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参数资料
| 型号： | MAX1777EEI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/32页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BUCK/LINEAR 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 200kHz ~ 500kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 电压/电流 - 输出 3： | 3.3V，100mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 4.5 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
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High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Pin Description
PIN
MAX1777
MAX1977
MAX1999
NAME
FUNCTION
3.3V SMPS Current-Sense Input. Connect CS3 to a current-sensing resistor from the source of
1
—
CS3
the synchronous rectifier to GND. The voltage at ILIM3 determines the current-limit threshold
(see the Current-Limit (ILIM) Circuit section).
—
2
1
2
N.C.
PGOOD
No Connection. Not internally connected.
Power-Good Output. PGOOD is an open-drain output that is pulled low if either output is
disabled or is more than 10% below its nominal value.
3.3V SMPS Enable Input. The 3.3V SMPS is enabled if ON3 is greater than the SMPS on level
3
3
ON3
and disabled if ON3 is less than the SMPS off level. If ON3 is connected to REF, the 3.3V
SMPS starts after the 5V SMPS reaches regulation (delay start). Drive ON3 below the clear
fault level to reset the fault latches.
5V SMPS Enable Input. The 5V SMPS is enabled if ON5 is greater than the SMPS on level and
4
4
ON5
disabled if ON5 is less than the SMPS off level. If ON5 is connected to REF, the 5V SMPS
starts after the 3.3V SMPS reaches regulation (delay start). Drive ON5 below the clear fault
level to reset the fault latches.
3.3V SMPS Current-Limit Adjustment. The GND-LX current-limit threshold defaults to 100mV if
5
5
ILIM3
ILIM3 is tied to V CC . In adjustable mode, the current-limit threshold is 1/10th the voltage seen
at ILIM3 over a 0.5V to 3V range. The logic threshold for switchover to the 100mV default value
is approximately V CC - 1V. Connect ILIM3 to REF for a fixed 200mV threshold.
Shutdown Control Input. The device enters its 6μA supply current shutdown mode if
V SHDN is less than the SHDN input falling edge trip level and does not restart until V SHDN is
6
6
SHDN
greater than the SHDN input rising edge trip level. Connect SHDN to V+ for automatic startup.
SHDN can be connected to V+ through a resistive voltage-divider to implement a
programmable undervoltage lockout.
7
7
FB3
3.3V SMPS Feedback Input. Connect FB3 to GND for fixed 3.3V operation. Connect FB3 to a
resistive voltage-divider from OUT3 to GND to adjust the output from 2V to 5.5V.
2V Reference Output. Bypass to GND with a 0.22μF (min) capacitor. REF can source up to
8
8
REF
100μA for external loads. Loading REF degrades FB_ and output accuracy according to the
REF load-regulation error.
9
9
FB5
5V SMPS Feedback Input. Connect FB5 to GND for fixed 5V operation. Connect FB5 to a
resistive voltage-divider from OUT5 to GND to adjust the output from 2V to 5.5V.
Overvoltage and Undervoltage Fault Protection Enable/Disable. Connect PRO to V CC to
10
10
PRO
disable undervoltage and overvoltage protection. Connect PRO to GND to enable
undervoltage and overvoltage protection (see the Fault Protection section).
5V SMPS Current-Limit Adjustment. The GND-LX current-limit threshold defaults to 100mV if
11
11
ILIM5
ILIM5 is tied to V CC . In adjustable mode, the current-limit threshold is 1/10th the voltage seen
at ILIM5 over a 0.5V to 3V range. The logic threshold for switchover to the 100mV default value
is approximately V CC - 1V. Connect ILIM5 to REF for a fixed 200mV threshold.
Low-Noise Mode Control. Connect SKIP to GND for normal idle-mode (pulse-skipping)
12
12
SKIP
operation or to V CC for PWM mode (fixed frequency). Connect to REF or leave floating for
ultrasonic mode (pulse skipping, 25kHz minimum).
12
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