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參數(shù)資料
| 型號： | LT1308 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single Cell High Current Micropower 600kHz Boost DC/DC Converter |
| 中文描述： | 單細(xì)胞微600kHz的高電流升壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LT1308 |
6
LT1308
APPLICATIO
S I
FOR
ATIO
U
distance from the circuit, an additional input capacitor may
be required. A 220
μ
F aluminum electrolytic unit works well
in these cases. This capacitor need not have low ESR.
W
U
U
LOW-BATTERY DETECTOR
The LT1308’s low-battery detector is a simple PNP input
gain stage with an open collector NPN output. The nega-
V
IN
Q3
SHUTDOWN
CURRENT
R2
400k
400k
Q2
1308 F03
Q1
START-UP
CURRENT
SHDN
Figure 3. Shutdown Circuit
tive input of the gain stage is tied internally to a 200mV
reference. The positive input is the LBI pin. Arrangement
as a low-battery detector is straightforward. Figure 4
details hookup. R1 and R2 need only be low enough in
value so that the bias current of the LBI pin doesn’t cause
large errors. For R2, 100k is adequate. The 200mV refer-
ence can also be accessed as shown in Figure 5.
OPERATION FROM A LABORATORY POWER SUPPLY
If a lab supply is used, the leads used to connect the circuit
to the supply can have significant inductance at the
LT1308’s switching frequency. As in the previous situa-
tion, an electrolytic capacitor may be required at the circuit
in order to reduce the AC impedance of the input suffi-
ciently. An alternative solution is to attach the circuit
directly to the power supply at the supply terminals,
without the use of leads. The power supply’s output
capacitance will then provide the bulk capacitance the
LT1308 circuit requires.
SHUTDOWN PIN
The LT1308 has a shutdown pin (SHDN) that must be
grounded to shut the device down or tied to a voltage equal
or greater than V
IN
to operate. The shutdown circuit is
shown in Figure 3.
Note that allowing SHDN to float turns on both the start-
up current (Q2) and the shutdown current (Q3) for V
IN
>
2V
BE
. The LT1308 doesn’t know what to do in this situation
and behaves erratically. SHDN voltage above V
IN
is al-
lowed. This merely reverse-biases Q3’s base emitter junc-
tion, a benign condition.
GSM PHONES
The LT1308 is suitable for converting a single Li-Ion cell
to 5V for powering GSM RF power stages. Figure 6 details
a Li-Ion to 5V converter circuit using frequency compen-
sation optimized for a typical GSM pulsed load. Figure 7
details transient response of Figure 6’s circuit with a
100mA to 1A pulsed load. A slower time sweep is used to
show several transmit pulses in Figure 8. At a V
IN
of 2.7V,
additional output capacitance is recommended to help
minimize V
OUT
droop. Figure 9 shows V
OUT
with an input
voltage of 2.7V. Figure 10 expands the horizontal sweep
speed to 500
μ
s/division to show detail of one transmit
pulse.
Figure 5. Accessing 200mV Reference
Figure 4. Setting Low-Battery Detector Trip Point
V
IN
V
BAT
LT1308
LBI
LBO
200k
10
μ
F
GND
10k
1308 F05
2N3906
V
200mV
+
LBO
LBI
TO PROCESSOR
R1
1M
R2
100k
V
IN
V
BAT
LT1308
1308 F04
3.3V
GND
200mV
INTERNAL
REFERENCE
–
+
R1 =V
LB
– 200mV
2
μ
A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1308A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Current, Micropower Single Cell, 600kHz DC/DC Converters |
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| LT1308ACF | 功能描述:IC REG BOOST 5V 1A 14TSSOP 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LT1308ACF#PBF | 功能描述:IC REG BOOST 5V 1A 14TSSOP RoHS:是 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LT1308ACF#TR | 功能描述:IC REG BOOST 5V 1A 14TSSOP 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
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