MAX8725ETI datasheet(26/30 Pages) MAXIM

Numer części	MAX8725ETI

Szczegółowy opis	Multichemistry Battery Charger with Automatic System Power Selector

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Producent	MAXIM [Maxim Integrated Products]

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Multichemistry Battery Chargers with Automatic

System Power Selector

26

______________________________________________________________________________________

Design Procedure

Table 2 lists the recommended components and refers

to the circuit of Figure 2. The following sections

describe how to select these components.

MOSFET Selection

MOSFETs P2 and P3 (Figure 1) provide power to the

system load when the AC adapter is inserted. These

devices may have modest switching speeds, but must

be able to deliver the maximum input current as set by

RS1. As always, care should be taken not to exceed

the device’s maximum voltage ratings or the maximum

operating temperature.

The p-channel/n-channel MOSFETs (P1, N1) are the

switching devices for the buck controller. The guidelines

for these devices focus on the challenge of obtaining

high load-current capability when using high-voltage

(>20V) AC adapters. Low-current applications usually

require less attention. The high-side MOSFET (P1) must

be able to dissipate the resistive losses plus the switching

losses at both VDCIN(MIN) and VDCIN(MAX).

Ideally, the losses at VDCIN(MIN) should be roughly equal

to losses at VDCIN(MAX), with lower losses in between. If

the losses at VDCIN(MIN) are significantly higher than the

losses at VDCIN(MAX), consider increasing the size of P1.

Conversely, if the losses at VDCIN(MAX) are significantly

higher than the losses at VDCIN(MIN), consider reducing

the size of P1. If DCIN does not vary over a wide range,

the minimum power dissipation occurs where the resistive

losses equal the switching losses.

REFERENCE QTY

DESCRIPTION

C1, C4

2

22µF ±20%, 35V E-size low-ESR

tantalum capacitors

AVX TPSE226M035R0300

Kemet T495X226M035AS

C5, C15

2

1µF ±10%, 25V, X7R ceramic capacitors

(1206)

Murata GRM31MR71E105K

Taiyo Yuden TMK316BJ105KL

TDK C3216X7R1E105K

C9, C10

2

0.01µF ±10%, 25V, X7R ceramic

capacitors (0402)

Murata GRP155R71E103K

TDK C1005X7R1E103K

C11, C14,

C17

3

0.1µF ±10%, 25V, X7R ceramic

capacitors (0603)

Murata GRM188R71E104K

TDK C1608X7R1E104K

C12, C13,

C16

3

1µF ±10%, 6.3V, X5R ceramic

capacitors (0603)

Murata GRM188R60J105K

Taiyo Yuden JMK107BJ105KA

TDK C1608X5R1A105K

D4

1

Schottky diode, 0.5A, 30V SOD-123

Diodes Inc. B0530W

General Semiconductor MBR0530

ON Semiconductor MBR0530

D5

1

25V ±1% zener diode

CMDZ5253B

L1

1

10µH, 4.4A inductor

Sumida CDRH104R-100NC

TOKO 919AS-100M

Table 2. Recommended Components

REFERENCE QTY

DESCRIPTION

N1/P1

1

Dual n- and p-channel MOSFETs, 7A,

30V and -5A, -30V, 8-pin SO, MOSFET

Fairchild FDS8958A or

Single n-channel MOSFETs, +13.5A,

+30V FDS6670S and

Single p-channel MOSFETs, -13.5A,

-30V FDS66709Z

P2, P3, P4

3

Single, p-channel, -11A, -30V, 8-pin SO

MOSFETs

Fairchild FDS6675

R4

1

100kΩ, ±5% resistor (0603)

R5, R9, R21

2

10kΩ ±1% resistors (0603)

R6

1

590kΩ ±1% resistor (0603)

R7

1

196kΩ ±1% resistor (0603)

R8

1

1MΩ ±5% resistor (0603)

R11

1

1kΩ ±5% resistor (0603)

R16

1

33Ω ±5% resistor (0603)

R19, R20

2

10kΩ ±5% resistors (0603)

RS1

1

0.01Ω ±1%, 0.5W sense resistor (2010)

Vishay Dale WSL2010 0.010 1.0%

IRC LRC-LR2010-01-R010-F

RS2

1

0.015Ω ±1%, 0.5W sense resistor (2010)

Vishay Dale WSL2010 0.015 1.0%

IRC LRC-LR2010-01-R015-F

U1

1

MAX1909ETI/MAX8725ETI (28-pin thin

QFN-EP)

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