5.5 V, 5 A/6 A, High Efficiency, Step-Down

DC-to-DC Regulators with Output Tracking

Data Sheet

ADP2165/ADP2166

Rev. B

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FEATURES

Continuous output current

ADP2165: 5 A

ADP2166: 6 A

Integrated MOSFET

High-side on resistance: 19 mΩ

Low-side on resistance: 15 mΩ

Reference voltage: 0.6 V ± 1% over temperature range

Input voltage range: 2.7 V to 5.5 V

Current mode architecture

Switching frequency

Fixed frequency: 620 kHz or 1.2 MHz

Adjustable frequency: 250 kHz to 1.4 MHz

Synchronizes to external clock: 250 kHz to 1.4 MHz

Selectable synchronize phase shift: in phase or out of phase

External compensation

Programmable soft start

Startup into a precharged output

Voltage tracking input

Power-good output and precision enable input

Accurate current limit

Available in 24-lead, 4 mm × 4 mm LFCSP package

Supported by ADIsimPower™ design tool

APPLICATIONS

Point of load regulation

Communications and networking

High end consumer

Industrial, instrumentation, and healthcare

GENERAL DESCRIPTION

The ADP2165/ADP2166 are high efficiency, current mode

control, step-down dc-to-dc regulators with an integrated 19 mΩ

high-side FET and a 15 mΩ synchronous rectified FET. The

ADP2165/ADP2166 combine a small size, 4 mm × 4 mm LFCSP

package with an accurate current limit, resulting in a smaller

inductor size and a high power density, point of load solution.

Key features include precision enable, power-good monitor,

and output voltage tracking to facilitate robust sequencing.

The switching frequency can be programmed from 250 kHz

to 1.4 MHz, or it can be fixed at 620 kHz or 1.2 MHz. The

synchronization function allows the switching frequency to

synchronize to an external clock, minimizing the

electromagnetic interference (EMI) of the system.

TYPICAL APPLICATION CIRCUIT

ADP2165/

ADP2166

BST

FB

COMP

PGOOD

GND

VREG

RT

TRK

SYNC

SS

L1

SW

PGND

EN

PVIN

AVIN

Figure 1.

The ADP2165/ADP2166 are designed to be extremely flexible

with the addition of a minimal amount of external components

to program soft start and control loop compensation.

The ADP2165/ADP2166 are supplied from an input voltage of

2.7 V to 5.5 V. Output voltage options include 3.3 V, 2.5 V, 1.8 V,

1.5 V, 1.2 V, or 1.0 V fixed outputs and adjustable options capable

of supporting an output voltage range from 0.6 V to 90% of the

input voltage. Protection features include undervoltage lockout

(UVLO), overvoltage protection (OVP), overcurrent protection

(OCP), and thermal shutdown (TSD) for robust performance.

The ADP2165/ADP2166 operate over the −40°C to +125°C

junction temperature range and are available in a 24-lead

LFCSP package.

100

50

55

60

65

70

75

80

85

90

95

0

1

2

3

4

5

6

OUTPUT CURRENT (A)

Figure 2. Efficiency vs. Output Current