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參數(shù)資料
| 型號： | LTC3400BES6#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.85 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LTC3400BES6#PBF |
LTC3400/LTC3400B
6
3400fa
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3400/LTC3400B
demands careful attention to board layout. You will not get
advertised performance with careless layout. Figure 2
shows the recommended component placement. A large
ground pin copper area will help to lower the chip tempera-
ture. A multilayer board with a separate ground plane is
ideal, but not absolutely necessary.
APPLICATIO S I FOR ATIO
WU
UU
II
VD
fL
D
OUT MAX
P
IN
()
–
–
=
()
η
2
1
where:
η = estimated efficiency
IP = peak current limit value (0.6A)
VIN = input (battery) voltage
D = steady-state duty ratio = (VOUT – VIN)/VOUT
f = switching frequency (1.2MHz typical)
L = inductance value
SW
GND
FB
1
2
3
6
5
4
VIN
VOUT
SHDN
(OPTIONAL)
3400 F02
VOUT
VIN
RECOMMENDED COMPONENT PLACEMENT. TRACES
CARRYING HIGH CURRENT ARE DIRECT. TRACE AREA AT
FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Figure 2. Recommended Component Placement
for Single Layer Board
COMPONENT SELECTION
Inductor Selection
The LTC3400/LTC3400B can utilize small surface mount
and chip inductors due to their fast 1.2MHz switching
frequency. A minimum inductance value of 3.3
H is
necessary for 3.6V and lower voltage applications and
4.7
H for output voltages greater than 3.6V. Larger values
INDUCTANCE (
H)
3
60
OUTPUT
CURRENT
(mA)
80
110
120
160
7
11 13
21
180
140
59
15 17 19
23
3400 F03
VIN =1.2V
VOUT = 3V
VOUT = 3.3V
VOUT = 3.6V
VOUT = 5V
Figure 3. Maximum Output Current vs
Inductance Based On 90% Efficiency
of inductance will allow greater output current capability
by reducing the inductor ripple current. Increasing the
inductance above 10
H will increase size while providing
little improvement in output current capability.
The approximate output current capability of the LTC3400/
LTC3400B versus inductance value is given in the equa-
tion below and illustrated graphically in Figure 3.
burst threshold, the LTC3400 will resume continuous
PWM operation seamlessly. Referring to the Block Dia-
gram, an optional capacitor (CFF) between VOUT and FB in
some circumstances can reduce the peak-to-peak VOUT
ripple and input quiescent current during Burst Mode
operation. Typical values for CFF range from 15pF to
220pF. The LTC3400B does not use Burst Mode operation
and features continous operation at light loads, eliminat-
ing low frequency output voltage ripple at the expense of
light load efficiency.
OPERATIO
U
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