6.5 V, 4 A, High Efficiency,

Step-Down DC-to-DC Regulator

Data Sheet

ADP2164

Rev. 0

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FEATURES

4 A continuous output current

43 mΩ and 29 mΩ integrated FET

±1.5% output accuracy

Input voltage range: 2.7 V to 6.5 V

Switching frequency

Fixed frequency: 600 kHz or 1.2 MHz

Adjustable frequency: 500 kHz to 1.4 MHz

Synchronizable from 500 kHz to 1.4 MHz

Selectable synchronize phase shift: 0° or 180°

Current mode architecture

Precision enable input

Power-good output

Voltage tracking input

Integrated soft start

Internal compensation

Starts up into a precharged output

UVLO, OVP, OCP, and thermal shutdown

Available in 16-lead, 4 mm × 4 mm LFCSP package

APPLICATIONS

Point-of-load conversion

Communications and networking equipment

Industrial and instrumentation

Consumer electronics

TYPICAL APPLICATIONS CIRCUIT

ADP2164

PGOOD

EN

C1

R2

SYNC

TRK

RT

SW

FB

PGND

GND

VIN

L

R1

PVIN

Figure 1.

100

95

90

85

80

75

70

65

60

55

50

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT CURRENT (A)

Figure 2. Efficiency vs. Output Current

GENERAL DESCRIPTION

The ADP2164 is a 4 A, synchronous, step-down dc-to-dc regulator

in a compact 4 mm × 4 mm LFCSP package. The regulator uses a

current mode, constant frequency pulse-width modulation (PWM)

control scheme for excellent stability and transient response.

The input voltage range of the ADP2164 is 2.7 V to 6.5 V. The

output voltage of the ADP2164 is adjustable from 0.6 V to the

output voltage options: 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V.

The ADP2164 integrates a pair of low on-resistance P-channel

and N-channel internal MOSFETs to maximize efficiency and

minimize external component count. The 100% duty cycle

operation allows low dropout voltage at 4 A output current.

The high, 1.2 MHz PWM switching frequency allows the use of

small external components, and the SYNC input enables multiple

ICs to synchronize out of phase to reduce ripple and eliminate

beat frequencies.

Other key features of the ADP2164 include undervoltage lockout

(UVLO), integrated soft start to limit inrush current at startup,

overvoltage protection (OVP), overcurrent protection (OCP),

and thermal shutdown.