DIO58020

Version 1.4, Mar 2025

www.dioo.com

© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

9

8. Function Description

8.1. Operation modes

8.1.1. Sleep mode

The DIO58020 series enter the low-power sleep mode if the VIN is removed from the circuit (for example,

when EN = 0).

8.1.2. Charge mode

A charge cycle begins when the voltage at the VIN pin rises above the UVLO threshold level and a program

resistor with 1% accuracy is connected from the ISET pin to ground or when a battery is connected to the

charger output. If the BAT pin is less than 2.5 V, the charger enters trickle charge mode. In this mode, the

series of DIO58020 supplies approximately 1/10 the programmed charge current to bring the battery

voltage up to a safe level for full current charging.

The device enters constant-current (CC) mode when the BAT pin voltage rises above 2.5 V. In this mode,

the programmed charge current is supplied to the battery. The program resistor and the charge current of

constant current are calculated using the equation (1).

200

R

V

1

I

ISET

BATCHRG

×

=

(1)

The device enters constant-voltage (CV) mode when the BAT pin approaches the final float voltage, and

the charge current begins to decrease. The charge cycle ends when the IBF voltage is less than 500 mV.

The terminal current is programmed using a single resistor from the IBF pin to ground. When the IBF pin

voltage falls below 500 mV for longer than tTERM, charging cycle is terminated. The charge current is latched

off and the series of DIO58020 enters standby status. In this status, all loads on the BAT pin must be

supplied by the battery. The range of RIBF is recommend: 10×RISET < RIBF < 30×RISET. Please refer to Table 4

for more details.

Table 4. RIBF vs. Icharge_terminated

VIN = 5 V, RISET = 2 kΩ

RIBF / kΩ

Icharge_terminated /mA (Typ.)

0.5C

1C

2C

3C

62

0.805

1.61

3.22

4.83

43

1.165

2.33

4.66

6.99

30

1.665

3.33

6.66

9.99

24

2.085

4.17

8.34

12.51

20

2.50

5.00

10.00

15.00

10

5.00

10.00

20.00

30.00

6.19

8.08

16.16

32.32

48.48

5.1

9.805

19.61

39.22

58.83

4.3

11.63

23.26

46.52

69.78

3.3

15.15

30.30

60.6

90.9