cell voltage crosses the pre−charge threshold, the device will transition to normal (full−rate) charging at 100% of the programmed full rate charge current (I As the NCP1835B charges the battery, the cell voltage rises until it reaches the V maximum charge rate, it normally takes about 1 hour to reach this point from a fully discharged state, and the battery will be approximately 70− ...
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... 1/8 TIMEOUT? Constant Y Trickle Current Charge Charge Set FAULT Low Latch Up Charger N EN Toggled? Y End−of−Charge or FAULT Figure 13. Charging Flow Chart NCP1835B Charging Flow Chart CC Charge ≥ SNS REG TIMEOUT Constant Voltage Charge EOC Indication; Set CFLG High ...
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... I charge I PC CFLG FAULT V2P8 0 Table 1. Charge Status Condition Trickle, Constant Current and Constant Voltage Charge End−of−Charge or Shutdown Mode Timeout Fault, V < 0. > 1.4 V ISEL ISEL NCP1835B CC CV End of Charge Charge Charge Inhibit V V REG REG V RECH I CHG I EOC 2 ...
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... This voltage can also be used to power a microprocessor I/O. NCP1835B Enable/Disable (EN) Pulling the EN pin to GND disables the NCP1835B. In shutdown mode, the internal reference, oscillator, and control circuits are all turned off. This reduces the battery drain current to less than 3.0 mA and the input supply current ...
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... A 4 higher value ceramic capacitor is recommended for the input bypass capacitor. For the output capacitor, when there is no battery inserted and the NCP1835B is used as an LDO with 4 4.242 V output voltage higher value tantalum capacitor is recommended for stability. With the battery attached, the output capacitor can be any type with the value higher than 0 ...
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... The copper pad is the primary heatsink and should be connected to as much top layer metal as possible to minimize the thermal impedance. Figure 18 illustrates graphically the recommended connection for the exposed pad with vias. The following is a NCP1835B Demo Board Schematic and suggested Bill of Materials (T8) R4 ...
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... Table 3. Bill of Materials Item Qty. Part Description 1 1 NCP1835B Integrated Li−Ion Charger (DFN−10) Chip Resistor " (0603 Chip Resistor "1% 2.67 MW (0603 Chip Resistor "1% 100 kW (0603 Chip Resistor "1% 1.0 kW (0603 Chip Resistor "1% 432 W (0603) ...
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... 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 3.31 0.130 1.65 0.065 2.50 0.098 0.630 0.025 mm SCALE 10:1 inches ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP1835B/D ...