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参数资料
| 型号： | MAX1677EEE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16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
R3
10 ?
3.3V MAIN
FEEDBACK
POUT
P
OUT
POUT
BOOST OUTPUT
REF
C4
0.1 μ F
GND
MAX1677
LX
L1
10 μ H
C2
100 μ F
V IN
R Q
S
N
LX
LCDLX
L2
10 μ H
C1
100 μ F
PWM-MODE
LCDON
CLK/SEL
ON
REF
FB
C5
0.1 μ F
D2
MBR0530
LCD BOOST OUTPUT
CURRENT-
LIMIT LEVEL
OSC
PGND
C3
LCDPOL
PGND
LCDGND
LCDFB
R1
4.7 μ F
Figure 4. Controller Block Diagram in PWM Mode
output voltage. In PWM mode, the MBC can supply up
to 350mA. Switching harmonics generated by the fixed-
R2
Figure 2. LCD Converter in Positive Mode
R3
10 ?
3.3V MAIN
frequency operation are consistent and easily filtered.
During PWM operation, the rising edge of the internal
clock sets a flip-flop, which turns on the N-channel
MOSFET (Figure 4). The switch turns off when the sum
of the voltage-error, slope-compensation, and current-
feedback signals trips the multi-input comparator and
resets the flip-flop; the switch remains off for the rest of
the cycle. Changes in the output voltage error signal
shift the inductor current level and modulate the MOS-
FET pulse width.
OUT
POUT
BOOST OUTPUT
Clock-Synchronized PWM
C4
0.1 μ F
GND
MAX1677
LX
L1
10 μ H
L2
10 μ H
C2
100 μ F
V IN
C1
100 μ F
The MAX1677 operates as a clock-synchronized cur-
rent-mode PWM when a clock signal (200kHz to
400kHz) is applied to CLK/SEL. This allows switching
harmonics to be positioned to avoid sensitive frequen-
cy bands, such as those near IF frequencies in wireless
LCDLX
C6
D2
applications.
LCDON
CLK/SEL
ON
LCDPOL
PGND
REF
FB
LCDGND
LCDFB
0.1 μ F
0.1 μ F MBR0530
R2 R1
C5 D3
MBR0530
-LCD BOOST
OUTPUT
C3
4.7 μ F
Low Power PFM Mode
Pulling CLK/SEL low places the MAX1677 in low-power
standby mode. During standby mode, PFM operation
regulates the output voltage by transferring a fixed
amount of energy during each cycle, and then modulat-
ing the switching frequency to control the power deliv-
ered to the output. The device switches only as needed
to service the load, resulting in the highest possible effi-
ciency at light loads and an operating current of only
20μA. The MBC can supply up to 170mA when in PFM
mode (Table 1).
Figure 3. LCD Converter in Negative Mode
10
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