Datenblatt-Suchmaschine für elektronische Bauteile |
|
MC34673 Datenblatt(PDF) 11 Page - Freescale Semiconductor, Inc |
|
MC34673 Datenblatt(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 22 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 34673 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The MC34673 is a fully-integrated Li-Ion and Li-Polymer battery charger in a tiny package. It uses current, voltage and temperature control loops to regulate the charge current. It has up to 28V input voltage rating, which makes the handheld device safe even when connected to a wrong AC adapter. The MC34673 requires only two external capacitors and one resistor to build a fully functional charger for space- limited applications such as PDAs, cell phones, portable video game players and digital still cameras. Its ultra high- accuracy ( ±0.7%) output voltage and temperature-limited charging current offer additional battery safety during charging. The CC-mode current can be programmed with an external resistor (RISET). The voltage across this resistor is proportional to the charge current, so the system can monitor the charge current during the whole charge cycle. The EOC current threshold is preset to 10% of the CC-mode current. For a deeply discharged battery with a voltage lower than 2.7V, the MC34673 charges the battery with a trickle-mode current, which is 20% of the CC-mode current. Three indication outputs make it easy to report the input power status and the charge status to MCUs, or users via LEDs. FUNCTIONAL PIN DESCRIPTION INPUT SUPPLY (VIN) The supply input. This pin should be bypassed to ground with a 1.0µF capacitor. POWER PRESENT INDICATOR (PPR) Open-drain logic output to indicate the input power status. The PPR-pin output is only determined by the input voltage, not other conditions such as the EN pin input. The output is low if VIN is higher than VPOR. This pin is capable to sink at least 12.0mA current to drive a LED indicator. CHARGE INDICATOR (CHG) Open-drain logic output to indicate the charge status. The output is low when the MC34673 is charging, until the EOC conditions are reached. This pin is capable to sink at least 12.0mA current to drive a LED indicator. ENABLE (EN) Active-low enable logic Input. This pin is internally pulled to ground by a weak current source. When left floating, the charger is enabled. Pulling this pin to high voltage externally disables the charger. GROUND (GND) Ground. FAST CHARGE INDICATOR (FAST) When charging, this open-drain logic output indicates whether or not the battery voltage is higher than the trickle- mode threshold. This pin is capable to sink more than 0.3mA current. When the charger is on, this pin outputs a logic low signal if the battery voltage is higher than the trickle-mode threshold. When the charger is in the shutdown mode or in any fault conditions, this pin outputs high-impedance. CC-MODE CURRENT SETTING AND CHARGE CURRENT MONITOR (ISET) The CC-mode current, ICHG, is programmed by connecting a resistor, RISET, between this pin and the ground. When charging in the CC-mode, the voltage at this pin is 1.0V. The voltage reduces proportionally as the charge current reduces in the CV-mode. During the whole charge cycle, the voltage at this pin can be used to monitor the charge current using the following equation: equ. 1 where IBAT is the actual charge current, ICHG is the programmed CC-mode current, and VISET is the voltage of the ISET pin during the whole charge cycle. CHARGER OUTPUT (BAT) Charger output pin. Connect this pin to the battery being charged. Bypass to ground with a 2.2µF or higher capacitor. EXPOSED PAD (EPAD) Exposed pad. Must be soldered on the large ground plane on the PCB to enhance the thermal conductivity. The pad must be connected to GND electrically. I BAT V ISET 1.0V --------------- I CHG ⋅ = |
Ähnliche Teilenummer - MC34673 |
|
Ähnliche Beschreibung - MC34673 |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |