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参数资料
| 型号： | MAX1858A |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| 中文描述： | 双路、180°异相工作的buck控制器，具有排序/预偏置启动和POR |
| 文件页数： | 8/22页 |
| 文件大小： | 553K |
| 代理商： | MAX1858A |
M
With dual, synchronized, out-of-phase operation, the
MAX1858A/MAX1875A/MAX1876As
’
high-side MOSFETs
turn on 180
°
out-of-phase. The instantaneous input cur-
rent peaks of both regulators no longer overlap, resulting
in reduced RMS ripple current and input voltage ripple.
This reduces the required input capacitor ripple-current
rating, allowing fewer or less expensive capacitors, and
reduces shielding requirements for EMI. The Out-of-
Phase Waveforms in the
Typical Operating Charac-
teristics
demonstrate synchronized 180
°
out-of-phase
operation.
Internal 5V Linear Regulator (V
L
)
All MAX1858A/MAX1875A/MAX1876A functions are
internally powered from an on-chip, low-dropout 5V
regulator. The maximum regulator input voltage (V+) is
23V. Bypass the regulator
’
s output (V
L
) with a 4.7μF
ceramic capacitor to PGND. The V
L
dropout voltage is
typically 500mV, so when V+ is greater than 5.5V, V
L
is
typically 5V. The MAX1858A/MAX1875A/MAX1876A
also employs an undervoltage lockout circuit that dis-
ables both regulators when V
L
falls below 4.2V. V
L
should also be bypassed to GND with a 0.1μF capaci-
tor. When V
L
falls and UVLO is tripped, the device is
latched and V
L
must be discharged below 2.5V before
normal operation can resume.
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
8
_______________________________________________________________________________________
V+
BST1
DH1
LX1
DL1
V
L
BST2
DH2
LX2
DL2
FB1
COMP1
*IRF7811W
**OPTIONAL
FB2
COMP2
PGND
REF
GND
OSC
SYNC
CKO
ILIM1
ILIM2
EN
OFF
ON
RESET OUTPUT
CLOCK OUTPUT
V
L
RST (MAX1858A/
MAX1876A ONLY)
MAX1858A
MAX1875A
MAX1876A
C
V+
0.22
μ
F
C
IN1
2
×
10
μ
F
C
OUT1
4
×
220
μ
F
N
H1*
N
L1*
L1
1.1
μ
H
OUTPUT1
V
OUT
= 1.8V
V
IN
6V - 23V
C
BST1
0.1
μ
F
R1A
8.06k
R1B
10k
10k
R
5.9k
C
COMP1A
0.01
μ
F
C
COMP1B
100pF
C
REF
0.22
μ
F
C
COMP2A
6800pF
C
COMP2B
100pF
R
8.2k
R2B
10k
96.5k
140k
R2A
15k
4.7
4.7
R
V+
4.7
N
L2*
**
**
N
H2*
L2
1.1
μ
H
CMPSH-3A
C
OUT2
4
220
μ
F
C
IN2
2
×
10
μ
F
OUTPUT2
V
OUT
= 2.5V
C
BST2
0.1
μ
F
C
VL
4.7
μ
F
0.1
μ
F
118k
D3
CMSSH-3
84.5k
D2
CMSSH-3
Figure 1. Standard 600kHz Application Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1875A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1876A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1858AEEG | Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX186CMJP | Low-Power, 8-Channel, Serial 12-Bit ADCs |
| MAX186ACAP | Low-Power, 8-Channel, Serial 12-Bit ADCs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1858AEEG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1858AEEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1858AEEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1858AEEG-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1858EEG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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