MAX8654(2006) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8654
(Rev.:2006)

12V, 8A 1.2MHz Step-Down Regulator

Maxim Integrated 

12V, 8A 1.2MHz

Step-Down Regulator

INPUT

4.5V TO 14V

10μF

10μF

0.1μF

VL

1μF

2.2μF

100kΩ

75kΩ

0.022μF

IN

IN

BST

VP

MAX8654 LX

VL

PGND

VDL

FREQ

ILIM

REFIN

SS

FB

COMP

SYNC

SYNCOUT

EN

PWRGD

GND

0.22μF 1.0μH

2 x 22μF

OUTPUT

3.3V, 8A

1nF

4.99kΩ

100Ω

3.57kΩ

10nF

22pF

VL

20kΩ

1.1kΩ

Figure 1. Typical Application Circuit, 3.3V, 8A, 500kHz

Detailed Description

The MAX8654 high-efficiency, voltage-mode switching

regulator is capable of delivering up to 8A of output

current. The MAX8654 provides output voltages from

0.6V to 0.85 x VIN from 4.5V to 14V input supplies, mak-

ing them ideal for on-board point-of-load applications.

The output voltage accuracy is better than ±1% over

temperature.

The MAX8654 allows for all ceramic-capacitor designs

and faster transient responses. The device is available in

a 6mm x 6mm 36-pin thin QFN-EP package. The SYN-

COUT function allows end users to operate two

MAX8654s at the same switching frequency with 180°

out-of-phase operation to minimize the input ripple cur-

rent, consequently reducing the input capacitance

requirements. The REFIN function makes the MAX8654

an ideal candidate for DDR and tracking power supplies.

Using internal low RDS(ON) n-channel MOSFETs for both

high- and low-side switches maintains high efficiency at

both heavy load and high switching frequencies.

The MAX8654 uses voltage-mode control architecture

with a high-bandwidth (20MHz) error amplifier. The volt-

age-mode control architecture allows up to 1.2MHz

switching, reducing board area. The op-amp voltage

error amplifier works with type 3 compensation to fully

utilize the bandwidth of the high-frequency switching to

obtain fast transient response. Adjustable soft-start time

provides flexibility to minimize input startup inrush cur-

rent. The open-drain power-good (PWRGD) output

goes high impedance when the output reaches 90% of

its regulation point.

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