- 您现在的位置：买卖IC网 > PDF目录14492 > MAX711ESE+ (Maxim Integrated Products)IC REG BUCK BST ADJ 0.7A 16SOIC PDF资料下载
参数资料
| 型号： | MAX711ESE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 0.7A 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.7 V ~ 5.5 V |
| 输入电压： | 1.8 V ~ 11 V |
| 电流 - 输出： | 700mA |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
MAX710/MAX711
3.3V/5V or Adjustable,
Step-Up/Down DC-DC Converters
Configuration 3: High Efficiency, 11V, V BATT < 6.5V
In this configuration, N/ E is driven high by LBO when
V IN > 6.5V (Figure 2b). When V IN < V OUT , the IC
boosts, and the linear regulator operates as a switch,
with minimum forward drop. When V IN > V OUT , linear
regulation begins. When V IN > 6.5V (set by R5 and R6),
the linear regulator forces a minimum forward drop of
V FV (typically 0.5V at 5V V OUT ) as LBO drives N/ E high.
This transition is not seen at the output, since the linear
regulator already has an input-output voltage difference
of 6.5V - 5V. Efficiency with V IN slightly higher than
V OUT is equal to that of configuration 1, so configura-
tion 3 is most suitable when the battery voltage may be
near V OUT . This hookup has no functional shortcomings
compared with configuration 2, except that two addi-
tional resistors (R5 and R6) are needed.
IN
C1
R3
R4
ON
OFF
SHDN
STBY
N/E
LBO
LBI+
LBI-
MAX711
LX
PS
OUT
FB
L1
R1
R2
C4
C2
Configuration 4: Low Noise
With N/ E connected to PS, when the IC is boosting, the
linear regulator operates with V FV forward voltage (typi-
cally 0.5V at 5V V OUT ) for optimum noise rejection.
Linear regulation occurs when V IN > V OUT + V FV . The
V FV voltage differential results in boost efficiency typi-
cally 10% lower than with the high-efficiency configura-
tions.
ILIM
The current-limit-select input, ILIM, selects between the
two peak current limits: 1.5A (ILIM = GND) and 0.8A
(ILIM = PS). If the application requires 200mA or less
from the MAX710/MAX711, select 0.8A. The lower peak
current limit permits the use of smaller, low-cost induc-
tors. The ILIM input is internally diode clamped to GND
and PS, and should not be connected to signals out-
side this range.
Shutdown and Standby Modes
Grounding SHDN turns off the MAX710/MAX711 com-
pletely, disconnecting the input from the output. Tie
SHDN to PS for normal operation.
The MAX710/MAX711 have a standby mode that shuts
down the step-up converter. The linear regulator
remains on with a 7μA (typ) LDO quiescent current.
Connect STBY to ground to enter standby mode; other-
wise, connect STBY to PS.
__________________Design Procedure
Output Voltage Selection
For the MAX710, you can obtain a 3.3V or 5V output
voltage by tying 3/ 5 to GND or PS. Efficiency is typically
85% over a 2mA to 250mA load range. The device is
bootstrapped, with power derived from the step-up
voltage output (at PS). Under all load conditions, the
Maxim Integrated
REF
PGND GND ILIM
Figure 3. MAX711 Adjustable Output Voltage
MAX710/MAX711 typically start up with a 1V input. If
the battery voltage exceeds the programmed output
voltage, the output will linear regulate down to the
selected output voltage.
The MAX711’s adjustable output voltage is set by two
resistors, R1 and R2 (Figure 3), which form a voltage
divider between the output and FB. Use the following
equation to determine the resistor values:
R1 = R2 [(V OUT / V REF ) - 1]
where V REF = 1.25V.
Since the input bias current at FB has a maximum value
of 50nA, R1 and R2 can be large with no significant
accuracy loss. Choose R2 in the 100k ? to 1M ? range
and calculate R1 using the formula above. For 1%
error, the current through R1 should be at least 100
times FB’s bias current.
Low-Battery Comparator
The MAX710/MAX711 contain a comparator for low-
battery detection. If the voltage at LBI+ falls below that
at LBI- (typically connected to REF), LBO goes low.
Hysteresis is typically 50mV. Set the low-battery moni-
tor’s threshold with two resistors, R3 and R4 (Figure 2),
using the following equation:
R3 = R4 [(V LBT / V LBI -) - 1]
9
相关PDF资料 |
PDF描述 |
|---|---|
| VE-B1D-EX-F3 | CONVERTER MOD DC/DC 85V 75W |
| VE-JWT-EX-B1 | CONVERTER MOD DC/DC 6.5V 75W |
| GCM30DCTI-S288 | CONN EDGECARD 60POS .156 EXTEND |
| RBM24DTBT-S189 | CONN EDGECARD 48POS R/A .156 SLD |
| VE-JWR-EX-B1 | CONVERTER MOD DC/DC 7.5V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX711ESE+ | 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down 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 |
| MAX711ESE+T | 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down 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 |
| MAX711ESE-T | 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down 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 |
| MAX712 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX712_02 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
发布紧急采购，3分钟左右您将得到回复。