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LTM4605 Datasheet(PDF) 11 Page - Linear Technology

Part # LTM4605
Description  High Effi ciency Buck-Boost DC/DC 關Module
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

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LTM4605
11
4605fa
APPLICATIONS INFORMATION
For a buck converter, the switching duty-cycle can be
estimated as:
D
V
V
OUT
IN
=
Without considering the inductor current ripple, the RMS
current of the input capacitor can be estimated as:
I
I
DD
CIN RMS
OUT MAX
()
()
•• (
)
=−
η
1
In the above equation,
η is the estimated efficiency of the
power module. CIN can be a switcher-rated electrolytic
aluminum capacitor, OS-CON capacitor or high volume
ceramic capacitors. Note the capacitor ripple current rat-
ings are often based on temperature and hours of life. This
makes it advisable to properly derate the input capacitor,
or choose a capacitor rated at a higher temperature than
required. Always contact the capacitor manufacturer for
derating requirements.
Output Capacitors
In boost mode, the discontinuous current shifts from the
input to the output, so the output capacitor COUT must be
capable of reducing the output voltage ripple.
For boost and buck modes, the steady ripple due to charg-
ing and discharging the bulk capacitance is given by:
V
IV
V
C
RIPPLE BOOST
OUT MAX
OUT
IN MIN
OUT
,
()
(
)
=
()
•••
Vf
OUT
V
VV
V
LC
V
RIPPLE BUCK
OUT
IN MAX
OUT
OUT
,
()
••
=
()
8
IIN MAX
f
()
2
The steady ripple due to the voltage drop across the ESR
(effective series resistance) is given by:
V
I
ESR
ESR BUCK
L MAX
,(
)
V
I
ESR
ESR BOOST
L MAX
,(
)
=
The LTM4605 is designed for low output voltage ripple.
The bulk output capacitors defined as COUT are chosen
with low enough ESR to meet the output voltage ripple
and transient requirements. COUT can be a low ESR tanta-
lum capacitor, a low ESR polymer capacitor or a ceramic
capacitor. Multiple capacitors can be placed in parallel to
meet the ESR and RMS current handling requirements. The
typical capacitance is 300μF. Additional output filtering may
be required by the system designer, if further reduction of
output ripple or dynamic transient spike is required. Table
3 shows a matrix of different output voltages and output
capacitors to minimize the voltage droop and overshoot
at a current transient.
Inductor Selection
The inductor is chiefly decided by the required ripple cur-
rent and the operating frequency. The inductor current
ripple
ΔIL is typically set to 20% to 40% of the maximum
inductor current. In the inductor design, the worst cases
in continuous mode are considered as follows:
L
VV
V
Vf I
BOOST
IN
OUT MAX
IN
OUT MAX
OUT
()
••
()
()
(M
MAX
Ripple
) •%
L
VV
V
Vf I
BUCK
OUT
IN MAX
OUT
IN MAX
OUT M
()
••
()
()
( A
AX
Ripple
) •%
where:
f is operating frequency, Hz
Ripple% is allowable inductor current ripple, %
VOUT(MAX) is maximum output voltage, V
VIN(MAX) is maximum input voltage, V
VOUT is output voltage, V
IOUT(MAX) is maximum output load current, A
The inductor should have low DC resistance to reduce the
I2R losses, and must be able to handle the peak inductor
current without saturation. To minimize radiated noise,
use a toroid, pot core or shielded bobbin inductor. Please
refer to Table 3 for the recommended inductors for dif-
ferent cases.


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