参数资料
型号: LTM4601AIY#PBF
厂商: Linear Technology
文件页数: 13/30页
文件大小: 0K
描述: IC DC/DC UMODULE 12A 133-BGA
标准包装: 119
系列: µModule®
类型: 非隔离(POL)
输出数: 1
电压 - 输入(最小): 4.5V
电压 - 输入(最大): 20V
Voltage - Output 1: 0.6 ~ 5 V
电流 - 输出(最大): 12A
特点: 带有 UVLO
安装类型: 表面贴装
封装/外壳: 133-BGA
尺寸/尺寸: 0.59" L x 0.59" W x 0.13" H(15.0mm x 15.0mm x 3.4mm)
包装: 托盘
工作温度: -40°C ~ 85°C
效率: 95%
配用: DC1041A-A-ND - BOARD EVAL LTM4601
LTM4601/LTM4601-1
APPLICATIONS INFORMATION
V OUT TO f SET
Multiphase operation with multiple LTM4601 devices in
parallel will lower the effective output ripple current due to
the interleaving operation of the regulators. For example,
each LTM4601’s inductor current in a 12V to 2.5V multi-
phase design can be read from the Inductor Ripple Current
vs Duty Cycle graph (Figure 3). The large ripple current
12
2.5V OUTPUT
10 5V OUTPUT
1.8V OUTPUT
8 1.5V OUTPUT
1.2V OUTPUT
6 3.3V OUTPUT WITH
130k ADDED FROM
4
5V OUTPUT WITH
100k ADDED FROM
2 f SET TO GND
at low duty cycle and high output voltage can be reduced
by adding an external resistor from f SET to ground which
increases the frequency. If the duty cycle is DC = 2.5V/12V
= 0.21, the inductor ripple current for 2.5V output at 21%
duty cycle is ~6A in Figure 3.
Figure 4 provides a ratio of peak-to-peak output ripple cur-
rent to the inductor current as a function of duty cycle and
the number of paralleled phases. Pick the corresponding
duty cycle and the number of phases to arrive at the correct
output ripple current ratio value. If a 2-phase operation is
chosen at a duty cycle of 21%, then 0.6 is the ratio. This
0.6 ratio of output ripple current to inductor ripple of 6A
equals 3.6A of effective output ripple current. Refer to
Application Note 77 for a detailed explanation of output
ripple current reduction as a function of paralleled phases.
0
0
0.2 0.4 0.6
DUTY CYCLE (V OUT /V IN )
0.8
4601 F03
The output ripple voltage has two components that are
related to the amount of bulk capacitance and effective
series resistance (ESR) of the output bulk capacitance.
Figure 3. Inductor Ripple Current vs Duty Cycle
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
1-PHASE
2-PHASE
3-PHASE
4-PHASE
6-PHASE
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
DUTY CYCLE (V O /V IN )
4601 F04
Figure 4. Normalized Output Ripple Current vs Duty Cycle, Dlr = V O T/L I , Dlr = Each Phase’s Inductor Current
For more information www.linear.com/LTM4601
4601fd
13
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