MAX17015 Maxim Integrated Products, MAX17015 Datasheet - Page 15

• Manufacturer Part Number: MAX17015
• Description: (MAX17005 - MAX17015) High-Performance Chargers
• Manufacturer: Maxim Integrated Products

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Figure 6. DC-DC Converter Functional Diagram
The operation of the DC-to-DC controller is determined
by the following five comparators as shown in the func-
tional diagram in Figures 2 and 6:
•
•
•
CSI
The IMIN comparator triggers a pulse in discontinu-
ous mode when the accumulated error is too high.
IMIN compares the control signal (LVC) against
10mV (referred at V
than this threshold, DHI and DLO are both forced
low. Indirectly, IMIN sets the peak inductor current
in discontinuous mode.
The CCMP comparator is used for current-mode
regulation in continuous-conduction mode. CCMP
compares LVC against the inductor current. The
high-side MOSFET on-time is terminated when the
CSI voltage is higher than LVC.
The IMAX comparator provides a secondary cycle-
by-cycle current limit. IMAX compares CSI to
110mV (corresponding to 11A when RS2 = 10mΩ).
CSSP
CSIN
SET POINT + 100mV
LVC
1A
1A
BDIV
11A
______________________________________________________________________________________
CSIP
CCMP
ZCMP
OVP
- V
IMAX
IMIN
COMPUTE
OFF-TIME
CSIN
). When LVC is less
High-Performance Chargers
• The ZCMP comparator provides zero-crossing detec-
•
R
S
ONE SHOT
OFF-TIME
The high-side MOSFET on-time is terminated when
the current-sense signal exceeds 11A. A new cycle
cannot start until the IMAX comparator’s output
goes low.
tion during discontinuous conduction. ZCMP com-
pares the current-sense feedback signal to 1A (RS2
= 10mΩ). When the inductor current is lower than
the 1A threshold, the comparator output is high,
and DLO is turned off.
The OVP comparator is used to prevent overvoltage
at the output due to battery removal. OVP com-
pares BATT against the VCTL. When BATT is
100mV/cell above the set value, the OVP compara-
tor output goes high, and the high-side MOSFET
on-time is terminated. DHI and DLO remain off until
the OVP condition is removed.
1.2MHz Low-Cost,
Q
Q
DH DRIVER
DL DRIVER
15