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ML9077

Part Number	ML9077
Manufacturer	LAPIS
Description	Power-saving solar power supply control LSI
Published	May 8, 2014
Detailed Description	FEDL9077-02 Issue Date: Feb.20, 2013 ML9077 Power-saving solar power supply control LSI GENERAL DESCRIPTION ML9077 con...
Datasheet	ML9077 PDF File

Overview

FEDL9077-02 Issue Date: Feb.
20, 2013 ML9077 Power-saving solar power supply control LSI GENERAL DESCRIPTION ML9077 controls charging a solar power current to a rechargeable battery.
The control circuit is consists of a overcharge prevention circuit, a charge control circuit and a rechargeable battery voltage monitor circuit.
Each circuit performs following operation.
● Overcharge prevention circuit When a rechargeable battery becomes FULL charge state, the current of solar cell is drawn to VSS and the charge current for the rechargeable battery is omitted so that rechargeable battery voltage does not rise any more.
● Charge control circuit The voltage of solar cell (VSC) is always compared to the voltage of rechargeable battery (VBAT) and it will have starting to charge the battery if VSC＞VBAT, and stop to charge if VSC≦BAT.
● Rechargeable battery voltage monitor circuit（BOD : Brown-Out Detector） The voltage of rechargeable battery (VBAT) is always supervised, and it controls VBAT low voltage detection signal (VBOD) and rechargeable battery voltage output (VDO).
FEATURES • Self control the solar cell current for charging a rechargeable battery.
• Direct charge solar cell current (ISC) to a rechargeable battery.
− [VSC＞2.
0V, ISC≦1mA conditions]: Potential difference=Max 0.
1V （VSC-VBAT） − [VSC＞2.
0V, ISC≦1mA conditions]: Potential difference=Max 2.
0V （VSC-VBAT） • 2 Selectable overcharge prevention voltage.
• 2 Selectable low voltage detection voltage.
• Power supply system detects a low voltage of rechargeable battery and power off a external microcomputer.
• Low power operation − Solar cell current : 80nA − Rechargeable battery current : 80nA • Shipment − 1 2-pin plastic WQFN Part number: ML9077GDZ05B − Chip Part number: ML9077WA • Guaranteed operating range − Operating temperature: −20°C to 70°C − Operating voltage: VSC = 0.
0V to 3.
6V, VBAT = 0.
0V to 3.
2V 1/11 http://www.
Datasheet4U.
com FEDL9077-02 ML9077 BLOCK DIAGRAM ML9077 Block Diagram Figure 1 shows ML90...

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