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| 型号： | MAX1705EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.85A 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： | 850mA |
| 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
LBP is less than 50nA, R6 can be a large value (such
as 270k ? or less) without sacrificing accuracy.
Connect the resistor voltage-divider as close to the IC
as possible, within 0.2in. (5mm) of the LBP pin. The
inputs have a 0.5V to 1.5V common-mode input range,
and a 16mV input-referred hysteresis.
The low-battery comparator can also be used to moni-
tor the output voltage, as shown in Figure 5.
POUT
MAX1705
MAX1706
LBO
LBN
LDO
LBP
R5
To set the low-battery threshold to a voltage below the
1.25V reference, insert a resistor-divider between REF
and LBN, and connect the battery to the LBP input
through a 10k ? current-limiting resistor (Figure 6). The
equation for setting the resistors for the low-battery
0.33 μ F
REF
GND
R6
threshold is then as follows:
Figure 5. Using the Low-Battery Comparator to Sense
R 5 = R 6 ? REF
- 1 ?
? V
? V IN , TH
?
?
the Output Voltage
Alternatively, the low-battery comparator can be used
to check the output voltage or to control the load direct-
ly on POUT during startup (Figure 7). Use the following
POUT
REF
equation to set the resistor values:
MAX1705
MAX1706
R5
0.33 μ F
R 5 = R 6 ?
- 1 ?
? V OUT,TH
? V LBP
?
?
R8
10k ?
LBO
LBP
LBN
R6
where V OUT,TH is the desired output voltage trip point
and V LBP is connected to the reference or 1.25V.
Reference
BATTERY
VOLTAGE
GND
The MAX1705/MAX1706 have an internal 1.250V, 1%
bandgap reference. Connect a 0.33μF bypass capaci-
tor to GND within 0.2in. (5mm) of the REF pin. REF can
source up to 50μA of external load current.
Figure 6. Detecting Battery Voltages Below 1.25V
_________________ Design Procedure
P
STEP-UP OUTPUT
Setting the Output Voltages
Set the step-up converter output voltage between 2.5V
C5
270k ?
C3
0.1 μ F
OUT
POUT
R5
and 5.5V by connecting a resistor voltage-divider to FB
from OUT to GND, as shown in Figure 8. The resistor
values are then as follows:
C4
MAX1705
LBO MAX1706
LBP
LBN
R6
R 1 = R 2 ? POUT - 1 ?
? V ?
? V FB ?
0.33 μ F
REF
GND
where V FB , the step-up regulator feedback setpoint, is
1.233V. Since the input bias current into FB is less than
50nA, R2 can have a large value (such as 270k ? or
Figure 7. Using the Low-Battery Comparator for Load Control
During Startup
14
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