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参数资料
| 型号： | LTC3530EMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.6A 10MSOP |
| 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 ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 600mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3530
OPERATION
The LTC3530 provides high ef?ciency, low noise power
for a wide variety of handheld electronic devices. The
LTC proprietary topology allows input voltages above,
below or equal to the output voltage by properly phasing
the output switches. The error amp output voltage on V C
determines the output duty cycle of the switches. Since
V C is a ?ltered signal, it provides rejection of frequencies
from well below the switching frequency. The low R DS(ON) ,
low gate charge synchronous switches provide high fre-
quency pulse width modulation control at high ef?ciency.
High ef?ciency is achieved at light loads when Burst Mode
operation is entered and the LTC3530’s quiescent current
drops to a low 40μA.
LOW NOISE FIXED FREQUENCY OPERATION
Oscillator
The frequency of operation is programmed by an external
resistor from R T to ground, according to the following
equation:
Internal Current Limit
There are two different current limit circuits in the LTC3530.
Each has internally ?xed thresholds which vary inversely
with V IN .
The ?rst circuit is a high speed peak current limit compara-
tor that will shut off switch A once the current exceeds
2.5A typical. The delay to output of this comparator is
typically 50ns.
A second ampli?er will source current out of FB to drop
the output voltage once the peak input current exceeds
2A typical. This method provides a closed loop means of
clamping the input current. During conditions where V OUT
is near ground, such as during a short-circuit or during
startup, this threshold is cut to 670mA (typ), providing a
foldback feature. For this current limit feature to be most
effective, the Thevenin resistance from FB to ground should
be greater than 100k Ω .
Reverse Current Limit
f (kHz)
=
33,170
R T(k )
During ?xed frequency operation, the LTC3530 operates
in forced continuous conduction mode. The reverse cur-
rent limit ampli?er monitors the inductor current from
the output through switch D. Once the negative inductor
Error Amp
The error ampli?er is a voltage mode ampli?er. The loop
compensation components are con?gured around the
ampli?er (from FB to V C ) to obtain stability of the converter.
For improved bandwidth, an additional R-C feed-forward
network can be placed across the upper feedback divider
resistor. The voltage on SHDN /SS clamps the error amp
output, V C , to provide a soft-start function.
current exceeds 640mA typical, the LTC3530 will shut off
switch D.
Four-Switch Control
Figure 1 shows a simpli?ed diagram of how the four in-
ternal switches are connected to the inductor, V IN , V OUT
and GND. Figure 2 shows the regions of operation for the
LTC3530 as a function of the internal control voltage, V CI .
85%
D MAX
BOOST
A ON, B OFF
PWM CD SWITCHES
BOOST REGION
V4 (≈1.5V)
V IN
7
PMOS A
SW1
SW2
V OUT
6
PMOS D
D MIN
BOOST
D MAX
BUCK
FOUR SWITCH PWM BUCK/BOOST REGION
D ON, C OFF
PWM AB SWITCHES BUCK REGION
V3 (≈1.15V)
V2 (≈1V)
3
4
0%
V1 (≈0.7V)
NMOS B
NMOS C
DUTY
CYCLE
3530 F02
INTERNAL
CONTROL
3530 F01
Figure 1. Simpli?ed Diagram of Output Switches
VOLTAGE, V CI
Figure 2. Switch Control vs Internal Control Voltage, V CI
3530fb
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3531 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3531-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3531-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3531EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA Buck-Boost Synchronous DC/DC Converters |
| LTC3531EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 8DFN 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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