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参数资料
| 型号： | LTC3520EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.2 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 600mA，1A |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3520
OPERATION
f ( kHz ) =
COMMON FUNCTIONS
Oscillator
The buck-boost and buck converters operate from a com-
mon internal oscillator. The switching frequency for both
converters is set by the value of an external resistor, R T ,
located between the R T pin and ground according to the
following equation:
54, 000
R T ( k Ω )
Gain Block
The LTC3520 contains a gain block (pins A IN and A OUT )
that can be used as a low battery indicator or power-good
comparator for either the buck or buck-boost output volt-
age. Typical circuits for these applications are shown in
Figure 2. A small-valued capacitor can be added from A OUT
to GND to provide ?ltering and prevent glitching during slow
transitions through the threshold region. The gain block
is not disabled by the undervoltage lockout. This allows
the uncommitted ampli?er to be utilized as a low battery
indicator down to a supply voltage of 1.6V typically.
The A OUT pin is not an open-drain output. Rather, it is a
push-pull output that can both sink and source current.
The uncommitted ampli?er is internally powered by the
higher of either the SV IN or V OUT1 voltages. This restricts
the maximum voltage on the A OUT pin to either the input
supply voltage or the buck-boost output voltage, which-
ever is larger.
Alternatively, the gain block can be utilized as an LDO
with the addition of an external PNP as shown in
Figure 3. The LDO is convenient for applications requiring
a third output (possibly a low current 2.5V or a quiet 3V
supply). An external PMOS can be used in place of the PNP,
but a much larger output capacitor is required to ensure
stability at light load. The gain block has an independent
shutdown pin ( SD3 ) and should be disabled when not in
use to reduce quiescent current.
Thermal Shutdown
If the die temperature exceeds 150oC both converters
will be disabled. All power devices will be turned off and
all switch nodes will be high impedance. The soft-start
circuits for both converters are reset during thermal
shutdown to provide a smooth recovery once the over-
temperature condition is eliminated. Both converters will
restart (if enabled) when the die temperature drops to
approximately 140oC.
Undervoltage Lockout
If the supply voltage decreases below 2V (typical) then
both converters will be disabled and all power devices will
be turned off. The soft-start circuits for both converters
are reset during undervoltage lockout to provide a smooth
restart once the input voltage rises above the undervoltage
lockout threshold.
3.3V
A OUT
V OUT
LBO
V BAT
A OUT
LTC3520
PGOOD
V OUT
330pF
A OUT
LTC3520
2.5V
200mA
4.7 μ F
169k
33pF
LTC3520
A IN
2.49M
806k
A IN
750k
402k
A IN
76.8k
3520 F05
Figure 3. Gain Block Con?gured as an LDO
3520 F02
Figure 2. Gain Block Used as a Comparator
3520fa
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3520EUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 1A Buck-Boost and 600mA Buck Converters |
| LTC3520IUF#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN 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 |
| LTC3520IUF#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN 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 |
| LTC3521 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters |
| LTC3521EFE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP 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 |
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