ADP1607-001-EVALZ Analog Devices, ADP1607-001-EVALZ Datasheet - Page 11

• Manufacturer Part Number: ADP1607-001-EVALZ
• Description: Power Management IC Development Tools Eval Board PWM Mode Only
• Manufacturer: Analog Devices
• Type: DC/DC Converters, Regulators & Controllersr
• Series: ADP1607r

Specifications of ADP1607-001-EVALZ

• Rohs: yes
• Tool Is For Evaluation Of: ADP1607
• Input Voltage: 0.8 V to 3.3 V
• Factory Pack Quantity: 1

Data Sheet
operates in PFM mode for light load currents and switches to
PWM mode for medium and heavy load currents.
Pulse Frequency Modulation (PFM)
When the auto mode version of the
under light load conditions, the effective switching frequency
and supply current are decreased and varied using PFM to
regulate the output voltage. This results in improved efficiencies
and lower quiescent currents. In PFM mode, the converter only
switches when necessary to keep the output voltage between the
PFM comparator high output voltage threshold and the lower
sleep mode exit voltage threshold. Switching stops when the
upper PFM limit is reached and resumes when the lower sleep
mode exit threshold is reached.
When V
and the part enters sleep mode. In sleep mode, the
mostly shut down, significantly reducing the quiescent current.
The output voltage is then discharged by
the load until the output voltage reaches the lower sleep
mode exit threshold. After crossing the lower sleep mode
exit threshold, switching resumes and the process repeats.
Mode Transition
The auto mode version of the
between PFM and PWM modes to maintain optimal efficiency.
Switching to PFM allows the converter to save power by sup-
plying the lighter load current with fewer switching cycles. The
mode transition point depends on the operating conditions.
See Figure 14 for typical transition levels for V
Hysteresis exists in the transition point to prevent instability
and decreased efficiencies that may result if the converter
oscillates between PFM and PWM for a fixed input voltage and
load current.
The output voltage in PWM can be above or below the PFM
voltage of that part.
OUT
exceeds the upper PFM threshold, switching stops
ADP1607
ADP1607
switches automatically
is operating
OUT
= 2.5 V.
ADP1607
Rev. A | Page 11 of 16
is
INTERNAL CONTROL FEATURES
Input to Output Isolation
While in shutdown, the
bulk of the PMOS to force it off and internally isolate the path
from the input to output. This allows the output to drop to
ground, reducing the current consumption of the application
in shutdown.
Soft Start
The
control of the part. When EN goes high, or when the part
recovers from a TSD, the start-up sequence begins. The output
voltage increases through a sequence of stages to ensure that
the internal circuitry is powered up in the correct order as the
output voltage rises to its final value.
Current Limit
The
that does not vary with duty cycle.
Synchronous Rectification
In addition to the N-channel MOSFET switch, the
has a P-channel MOSFET switch to build the synchronous
rectifier. The synchronous rectifier improves efficiency,
especially for small load currents, and reduces cost and board
space by eliminating the need for an external Schottky diode.
Compensation
The PWM control loop of the
sated to deliver maximum performance with no additional
external components. The
2.2 μH chip inductors and 10 μF ceramic capacitors. Other
values may reduce performance and/or stability.
Thermal Shutdown (TSD) Protection
The
when the part is in PWM mode only. If the die temperature
exceeds 150°C (typical), the TSD protection activates and turns
off the power devices. They remain off until the die temperature
falls below 135°C (typical), at which point the converter
restarts.
ADP1607
ADP1607
ADP1607
soft start sequence is designed for optimal
is designed with a fixed 1 A typical current limit
includes thermal shutdown (TSD) protection
ADP1607
ADP1607
ADP1607
manages the voltage of the
is designed to work with
is internally compen-
ADP1607
ADP1607