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Setting Charge Voltage
The VCTL input adjusts the battery-output voltage,
V BATT , and determines the number of cells. For 3- and
4-cell applications, use the MAX17005; for 2- and 3-cell
applications, use the MAX17006. Use the MAX17015 to
adjust the cell number and set the cell voltage with a
resistive voltage-divider from the output. Based on the
version of the part, the number of cells and the level of
VCTL should be set as in Table 1:
Table 1. Cell Configuration
There are two constraints in choosing R7 and R8. The
resistors cannot be too small since they discharge the
battery, and they cannot be too large because FB pin
consumes less than 1μA of input bias current. Pick R8
to be approximately 10k Ω and then calculate R7.
FB regulation error (±0.5% max) and the tolerance of R7
and R8 both contribute to the error on the battery volt-
age. Use 0.1% feedback resistors for best accuracy.
Setting Charge Current
The voltage at ISET determines the voltage across cur-
VERSION
MAX17005
MAX17005
MAX17006
MAX17006
MAX17015
NO. OF CELLS
3
4
2
3
Sets FB
LEVEL
2.4V < VCTL < 4.2V
0V < VCTL < 1.8V
0V < VCTL < 1.8V
2.4V < VCTL < 4.2V
VCTL = GND or VCTL = V AA
rent-sense resistor RS2. ISET can accept either analog
or digital inputs. The full-scale differential voltage
between CSIP and CSIN is 80mV (8A for RS2 = 10m Ω )
for the analog input, and 60mV (6A for RS2 = 10m Ω ) for
the digital PWM input.
When the MAX17005/MAX17006/MAX17015 power up
and the charger is ready, if there is no clock edge with-
in 20ms, the circuit assumes ISET is an analog input,
and disables the PWM filter block. To configure the
The MAX17005 and MAX17006 support from 4.2V/cell
to 4.4V/cell, whereas the MAX17015 supports minimum
charge current, force the voltage on ISET according to
the following equation:
× ISET
2.1V. The maximum voltage is determined with the
dropout performance of IC. When the required voltage
falls outside the range available with the MAX17005 or
I CHG =
240 mV
RS 2
V
V AA
MAX17006, the MAX17015 should be used.
The charge-voltage regulation for the MAX17005 and
MAX17006 is calculated with the following equations:
The input range for ISET is from 0 to V AA /2. To shut
down the charger, pull ISET below 26mV.
If there is a clock edge on ISET within 20ms, the PWM
V CELL = 4 . 2 V +
4.2 V ? V VCTL
6
filter is enabled and ISET accepts digital PWM input.
The PWM filter has a DAC with 8-bit resolution that cor-
responds to equivalent V CSIP-CSIN steps.
for 3-cell selection of MAX17005 and MAX17006, 4.2V
> VCTL > 2.4V:
V CELL = 4 . 2 V + VCTL
V
6
CSIN
for 2- or 4-cell selection of MAX17006 or MAX17005,
respectively, 0V < VCTL < 1.8V. Connect VCTL to GND
or to V AA for default 4.2V/cell battery-voltage setting.
MAX17015
C OUT
R7
BATTERY
For the MAX17015, connect VCTL to GND to set the FB
regulation point to 2.1V. The charge-voltage regulation is
FB
calculated with the following equation:
R8
V CHG _ REG = V FB _ SETPOINT ×
R8 + R7
R 8
Figure 3. MAX17015 Charge-Voltage Regulation Feedback Network
12
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