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参数资料
| 型号： | MAX848ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV LN HP 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，RF 数据链路 |
| 输入电压： | 0.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 3.3V，2.7 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
1-Cell to 3-Cell, High-Power,
Low-Noise, Step-Up DC-DC Converters
OUT
MAX848/MAX849
2.25V
START-UP
OSCILLATOR
POUT
EN
Q
D
Q
PCH
0.25 ?
ON1
ON2
ON
RDY
EN
LX
REF
GND
CLK/SEL
1.25V
REF
EN
300kHz
OSCILLATOR
PFM/PWM
OSC
MODE
Q
NCH
0.13 ?
PGND
FB
FEEDBACK
AND
FEEDBACK
PFM/PWM
CONTROLLER
POK
POWER-GOOD
POKIN
AINSEL
SELECT
EN
N
AIN1
AIN2
Figure 1. Functional Diagram
ADC
DATA
_______________Detailed Description
The MAX848/MAX849 combine a switching regulator,
N-channel power MOSFET, P-channel synchronous
rectifier, precision reference voltage, power-good indi-
cator, and battery voltage monitor, all in a single mono-
lithic device. The MAX848/MAX849 are powered
directly from the output. The output voltage is factory
preset to 3.3V or adjustable from 2.7V to 5V with exter-
nal resistors (Dual Mode? operation). These devices
start from a low 1V input voltage and remain opera-
tional down to 0.7V. The MAX848/MAX849 operate with
standard application circuit for the MAX849 configured
in the high-power PWM mode.
On/Off Control
The MAX848/MAX849 are turned on or off by logic
input pins ON1 and ON2 (Table 1). When ON1 = 1 or
ON2 = 0, the part is on. When ON1 = 0 and ON2 = 1,
the part is off. Both inputs have logic trip points near
0.5 x V OUT with 0.15 x V OUT hysteresis.
Table 1. On/Off Logic Control
either one to three NiCd/NiMH cells or one Li-Ion cell.
At power-up, an internal low-voltage oscillator drives
the N-channel power switch, and the output voltage
slowly builds up. The oscillator has a 25% nominal duty
cycle to prevent current build-up in the inductor. An
output voltage in excess of the nominal 2.25V lockout
ON1
0
0
1
1
O N 2
0
1
0
1
MAX848/MAX849
On
Off
On
On
voltage activates the error comparator and internal tim-
ing circuitry. The device resumes operation in either
pulse-frequency-modulation (PFM) low-power mode or
pulse-width-modulation (PWM) low-noise mode, select-
ed by the logic control, CLK/SEL. Figure 2 shows the
Operating Modes
The MAX848/MAX849 operate in either PFM, PWM, or
PWM synchronized to an externally applied clock sig-
nal. Table 2 lists each operating mode.
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX849ESE | 功能描述:直流/直流开关转换器 1-3 Cell 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 |
| MAX849ESE+ | 功能描述:直流/直流开关转换器 1-3 Cell 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 |
| MAX849ESE+T | 功能描述:直流/直流开关转换器 1-3 Cell 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 |
| MAX849ESE-T | 功能描述:直流/直流开关转换器 1-3 Cell 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 |
| MAX849EVKIT | 功能描述:直流/直流开关转换器 1-Cell to 3-Cell High-Power Low-Noise 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 |
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