ADP2140ACPZ3328R7【PDF 19/32 页】IC REG DL BCK/LINEAR 10LFCSP

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Sheet目录39

15页 16页 17页 18页 [19页]20页 21页 22页 23页

Data Sheet

ADP2140

Rev. A | Page 19 of 32

THEORY OF OPERATION

PWM/

PSM

CONTROL

ENABLE/

SEQUENCING

Gm ERROR

AMP

SOFT

START

REFERENCE

0.5V

3MHz

OSCILLATOR

CURRENT

LIMIT

POWER

GOOD

THERMAL

SHUTDOWN

VIN2

GND

EN1

EN2

UVLO

VIN1

PGND

EPAD

CURRENT

SENSE AMP

ZERO-CROSS

COMPARATOR

DRIVER

AND

ANTISHOOT

THROUGH

Figure 69. Internal Block Diagram

BUCK SECTION

The ADP2140 contains a step-down dc-to-dc converter that

uses a fixed frequency, high speed current-mode architecture. The

high 3 MHz switching frequency and tiny 10-lead, 3 mm ?3 mm

LFCSP package allow for a small step-down dc-to-dc converter

solution.

The ADP2140 operates with an input voltage from 2.3 V to 5.5 V .

Output voltage options are 1.0 V , 1.1 V , 1.2 V , 1.5 V , 1.8 V, 1.875 V ,

2.5 V, and 3.3 V.

CONTROL SCHEME

The ADP2140 operates with a fixed frequency, current-mode

PWM control architecture at medium to high loads for high

efficiency, but shifts to a variable frequency control scheme at

light loads for lower quiescent current. When operating in fixed

frequency PWM mode, the duty cycle of the integrated switches

adjust to regulate the output voltage, but when operating in power

saving mode (PSM) at light loads, the switching frequency adjusts

to regulate the output voltage.

The ADP2140 operates in the PWM mode only when the load

current is greater than the pulse skipping threshold current. At

load currents below this value, the converter smoothly transitions

to the PSM mode of operation.

PWM OPERATION

In PWM mode, the ADP2140 operates at a fixed frequency of

3 MHz set by an internal oscillator. At the start of each oscillator

cycle, the P-channel MOSFET switch is turned on, putting a

positive voltage across the inductor. Current in the inductor

increases until the current sense signal crosses the peak inductor

current level that turns off the P-channel MOSFET switch and

turns on the N-channel MOSFET synchronous rectifier. This

puts a negative voltage across the inductor, causing the inductor

current to decrease. The synchronous rectifier stays on for the

remainder of the cycle, unless the inductor current reaches zero,

which causes the zero-crossing comparator to turn off the

N-channel MOSFET.

PSM OPERATION

The ADP2140 has a smooth transition to the variable frequency

PSM mode of operation when the load current decreases below

the pulse skipping threshold current, switching only as necessary to

maintain the output voltage within regulation. When the output

voltage dips below regulation, the ADP2140 enters PWM mode

for a few oscillator cycles to increase the output voltage back to

regulation. During the wait time between bursts, both power

switches are off, and the output capacitor supplies the entire

load current. Because the output voltage occasionally dips and

recovers, the output voltage ripple in this mode is larger than the

ripple in the PWM mode of operation.

PULSE SKIPPING THRESHOLD

The output current at which the ADP2140 transitions from

variable frequency PSM control to fixed frequency PWM control

is called the pulse skipping threshold. The pulse skipping threshold

has been optimized for excellent efficiency over all load currents.

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