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LT3154AVPBF 数据表(PDF) 11 Page - Analog Devices

部件名 LT3154AVPBF
功能描述  6A Low Noise, High Performance Buck-Boost DC/DC Converter
PDF  32 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

LT3154AVPBF 数据表(HTML) 11 Page - Analog Devices

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LT3154
11
Rev. 0
For more information www.analog.com
QUICK REFERENCE
Thissectionofthedatasheetcontainsequationsforexternal
component selection for the LT3154 where applicable.
VIN UVLO Threshold
The VIN threshold is internally set to a typical value of
1.7V for turn‑on and 1.6V for turn‑off when EN/UVLO
is connected to VIN. The VIN UVLO can be adjusted to a
higher threshold voltage with a resistor network on EN/
UVLO according to the following equations:
V(TURNON) =1.2V 1+
R1
R2
⎛
⎝
⎜
⎞
⎠
⎟
V(TURNOFF) =1.1V 1+
R1
R2
⎛
⎝⎜
⎞
⎠⎟
EN/UVLO
LT3154
R1
R2
VIN
3154 QR01
Output Voltage Programming
The output voltage for the LT3154 is set via a resistor
divider connected at the FB pin:
VOUT = 0.99V 1+
R3
R4
⎛
⎝⎜
⎞
⎠⎟
FB
LT3154
R3
R4
VOUT
3154 QR02
Inmostapplications,choosingR4equalto1Megrepresents
agoodtrade‑offbetweenquiescentcurrentandrobustness
against PCB leakage. The minimum recommended VOUT
setting is 1.8V, the maximum is 5.5V.
Switching Frequency
The buck‑boost converter switching frequency, fSW, is
set by the value of the RT resistor connected between the
RT pin and ground according to the following equation.
Connecting the RT pin to VIN will set a default frequency
of 2.2MHz.
fSW(MHz)=
110
RT
(kΩ)
RT
RT
PROGRAMMABLE
FREQUENCY
DEFAULT 2.2MHz
FREQUENCY
VIN
VIN
RT
3154 QR04
Table 1. RT Value for Common Switching Frequencies
fSW
RT
400kHz
274kΩ
500kHz
221kΩ
750kHz
147kΩ
1.0MHz
110kΩ
2.0MHz
54.9kΩ
2.2MHz
Connect to VIN
3.0MHz
36.5kΩ
4.0MHz
27.4kΩ



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