ADP1829ACPZ-R7 datasheet(27/32 Pages) AD

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ADP1829

Rev. 0 | Page 27 of 32

APPLICATION CIRCUITS

The ADP1829 controller can be configured to regulate outputs

with loads of more than 20 A if the power components, such as

the inductor, MOSFETs and the bulk capacitors, are chosen

carefully to meet the power requirement. The maximum load

and power dissipation are limited by the powertrain components.

Figure 1 shows a typical application circuit that can drive an

output load of 8 A.

Figure 34 shows an application circuit that can drive 20 A loads.

Note that two low-side MOSFETs are needed to deliver the 20 A

load. The bulk input and output capacitors used in this example

are Sanyo OSCON™ capacitors, which have low ESR and high

current ripple rating. An alternative to the OSCON capacitors

are the polymer aluminum capacitors that are available from

other manufacturers such as United Chemi-con. Aluminum

electrolytic capacitors, such as Rubycon’s ZLG low ESR series,

can also be paralleled up at the input or output to meet the

ripple current requirement. Because the aluminum electrolytic

capacitors have higher ESR and much larger variation in

capacitance over the operating temperature range, a larger bulk

input and output capacitance is needed to reduce the effective

ESR and suppress the current ripple. Figure 34 shows that the

polymer aluminum or the aluminum electrolytic capacitors can

be used at the outputs.

fOSC = 300kHz

M1, M4: IRLR7807Z

L1, L2: TOKO, FDA1254-1ROM

COUT1: SANYO, 2R5SEPC820M

D1, D2: VISHAY, BAT54

M2, M3, M5, M6: IRFR3709Z

CIN1, CIN2: SANYO, 20SP180M

COUT2: RUBYCON, 6.3ZLG1200M10×16

1µF

COUT2

820µF

25V

×2

47kΩ

6.8nF

1.5nF

120nF

10kΩ

4.7nF

1µF

COUT1

1200µF

6.3V

×3

10nF

200Ω

2kΩ

1kΩ

390Ω

2kΩ

5600pF

1.2V, 20A

1µH

0.47µF

1µF

CIN1

180µF

20V

1µF

CIN2

180µF

20V

1µF

VIN = 5.5V TO 18V

1.8V, 20A

TRK1

TRK2

VREG

BST1

DH1

SW1

CSL1

DL1

PGND1

FB1

COMP1

EN1

EN2

BST2

DH2

SW2

CSL2

DL2

PGND2

FB2

COMP2

FREQ

LDOSD

SYNC

GND

AGND

PGND

ADP1829

2kΩ

Figure 34. Application Circuit with 20 A Output Loads

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