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参数资料
| 型号： | LT3694-1IUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 8/28页 |
| 文件大小： | 276K |
| 代理商： | LT3694-1IUFD#TRPBF |
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LT3694/LT3694-1
16
36941fa
operating voltage of an LT3694 application is limited by
the minimum input voltage (4V) and by the maximum
duty cycle as outlined in a previous section. For proper
start-up, the minimum input voltage is also limited by the
boost circuit. If the input voltage is ramped slowly, or the
LT3694 is turned on with its EN/UVLO or TRK/SS pin when
the output is already in regulation, then the boost capacitor
may not be fully charged. Because the boost capacitor is
charged with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly. This minimum load will depend
on input and output voltages, and on the arrangement of
the boost circuit. The minimum load generally goes to
zero once the circuit has started. Figure 5 shows a plot
of input voltage to start and to run as a function of load
current. In many cases the discharged output capacitor
will present a load to the switcher, which will allow it to
start. The plots show the worst-case situation in which
VIN is ramping very slowly. For lower start-up voltage, the
boost diode can be tied to VIN, however, this restricts the
input range to one-half of the absolute maximum rating
of the BST pin.
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
300mV above VOUT. At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT3694, requiring a higher
input voltage to maintain regulation.
Internal Undervoltage Lockout
The LT3694 features an internal undervoltage lockout that
will shut off all three regulators if the input voltage drops
too low to maintain regulation of the internal circuitry. This
lockout trips when VIN drops below 3.8V (typ).
Enable and Programmable Undervoltage Lockout
The EN/UVLO pin provides both logic enable and pro-
grammable undervoltage lockout functions. There are
two thresholds on the EN/UVLO pin. The first threshold is
at 500mV (typ). When EN/UVLO is below this threshold,
the LT3694 is in complete shutdown and the quiescent
current drops below 2μA.
APPLICATIONS INFORMATION
Figure 5. The Minimum Input Voltage Depends on
Output Voltage, Load Current and Boost Circuit
36941 F05
LOAD CURRENT (A)
0.001
INPUT
VOL
TAGE
(V)
3.8
4.0
4.2
1
3.6
3.4
3.0
0.01
0.1
3.2
5.0
4.4
4.6
4.8 TO START
TO RUN
VOUT = 3.3V
fSW = 800kHz
LOAD CURRENT (A)
0.001
6.0
INPUT
VOL
TAGE
(V)
6.5
0.01
0.1
1
5.5
5.0
4.5
4.0
7.0
VOUT = 5V
fSW = 800kHz
TO RUN
TO START
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3694EFE#PBF | 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT3694EFE#TRPBF | 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT3694EFE-1#PBF | 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT3694EFE-1#TRPBF | 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT3694EFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck Regulator With Dual LDO |
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