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参数资料
| 型号： | MAX1705C |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| 中文描述： | 1 - 3节电池，大电流，低噪声，升压型DC - DC转换器与线性稳压器 |
| 文件页数： | 10/20页 |
| 文件大小： | 215K |
| 代理商： | MAX1705C |
M
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
10
______________________________________________________________________________________
_______________Detailed Desc ription
The MAX1705/MAX1706 are designed to supply both
power and low-noise circuitry in portable RF and data-
acquisition instruments. They combine a linear regula-
tor, step-up switching regulator, N-channel power
MOSFET, P-channel synchronous rectifier, precision
reference, and low-battery comparator in a single 16-
pin QSOP package (Figure 1). The switching DC-DC
converter boosts a 1- or 2-cell input to an adjustable
output between 2.5V and 5.5V. The internal low-dropout
regulator provides linear post-regulation for noise-
sensitive circuitry, as well as outputs from 1.25V to
300mV below the switching-regulator output. The
MAX1705/MAX1706 start from a low, 1.1V input and
remain operational down to 0.7V.
These devices are optimized for use in cellular phones
and other applications requiring low noise during full-
power operation, as well as low quiescent current for
maximum battery life during standby and shutdown.
They feature constant-frequency (300kHz), low-noise
pulse-width-modulation (PWM) operation with 300mA or
730mA output capability from one or two cells, respec-
tively, with 3.3V output. A low-quiescent-current stand-
by pulse-frequency-modulation (PFM) mode offers an
output up to 60mA and 140μA, respectively, and
reduces quiescent power consumption to 500μW. In
shutdown mode, the quiescent current is further
reduced to just 1μA. Figure 2 shows the standard appli-
cation circuit for the MAX1705 configured in high-
power PWM mode.
Additional features include synchronous rectification for
high efficiency and improved battery life, and an
uncommitted comparator for low-battery detection. A
CLK/SEL input allows frequency synchronization to
reduce interference. Dual shutdown controls allow shut-
down using a momentary pushbutton switch and micro-
processor control.
LBP
FBLDO
OUT
2.15V
ONA
ON
ONB
REF
GND
CLK/SEL
FB
LDO
POUT
LX
PGND
LBO
LBN
REF
SHUTDOWN
LOGIC
THERMAL
SENSOR
MAX1705
MAX1706
ERROR
AMP
START-UP
OSCILLATOR
EN
Q
P
P
N
MOSFET DRIVER
WITH CURRENT
LIMITING
EN
300kHz
OSCILLATOR
EN
D
OSC
MODE
PFM/PWM
Q
Q
IFB
PFM/PWM
CONTROLLER
N
RDY
1.250V
REFERENCE
TRACK
IC PWR
IREF
V
OUT
- 300mV
V
LDO
ICS
OUT
Figure 1. Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1705D | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1705EEE | 18-Bit Universal Bus Transceivers With 3-State Outputs 56-SSOP -40 to 85 |
| MAX1706 | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1706EEE | 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator |
| MAX1708 | High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1705EEE | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE+ | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE+T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705EEE-T | 功能描述:直流/直流开关转换器 1-3 Cell Step-Up w/Linear Regulator 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 |
| MAX1705ESE+ | 制造商:Maxim Integrated Products 功能描述:1 TO 3-CELL HIGH-CURRENT LOW-NOIS - Rail/Tube |
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