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| 型号： | MAX1771ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
MAX1771
12V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controller
Detailed Description
The MAX1771 is a BiCMOS, step-up, switch-mode
power-supply controller that provides a preset 12V out-
put, in addition to adjustable-output operation. Its
unique control scheme combines the advantages of
pulse-frequency modulation (low supply current) and
pulse-width modulation (high efficiency with heavy
loads), providing high efficiency over a wide output
current range, as well as increased output current
capability over previous PFM devices. In addition, the
external sense resistor and power transistor allow the
user to tailor the output current capability for each appli-
cation. Figure 1 shows the MAX1771 functional diagram.
The MAX1771 offers three main improvements over
prior pulse-skipping control solutions: 1) the converter
operates with miniature (5mm height and less than
9mm diameter) surface-mount inductors due to its
300kHz switching frequency; 2) the current-limited PFM
control scheme allows 90% efficiencies over a wide
REF
FB
range of load currents; and 3) the maximum supply
current is only 110μA.
The device has a shutdown mode that reduces the
supply current to 5μA max.
Bootstrapped/Non-Bootstrapped Modes
Figure 2 shows the standard application circuits for
bootstrapped and non-bootstrapped modes. In boot-
strapped mode, the IC is powered from the output
(V OUT , which is connected to V+) and the input voltage
range is 2V to V OUT . The voltage applied to the gate of
the external power transistor is switched from V OUT to
ground, providing more switch gate drive and thus
reducing the transistor’s on-resistance.
In non-bootstrapped mode, the IC is powered from the
input voltage (V+) and operates with minimum supply
current. In this mode, FB is the output voltage sense
point. Since the voltage swing applied to the gate of the
external power transistor is reduced (the gate swings
from V+ to ground), the power transistor’s on-resistance
DUAL-MODE
COMPARATOR
SHDN
50mV
MAX1771
BIAS
1.5V
REFERENCE
ERROR
CIRCUITRY
COMPARATOR
MIN OFF-TIME
ONE-SHOT
Q
TRIG
2.3 μ s
N
V+
F/F
S
R
Q
MAX ON-TIME
ONE-SHOT
TRIG Q
LOW-VOLTAGE
OSCILLATOR
2.5V
16 μ s
CURRENT-SENSE
AMPLIFIER
0.1V
EXT
CS
Figure 1. Functional Diagram
Maxim Integrated
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1771EVKIT-SO | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1771 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 |
| MAX1771MJA | 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 |
| MAX1771MPA/PR | 功能描述:DC/DC 开关控制器 12V or Adjustable High-Efficiency Low IQ Step-Up DC-DC Controller 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 |
| MAX1772EEI | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1772EEI+ | 功能描述:电池管理 Battery-Charger Building Block RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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