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参数资料
| 型号： | LTC3531ES6-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC 3V TSOT23 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 200mA |
| 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-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3531/
LTC3531-3.3/LTC3531-3
OPERATIO
The LTC3531, LTC3531-3.3 and LTC3531-3 synchro-
nous buck-boost converters utilize a Burst Mode control
technique to achieve high ef?ciency over a wide dynamic
range of load currents. A 2% accurate comparator is
used to monitor the output voltage. If V OUT is above its
programmed reference threshold no switching occurs and
only quiescent current is drawn from the power source
(sleep mode). When V OUT drops below the reference
threshold the IC “wakes up”, switching commences, and
the output capacitor is charged. The value of the output
capacitor, the load current, and the comparator hysteresis
(~1%) determines the number of current pulses required
to pump-up the output capacitor before the part returns
to sleep.
In order to determine the best operating mode for the
converter, the LTC3531 contains a second comparator
that monitors the relative voltage difference between V IN
and V OUT . Input and output voltages in the various modes
as well as typical inductor currents are shown in Figure 1.
Regions of the current waveforms where switches A and
D are on provide the highest ef?ciency since energy is
transferred directly from the input source to the output.
Boost Mode
If V IN is ~400mV below V OUT , the LTC3531 operates in
boost or step-up mode. Referring to Figure 1 (left side)
when V OUT falls below its regulation voltage, switches A
and C are turned on (V IN is applied across the inductor)
and current is ramped until I PEAK is detected. When this
occurs, C is turned off, D is turned on and current is deliv-
ered to the output capacitor (V IN – V OUT is applied across
the inductor). Inductor current falls when D is on, until an
I VALLEY is detected. Terminating at I VALLEY , rather than I ZERO ,
results in an increased load current capability for a given
peak current. This AC then AD switch sequence is repeated
until the output is pumped above its regulation voltage, a
?nal I ZERO is detected, and the part returns to sleep mode
(I VALLEY is ignored and I ZERO is used in all modes once
V OUT is above its programmed value).
4-Switch Mode
If (V OUT – 400mV) < ~V IN < (V OUT + 800mV), the LTC3531
operates in 4-switch step-up/down mode. Returning to
Figure 1 (center) when V OUT falls below its regulation volt-
age, switches A and C are turned on and current is ramped
until I PEAK is detected. As with Boost Mode operation, C
is then turned off, D is turned on and current is delivered
to the output. When A and D are on, the inductor current
slope is dependant on the relationship between V IN , V OUT ,
and the R DSON of the switches. In 4-switch mode, a t OFF
timer (approximately 3μs) is used to terminate the AD
pulse. Once the t OFF timer expires, switch A is turned off,
B is turned on and inductor current is ramped down (V OUT
is applied across the inductor) until I VALLEY is detected.
This sequence is repeated until the output is regulated,
BD switches are turned on, and a ?nal I ZERO is detected.
Anticross conduction circuitry in all modes ensures the
P-channel MOSFET and N-channel MOSFET switch pairs (A
and B or D and C) are never turned on simultaneously.
V IN
A
D
V OUT
V OUT
V IN
V IN
L
SW1
SW2
I MAX
B
C
I PEAK
I VALLEY
I ZERO
t OFF
t OFF
t OFF
AC AD
AC
AD
AC AD BD AC AD
BD AC
AD
BD
AD
BD
AD BD
BOOST MODE
4SW MODE
BUCK MODE
3531 F01
Figure 1. Voltage and Current Waveforms
3531fb
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3532 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3532EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
| LTC3532EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 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 |
| LTC3532EDD#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3532EDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
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