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| 型号： | MAX1706EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.4A 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 260kHz ~ 340kHz |
| 电流 - 输出： | 400mA |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
INPUT 0.9V TO 3.6V
L1 10 μ H (22 μ H)
C7
22 μ F
R5
LX
POUT
D1
BOOST OUTPUT 3.6V
LBP
OUT
R1
(TO PGND)
R6
C8
LBN
REF
TRACK
PGND
C9
0.33 μ F
C3
0.1 μ F 191k ?
C1*
C4
220 μ F
(100 μ F)
0.33 μ F
MAX1705
(TO PGND)
ONA
MAX1706
FB
R2
100k ?
LDO OUTPUT 3.3V
(TO OUT)
ONB
CLK/SEL
LBO
GND
LDO
FBLDO
R3
165k ?
C2*
C5*
0.33 μ F
C6
22 μ F
R4
NOTE : HEAVY LINES INDICATE HIGH-CURRENT PATH.
R7
100k ?
100k ?
*OPTIONAL.
( ) ARE FOR MAX1706.
Figure 2. Typical Operating Circuit (PFM Mode)
Step-Up Converter
Table 1. Selecting the Operating Mode
The step-up switching DC-DC converter generates an
adjustable output to supply both power circuitry (such
as RF power amplifiers) and the internal low-dropout
linear regulator. During the first part of each cycle, the
internal n-channel MOSFET switch is turned on. This
allows current to ramp up in the inductor and store
energy in a magnetic field. During the second part of
each cycle, when the MOSFET is turned off, the voltage
CLK/SEL
0
1
External Clock
(200kHz to 400kHz)
MODE
PFM
PWM
Synchronized
PWM
FEATURES
Low supply current
Low noise,
high output current
Low noise,
high output current
across the inductor reverses and forces current
through the diode and synchronous rectifier to the out-
put filter capacitor and load. As the energy stored in
the inductor is depleted, the current ramps down, and
the output diode and synchronous rectifier turn off.
Voltage across the load is regulated using either PWM
or PFM operation, depending on the CLK/SEL pin set-
ting (Table 1).
Low-Noise, High-Power PWM Operation
When CLK/SEL is pulled high, the MAX1705/MAX1706
operate in a high-power, low-noise PWM mode. During
PWM operation, they switch at a constant frequency
(300kHz), and modulate the MOSFET switch pulse
width to control the power transferred per cycle and
regulate the voltage across the load. In PWM mode, the
devices can output up to 850mA. Switching harmonics
generated by fixed-frequency operation are consistent
and easily filtered.
During PWM operation, each of the internal clock’s ris-
ing edges sets a flip-flop, which turns on the n-channel
MOSFET switch (Figure 3). The switch is turned off
when the sum of the voltage-error and current-
feedback signals trips a multi-input comparator and
resets the flip-flop; the switch remains off for the rest of
the cycle. When a change occurs in the output voltage
error signal into the comparator, it shifts the level that
the inductor current is allowed to ramp to during each
cycle and modulates the MOSFET switch pulse width.
A second comparator enforces a 1.55A (max) inductor-
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| MAX17073ETJ+ | 功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter 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 |
| MAX17073ETJ+T | 功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter 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 |
| MAX17075ETG+ | 功能描述:直流/直流开关转换器 Boost-Regulator w/Charge Pump 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 |
| MAX17075ETG+T | 功能描述:直流/直流开关转换器 Boost-Regulator w/Charge Pump 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 |
| MAX17075EVKIT+ | 功能描述:电源管理IC开发工具 MAX17075 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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