LTC3410B_15 Datasheet, PDF (8/16 Pages) Linear Technology – 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

LTC3410B
APPLICATIO S I FOR ATIO
V_IN
2.7V
TO 5.5V
C_IN
2.2µF
CER
V_IN
SW
LTC3410B
RUN
V_FB
GND
4.7µH
10pF
232k
464k
3410 F01
V_OUT
1.2V
C_OUT
2.2µF
CER
Figure 1. High Efficiency Step-Down Converter
The basic LTC3410B application circuit is shown in Fig-
ure 1. External component selection is driven by the load
requirement and begins with the selection of L followed by
C_IN and C_OUT.
Inductor Selection
For most applications, the value of the inductor will fall in
the range of 2.2µH to 4.7µH. Its value is chosen based on
the desired ripple current. Large value inductors lower
ripple current and small value inductors result in higher
ripple currents. Higher V_IN or V_OUT also increases the ripple
current as shown in Equation 1. A reasonable starting point
for setting ripple current is ∆I_L = 120mA (40% of 300mA).
∆I_L
=
1
(^f)(^L)
V_OUT
⎛⎝⎜_1−
V_OUT
V_IN
⎞
⎠⎟
(1)
The DC current rating of the inductor should be at least
equal to the maximum load current plus half the ripple
current to prevent core saturation. Thus, a 360mA rated
inductor should be enough for most applications (300mA
+ 60mA). For better efficiency, choose a low DC-resistance
inductor.
Inductor Core Selection
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Tor-
oid or shielded pot cores in ferrite or permalloy materials
are small and don’t radiate much energy, but generally cost
more than powdered iron core inductors with similar
electrical characteristics. The choice of which style induc-
tor to use often depends more on the price vs size require-
ments and any radiated field/EMI requirements than on
what the LTC3410B requires to operate. Table 1 shows
some typical surface mount inductors that work well in
LTC3410B applications.
Table 1. Representative Surface Mount Inductors
MAX DC
MANUFACTURER PART NUMBER VALUE CURRENT DCR HEIGHT
Taiyo Yuden
CB2016T2R2M
CB2012T2R2M
LBC2016T3R3M
2.2µH 510mA 0.13Ω 1.6mm
2.2µH 530mA 0.33Ω 1.25mm
3.3µH 410mA 0.27Ω 1.6mm
Panasonic
ELT5KT4R7M 4.7µH 950mA 0.2Ω 1.2mm
Sumida
CDRH2D18/LD 4.7µH 630mA 0.086Ω 2mm
Murata
LQH32CN4R7M23 4.7µH 450mA 0.2Ω 2mm
Taiyo Yuden
NR30102R2M
NR30104R7M
2.2µH 1100mA 0.1Ω 1mm
4.7µH 750mA 0.19Ω 1mm
FDK
FDKMIPF2520D 4.7µH 1100mA 0.11Ω 1mm
FDKMIPF2520D 3.3µH 1200mA 0.1Ω 1mm
FDKMIPF2520D 2.2µH 1300mA 0.08Ω 1mm
C_IN and C_OUT Selection
In continuous mode, the source current of the top MOS-
FET is a square wave of duty cycle V_OUT/V_IN. To prevent
large voltage transients, a low ESR input capacitor sized
for the maximum RMS current must be used. The maxi-
mum RMS capacitor current is given by:
( ) _{CIN required IRMS ≅ IOMAX} ⎡⎣V_OUT
V_IN − V_OUT
V_IN
⎤⎦^1/2
3410bfa
8