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| 型号： | MAX1677EEE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 0.35A DL 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： | 两者兼有 |
| 输出数： | 2 |
| 输出电压： | 3.3V 或可调主电源，-28 V ~ 28 V 或可调副电源 |
| 输入电压： | 0.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 350mA |
| 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-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
Table 3. Setting LCD Output Polarity and
Peak Inductor Current
high, the series combination of R8 and R7 source cur-
rent into the summing node at LBI (no current flows into
the IC).
LCD
OUTPUT
POLARITY
Positive
Negative
Positive
Negative
LCDPOL
CONNECTED TO:
OUT
GND
OUT through 50k ?
GND through 50k ?
L CDLX PEAK
INDUCTOR CURRENT
(mA)
350
350
225
225
Design Procedure
The MBC feedback pin (FB) features Dual Mode opera-
tion. With FB grounded, the MBC output is preset to
3.3V. It can also be adjusted from 2.5V to 5.5V with
external resistors, R3 and R4, as shown in Figure 8. To
set the output voltage externally, select resistor R4 in
the 10k ? to 200k ? range. Calculate R3 using:
R3 = R4 [(V OUT / 1.25V) - 1]
off time reduces transient input current when the LCD is
activated.
Shutdown: ON and LCDON
A logic-low level at ON shuts down all MAX1677 cir-
cuits including the LCD converter, reference, and LBI
comparator. A logic-high level at LCDON activates the
LCD boost converter. The LCD boost converter can
only be activated when ON is high. When ON is low,
the MAX1677 draws 1μA.
Setting the LCD Output Voltage
For either positive or negative LCD output voltages, set
the voltage with two external resistors, R1 and R2, as
shown in Figures 2 and 3. Since the input current at FB
has a maximum of 50nA, large resistors can be used
without significant accuracy loss. Begin by selecting R2
V IN (V TRIP : V H , V L )
POUT
Low-Battery Comparator
R5
MAX1677
R8
The MAX1677 has an on-chip comparator for low-bat-
tery detection. If the voltage at LBI falls below 614mV,
LBO (an open-drain output) sinks current to GND. The
R6
LBI
LBO
100k
low-battery trip level is set by two resistors (Figure 6).
Since the LBI input current is less than 50nA, large
resistor values (R6 ≤ 130k ? ) can be used to minimize
input loading. Calculate R5 as follows:
R7
[
V H = 0.614V 1+ R5 + R5
R5 = R6 [(V TRIP / 0.614V) - 1]
Connect a pullup resistor (R8) to LBO when driving
CMOS logic. LBO is an open-drain output and can be
R7 R6
]
R6 R7- R8
V L = 0.614V + R5 ( 0.614V - ( V POUT + 0.614V
) )
pulled as high as 6V regardless of the voltage at OUT.
When LBI is above 0.614V, LBO is high impedance. If
the LBI comparator is not used, ground LBI.
Since the low-battery comparator is noninverting, hys-
teresis can be added by connecting a resistor (R7)
from LBI to LBO as shown in Figure 7. When LBO is
WHERE V H IS THE RISING V TRIP LEVEL
AND V L IS THE FALLING V TRIP LEVEL.
Figure 7. Adding External Hysteresis to the LBI Comparator
V IN (V TRIP )
POUT
MBC OUTPUT
POUT
LOGIC POWER
MAX1677
R3
R5
LBI
MAX1677
R8
FB
R4
LBO
LOW-BATTERY OUTPUT
R6
GND
Figure 6. Setting the Low-Battery Trip Threshold
Figure 8. Setting the MBC Output Voltage Externally
12
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