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参数资料
| 型号： | LTC3425EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 5A 32QFN |
| 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： | 2.4 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 5A |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
LTC3425
OPERATIO
DETAILED DESCRIPTION
The LTC3425 provides high efficiency, low noise power
for high current boost applications such as cellular phones
5
4
SINGLE
PHASE
and PDAs. 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 compensation provides ease of loop compensation
with excellent transient load response. The low R DS(ON) ,
low gate charge synchronous switches eliminate the need
3
2
1
FOUR PHASE
for an external Schottky rectifier, and provide efficient high
0
0
0.5
1
1.5
frequency 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 12 μ A typical on V OUT .
MULTIPHASE OPERATION
The LTC3425 uses a 4-phase architecture, rather than the
conventional single phase of other boost converters. By
having multiple phases equally spaced (90 ° apart), not
only is the output ripple frequency increased by a factor of
four, but the output capacitor ripple current is greatly
reduced. Although this architecture requires four induc-
tors, rather than a single inductor, there are a number of
TIME ( μ s)
3425 F01
Figure 1. Comparison of Output Ripple Current with Single
Phase and 4-Phase Boost Converter in a 2A Load Application
Operating at 50% Duty Cycle
Example:
The following example, operating at 50% duty cycle,
illustrates the advantages of multiphase operation over a
conventional single-phase design.
V IN = 1.9V, V OUT = 3.6V, Efficiency = 90% (approx),
I OUT = 2A, Frequency = 1MHz, L = 2.2 μ H
Table 1
important advantages.
? Much lower peak inductor current allows the use of
PARAMETER
Peak-Peak Output
SINGLE
PHASE
4.227A
FOUR
PHASE
0.450A
CHANGE FROM
1 TO 4 PHASE
Reduced by 89%
smaller, lower cost inductors.
Ripple Current
? Greatly reduced output ripple current minimizes output
capacitance requirement.
RMS Output Ripple Current
Peak Inductor Current
Output Ripple Frequency
2.00A
4.227A
1MHz
0.184A
1.227A
4MHz
Reduced by 91%
Reduced by 71%
Increased by 4 ×
? Higher frequency output ripple is easier to filter for low
noise applications.
? Input ripple current is also reduced for lower noise on
V IN .
The peak boost inductor current is given by:
With 4-phase operation, at least one of the phases will be
delivering current to the load whenever V IN is greater than
one quarter V OUT (duty cycles less than 75%). For lower
duty cycles, there can be as many as two or three phases
delivering load current simultaneously. This greatly re-
I LPEAK =
I O
( 1 – D ) ? N
+
di
2
duces both the output ripple current and the peak current
in each inductor, compared with a single-phase converter.
This is illustrated in the waveforms of Figures 2 and 3.
Where I O is the average load current, D is the PWM duty
cycle, N is the number of phases and di is the inductor
ripple current. This relationship is shown graphically in
Figure 1 using a single phase and a 4-phase example.
Operation Using Only Two or Three Phases
The LTC3425 can operate as a 2- or 3-phase converter by
simply eliminating the inductor from the unused phase(s).
3425f
11
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| LTC3426ES6#TRMPBF | 功能描述:IC REG BOOST ADJ 2A TSOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色产品:BD91x Series Step-Down Regulators 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:2 输出电压:3.3V，0.8 V ~ 2.5 V 输入电压:4.5 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:1MHz 电流 - 输出:1.5A 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:20-VFQFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:VQFN020V4040 产品目录页面:1373 (CN2011-ZH PDF) 其它名称:BD9152MUV-E2TR |
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