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| 型号： | MAX1703ESE |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V/ADJ 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，2.5 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 其它名称： | Q1159627 |
1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
Table 1. Typical Available Output Current
Table 2. Selecting the Operating Mode
INPUT
OUTPUT
OUTPUT
CLK/SEL
MODE
FEATURES
NO. OF CELLS
1 NiCd/NiMH
2 NiCd/NiMH
VOLTAGE
(V)
1.2
2.4
2.4
VOLTAGE
(V)
3.3
3.3
5.0
CURRENT
(mA)
600
1400
950
0
1
External Clock
(200kHz to 400kHz)
Low power
PWM
Synchronized
PWM
Low supply current
Low noise,
high output current
Low noise,
high output current
3 NiCd/NiMH
3.6
5.0
1600
Step-Up Converter
V BATT
The step-up switching DC-DC converter generates an
adjustable output from 2.5V to 5.5V. The internal N-
channel MOSFET switch is turned on during the first
L1
4.7 μ H
C1
100 μ F
part of each cycle, allowing 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 across the inductor reverses and
R5
10 ?
R3
CLK/SEL
LXP, LXN
POUT
MAX1703
ON
OUT
AIN
MBR0520L
D1
C5
0.22 μ F
C2
0.22 μ F
C4
2 x 220 μ F
forces current through the diode and synchronous rec-
tifier to the output filter capacitor and load. As the ener-
gy stored in the inductor is depleted, the current ramps
down and the output diode and synchronous rectifier
turn off. Depending on the CLK/SEL pin setting, voltage
across the load is regulated using either low-noise
PWM or low-power operation (Table 2).
Low-Noise PWM Operation
When CLK/SEL is pulled high, the MAX1703 operates
AO
in a high-power, low-noise PWM mode. During PWM
operation, the MAX1703 switches at a constant fre-
POKIN
POK
quency (300kHz), and modulates the MOSFET-switch
R4
C3
0.22 μ F
REF
PGND
GND
FB
pulse width to control the power transferred per cycle
and regulate the voltage across the load. In PWM mode
the device can output up to 1.5A. Switching harmonics
generated by fixed-frequency operation are consistent
SIGNAL GROUND
and easily filtered. See the Noise Spectrum plot in the
Typical Operating Characteristics.
NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS.
Figure 2. MAX1703 in High-Power PWM Mode
POWER GROUND
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 turns off when
the sum of the voltage-error, slope-compensation, and
current-feedback signals trips a multi-input comparator
Additional features include synchronous rectification for
high efficiency and improved battery life, and an
uncommitted comparator (POK) for monitoring the reg-
ulator’s output or battery voltage. The MAX1703 also
includes a gain block that can be used to build a linear
regulator using an external P-channel MOSFET pass
device; this gain block can also function as a second
comparator. A CLK input allows frequency synchro-
nization to reduce interference.
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, the comparator shifts the level to
which the inductor current ramps during each cycle. A
second comparator enforces an inductor current limit of
2.7A (typical).
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1703ESE+ | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters 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 |
| MAX1703ESE+T | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters 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 |
| MAX1703ESE-T | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters 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 |
| MAX1703EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1703 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 |
| MAX17040EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX17040G+ EVAL KIT - Boxed Product (Development Kits) |
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