DS-72-11 Datasheet, PDF (2/14 Pages) Cymbet Corporation – Charge Pump and Battery Management ASIC Bare Die

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: -40°C to +85°C
Storage temperature: -40°C to +125°C
CBC910
Functional Block Diagram
The CBC910 internal schematic is shown in Figure 2. The input voltage from the power supply (VDD) is applied
to the charge pump, the control logic, and is compared to the user-set threshold as determined by the voltage
on VMODE. VMODE is an analog input ranging from 0V to VDD. The ENABLE pin is a digital input that turns off the
charge pump when low. VOUT is either supplied from VDD or the integrated battery. RESET is a digital output that,
when low, indicates VOUT is being sourced by a backup battery.
CFLY is the flying capacitor in the voltage doubler circuit. The value of CFLY can be changed if the output
impedance of the CBC910 needs to be modified. The output impedance is dictated by 1/fC, where f is the
frequency of oscillation (typically 100kHz) and C is the capacitor value (typically 0.1µF). GND is system ground.
VCHG
GND
Figure 2: CBC910 Internal Block Diagram
©2012-2014 Cymbet Corporation • Tel: [phone] • www.cymbet.com
DS-72-11 Rev A

Page 2 of 14