ADP5033ACBZ-1-R7 Analog Devices Inc, ADP5033ACBZ-1-R7 Datasheet - Page 20

• Manufacturer Part Number: ADP5033ACBZ-1-R7
• Description: IC REG QD SYNC BUCK/LDO1 16WLCSP
• Manufacturer: Analog Devices Inc
• Series: -r

Specifications of ADP5033ACBZ-1-R7

• Topology: Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
• Function: Any Function
• Number Of Outputs: 4
• Frequency - Switching: 3MHz
• Voltage/current - Output 1: 0.8 V ~ 3.3 V, 800mA
• Voltage/current - Output 2: 0.8 V ~ 3.3 V, 800mA
• Voltage/current - Output 3: 0.8 V ~ 3.3 V, 300mA
• W/led Driver: No
• W/supervisor: No
• W/sequencer: No
• Voltage - Supply: 1.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-WFBGA, WLCSP
• No. Of Outputs: 4
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Supply Voltage: 5.5V
• No. Of Step-down Dc - Dc Converters: 2
• No. Of Ldo Regulators: 2
• Digital Ic Case Style: WLCSP
• No. Of Regulated Outputs: 2
• Rohs Compliant: Yes
• Primary Input Voltage: 5.5V
• Output Voltage: 2.8V
• Output Current: 800mA
• Switching Frequency Max: 3MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: ADP5033ACBZ-1-R7TR

ADP5033
APPLICATIONS INFORMATION
BUCK EXTERNAL COMPONENT SELECTION
Trade-offs between performance parameters such as efficiency
and transient response can be made by varying the choice of
external components in the applications circuit, as shown in
Figure 1.
Inductor
The high switching frequency of the ADP5033 bucks allows for
the selection of small chip inductors. For best performance, use
inductor values between 0.7 μH and 3 μH. Suggested inductors
are shown in Table 8.
The peak-to-peak inductor current ripple is calculated using
the following equation:
where:
f
L is the inductor value.
The minimum dc current rating of the inductor must be greater
than the inductor peak current. The inductor peak current is
calculated using the following equation:
Inductor conduction losses are caused by the flow of current
through the inductor, which has an associated internal dc
resistance (DCR). Larger sized inductors have smaller DCR,
which may decrease inductor conduction losses. Inductor core
losses are related to the magnetic permeability of the core material.
Because the bucks are high switching frequency dc-to-dc
converters, shielded ferrite core material is recommended for
its low core losses and low EMI.
Table 8. Suggested 1.0 μH Inductors
Vendor
Murata
Murata
Taiyo Yuden
Coilcraft®
TDK
Coilcraft
Toko
SW
is the switching frequency.
I
I
RIPPLE
PEAK
=
=
I
Model
LQM2MPN1R0NG0B
LQM18FN1R0M00B
BRC1608T1R0M
EPL2014-102ML
GLFR1608T1R0M-LR
0603LS-102
MDT2520-CN
V
LOAD
OUT
V
(
MAX
IN
×
(
×
V
)
IN
f
+
SW
I
−
RIPPLE
×
V
2
L
OUT
)
Dimensions
(mm)
2.0 × 1.6 × 0.9
1.6 × 0.8 × 0.8
1.6 × 0.8 × 0.8
2.0 × 2.0 × 1.4
1.6 × 0.8 × 0.8
1.8 × 1.69 × 1.1
2.5 × 2.0 × 1.2
I
(mA)
1400
150
520
900
230
400
1350
SAT
Rev. 0 | Page 20 of 28
DCR
(mΩ)
85
26
180
59
80
81
85
Output Capacitor
Higher output capacitor values reduce the output voltage ripple
and improve load transient response. When choosing this value,
it is also important to account for the loss of capacitance due to
output voltage dc bias.
Ceramic capacitors are manufactured with a variety of dielec-
trics, each with a different behavior over temperature and
applied voltage. Capacitors must have a dielectric adequate
to ensure the minimum capacitance over the necessary
temperature range and dc bias conditions. X5R or X7R
dielectrics with a voltage rating of 6.3 V or 10 V are recom-
mended for best performance. Y5V and Z5U dielectrics are
not recommended for use with any dc-to-dc converter because
of their poor temperature and dc bias characteristics.
The worst-case capacitance accounting for capacitor variation
over temperature, component tolerance, and voltage is calcu-
lated using the following equation:
where:
C
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
In this example, the worst-case temperature coefficient
(TEMPCO) over −40°C to +85°C is assumed to be 15% for an
X5R dielectric. The tolerance of the capacitor (TOL) is assumed
to be 10%, and C
Substituting these values in the equation yields
To guarantee the performance of the bucks, it is imperative
that the effects of dc bias, temperature, and tolerances on the
behavior of the capacitors be evaluated for each application.
EFF
is the effective capacitance at the operating voltage.
C
C
EFF
EFF
12
10
8
6
4
2
0
0
= C
= 9.24 μF × (1 − 0.15) × (1 − 0.1) = 7.074 μF
OUT
Figure 45. Typical Capacitor Performance
× (1 − TEMPCO) × (1 − TOL)
1
OUT
is 9.24 μF at 1.8 V, as shown in Figure 45.
2
DC BIAS VOLTAGE (V)
3
4
5
6