MAX17006AETP 查看數據表（PDF） - Maxim Integrated

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MAX17006AETP

1.2MHz, Low-Cost, High-Performance Chargers

Maxim Integrated 

1.2MHz, Low-Cost,

High-Performance Chargers

Setting Charge Voltage

The VCTL input adjusts the battery-output voltage,

VBATT, and determines the number of cells. For 3- and

4-cell applications, use the MAX17005A; for 2- and

3-cell applications, use the MAX17006A. Use the

MAX17015A 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

VERSION NO. OF CELLS

LEVEL

MAX17005A

3

2.4V < VCTL < 4.2V

MAX17005A

4

0 < VCTL < 1.8V

MAX17006A

2

0 < VCTL < 1.8V

MAX17006A

MAX17015A

3

Sets FB

2.4V < VCTL < 4.2V

VCTL = GND or VCTL = VAA

The MAX17005A/MAX17006A support from 4.2V/cell to

4.4V/cell, whereas the MAX17015A supports minimum

2.1V. The maximum voltage is determined with the

dropout performance of IC. When the required voltage

falls outside the range available with the MAX17005A or

MAX17006A, the MAX17015A should be used.

The charge-voltage regulation for the MAX17005A and

MAX17006A is calculated with the following equations:

VCELL

=

4.2V

+

4.2V

- VVCTL

6

for 3-cell selection of MAX17005A and MAX17006A,

4.2V > VCTL > 2.4V:

VCELL

=

4.2V

+

VVCTL

6

for 2- or 4-cell selection of MAX17006A or MAX17005A,

respectively, 0 < VCTL < 1.8V. Connect VCTL to GND

or to VAA for default 4.2V/cell battery-voltage setting.

For the MAX17015A, connect VCTL to GND to set the FB

regulation point to 2.1V. The charge-voltage regulation is

calculated with the following equation:

VCHG _ REG

=

VFB _

SETPOINT

×

R8 + R7

R8

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 10kΩ 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-

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 = 10mΩ)

for the analog input, and 60mV (6A for RS2 = 10mΩ) for

the digital PWM input.

When the MAX17005A/MAX17006A/MAX17015A power

up and the charger is ready, if there is no clock edge

within 20ms, the circuit assumes ISET is an analog

input, and disables the PWM filter block. To configure

the charge current, force the voltage on ISET according

to the following equation:

ICHG

=

240mV

RS2

×

VISET

VAA

The input range for ISET is from 0 to VAA/2. To shut

down the charger, pull ISET below 26mV.

If there is a clock edge on ISET within 20ms, the PWM

filter is enabled and ISET accepts digital PWM input.

The PWM filter has a DAC with 8-bit resolution that cor-

responds to equivalent VCSIP-CSIN steps.

CSIN

MAX17015A

FB

COUT

R7

BATTERY

R8

Figure 3. The MAX17015A Charge-Voltage Regulation Feedback

Network

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