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参数资料
| 型号： | LTC3534EGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.5A 16SSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 7 V |
| 输入电压： | 2.4 V ~ 7 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1MHz |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SSOP |
LTC3534
OPERATION
I OUT(MAX)BURST ? BOOST ≈
125 ? V IN
η ?I LOAD
25μA + I LOAD
In Burst Mode operation the typical maximum average
output currents in the three operating regions, buck, four
switch, and boost are given by:
I OUT(MAX)BURST–BUCK ≈ 100mA;
Burst Mode operation – buck region: V IN > V OUT
I OUT(MAX)BURST–FOUR_SWITCH ≈ 125mA;
Burst Mode operation – four switch region: V IN ≈ V OUT
mA;
V OUT
Burst Mode operation – boost region: V IN < V OUT
The efficiency below 1mA becomes dominated primarily
by the quiescent current. The Burst Mode operation ef-
ficiency is given by:
Efficiency ?
where h is typically 90% during Burst Mode operation.
A graph of Burst Mode operation maximum output current
vs V IN (for V OUT = 5V) is provided in the Typical Perfor-
mance Characteristics section.
Burst Mode Operation to Fixed Frequency Transient
Response
In Burst Mode operation, the compensation network is
not used and V C is disconnected from the error amplifier.
V IN
13
During long periods of Burst Mode operation, leakage
currents in the external components or on the PC board
could cause the compensation capacitor to charge (or
discharge), which could result in a large output transient
when returning to fixed frequency mode operation, even
at the same load current. To prevent this, the LTC3534
incorporates an active clamp circuit that holds the voltage
on V C at an optimal voltage during Burst Mode operation.
This minimizes any output transient when returning to
fixed frequency mode operation. For optimum transient
response, Type III compensation is also recommended
to broad band the control loop and roll off past the two
pole response of the output LC filter. (See Closing the
Feedback Loop).
Soft-Start
The soft-start function is combined with shutdown. When
the RUN/SS pin is brought above 1V typical, the LTC3534
is enabled but the error amplifier duty cycle is clamped
from V C . A detailed diagram of this function is shown in
Figure 3. The components R SS and C SS provide a slow
ramping voltage on RUN/SS to provide a soft-start func-
tion. To ensure that V C is not being clamped, RUN/SS
must be raised to 2.4V or above. The IC must be enabled
(even with a soft-start) commanding PWM mode. Once
the LTC3534 is in regulation, then Burst Mode operation
can be commanded.
ENABLE
SIGNAL
R SS
RUN/SS
2
C SS
+
ERROR
AMP
–
1V
FB
15
V OUT
11
R1
CHIP
ENABLE
+
–
1V
V CI
TO PWM
COMPARATORS
V C
14
C P1
R2
3534 F03
Figure 3. Soft-Start Circuitry
3534fb
For more information www.linear.com/LTC3534
11
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| LTC3535 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter |
| LTC3535EDD#PBF | 功能描述:IC REG BST SYNC ADJ 0.55A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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