ADP1607-001-EVALZ Analog Devices, ADP1607-001-EVALZ Datasheet - Page 13

• 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
CHOOSING THE INPUT CAPACITOR
The
(C
maintaining a constant input voltage. The value of the input
capacitor can be increased without any limit for smaller input
voltage ripple and better input voltage filtering. The capacitor must
have a 4 V or higher voltage rating to support the maximum
input operating voltage. It is recommended that C
close to the
Different types of capacitors can be considered, but for battery-
powered applications, the best choice is the multilayer ceramic
capacitor, due to its small size, low equivalent series resistance
(ESR), and low equivalent series inductance (ESL). X5R or X7R
dielectrics are recommended. Y5V capacitors should not be used
due to their variation in capacitance over temperature. Alterna-
tively, use a high value, medium ESR capacitor in parallel with a
0.1 µF low ESR capacitor.
CHOOSING THE OUTPUT CAPACITOR
The
maintain the output voltage and supply current to the load. The
output capacitor supplies the current to the load when the N-
channel switch is turned on. Similar to C
ESR, X5R or X7R ceramic capacitor is recommended for C
When choosing the output capacitor, it is also important to account
for the loss of capacitance due to output voltage dc bias. This
may result in using a capacitor with a higher rated voltage to
achieve the desired capacitance value. See Figure 25 for an
example of how the capacitance of a 10 µF ceramic capacitor
changes with the dc bias voltage.
IN
) between VIN and GND to supply transient currents while
ADP1607
ADP1607
ADP1607
requires a 10 µF or greater input bypass capacitor
also requires a 10 µF output capacitor (C
as possible.
IN
, a 4 V or greater, low
IN
be placed as
OUT
OUT
) to
.
Rev. A | Page 13 of 16
The value and characteristics of the output capacitor greatly
affect the output voltage ripple, transient performance, and
stability of the regulator. The output voltage ripple (∆V
continuous operation is calculated as follows:
where:
Q
t
C
I
and,
As shown in the duty cycle and output ripple voltage equations,
the output voltage ripple increases with the load current.
ON
OUT
OUT
C
is the charge removed from the capacitor.
is the on time of the N-channel switch.
is the output load current.
is the effective output capacitance.
t
∆
D
ON
V
12
10
=
8
6
4
2
0
OUT
0
=
V
Figure 25. Typical Ceramic Capacitor Performance
OUT
f
=
D
V
SW
OUT
C
−
Q
OUT
1
C
V
IN
=
I
OUT
2
DC BIAS VOLTAGE (V)
C
OUT
×
t
ON
3
4
5
ADP1607
6
OUT
) in
(4)
(5)
(6)