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参数资料
| 型号： | LTC3458EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.4A 12DFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3458
BLOCK DIAGRA
V CC
BURST
11
SW
1
V CC
2
SYNC
3
OSC/SYNC
SLOPE
ANTIRING
R T
6
MAX
DUTY
UNDER
BURST MODE
CONTROL
N-DRIVE
P-DRIVE
V SELECT
–
+
I ZERO
MODE
I ZERO
V BEST
SW1
DETECT
PWM
AND
BURST MODE
P-DRIVE
N-DRIVE
P-DRIVE
12 V OUT
DRIVE LOGIC
UNDER
4%
UNDERVOLTAGE
SLEEP
MODE
SLEEP
CONTROL
SLEEP TO
ALL BLOCKS
PGND
BURST ACTIVE
ERROR AMPLIFIER/
BURST COMPARATOR
–
7 FB
FIXED
FREQUENCY
BURST MODE
MUX
I COMP/LIMIT_PEAK
I BURST_PEAK
SLOPE
PEAK CURRENT
COMPARATOR
I COMP , I LIMIT ,
I BURST_PEAK ,
SLOPE COMP
I_SENSE
(DISABLED IN
BURST MODE)
+
MODE
TSD
BIAS
CURRENTS
UVLO
V CC
REFERENCE/
BIAS
V BEST
N-DRIVE
SOFT-START
THERMAL SD
SD
SDB
TO ALL BLOCKS
PGND
9
GND
5
I LIM
13
PGND
10
SS
8
COMP
4
SHDN
3458 BD
APPLICATIO S I FOR ATIO
Detailed Description
The LTC3458 provides high efficiency, low noise power
for boost applications with output voltages up to 7.5V. The
true output disconnect feature eliminates inrush current,
and allows V OUT to go to zero during shutdown. The
current mode architecture with adaptive slope compensa-
tion provides ease of loop compensation with excellent
transient load response. The low R DS(ON) , low gate charge
synchronous switches eliminate the need for an external
Schottky rectifier, and provide efficient high frequency
LTC3458 Programmable Functions
Current Limit/Peak Burst Current. The programmable
current limit circuit sets the maximum peak current in the
internal N-channel MOSFET switch. This clamp level is
programmed using a resistor to ground on I LIM . In Burst
Mode operation, the current limit is automatically set to
~1/4 of the programmed current limit for optimal effi-
ciency. A 124k R ILIM resistor is recommended in most
applications unless a lower limit is needed to prevent the
external inductor from saturating.
pulse width modulation (PWM) control. High efficiency is
achieved at light loads when Burst Mode operation is
entered, where the IC’s quiescent current is a low 15 μ A
I LIM =
200
R
typical on V IN . The LTC3458 is designed to provide custom
performance in a variety of applications with program-
I is in amps and R is in k Ω .
mable feedback, current limit, oscillator frequency, soft-
start, and Burst Mode threshold.
I BURSTPEAK ≈
1
4
? I LIM
3458fa
8
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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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