ADP1607-001-EVALZ Analog Devices, ADP1607-001-EVALZ Datasheet - Page 10

• 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

ADP1607
THEORY OF OPERATION
OVERVIEW
The
frequency, step-up dc-to-dc switching converter with an
adjustable output voltage between 1.8 V and 3.3 V for use
in portable applications.
The 2 MHz operating frequency enables the use of small
footprint, low profile external components. Additionally, the
synchronous rectification, internal compensation, internal fixed
current limit, and current-mode architecture allow for excellent
transient response and a minimal external part count. Other
key features include fixed PWM and light load PFM mode
options, true output isolation, thermal shutdown (TSD), and
logic controlled enable.
ENABLE/SHUTDOWN
The EN input turns the
GND or logic low to shut down the part and reduce the current
consumption to 0.06 µA (typical). Connect EN to VIN or logic
high to enable the part. Do not exceed V
floating.
V
IN
ADP1607
C
IN
R1
R2
V
OUT
VIN
FB
1
3
is a high efficiency, synchronous, fixed
V
OUT
ADP1607
V
REF
EN
OFF
AMPLIFIER
CONTROL
ERROR
BULK
2
ON
C
START
R
on or off. Connect EN to
SOFT
COMP
COMP
V
V
T
DD
SEL
IN
SENSE
T
V
. Do not leave this pin
CURRENT-LIMIT
COMPARATOR
REF
COMPARATOR
SW
REF
SHUTDOWN
COMPARATOR
COMPARATOR
PWM
TSD
PFM
L1
Figure 24. Block Diagram
Rev. A | Page 10 of 16
CONTROL
PFM
OSCILLATOR
RESET
+
+
MODES OF OPERATION
The
for noise sensitive applications or in an auto PFM-to-PWM
transitioning mode option to optimize power at light loads.
Pulse-Width Modulation (PWM) Mode
The PWM version of the
PWM control scheme to force the part to maintain a fixed
2 MHz fixed frequency while regulating the output voltage over
all load conditions. The auto mode version of the
operates in PWM for higher load currents. In PWM, the output
voltage is monitored at the FB pin through the external resistive
voltage divider. The voltage at FB is compared to the internal
1.259 V reference by the internal error amplifier. This current-
mode PWM regulation system allows fast transient response
and tight output voltage regulation. PWM mode operation
results in lower efficiencies than PFM mode at light loads.
Auto Mode
Auto mode is a power-saving feature that forces the auto version
of the
to output load changes. The auto version of the
S
R
RP
ADP1607
ADP1607
QN
QP
CURRENT
N DRIVER
P DRIVER
SENSING
is available in a fixed PWM mode only option
to switch between PFM and PWM in response
AGND
A
SW
5
4
ADP1607
N
GND
V
SEL
V
IN
CROSS
ZERO
CONTROL
utilizes a current-mode
PMOS
BULK
P
6
ADP1607
Data Sheet
ADP1607
C
OUT
V
OUT