ADP1610 Analog Devices, ADP1610 Datasheet - Page 11

• Manufacturer Part Number: ADP1610
• Description: 1.2 MHz DC-DC Step-Up Switching Converter
• Manufacturer: Analog Devices

Table 4. Recommended Capacitor and Inductor Manufacturers
Vendor
Sumida
Coilcraft
Toko
Murata
Using the duty cycle and switching frequency (F
is calculated using the following equation:
The inductor ripple current (ΔI
using the following equation:
The inductance value (L) is calculated using the following
equation:
The peak inductor current (the maximum input current plus
half the inductor ripple current) must be less than the rated
saturation current of the inductor. Likewise, the maximum
rated rms current of the inductor must be greater than the
maximum dc input current to the regulator.
For duty cycles greater than 50%, which occur with input
voltages greater than one-half the output voltage, slope compensa-
tion is required to maintain stability of the current-mode regulator.
For stable current-mode operation, ensure that the selected
inductance is equal to or greater than L
equation:
t
Δ I
L =
L
ON
>
L
=
=
L
V
MIN
IN
Part
CMD4D11-2R2MC
CMD4D11-4R7MC
CDRH4D28-100
CDRH5D18-220
CR43-4R7
CR43-100
DS1608-472
DS1608-103
D52LC-4R7M
D52LC-100M
GRM32ER61A226KE20L
GRM31CR61E106KA12L
GRM31CR61A106KA01L
GRM31CR71E475KA88L
V
f
D
Δ
SW
IN
×
I
=
L
t
×
L
ON
V
1
t
8 .
OUT
ON
A
×
−
V
f
SW
IN
L
) in steady state is calculated
2.2
4.7
L (μH)
10
22
4.7
10
4.7
10
4.7
10
MIN
using the following
C (μF)/Rating (V)
22/10
10/25
10/10
4.7/25
SW
), the on-time
Rev. A | Page 11 of 20
(4)
(5)
(6)
(7)
Maximum
DC Current
0.95
0.75
1.00
0.80
1.15
1.04
1.40
1.00
1.14
0.76
CHOOSING THE INPUT AND OUTPUT CAPACITORS
The ADP1610 requires input and output bypass capacitors to
supply transient currents while maintaining constant input and
output voltage. To prevent noise at the ADP1610 input, a low
ESR (equivalent series resistance), 10 μF or greater input capacitor
is to be used. Place the capacitor between IN and GND as close to
the ADP1610 as possible. Ceramic capacitors are preferred because
of their low ESR characteristics. Alternatively, use a high value,
medium ESR capacitor in parallel with a 0.1 μF low ESR capacitor
as close to the ADP1610 as possible.
The output capacitor maintains the output voltage and supplies
current to the load while the ADP1610 switch is on. The value
and characteristics of the output capacitor greatly affect the
output voltage ripple and stability of the regulator. Use a low
ESR output capacitor; ceramic dielectric capacitors are preferred.
The input bypass capacitor limits the high frequency impedance
of the input voltage source. The value of this capacitor may
need to be increased if the wire length from the input voltage
source to the applications board is longer than 18” to optimize
the transient performance.
116
216
128
290
75
Maximum
DCR (mΩ)
109
182
60
87
150
Height (mm)
1.2
1.2
3.0
2.0
3.5
3.5
2.9
2.9
2.0
2.0
Comments
Used only for 3.3 V
input and 5 V output
Used for 9 V, 10 V,
and 12 V outputs
Used for inputs and
outputs of 5 V
ADP1610