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參數(shù)資料
| 型號： | LT1306 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Synchronous, Fixed Frequency Step-Up DC/DC Converter |
| 中文描述： | 同步，固定頻率升壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 213K |
| 代理商： | LT1306 |
8
LT1306
OPERATIOU
In boost operation, X5 drives the rectifier Q2 into satura-
tion. The voltage across the rectifier is V
CESAT
. As the
inductor current decreases, Q2’s base drive also de-
creases. X5 ceases supplying base current to Q2 when the
inductor current falls to zero.
If V
IN
> V
O
, Q2 will no longer be driven into saturation.
Instead the voltage across Q2 is allowed to increase so that
the inductor voltage reverses polarity as Q1 switches.
Since the inductor voltage is bipolar, volt-second balance
can be maintained regardless of the input voltage. The
LT1306 is therefore capable of operating as a step-down
regulator with the basic boost topology. Input
start-up current is also well controlled since the inductor
current cannot increase during Q1’s off-time with negative
inductor voltage.
The rectifier voltage drop depends on both the input and
the output voltages. Efficiency in the step-down mode is
less than that of a linear regulator. For sustained step-
down operation, the maximum output current will be
limited by the package thermal characteristics.
MODE
1306 F04
V
O
+ 0.1V
V
O
V
IN
BOOST
STEPDOWN
Figure 4. DC Transfer Characteristics of the Mode Control
Comparator Plotted with V
IN
as an Independent Variable.
V
O
is Considered Fixed.
MODE
0
1306 F03
V
IN
– 0.1V V
IN
V
O
BOOST
STEPDOWN
Figure 3. DC Transfer Characteristics of the Mode Control
Comparator Plotted with V
O
as an Independent Variable.
V
IN
is Considered Fixed.
A hysteretic comparator in driver X5 controls the mode
of operation. DC transfer characteristics of the compara-
tor are shown in Figure 3 and Figure 4.
A logic low at the S/S pin (Pin 8) initiates shutdown. First,
all circuit blocks in the LT1306 are switched off. The
synchronous rectifier Q2 and its driver are kept on to
allow stored inductive energy to flow to the output. As V
O
drops below V
IN
, the voltage across the rectifier Q2
increases so that the inductor voltage reverses. Inductor
current continues to fall to zero. Driver X5 then turns off
and the rectifier, Q2, becomes an open circuit. The
LT1306 dissipates only 9
μ
A in shutdown.
The LT1306 is guaranteed to start with a minimum V
IN
of
1.8V. Comparator A5 senses the input voltage and gen-
erates an undervoltage lockout (UVLO) signal if V
IN
falls
below this minimum. In UVLO, V
C
is pulled low and Q1
stops switching. The LT1306 draws 160
μ
A from the
input.
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| LT1306ES8#TR | 功能描述:IC REG BOOST 5V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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| LT1307 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter |
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