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| 型号： | MAX1777EEI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 2/32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
ABSOLUTE MAXIMUM RATINGS
V+, SHDN to GND ..................................................-0.3V to +25V
BST_ to GND ..........................................................-0.3V to +30V
LX_ to BST_ ..............................................................-6V to +0.3V
CS_ to GND (MAX1777/MAX1977 only)......................-2V to +6V
V CC , LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,
FB3, FB5, SKIP , PRO , PGOOD to GND ...............-0.3V to +6V
DH3 to LX3 ..............................................-0.3V to (V BST3 + 0.3V)
DH5 to LX5 ..............................................-0.3V to (V BST5 + 0.3V)
ILIM3, ILIM5 to GND...................................-0.3V to (V CC + 0.3V)
DL3, DL5 to GND....................................-0.3V to (V LDO5 + 0.3V)
TON to GND (MAX1999 only)...................................-0.3V to +6V
LDO3, LDO5, REF Short Circuit to GND ....................Momentary
LDO3 Current (Internal Regulator) Continuous ..............+100mA
LDO3 Current (Switched Over to OUT3) Continuous.....+200mA
LDO5 Current (Internal Regulator) Continuous ..............+100mA
LDO5 Current (Switched Over to OUT5) Continuous.....+200mA
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = V CC , V SHDN = 5V,
T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAIN SMPS CONTROLLERS
V+ Input Voltage Range
LDO5 in regulation
V+ = LDO5, V OUT5 < 4.43V
6
4.5
24
5.5
V
3.3V Output Voltage in
Fixed Mode
V+ = 6V to 24V, FB3 = GND, V SKIP = 5V
3.285
3.330
3.375
V
V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,
5V Output Voltage in Fixed Mode
MAX1777/MAX1999 (TON = V CC )
4.975
5.050
5.125
V
V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,
MAX1977/MAX1999 (TON = GND)
Output Voltage in
Adjustable Mode
Output Voltage Adjust Range
FB3, FB5 Adjustable-Mode
Threshold Voltage
V+ = 6V to 24V, either SMPS
Either SMPS
Dual-mode comparator
1.975
2.0
0.1
2.00
2.025
5.5
0.2
V
V
V
Either SMPS, V SKIP = 5V, 0 to 5A
-0.1
DC Load Regulation
Line Regulation
Either SMPS, SKIP = GND, 0 to 5A
Either SMPS, V SKIP = 2V, 0 to 5A
Either SMPS, 6V < V+ < 24V
-1.5
-1.7
0.005
%
%/V
Current-Limit Threshold
(Positive, Default)
ILIM_ = V CC , GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
93
100
107
mV
Current-Limit Threshold
(Positive, Adjustable)
GND - CS_
(MAX1777/MAX1977),
GND - LX_ (MAX1999)
V ILIM_ = 0.5V
V ILIM_ = 1V
V ILIM_ = 2V
40
93
185
50
100
200
60
107
215
mV
Zero-Current Threshold
Current-Limit Threshold
(Negative, Default)
Soft-Start Ramp Time
SKIP = GND, ILIM_ = V CC , GND - CS_
(MAX1777/MAX1977), GND - LX_ (MAX1999)
SKIP = ILIM_ = V CC , GND - CS_ (MAX1777/MAX1977),
GND - LX_ (MAX1999)
Zero to full limit
3
-120
1.7
mV
mV
ms
2
_______________________________________________________________________________________
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