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参数资料
| 型号： | LTC3878EGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 90% |
| 电源电压： | 4 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 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 ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3878
Wide V IN Range: 4V to 38V
Distributed Power Systems
Embedded Computing
FEATURES
n
n ±1% 0.8V Voltage Reference
n Extremely Fast Transient Response
n t ON(MIN) : 43ns
n No R SENSE ? Valley Current Mode Control
n Stable with Low ESR Ceramic C OUT
n Supports Smooth Start-Up Into Pre-Biased Output
n Optimized for High Step-Down Ratios
n Pin Compatible with the LTC1778 (No EXTV CC Pin)
n Power Good Output Voltage Monitor
n Dual N-Channel MOSFET Synchronous Drive
n Adjustable Switching Frequency
n Programmable Current Limit with Foldback
n Output Overvoltage Protection
n Small 16-Pin Narrow SSOP Package
APPLICATIONS
n
n
n Communications Infrastructure
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. No R SENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066.
TYPICAL APPLICATION
Fast, Wide Operating Range
No R SENSE Step-Down
DC/DC Controller
DESCRIPTION
The LTC ? 3878 is a synchronous step-down switching
DC/DC controller optimized for high switching frequency
and fast transient response. The constant on-time valley
current mode architecture allows for a wide input range,
including very low duty factor operation. No external sense
resistor or slope compensation is required. The LTC3878
is pin compatible with the LTC1778 in applications that do
not use EXTV CC while offering better efficiency. Consult
with the factory to verify compatibility.
Operating frequency is set by an external resistor and
compensated for variations in V IN to offer excellent line
stability. Discontinuous mode operation provides high
efficiency during light load conditions. A forced continu-
ous control pin allows the user to reduce noise and RF
interference. Safety features include output overvoltage
protection and programmable current limit with foldback.
Soft-start capability for supply sequencing is accomplished
through an external timing capacitor. The current limit is
user programmable.
The LTC3878 allows operation from 4V to 38V at the input
and from 0.8V to 90% V IN at the output. The LTC3878 is
available in a small 16-pin narrow SSOP package.
0.22μF
60
V IN = 12V
V OUT = 1.2V
0.1μF
12.1k
220pF
High Efficiency Step-Down Converter
432k
I ON
RUN/SS V IN
TG RJK0305
LTC3878
I TH SW 0.56μH
SGND BOOST
FCB
INTV CC
BG RJK0330
4.7μF
PGOOD PGND
V RNG 5.11k
V FB
10k
10μF
330μF
2
V IN
4.5V TO 28V
V OUT
1.2V
15A
Efficiency vs Load Current
100
90 DISCONTINUOUS
MODE
80
70
CONTINUOUS
MODE
50
40
30
20
10 SW FREQ = 400kHz
FIGURE 7 CIRCUIT
0
0.01 0.1 1 10 100
LOAD CURRENT (A)
3878 TA01a
3878 G07
3878fa
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3878IGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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) |
| LTC3878IGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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) |
| LTC3879EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP 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) |
| LTC3879EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP 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) |
| LTC3879EUD#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-QFN 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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