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參數(shù)資料
| 型號(hào)： | LT1613 |
| 廠(chǎng)商： | Linear Technology Corporation |
| 英文描述： | 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 |
| 中文描述： | 1.4MHz的，單細(xì)胞的DC / DC轉(zhuǎn)換器在5引腳SOT - 23 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 257K |
| 代理商： | LT1613 |
4
LT1613
PI
FU
CTIO
N
S
U
U
SW (Pin 1):
Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
GND (Pin 2):
Ground. Tie directly to local ground plane.
FB (Pin 3):
Feedback Pin. Reference voltage is 1.23V.
Connect resistive divider tap here. Minimize trace area at
FB. Set V
OUT
according to V
OUT
= 1.23V(1 + R1/R2).
SHDN (Pin 4):
Shutdown Pin. Tie to 1V or more to enable
device. Ground to shut down.
V
IN
(Pin 5):
Input Supply Pin. Must be locally bypassed.
BLOCK DIAGRA
M
W
–
+
–
+
FF
R
Q
S
0.15
SW
DRIVER
COMPARATOR
2
SHUTDOWN
SHDN
4
1
–
+
Σ
RAMP
GENERATOR
R
C
C
C
1.4MHz
OSCILLATOR
GND
1613 BD
R6
40k
R4
140k
R3
30k
Q2
x10
Q1
Q3
R2
(EXTERNAL)
R1
(EXTERNAL)
R5
40k
V
OUT
V
IN
V
IN
5
FB
3
FB
A2
A1
g
m
The LT1613 is a current mode, internally compensated,
fixed frequency step-up switching regulator. Operation
can be best understood by referring to the Block Diagram.
Q1 and Q2 form a bandgap reference core whose loop is
closed around the output of the regulator. The voltage
drop across R5 and R6 is low enough such that Q1 and Q2
do not saturate, even when V
IN
is 1V. When there is no
load, FB rises slightly above 1.23V, causing V
C
(the error
amplifier’s output) to decrease. Comparator A2’s output
stays high, keeping switch Q3 in the off state. As increased
output loading causes the FB voltage to decrease, A1’s
output increases. Switch current is regulated directly on a
cycle-by-cycle basis by the V
C
node. The flip flop is set at
the beginning of each switch cycle, turning on the switch.
When the summation of a signal representing switch
current and a ramp generator (introduced to avoid
subharmonic oscillations at duty factors greater than
OPERATIOU
50%) exceeds the V
C
signal, comparator A2 changes
state, resetting the flip flop and turning off the switch.
More power is delivered to the output as switch current is
increased. The output voltage, attenuated by external
resistor divider R1 and R2, appears at the FB pin, closing
the overall loop. Frequency compensation is provided
internally by R
C
and C
C
. Transient response can be opti-
mized by the addition of a phase lead capacitor C
PL
in
parallel with R1 in applications where large value or low
ESR output capacitors are used.
As the load current is decreased, the switch turns on for a
shorter period each cycle. If the load current is further
decreased, the converter will skip cycles to maintain
output voltage regulation. If the FB pin voltage is increased
significantly above 1.23V, the LT1613 will enter a low
power state where quiescent current falls to approxi-
mately 100
μ
A.
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| LT1613CS5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.9V to 10V 5-Pin TSOT-23 |
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| LT1613-CS5#TR | 制造商:Linear Technology 功能描述: |
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