MAX17085BETL+T Maxim Integrated Products, MAX17085BETL+T Datasheet - Page 25

• Manufacturer Part Number: MAX17085BETL+T
• Description: Battery Management Dual Main Step-Down Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX17085BETL+T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

U The ZCMP comparator provides zero-crossing detec-
U The OV comparator is used to prevent overvoltage
Figure 4. Charger Functional Diagram
CSI
cycle cannot start until the IMAX comparator’s output
goes low.
tion during discontinuous conduction. ZCMP com-
pares the current-sense feedback signal to 10mV.
When the current-sense signal is lower than the 10mV
threshold, the comparator output is high and DLC is
turned off.
at the output due to battery removal. OV compares
BATT against the VCTL and CELLS settings. When
BATT is 40mV/cell above the set value, the OV com-
parator output goes high and the high-side MOSFET
on-time is terminated. DHC and DLC remain off until
the OV condition is removed.
CSSP
CSIN
VCTL + 40mV
LIMIT
10mV
BDIV
5mV
V
LVC
CSI
Integrated Charger, Dual Main Step-Down
______________________________________________________________________________________
Controllers, and Dual LDO Regulators
IMAX
CCMP
ZCMP
OVP
IMIN
COMPUTE
OFF-TIME
The MAX17085B controls input current (CCS control
loop), charge current (CCI control loop), or charge
voltage (CCV control loop), depending on the operat-
ing condition. The three control loops—CCV, CCI, and
CCS—are brought together internally at the lowest
voltage clamp (LVC) amplifier. The output of the LVC
amplifier is the feedback control signal for the DC-DC
controller. The minimum voltage at the CCV, CCI, or CCS
appears at the output of the LVC amplifier and clamps
the other control loops to within 0.3V above the control
point. Clamping the other two control loops close to the
lowest control loop ensures fast transition with minimal
overshoot when switching between different control
loops (see the Compensation section). The CCI loop is
compensated internally, while the CCS and CCV loops
are compensated externally using a shared capacitor on
the CC pin.
R
S
ONE-SHOT
OFF-TIME
CCV, CCI, CCS, and LVC Control Blocks
Q
Q
DHC
DRIVER
DLC
DRIVER
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