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参数资料
| 型号： | LTC1928ES6-5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL SOT23-6 |
| 标准包装： | 500 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.7 V ~ 4.4 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 30mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
| 其它名称： | LTC1928ES6-5#PBF LTC1928ES6-5#PBF-ND |
LTC1928-5
APPLICATIO N S I N FOR M ATIO N
Power-On Reset
Upon initial power-up, a power-on reset circuit ensures
that the internal functions are correctly initialized. Once
V IN reaches about 1V, the power-on reset circuit will
enable the part as long as the CN/SHDN pin is not pulled
low.
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125 ° C). The
device dissipation P D = I OUT (2V IN – V OUT ) + V IN (2mA). The
device dissipates the majority of its heat through its pins,
especially GND (Pin 2). Thermal resistance to ambient can
be optimized by connecting GND to a large copper region
on the PCB, which serves as a heat sink. Applications that
operate the LTC1928-5 near maximum power levels should
maximize the copper area at all pins except CP and
CN/SHDN and ensure that there is some airflow over the
part to carry away excess heat.
BNC CABLES
General Layout Considerations
Due to the high switching frequency and high transient
currents produced by the device, careful board layout is a
must. A clean board layout using a ground plane and short
connections to all capacitors will improve noise perfor-
mance and ensure proper regulation.
Measuring Output Noise
Measuring the LTC1928 low noise levels requires care.
Figure 3 shows a test setup for taking the measurement.
Good connection and signal handling technique should
yield about 800 μ V P-P over a 2.5MHz bandwidth. The noise
measurement involves AC coupling the LTC1928 output
into the test setup’s input and terminating this connection
with 50 ? . Coaxial connections must be maintained to
preserve measurement integrity.
OR COUPLERS
COUPLING
CAPACITOR
PREAMP
BATTERY OR
LOW NOISE DC
POWER SUPPLY
LTC1928 V OUT
DEMO
BOARD
R LOAD
R*
1822
10 ×
BANDWIDTH
FILTER
INPUT
OSCILLOSCOPE
CONNECT BNC AND
R*
R LOAD GROUND TO THE
OUTPUT CAPACITOR
GROUND TERMINAL
PLACE COUPLING
CAPACITOR IN SHIELDED
BOX WITH COAXIAL
R*
*50 ? TERMINATIONS
PLACE BANDWIDTH FILTER
COMPONENTS IN SHIELDED BOX
WITH COAXIAL CONNECTORS
NOTE: KEEP BNC CONNECTIONS
CONNECTOR
HP-11048C OR
AS SHORT AS POSSIBLE
19285 F03
EQUIVALENT
Figure 3. LTC1928-5 Noise Measurement Test Setup
5V
V IN
3V
V RIPPLE < 800 μ V P-P
C OUT
4.7 μ F
C IN
4.7 μ F
3
2
1
LTC1928-5
V OUT CPO
GND CP
V IN CN/SHDN
4
5
6
C FLY
0.47 μ F
C CPO
4.7 μ F
IN
ADDITIONAL
LDO
OUT 3.3V
GND 10 μ F
19285 F04
Figure 4. LTC1928-5, External Load on CPO, No Shutdown State
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
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相关代理商/技术参数 |
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| LTC1929CG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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| LTC1929CG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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