MAX17005ETP 查看數據表（PDF） - Maxim Integrated

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MAX17005ETP

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 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

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 = VAA

The MAX17005 and MAX17006 support from 4.2V/cell

to 4.4V/cell, whereas the MAX17015 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 MAX17005 or

MAX17006, the MAX17015 should be used.

The charge-voltage regulation for the MAX17005 and

MAX17006 is calculated with the following equations:

VCELL

=

4.2V

+

4.2V

− VVCTL

6

for 3-cell selection of MAX17005 and MAX17006, 4.2V

> VCTL > 2.4V:

VCELL

=

4.2V

+

VVCTL

6

for 2- or 4-cell selection of MAX17006 or MAX17005,

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

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

For the MAX17015, 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 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

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

MAX17015

FB

COUT

R7

BATTERY

R8

Figure 3. MAX17015 Charge-Voltage Regulation Feedback Network

12 ______________________________________________________________________________________

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