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| 型号： | MAX8556EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX8556 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 1.2V |
| 电流 - 输出： | 4A |
| 输入电压： | 1.43 ~ 3.6V |
| 稳压器类型： | 正，可调式 |
| 工作温度： | 0°C ~ 70°C |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX8556 |
4A Ultra-Low-Input-Voltage
LDO Regulators
Applications Information
Output Voltage Selection
The MAX8556/MAX8557 feature an adjustable output
voltage from 0.5V to 3.4V. Set the output voltage using
V IN
1.425V TO 3.6V
1–6
IN
OUT
7–11
V OUT
1.2V AT 4A
R 2 = R 3 x ? OUT ? 1 ?
an external resistor-divider from the output to GND with
FB connected to the center tap as shown in Figures 1
and 2. Choose R3 ≤ 1k ? for light-load stability.
Determine R2 using the following equation:
? V ?
? V FB ?
C1
2 x 10 μ F
POK
SHUTDOWN
R1
100k ?
ENABLED
12
18
POK
EN
U1
MAX8556
FB
GND
13
14
R2
1.4k ?
R3
1k ?
C2
2 x 10 μ F
where V OUT is the desired output voltage and V FB is 0.5V.
Capacitor Selection and
Regulator Stability
Capacitors are required at the MAX8556/MAX8557
inputs and outputs for stable operation over the full
temperature range and with load currents up to 4A.
Connect 2 x 10μF capacitors between IN and GND and
2 x 10μF low equivalent-series-resistance (ESR) capac-
N.C.
15
Figure 1. MAX8556 Typical Application Circuit
1–6
itors between OUT and GND. The input capacitor (C IN )
lowers the source impedance of the input supply. If the
MAX8556/MAX8557s’ input is close to the output of the
source supply, a smaller input capacitance can be
used. Otherwise, 2 x 10μF ceramic input capacitors are
recommended. The output capacitor ’s (C OUT ) ESR
affects output noise and may affect output stability. Use
output capacitors with an ESR of 0.05 ? or less to
ensure stability and optimum transient dropout. For
good output transient performance, use the following
formula to select a minimum output capacitance:
V IN
1.7V TO 3.6V
C1
2 x 10 μ F R1
100k ?
POR
ENABLED
SHUTDOWN
12
18
IN
POR
EN
U2
MAX8557
N.C.
OUT
FB
GND
7–11
13
14
R2
2k ?
R3
1k ?
V OUT
1.5V AT 4A
C2
2 x 10 μ F
C OUT = I OUT(MAX) x 1μF/200mA
Noise, PSRR, and Transient Response
The MAX8556/MAX8557 are designed to operate with
low-dropout voltages and low quiescent currents while
still maintaining low noise, good transient response,
and high AC rejection (see the Typical Operating
Characteristics for a plot of Power-Supply Rejection
Ratio (PSRR) vs. Frequency). When operating from
noisy sources, improved supply-noise rejection and
transient response can be achieved by increasing the
values of the input and output bypass capacitors and
through passive filtering techniques. The MAX8556/
MAX8557 load-transient response graphs (see the
15
Figure 2. MAX8557 Typical Application Circuit
Typical Operating Characteristics) show two compo-
nents of the output response: a DC shift from the output
impedance due to the load current change, and the
transient response. A typical transient overshoot for a
step change in the load current from 40mA to 4A is
40mV. Use an output capacitance from 20μF to 120μF
to attenuate the overshoot.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8557ETE | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8557ETE+ | 功能描述:低压差稳压器 - LDO 4A Ultra-Low-Input-V LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8557ETE+T | 功能描述:低压差稳压器 - LDO 4A Ultra-Low-Input-V LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8557ETE-T | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8559EBA11+T | 功能描述:低压差稳压器 - LDO Dual 300mA Low-Noise Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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