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参数资料
| 型号： | MAX8553EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BUCK PWM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，DDR，DDR2 |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
4.5V to 28V Input, Synchronous PWM Buck Controllers
for DDR Termination and Point-of-Load Applications
VL
R1
20k ?
POK
C3
POK
V+
FSEL
VL
BST
D1
CMPSH-3
4.7 μ F
6.3V
17V TO 21V
VIN
OFF
ON
C7
0.22 μ F
10V
EN
HSD
REF
MAX8554
DH
LX
C4
0.47 μ F
10V
Q1
IRF7807V
L1
2.5 μ H
10A
C2
470 μ F
16V
1.8V AT
8A
C1
10 μ F
16V
VOUT
R4
61.9k ?
ILIM
DL
PGND
Q2
IRF7821
R6
3 ?
C8
2200pF
R2
12.1k ?
R3
C6
2x470 μ F
4V
C5
10 μ F
6.3V
R5
80.6k ?
GND
OUT
FB
6.04k ?
PGND
Figure 3. Typical Application Circuit 3: 19V Input, 1.8V Output at Up to 8A with 300kHz Switching Frequency
Detailed Description
Internal Linear Regulator
An internal regulator produces the +5V supply (VL) that
powers the PWM controller, MOSFET driver, logic, refer-
ence, and other blocks within the IC. This +5V low-
the 455kHz IF band. Also, with a constant switching fre-
quency, the inductor ripple-current operating point
remains relatively constant, resulting in easy design
methodology and predictable output voltage ripple.
The general formula for the MAX8553 on-time (t ON ) is:
dropout (LDO) linear regulator supplies up to 35mA for
MOSFET gate-drive and external loads. For supply volt-
ages between +4.5V and +5.5V, connect VL to V+. This
t ON = K × N ×
1
V EN / HSD
× V OUT
bypasses the VL regulator, which improves efficiency
and allows the IC to function at lower input voltages.
On-Time One-Shot and
Switching Frequency
The heart of the PWM is the one-shot that sets the high-
side switch on-time. This fast, low-jitter, adjustable one-
where V EN/HSD and V OUT are the voltages measured at
EN/HSD and the output, respectively, and K = 1.7μs.
The value of N depends on the configuration of FSEL
and is listed in Table 1.
For the MAX8554, the general formula for on-time (t ON ) is:
shot includes circuitry that varies the on-time in
response to both input and output voltages. The high-
side switch on-time is inversely proportional to the input
t ON = K × N ×
1
V HSD
× V OUT
voltage as measured by the EN/HSD (HSD for the
MAX8554) input, and is directly proportional to the out-
put voltage. This algorithm results in a nearly constant
switching frequency despite the lack of a fixed-fre-
quency clock generator. The switching frequency can
be selected to avoid noise-sensitive regions such as
where V HSD and V OUT are the voltages measured at
HSD and the output, respectively, and K = 1.7μs. The
value of N depends on the configuration of FSEL and is
listed in Table 2.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8554EEE | 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 |
| MAX8554EEE+ | 功能描述:电流型 PWM 控制器 4.5-28V Input Synch 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 |
| MAX8554EEE+T | 功能描述:电流型 PWM 控制器 4.5-28V Input Synch 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 |
| MAX8554EEE-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 |
| MAX8554EVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX8553 MAX8554 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 |
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