mb3790pf Fujitsu Microelectronics, Inc., mb3790pf Datasheet
mb3790pf
Available stocks
Related parts for mb3790pf
mb3790pf Summary of contents
Page 1
FUJITSU SEMICONDUCTOR DATA SHEET ASSP For Power Supply Applications Bi-CMOS Battery Backup IC 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 ...
Page 2
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) ...
Page 3
BLOCK DIAGRAM V IN CONTROL 590 k Reference voltage power 1.24 V supply circuit + - V SENSE 240 k GND R = 0.5 ON 2.65 V 500 2. ...
Page 4
MB3790 PIN DESCRIPTION Pin number Symbol 16P 20P BATI OUT BAT2 — N. ALARM1 7 9 ALARM2 8 10 GND 9 11 ...
Page 5
FUNCTIONAL DESCRIPTION 1. Battery Backup Function • When the power supply voltage exceeds the voltage detection level (i.e 200 mA from the V power supply to the load circuit via the V IN • When the power ...
Page 6
MB3790 DESCRIPTION OF OPERATION 1. Operation When the Input Voltage Goes On or Off V IN (1) V OUT RESET High level RESET Low level (1) Power-on While the power supply voltage is less than V are in the standby ...
Page 7
Momentary power failure or voltage dip When the power supply voltage drops less than or equal to V voltage dips momentarily, the RESET pin outputs a High level and the RESET pin outputs a low level. The devices such ...
Page 8
MB3790 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Input voltage V IN Battery voltage V BAT Reset output Voltage V RESET Alarm output Voltage V ALARM Output current I OUT Output high current I OH Output low current I OL Power dissipation ...
Page 9
ELECTRICAL CHARACTERISTICS • DC characteristics (Recommended operating conditions unless otherwise noted.) Parameter All sections Input current Backup Input/output voltage Power difference Supply Section Output delay time Input low voltage detection Input low voltage hysteresis width Power Supply Reset output voltage ...
Page 10
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 ...
Page 11
TIMING CHART 1. Rise/Fall Times on Reset and Alarm Pins: t RESET RESET ALARM1 ALARM2 10% 2. Reset Pulse Width Input Pulse Width pdR RESET / 90% 90% 10% ...
Page 12
MB3790 3. Alarm Output delay time BAT1 ALARM1 ALARM2 4. V Output Delay Time: t OUT OUT 12 pdA 50mV V V BATL1, BATL2 50mV t pdA ro 98 ...
Page 13
TYPICAL CHARACTERISTIC CURVES 1. V characteristics of RESET pin OH 3 BAT1 2.8 2.6 2.4 2.2 2.0 0.0 -0.2 -0.4 -0.6 Current I (mA characteristics of RESET pin OH 5.0 4.8 4.6 4.4 V 4.2 ...
Page 14
MB3790 (Continued) 7. Temperature characteristics of input current -40 - 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 ...
Page 15
APPLICATION 1. Method of Using the CONTROL Pin It is possible to control the operation of analog switch 1 by entering a High or Low level to the CONTROL pin while being powered by the battery. The Table below shows ...
Page 16
MB3790 3. Outputting Reset Signal Forcibly The reset signal can be output forcibly by bringing the V signal is held on until the capacitor C Forced Reset Method Forced Reset Method 10k Control ...
Page 17
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 ...
Page 18
MB3790 STANDARD DEVICE CONFIGURATION ALARM1 ALARM2 GND *1 For C and C , use capacitors of 0.022 F or more For V and V , connect these two pins to the mating ...
Page 19
... The worker must put on a grounding device containing 250 k • 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 resistors in series. Package 16-pin Plastic SOP (FPT-16P-M06) 20-pin Plastic TSSOP (FPT-20P-M04) ...
Page 20
MB3790 PACKAGE DIMENSIONS 16-pin Plastic SOP (FPT-16P-M06) +0.25 +.010 * 1 10.15 .400 –0.20 –.008 16 INDEX 1 1.27(.050) 0.47±0.08 (.019±.003) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F16015S-c-4 Note These dimensions include resin protrusion. Note 2) ...
Page 21
...
Page 22
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 ...