MB3790 Fujitsu Media Devices, MB3790 Datasheet
MB3790
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MB3790 Summary of contents
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... MB3790 DESCRIPTION The MB3790 is designed to control power supplies to SRAM, logic IC, or other circuit devices and protects them against momentary power failures by using backup batteries. In addition to its function to supply the power to these devices, it has a function to switch the source of power to the primary or secondary backup battery when the power supply voltage drops below a predetermined level ...
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... MB3790 (Continued) • On-chip power-on reset circuit • Primary battery voltage-down detection levels: 2.65 V, 2.37 V • On-chip secondary battery recharging function • Output current during battery backup: V • Leakage current: 0.5 A [Max] PIN ASSIGNMENTS (TOP VIEW) N. BAT1 V 3 OUT V 4 OUT ...
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... BLOCK DIAGRAM V IN CONTROL 590 k V SENSE 240 k GND DataSheet4U.com 4 DataSheet U .com R = 0.5 ON Reference voltage power 1.24 V supply circuit + DataSheet4U.com MB3790 100 SBD 500 2. OUT OUT BAT2 BAT1 V OUT ALARM1 ALARM2 ...
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... MB3790 PIN DESCRIPTION Pin number Symbol 16P 20P — ALARM1 7 9 ALARM2 8 10 GND 9 11 RESET 10 12 RESET 11 13 — 14 13 CONTROL DataSheet4U.com 4 4 DataSheet U .com I/O N.C. — Non connection ...
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... A), this function determines T ( [Typ]) PO INL MB3790 ), the device outputs a current of INH pin. OUT , the device switches the source of power for V INL SENSE , the device recharges the secondary battery using OUT pin. When 5 ...
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... MB3790 DESCRIPTION OF OPERATION 1. Operation When the Input Voltage Goes On or Off OUT RESET RESET (1) Power-on While the power supply voltage is less than V are in the standby mode with the power supplied by the battery. When the power supply voltage rises to a level greater than or equal to V output pins turns on and the power for such devices is supplied from the V battery voltage detection and the secondary battery recharging operations are actuated ...
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... DataSheet U .com . (4.2 V Typ) as the power supply goes down or its INL DataSheet4U.com (1) (1) (2) BAT1 (2.65 V Typ), the ALARM1 pin is forced to a Low level to issue an alarm BAT1 (2.37 V Typ), the ALARM2 pin is forced to a Low level to issue BAT2 MB3790 DV BAT1 DV BAT2 V BATH1 V BATL1 V BATH2 V BATL2 ( greater than or equal ...
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... MB3790 ABSOLUTE MAXIMUM RATINGS Parameter Input voltage Battery voltage Reset output Voltage Alarm output Voltage Output current Output high current Output low current Power dissipation Storage temperature * : When mounted cm-square double-side epoxy board. WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc ...
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... OLR OLR BAT1 1000 1000 100 slew rate < 0 pdR IN MB3790 ( + Value Unit Min Typ Max — 50 100 — 0 — 100 300 — 2 4.10 4.20 4.30 4.05 4.20 4.35 4.20 4 ...
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... MB3790 (Continued) Parameter Low voltage detection 1 Low voltage detection-1 hysteresis width Low voltage detection 2 Battery-1 Monitoring Low voltage detection-2 Section hysteresis width Low voltage detection difference Battery-1 input current Battery-1 output voltage difference during backup, CTL = GND Alarm output voltage ...
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... Rise/Fall Times on Reset and Alarm Pins: t ALARM1 ALARM2 2. Reset Pulse Width RESET DataSheet4U.com 4 DataSheet U .com / 90% RESET RESET 10 Input Pulse Width Reset Output Delay Time DataSheet4U.com pdR MB3790 90% 10 pdR V INH V INL t pdR BAT1 B2 11 ...
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... MB3790 3. Alarm Output delay time: t ALARM1 ALARM2 4. V Output Delay Time: t OUT DataSheet4U.com 12 4 DataSheet U .com pdA 50mV BATL1, BATL2 BAT1 50mV t pdA ro 5V DataSheet4U.com OUT t ro 98% ...
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... DataSheet U .com OPEN IN V =+3V BAT1 -0.4 -0.6 -0.8 -1.0 Current I (mA DataSheet4U.com V =+ =+3V BAT1 -0.8 -1.2 -1.6 -2.0 Current I (mA =+ =+3V BAT1 -2.0 -3.0 -4.0 -5.0 Current I (mA) MB3790 characteristics of RESET pin OL 0 =+3V BAT1 0.4 0.3 0.2 0.1 0 0.0 1.0 2.0 3.0 4.0 Current I (mA) characteristics of RESET pin OL 0 OPEN IN V =+3V BAT1 0.4 0.3 0.2 0.1 0 0.0 1.0 2.0 3.0 4.0 Current I (mA) characteristics of ALM pin OL 0 ...
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... MB3790 (Continued) 7. Temperature characteristics of input current -40 -20 Ambient temperature Temperature characteristics of power-down detection voltage 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 -40 -20 Ambient temperature DataSheet4U.com 14 4 DataSheet U .com V =+ DataSheet4U.com V INH V INL Temperature characteristics of battery power detection voltage 2 ...
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... High/Low IN INL V > V High (= V INL IN OUT V > V Low (= GND) INL IN DataSheet4U.com SBD Analog Switch 2 V BAT1 Connection to the Connection to the primary battery secondary battery MB3790 ON/OFF State of analog switch* 1 Analog switch 1 Analog switch 2 OFF OFF ) OFF OUT V BAT2 2 15 ...
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... 47k V SENSE SW SW: Turned on (V RESET DataSheet4U.com 47k 10k Q1 10k 6 ( (F) 10 (where C = capacitance (Typ) PO pin of the MB3790 to a Low level (< 1.24). The reset pin is released open. SENSE GND = High SENSE GND C T ...
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... Adjusting the Supply Voltage Detection Level Set time The MB3790 outputs a reset signal when the power supply momentarily goes down or its voltage sags for more. The set time before this reset signal is output can be extended by connecting a capacitor to the V Adjusting the Supply Voltage Detection Level Set Time ...
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... MB3790 STANDARD DEVICE CONFIGURATION ALARM1 ALARM2 GND *1 For C and For V and V IN DataSheet4U.com 18 4 DataSheet U .com V CONTROL BAT1 *2 V OUT V OUT V BAT2 ALARM1 ALARM2 GND DataSheet4U.com , use capacitors of 0.022 F or more connect these two pins to the mating pins, respectively. ...
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... Do not apply a negative voltage - Applying a negative voltage of 0 less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number MB3790PF MB3790PFT DataSheet4U.com 4 DataSheet U .com resistors in series. Package 16-pin Plastic SOP (FPT-16P-M06) 20-pin Plastic TSSOP (FPT-20P-M04) DataSheet4U.com MB3790 Remarks 19 ...
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... MB3790 PACKAGE DIMENSIONS 16-pin Plastic SOP (FPT-16P-M06 10.15 16 INDEX 1 1.27(.050) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F16015S-c-4-7 C DataSheet4U.com 20 4 DataSheet U .com Note These dimensions include resin protrusion. Note These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. ...
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... M (.009±.003) DataSheet4U.com 0.10(.004) Dimensions in mm (inches) . Note : The values in parentheses are reference values. MB3790 0.17±0.03 (.007±.001) Details of "A" part 1.10±0.10 (Mounting height) (.043±.004) 0~8 ˚ 0.05±0.05 (Stand off) 0.50±0.20 (.002± ...
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... MB3790 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device ...