參數(shù)資料
型號(hào)： LT1308IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Single Cell High Current Micropower 600kHz Boost DC/DC Converter
中文描述： SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 5/8頁(yè)
文件大小： 266K
代理商： LT1308IS8
5
LT1308
PI
FU
CTIO
N
S
U
U
SW (Pin 5):
Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
V
IN
(Pin 6):
Supply Pin. Must have local bypass capacitor
right at the pin, connected directly to ground.
LBI (Pin 7):
Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV. Low-battery detector does not function with
SHDN pin grounded. If not used, float LBI pin.
LBO (Pin 8):
Low-Battery Detector Output. Open collec-
tor, can sink 10
μ
A. A 1M
pullup is recommended. LBO
is high impedance when SHDN is grounded.
BLOCK DIAGRA
M
W
–
+
–
+
–
+
–
+
–
+
+
+
Σ
COMPARATOR
RAMP
GENERATOR
R
BIAS
V
C
1
g
m
Q2
×
10
R3
30k
Q1
FB
FB
2
ENABLE
200mV
A = 3
FF
A2
A1
ERROR
AMPLIFIER
A4
0.03
DRIVER
SW
5
GND
1308 BD
Q3
Q
S
600kHz
OSCILLATOR
LBO
8
LBI
7
SHDN
3
SHUTDOWN
4
R6
40k
R5
40k
R1
(EXTERNAL)
R4
140k
V
IN
6
V
IN
V
OUT
R2
(EXTERNAL)
LAYOUT HINTS
The LT1308 switches current at high speed, mandating
careful attention to layout for proper performance. You will
not get advertised performance with careless layouts.
Figure 2 shows recommended component placement.
Follow this closely in your PC layout. Note the direct path
of the switching loops. Input capacitor C
IN
must be placed
close (<5mm) to the IC package. As little as 10mm of wire
or PC trace from C
IN
to V
IN
will cause problems such as
inability to regulate or oscillation. A 10
μ
F ceramic bypass
capacitor is the only input capacitance required provided
the battery has a low inductance path to the circuit The
battery itself provides the bulk capacitance the device
requires for proper operation. If the battery is located some
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 2. Recommended Component Placement. Traces
Carrying High Current Are Direct. Trace Area at FB Pin and V
C
Pin is Kept Low. Lead Length to Battery Should Be Kept Short.
Ground Plane Should Be Placed Under All Components
1
2
3
4
8
7
6
5
L
C
IN
C
OUT
D
LT1308
V
OUT
V
IN
GND
MULTIPLE
VIAs
GROUND PLANE
1308 F02
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