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参数资料
| 型号： | MAX1776EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V/ADJ 0.6A 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1.25 V ~ 24 V |
| 输入电压： | 4.5 V ~ 24 V |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
FB
GND
ILIM
LX
IN
ILIM2
SHDN
OUT
FUNCTION
Dual-Mode Feedback Input. Connect to GND for the preset 5V output. Connect to a resistive divider
between OUT and GND to adjust the output voltage between 1.25V and V IN .
Ground
Peak Current Control Input. Connect to IN or GND to set peak current limit. ILIM and ILIM2 together set
the peak current limit. See Setting Current Limit .
Inductor Connection. Connect LX to external inductor and diode as shown in Figure 1.
Input Supply Voltage. Input voltage range is 4.5V to 24V.
Peak Current Control Input 2. Connect to IN or GND. ILIM and ILIM2 together set the peak current limit.
See Setting Current Limit .
Shutdown Input. A logic low shuts down the MAX1776 and reduces the supply current to 3 μ A. LX is high
impedance in shutdown. Connect to IN for normal operation.
Regulated Output Voltage High-Impedance Sense Input. Internally connected to a resistive divider.
Do not connect for output voltages higher than 5.5V. Connect to GND when not used.
Detailed Description
The MAX1776 step-down converter is designed primar-
ily for battery-powered devices and notebook comput-
ers. The unique current-limited control scheme
provides high efficiency over a wide load range.
Operation up to 100% duty cycle allows the lowest pos-
sible dropout voltage, increasing the usable supply
voltage range. Under no load, the MAX1776 draws only
15μA, and in shutdown mode, it draws only 3μA to fur-
ther reduce power consumption and extend battery life.
Additionally, an internal 24V switching MOSFET, inter-
nal current sensing, and a high switching frequency
minimize PC board space and component costs.
Current-Limited Control Architecture
The MAX1776 uses a proprietary current-limited control
scheme with operation to 100% duty cycle. This DC-DC
converter pulses as needed to maintain regulation,
resulting in a variable switching frequency that increas-
es with the load. This eliminates the high supply cur-
rents associated with conventional constant-frequency
pulse-width-modulation (PWM) controllers that switch
the MOSFET unnecessarily.
When the output voltage is too low, the error comparator
sets a flip-flop, which turns on the internal P-channel
MOSFET and begins a switching cycle (Figure 2). As
shown in Figure 3, the inductor current ramps up linear-
ly, storing energy in a magnetic field while charging the
output capacitor and servicing the load. The MOSFET
turns off when the peak current limit is reached, or when
INPUT
4.5V TO 24V
IN
LX
L1
OUTPUT
5V
the maximum on-time of 10μs is exceeded and the out-
put voltage is in regulation. If the output is out of regula-
C IN
J1
J2
J3
J4
SHDN
ILIM
ILIM2
MAX1776
OUT
D1
C OUT
tion and the peak current is never obtained, the
MOSFET remains on, allowing a duty cycle up to 100%.
This feature ensures the lowest possible dropout volt-
age. Once the MOSFET turns off, the flip-flop resets, the
inductor current is pulled through D1, and the current
GND
C IN : 10 μ F, 25V CERAMIC
FB
NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
through the inductor ramps back down, transferring the
stored energy to the output capacitor and load. The
MOSFET remains off until the 0.42μs minimum off-time
expires, and the output voltage drops out of regulation.
SEE TABLE 3 FOR OTHER COMPONENT VALUES
Figure 1. Typical Application Circuit
8
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| MAX1776EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1776 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1777EEI | 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 |
| MAX1777EEI+ | 功能描述:DC/DC 开关控制器 Quad-Out Main Power Sply Ctlr for Ntbk 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 |
| MAX1777EEI+T | 功能描述:DC/DC 开关控制器 Quad-Out Main Power Sply Ctlr for Ntbk 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 |
| MAX1777EEI-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 |
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