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参数资料
| 型号： | LT3682IDD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件页数： | 13/24页 |
| 文件大小： | 253K |
| 代理商： | LT3682IDD#TRPBF |
LT3682
20
3682f
APPLICATIONS INFORMATION
Synchronization
To select Low Ripple Burst Mode operation, tie the SYNC
pin below 0.3V (this can be ground or a logic output).
Synchronizing the LT3682 oscillator to an external
frequency can be done by connecting a square wave (with
20% to 80% duty cycle) to the SYNC pin. The square wave
amplitude should have valleys that are below 0.3V and
peaks that are above 0.8V (up to 6V).
The LT3682 will not enter Burst Mode at low output loads
while synchronized to an external clock, but instead will
skip pulses to maintain regulation.
The maximum load current that the part can supply is
reduced when a clock signal is applied to SYNC.
The LT3682 may be synchronized over a 300kHz to 2.2MHz
range. The RT resistor should be chosen to set the LT3682
switching frequency 20% below the lowest synchronization
input. For example, if the synchronization signal will be
360kHz, the RT should be chosen for 300kHz. To assure
reliable and safe operation the LT3682 will only synchronize
when the output voltage is near regulation as indicated
by the PG ag. It is therefore necessary to choose a large
enough inductor value to supply the required output current
at the frequency set by the RT resistor. See the Inductor
Selection section for more information. It is also important
Figure 9. Diode D4 Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output.
It Also Protects the Circuit from a Reversed Input.
The LT3682 Runs Only When the Input is Present
3682 F09
LT3682
VIN
VC
BACKUP
D4
MBRS140
VOUT
VIN
BD
GND
SW
DA
FB
RUN/SS
BOOST
PGND
Figure 8. The LT3682 Reduces its Frequency to
Protect Against Shorted Output with 36V Input
3682 F08
IL
500mA/DIV
VSW
20V/DIV
0V
0A
2μs/DIV
to note that slope compensation is set by the RT value:
to avoid subharmonics, calculate the minimum inductor
value using the frequency determined by RT.
Shorted and Reversed Input Protection
If the inductor is chosen so that it won’t saturate excessively,
the LT3682 will tolerate a shorted output. When operating
in short-circuit condition, the LT3682 will reduce its
frequency until the valley current is at a typical value of
1.6A (see Figure 8). There is another situation to consider
in systems where the output will be held high when the
input to the LT3682 is absent. This may occur in battery
charging applications or in battery backup systems where
a battery or some other supply is diode OR-ed with the
LT3682’s output. If the VIN pin is allowed to oat and the
RUN/SS pin is held high (either by a logic signal or because
it is tied to VIN), then the LT3682’s internal circuitry will
pull its quiescent current through its SW pin. This is ne
if your system can tolerate a few mA in this state. If you
ground the RUN/SS pin, the SW pin current will drop to
essentially zero. However, if the VIN pin is grounded while
the output is held high, then parasitic diodes inside the
LT3682 can pull large currents from the output through
the SW pin and the VIN pin. Figure 9 shows a circuit that
will run only when the input voltage is present and that
protects against a shorted or reversed input.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3684 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.8MHz Step-Down Switching Regulator |
| LT3684EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.8MHz Step-Down Switching Regulator |
| LT3684EDD#PBF | 功能描述:IC REG BUCK ADJ 2A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3684EDD#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.8MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.8MHZ, DFN-10 |
| LT3684EDD#TRPBF | 功能描述:IC REG BUCK ADJ 2A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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