參數(shù)資料
型號: LTC3419IDD-1#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 1.2 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WEED-1, DFN-8
文件頁數(shù): 5/16頁
文件大?。?/td> 266K
代理商: LTC3419IDD-1#TRPBF
LTC3419
13
3419fa
APPLICATIONS INFORMATION
Figure 2. LTC3419 Layout Diagram (See Board Layout Checklist)
Figure 3. LTC3419 Suggested Layout
VIN
RUN2
RUN1
LTC3419
VFB2
SW2
SW1
VFB1
CF2
CF1
GND
VIN
2.5V TO 5.5V
VOUT2
VOUT1
3419 F02
R3
R1
R4
L2
L1
R2
COUT2
C1
COUT1
BOLD LINES INDICATE HIGH CURRENT PATHS
MODE
L1
3419 F03
L2
CIN
COUT1
COUT2
VOUT2
VOUT1
GND
R2
R1
R3
R4
CF1
CF2
VFB1
RUN1
MODE
SW1
VFB2
RUN2
SW2
VIN
VIA TO GND
VIA TO VIN
Design Example
As a design example, consider using the LTC3419 in a
portable application with a Li-Ion battery. The battery
provides a VIN ranging from 2.8V to 4.2V. The load on
each channel requires a maximum of 600mA in active
mode and 2mA in standby mode. The output voltages are
VOUT1 = 2.5V and VOUT2 = 1.8V.
Start with channel 1. First, calculate the inductor value
for about 40% ripple current (240mA in this example) at
maximum VIN. Using a derivation of Equation 1:
L
V
MHz
mA
V
1
25
2 25
240
1
25
42
18
=
=
.
. (
)
.
.7
7
μH
For the inductor, use the closest standard value of
2.2μH.
A 10μF ceramic capacitor should be more than sufcient
for this output capacitor. As for the input capacitor, a
typical value of CIN = 10μF should sufce, as the source
impedance of a Li-Ion battery is very low.
The feedback resistors program the output voltage. To
maintain high efciency at light loads, the current in these
resistors should be kept small. Choosing 10μA with the
0.6V feedback voltage makes R1~60k. A close standard
1% resistor is 59k. Using Equation 2.
R
V
Rk
OUT
2
06
1
1 187
=
=
.
An optional 22pF feedback capacitor (CF1) may be used
to improve transient response.
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