MP2636GR datasheet(36/40 Pages) MPS

36 / 40 page

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

MP2636 Rev.1.01

www.MonolithicPower.com

5/1/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

APPLICATION INFORMATION

COMPONENT SELECTION

Setting the Charge Current in Charge Mode

In charge mode, both the external sense resistor,

RS1, and the resistor RISET connect to the ISET

pin to set the charge current (ICHG) of the MP2636

(see the Typical Application circuit).

Given expected ICHG and RS1, RISET can be

calculated as:

ISET

CHG

2400

(k )

(A) RS1(m )





(11)

For example, for ICHG=2.5A, and RS1=20mΩ,

RISET = 48kΩ.

Given a 20m

Ω RS1, the expected RISET for typical

charge current listed as below:

RISET (kΩ)

Charge Current (A)

120

1.0

1.5

2.0

2.5

3.0

Setting the Input Current Limiting in Charge

Mode

In charge mode, connect a resistor from the ILIM

pin to AGND to program the input current limit.

The relationship between the input current limit

and setting resistor is as following:

ILIM

IN _ LIM

43.3

(k )

(A) 0.05





(12)

For

most

applications,

use

RILIM

= 51

kΩ

(IUSB_LIM=900mA) for USB3.0 mode, and use RILIM

= 86.6

kΩ (IUSB_LIM=500mA) for USB2.0 mode.

Setting the Input Voltage Range for Different

Operation Modes

A resistive voltage divider from the input to PWIN

pin determines the operating mode of MP2636.

PWIN

(V)

RH RL





(13)

If the voltage on PWIN is higher than 0.8V, the

MP2636 works in the charge mode. While the

voltage is lower than 0.8V, the MP2636 will work

in boost mode or sleep mode depending on the

MODE status. (see Table 1).

Setting

the

Input

Voltage

Regulation

Charge Mode

In charge mode, connect a resistor divider from

the IN pin to AGND with tapped to REG pin to

program the input voltage regulation.

IN _ R

REG

R3 R4

(V)





(14)

With the given R4, R3 is:

IN _ R

REG

R4(V)





(15)

For a preset input voltage regulation value, say

4.75V, start with R4

=5.1kΩ, R3 is 15kΩ.

NTC Function in Charge Mode

Figure 14 shows that an internal resistor divider

sets the low temperature threshold (VTL) and high

temperature threshold (VTH) at 66.6%·VSYS and

35%·VSYS,

respectively.

For

given

NTC

thermistor, select an appropriate RT1 and RT2 to

set the NTC window.

NTC_Cold

SYS

NTC_Cold

R //R

66.6%

R //R





(16)

NTC_Hot

SYS

NTC_Hot

R //R

TH 35%

R //R





(17)

Where RNTC_Hot is the value of the NTC resistor at

the upper bound of its operating temperature

range, and RNTC_Cold is its lower bound.

The two resistors, RT1 and RT2, independently

determine the upper and lower temperature limits.

This flexibility allows the MP2636 to operate with

most NTC resistors for different temperature

range requirements. Calculate RT1 and RT2 as

follows:

NTC_Hot

NTC _ Cold

NTC_Hot

(TL TH)

TH TL (R

)











(18)

NTC_Hot

NTC _ Cold

NTC_Hot

(TL TH)

TH (1 TL) R

TL (1 TH) R







 





 



(19)

For example, the NCP18XH103 thermistor has

the following electrical characteristic:

At 0°C, RNTC_Cold = 27.445kΩ;

At 50°C, RNTC_Hot = 4.16kΩ.

MP2636GR Datasheet(PDF) 36 Page - Monolithic Power Systems

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