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| ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 1 of 14 charge pump and battery management asic bare die cbc910 power manager asic features ? power manager with charge control ? built-in battery protection ? temperature compensated charge control ? adjustable switchover voltage ? charges battery over a wide supply range ? low standby power ? wire bond attachment standard ? gold solder bump for attachment optional ? eco-friendly, rohs compliant the cbc910 is a power management solution that provides battery backup control and power management for systems requiring power bridging and/or secondary power. during normal operation, the cbc910 delivers a controlled voltage using an internal charge pump that operates from 2.5v to 5.5v. an enable pin allows for activation and deactivation of the charge pump using an external control line in order to minimize current consumption when battery charge current is not needed. when the primary power supply dips below a user- defned threshold voltage, the cbc910 will signal this event and route the battery voltage to v out . the cbc910 also has battery protection circuitry to protect an attached battery from being discharged too deeply. the cbc910 is available as a bare die having 9 bond pads. applications ? standby supply for non-volatile sram, real-time clocks, controllers, supply supervisors, and other system-critical components. ? wireless sensors and rfid tags and other powered, low duty cycle applications. ? localized power source to keep microcontrollers and other devices alert in standby mode. ? power bridging to provide back-up power to system during exchange of main batteries. ? consumer appliances that have real-time clocks; provides switchover power from main supply to backup battery. ? business and industrial systems such as: network routers, point-of-sale terminals, single- board computers, test equipment, multi-function printers, industrial controllers, and utility meters. ? energy harvesting by coupling the energy storage device with energy transducers such as solar panels. figure 1 - typical cbc910 applica - tion circuit using external enerchip rechargeable battery as a backup power source for a real-time clock
?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 2 of 14 functional block diagram figure 2: cbc910 internal block diagram the cbc910 internal schematic is shown in figure 2. the input voltage from the power supply (v dd ) is applied to the charge pump, the control logic, and is compared to the user-set threshold as determined by the voltage on v mode . v mode is an analog input ranging from 0v to v dd . the enable pin is a digital input that turns off the charge pump when low. v out is either supplied from v dd or the integrated battery. reset is a digital output that, when low, indicates v out is being sourced by a backup battery. c fly is the fying capacitor in the voltage doubler circuit. the value of c fly can be changed if the output impedance of the cbc910 needs to be modifed. the output impedance is dictated by 1/fc, where f is the frequency of oscillation (typically 100khz) and c is the capacitor value (typically 0.1f). gnd is system ground. vchg gnd electrical properties battery backup output voltage: 3.3 v physical properties die size: 0.96 mm x 1.36 mm (to center of scribe on wafer) operating temperature: -40c to +85c storage temperature: -40c to +125c cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 3 of 14 pin number label description 1 vdd positive supply 2 vbat 4.1v charging source 3 en charge pump enable 4 gnd ground 5 cn charge pump flying capacitor (-) 6 cp charge pump flying capacitor (+) 7 reset/ battery backup indicator 8 vout output device input/ouput descriptions figure 3: cbc910 die pad designations vdd vbat enable vmode gnd vout reset / cp cn cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 4 of 14 absolute maximum ratings parameter condition min typical max units output voltage v out v dd > v th - v dd - v operating temperature - -40 25 85 c storage temperature - -40 - +125 (2) c note: all specifcations contained within this document are subject to change without notice. parameter condition min typical max units v dd with respect to gnd 25c gnd - 0.3 - 6.0 v enable and v mode input voltage 25c gnd - 0.3 - v dd +0.3 v v bat (1) 25c 3.0 - 4.3 v v out 25c gnd-0.3 - 6.0 v reset output voltage 25c gnd - 0.3 - v out +0.3 v cp, flying capacitor voltage 25c gnd - 0.3 - 6.0 v cn 25c gnd - 0.3 - v dd +0.3 v operating characteristics (1) no external connections to this pin is allowed, except rechargeable batteries requiring a 4.1v charge voltage. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 5 of 14 power supply current characteristics t a = -40 oc to +85oc characteristic symbol condition min max units quiescent current i q enable=gnd v dd =3.3v - 3.5 a v dd =5.5v - 6.0 a enable=v dd v dd =3.3v - 35 a v dd =5.5v - 38 a backup battery cutoff current i qbatoff v bat < v batco , v out =0 - 0.5 na i qbaton v bat > v batco , enable=v dd , i out =0 - 42 na interface logic signal characteristics v dd = 2.5v to 5.5v, t a = -40 oc to +85oc characteristic symbol condition min max units high level input voltage v ih - v dd - 0.5 - volts low level input voltage v il - - 0.5 volts high level output voltage v oh v dd >v th (see figures 4 and 5) i l =10a v dd - 0.04v (1) - volts low level output voltage v ol i l = -100a - 0.3 volts logic input leakage current i in 0 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 7 of 14 figure 4: cbc910 switchover and disconnect timing diagrams important timing diagrams for the cbc910 relationship between battery switchover timing and battery disconnect from load timing are shown in figure 4. vd d vout user selectable threshol d battery switchover timin g vo ut =vdd vout=vba t battery disconnect from load timin g battery disonnect threshold vb co vout=(vbat-0 .6 ) typica l battery ba ckup mod e t rsbr t rsbf t coof f t rsbr 2.5 volt s v th vout=( vb at-0.6) typica l vreset cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 8 of 14 timing diagrams for the cbc910 relationship between v dd to reset and enable high to charge pump becoming active are shown in figure 5. figure 5: timing diagrams for v dd to reset and enable to charge pump active. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 9 of 14 cbc910 detailed description the cbc910 uses a charge pump to generate the supply voltage for charging a battery. an internal fet switch with low rds on is used to route v dd to v out during normal operation when main power is above the battery switchover threshold voltage. when v dd is below the battery switchover threshold voltage, the fet switch is shut off and v out is supplied by the battery through a silicon diode in series between vbat and vout. an interrupt signal is asserted low prior to the switchover. operating modes the enerchip cc can be operated from various power supplies such as a primary source or a non-rechargeable battery. with the enable pin asserted high, the charge pump is active and charges the integrated enerchip. the enerchip cc will be 80% charged within 10 minutes. due to the rapid recharge it is recommended that, once the enerchip cc is fully charged, the user de-assert the enable pin (i.e., force low) to reduce power consumption. a signal generated from the mcu could be used to enable and disable the enerchip cc. when controlling the enable pin by way of an external controller - as opposed to fxing the enable line to vdd - ensure that the enable pin is forced low by the controller anytime the reset line is low, which occurs when the switchover threshold voltage is reached and the device is placed in backup mode. although the internal charge pump is designed to operate below the threshold switchover level when the enable line is active, it is recommended that the enable pin be forced low whenever reset is low to ensure no parasitic loads are placed on the enerchip while in this mode. if enable is high or foating while vdd is in an inde terminate state, bias currents within the enerchip cc could fow, placing a parasitic load on the enerchip that could dramatically reduce the effective backup operating time. mode 1 operation for use in 3.3 volt systems. the v mode pin should be tied directly to gnd. this will set the battery switchover threshold at approximately 3.0 volts. mode 2 operation to adjust the user-selectable battery switchover threshold to a value between 2.5 and 5.0 volts, refer to figure 6 to determine the value of r1. to determine the amount of hysteresis from the backup battery switchover threshold, use figure 7. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 10 of 14 to determine the battery backup switchover hysteresis for mode 2 operation, use figure 7. figure 6: mode 2 resistor selection graph figure 7: mode 2 hysteresis as a function of r2/r1 battery switchover threshold voltage vs. r2/r1 ratio 0 1 2 3 4 5 6 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 r2/r1 ratio switchover threshold voltage (volts) trip point hysteresis in battery switchover threshold voltage vs. r2/r1 ratio 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 r2/r1 ratio hysteresis (volts) hysteresis battery charging and backup power for 2.5 to 5.5 volt operation is selected by changing the value of r2. to determine the battery backup switchover point, set the value of r1 to 200k ? and choose the value of r2 according to figure 6. for example, to set a 3.0v trip point: if r1=200 k ? then r2 = r1 x 0.72 = 144k?. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 11 of 14 energy harvesting with the cbc910 the cbc910 bare die asic can be confgured to collect energy from transducers such as low power photovoltaic (pv) cells and use that harvested energy to charge the integrated enerchip and deliver self-sustaining power to components such as microcontrollers, sensors, and radios in wireless systems. a feedback connection made from reset to en to implement the energy harvesting function. the cbc910 will be connected to one or more enerchip batteries for energy storage. in order to make most effcient use of the power available from the transducer (for example, a pv cell), it is necessary to know the electrical characteristics including voltage and peak power point of the transducer being used. for assistance in designing your system to effectively harvest energy from a power transducer in a specifc environment, contact cymbet applications engineering. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 12 of 14 figure 8: example cbc910 wirebond diagram in an 8l vdfn example of using a cbc910 bare die in an 8 lead vdfn notes: pad size = 1.75mm x 2.66mm pad pitch = 0.61mm cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 13 of 14 126.35 (street center to pad center) 126.35 (street center to pad center) 328.4 (street center to pad center) 340.35 (street center to pad center) cbc910 partial wafer map when purchasing wafers notes: 1) scribe lane is 150um (x) 150um (y) 2) die thickness is 150um minimum. 200um maximum. 3) all dimensions in microns. cbc910 ?2012-2014 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-11 rev a page 14 of 14 cbc910 die pad locations vdd vbat enable vmode gnd vout reset/ cp cn trim4 1102 888.9 675.55 464.35 253.4 265.35 558.15 847.15 1102 51.35 707.3 disclaimer of warranties; as is the information provided in this data sheet is provided as is and cymbet corporation disclaims all representations or warranties of any kind, express or implied, relating to this data sheet and the cymbet battery product described herein, including without limitation, the implied warranties of merchantability, ftness for a particular purpose, non-infringement, title, or any warranties arising out of course of dealing, course of performance, or usage of trade. cymbet battery products are not approved for use in life critical applications. users shall confrm suitability of the cymbet battery product in any products or applications in which the cymbet battery product is adopted for use and are solely responsible for all legal, regulatory, and safety-related requirements concerning their products and applications and any use of the cymbet battery product described herein in any such product or applications. cymbet, the cymbet logo, and enerchip are cymbet corporation trademarks ordering information enerchip cc part number description notes cbc910-bdc-wp cbc910 bare die wirebond pad shipped in waffe pack CBC910-BGC-WP cbc910 bare die gold bumped shipped in waffe pack cbc910-waf cbc910 bare die shipped as wafer notes: 1) all dimensions measured to the center of the respective bond pad and measured relative to the lower left corner of metal - 2 on the trim4 pad as shown below. that trim4 coordinate is the 0,0 reference point for the data extents of the die. total die size is 150um larger in x and y as defined by the street width. 2) die size to center of scribe is 960um (x) by 1360um (y). 3) drawing not to scale. all dimensions in microns. cbc910 |
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