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1.2MHz Low-Cost,
High-Performance Chargers
Operating Conditions
Q1a
RS1
15m Ω
SYSTEM LOAD
The MAX17005/MAX17006/MAX17015 have the following
operating states:
C7
10nF
C IN
ADAPTER
Q1b
?
Adapter Present: When DCIN is greater than 8.7V,
the controller detects the adapter. In this condition,
both the LDO and V AA turn on and battery charging
is allowed:
R6
50k Ω
BATTERY
a) Charging: The total MAX17005/MAX17006/
MAX17015 quiescent current when charging is
CSSP
CSSN
D1
3mA (max) plus the current required to drive the
MOSFETs.
MAX17015
BST
C4
0.1 μ F
b) Not Charging: To disable charging drive ISET
below 26mV. When the adapter is present and
charging is disabled, the total adapter quiescent
current is less than 1.5mA and the total battery
DHI
N1
quiescent current is less than 60μA. The charge
LX
Figure 5. Current-Monitoring Design Battery Discharge
?
pump still operates.
Adapter Absent (Power Fail): When V DCIN is less
than V CSIN + 120mV, the DC-DC converter is in
dropout. The charger detects the dropout condition
and shuts down.
IINP can also be used to monitor battery discharge cur-
rent (see Figure 5). In the MAX17015, when the adapter is
absent, drive ISET above 1V to enable IINP during battery
discharge. When the adapter is reinserted, ISET must be
The MAX17005/MAX17006/MAX17015 allow charging
under the following conditions:
? DCIN > 7.5V, LDO > 4V, V AA > 3.1V
released to the correct control level within 300ms.
AC Adapter Detection
?
?
V DCIN > V CSIN + 420mV (300mV falling hysteresis)
V ISET > 45mV or PWM detected
The MAX17005/MAX17006/MAX17015 include a hys-
teretic comparator that detects the presence of an AC
power adapter. When ACIN is lower than 2.1V, the
open-drain ACOK output becomes high impedance.
Connect a 10k Ω pullup resistance between LDO and
ACOK . Use a resistive voltage-divider from the
adapter’s output to the ACIN pin to set the appropriate
detection threshold. Select the resistive voltage-divider
so that the voltage on ACIN does not to exceed its
absolute maximum rating (6V).
LDO Regulator and V AA
An integrated low-dropout (LDO) linear regulator pro-
vides a 5.4V supply derived from DCIN, and delivers
over 40mA of load current. Do not use the LDO to
external loads greater than 10mA. The LDO powers the
gate drivers of the n-channel MOSFETs. See the
MOSFET Drivers section. Bypass LDO to PGND with a
4.7μF ceramic capacitor. V AA is 4.2V reference sup-
plied by DCIN. V AA biases most of the control circuitry,
and should be bypassed to GND with a 1μF or greater
ceramic capacitor.
____________________DC-DC Converter
The MAX17005/MAX17006/MAX17015 employ a syn-
chronous step-down DC-DC converter with an n-chan-
nel high-side MOSFET switch and an n-channel
low-side synchronous rectifier. The charger features a
controlled inductor current-ripple architecture, current-
mode control scheme with cycle-by-cycle current limit.
The controller’s off-time (t OFF ) is adjusted to keep the
high-side MOSFET junction temperature constant. In
this way, the controller switches faster when the high-
side MOSFET has available thermal capacity. This
allows the inductor current ripple and the output-volt-
age ripple to decrease so that smaller and cheaper
components can be used. The controller can also oper-
ate in discontinuous conduction mode for improved
light-load efficiency.
14
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