MAX17085GTL datasheet(25/38 Pages) MAXIM

Il numero della parte	MAX17085GTL

Spiegazioni elettronici	Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators

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Produttore elettronici	MAXIM [Maxim Integrated Products]

Homepage	https://www.maximintegrated.com/en.html

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Integrated Charger, Dual Main Step-Down

Controllers, and Dual LDO Regulators

______________________________________________________________________________________ 25

cycle cannot start until the IMAX comparator’s output

goes low.

U

The ZCMP comparator provides zero-crossing detec-

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.

U

The OV comparator is used to prevent overvoltage

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.

CCV, CCI, CCS, and LVC Control Blocks

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.

Figure 4. Charger Functional Diagram

CCMP

R

IMIN

Q

IMAX

Q

S

OFF-TIME

ONE-SHOT

VCSI

LIMIT

5mV

CSI

LVC

DHC

DRIVER

DLC

DRIVER

OFF-TIME

COMPUTE

CSSP

BDIV

VCTL + 40mV

CSIN

ZCMP

10mV

OVP

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