参数资料
型号: MAX1956ETI+T
厂商: Maxim Integrated Products
文件页数: 21/22页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 28-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
PWM 型: 电压模式
输出数: 2
频率 - 最大: 660kHz
占空比: 97%
电源电压: 1.6 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-WFQFN 裸露焊盘
包装: 带卷 (TR)
1.6V to 5.5V Input, 0.5% Accurate, Dual
180° Out-of-Phase Step-Down Controllers
Applications Information
PC Board Layout Guidelines
Careful PC board layout is important in any switching
regulator. The switching power stage requires particular
attention. Follow these guidelines for good PC board
layout:
TOP VIEW
Pin Configuration
1) Place decoupling capacitors as close as possible to
the IC pins.
2) Keep a separate power ground plane (connect to
the sources of the low-side MOSFETs, the input and
DL1
LX1
DH1
1
2
3
21
20
19
DL2
LX2
DH2
output capacitors, and PGND_ pins). Connect the
input decoupling capacitors across the drain of the
high-side MOSFETs and the source of the low-side
MOSFETs. The signal ground plane (connected to
the GND pin) is connected to the power ground
plane at a single point. Keep the high-current paths
as short as possible.
BST1
SYNC
EN
ILIM1
4
5
6
7
MAX1955
MAX1956
18
17
16
15
BST2
SEQ
AV DD
ILIM2
3) Connect the drains of the MOSFETs to a large land
area to help cooling the devices to further improve
efficiency and long-term reliability.
4) Ensure all feedback connections are short and
direct. Place the feedback resistors as close to the
IC as possible.
5) Route high-speed switching nodes (LX_) away from
sensitive analog areas (FB_, COMP_).
For a sample PC board layout, refer to the MAX1955
evaluation kit. Table 2 lists typical application circuit
components.
Table 2. Typical Application Circuit
Components
THIN QFN
Chip Information
TRANSISTOR COUNT: 8694
DESIGNATION
C10 – C13
C28, C29
D1 – D4
L1, L2
L3
N1, N2, N5, N6
N3, N4, N7, N8
QTY
4
2
4
2
1
4
4
DESCRIPTION
680μF, 2.5V POSCAPs
Sanyo 2R5TPD680M8
470μF, 6.3V POSCAPs
Sanyo 6TPB470M
Schottky diodes (SOT 323)
Central CMSSH-3
0.3μH, 35A inductors
Sumida CDEP125(U)-0R3
4.7μH inductor
TDK LDR655312T-4R7W
N-channel MOSFETs
Vishay Si7892DP
N-channel MOSFETs
Vishay Si4842DY
PROCESS: BiCMOS
______________________________________________________________________________________
21
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参数描述
MAX1957EUB 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1957EUB+ 功能描述:电流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1957EUB+T 功能描述:电流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX1957EUB-T 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX19586ETN 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32