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参数资料
| 型号： | LTC3458EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.4A 12DFN |
| 标准包装： | 91 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 7.5 V |
| 输入电压： | 1.5 V ~ 6 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 1.4A |
| 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： | 12-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3458
PI FU CTIO S
SW (Pin 1): Switch Pin for Inductor Connection. During
discontinuous conduction mode an antiring resistor con-
nects SW to V IN to reduce noise.
V IN (Pin 2): Input Supply Pin. Connect this to the input
supply and decouple with 1 μ F minimum.
SYNC (Pin 3): Oscillator Synchronization Pin. A clock
pulse width of 100ns to 2 μ s is required to synchronize the
internal oscillator. This pin is disabled when grounded.
SHDN (Pin 4): Shutdown Pin. Grounding this pin shuts
down the IC. Connect to >1.25V to enable.
GND (Pin 9): Signal Ground Pin.
SS (Pin 10): Connect a capacitor between this pin and
ground to set soft-start period. 5 μ A of current is sourced
from SS during soft-start.
t(msec) = C SS ( μ F )? 200
BURST (Pin 11): Burst Mode Threshold Adjust Pin. A
resistor/capacitor combination from this pin to ground
programs the average load current at which automatic
Burst Mode operation is entered, according to the formula:
I LIM (Pin 5): Adjustable Peak Current Limit. Connect a
resistor from I LIM to GND to program the peak inductor
R BURST =
10
I BURST
I LIMIT =
C BURST =
f OSC =
V OUT = 1 . 23 ? 1 + ?
current according to the following formula:
200
R ILIM
where I LIMIT is in amps and R ILIM is in k Ω .
R T (Pin 6): Connect a resistor to ground to program the
oscillator frequency, according to the formula:
1
0 . 2 + 0 . 004 ? R T
where f OSC is in MHz and R T is in k Ω .
FB (Pin 7): Connect Resistor Divider Tap Here. The output
voltage can be adjusted from 2V to 7.5V. Feedback refer-
ence voltage is typically 1.23V.
where R BURST is in k Ω and I BURST is in amps.
C OUT ? V OUT
10 , 000
where C BURST(MIN) and C OUT are in μ F.
To force fixed frequency PWM mode, connect BURST to
V OUT through a 50k resistor.
V OUT (Pin 12): Output of the Synchronous Rectifier and
Internal Gate Drive Source for the Power Switches.
? R 2 ?
? R 1 ?
Exposed Pad (PGND) (Pin 13): Must be soldered to PCB
ground, for electrical contact and optimum thermal
performance.
COMP (Pin 8): g m Error Amp Output. A frequency com-
pensation network is connected from this pin to ground to
compensate the loop. See the section “Compensating the
Feedback Loop” for guidelines.
3458fa
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3458L | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3458LEDE | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:否 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3458LEDE#PBF | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3458LEDE#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3459 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2MHz Step-Up DC/DC Converter in SOT-23 |
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