MP2633A – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

MP2633A Rev. 1.03

www.MonolithicPower.com

27

4/27/2016

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APPLICATION INFORMATION

COMPONENT SELECTION

Setting the Charge Current in Charge Mode

In charge mode, both the external sense resistor,

MP2633A (see the Typical Application circuit).

)

A

(

I

)

m

(

1

RS

)

mV

(

V

CHG

IREF







(6)

)

mV

(

40

)

k

(

R

)

k

(

70

)

mV

(

V

ISET

IREF









(7)

)

mV

(

40

)

mV

(

V

)

k

(

70

)

k

(

R

IREF

ISET









(8)

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:

)

k

(

)

A

(

I

5

.

40

R

LIM

_

IN

ILIM





(9)

the range of 0A to 2A.

Setting the Input Voltage Range for Different

Operation Modes

A resistive voltage divider from the input voltage

to PWIN pin determines the operating mode of

MP2633A.

)

V

(

6

R

4

R

6

R

V

V

IN

PWIN







(10)

If the voltage on PWIN is between 0.8V and

1.15V, the MP2633A works in the charge mode.

While the voltage on the PWIN pin is not in the

range of 0.8V to 1.15V and VIN > 2V, the

MP2633A works in the boost mode (see Table 1).

For a wide operating range, use a maximum

input voltage of 6V as the upper threshold for a

voltage ratio of:

6

R

4

R

6

R

6

15

.

1

V

V

IN

PWIN







(11)

With the given R6, R4 is then:

6

R

V

V

V

4

R

PWIN

PWIN

IN







(12)

Consider these resistors as the dummy load at

the input port. Use resistors in the hundreds of

ohms range to shorten the power-off time. For a

typical application, start with R6=51Ω, R4 is

215Ω.

REG Voltage Setting

REG pin is the feedback input of the input

voltage. Connect this pin to external resistor

divider from VIN to GND. The voltage on this pin

should be always higher than 1.2V when normal

operation.

REG

IN_MIN

R5

VV

1.2V

R3 R5







(13)

Consider these resistors as the dummy load at

the input port. Use resistors in the hundreds of

ohms range to shorten the power-off time. If

VIN_MIN=4.25V, given R5=51Ω, R3=127Ω.

NTC Function in Charge Mode

Figure 12 shows that an internal resistor divider

set the NTC window.