- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383344 > MAX1994ETM (MAXIM INTEGRATED PRODUCTS INC) Dual Step-Down Controllers Plus Linear- Regulator Controller for Notebook Computers PDF資料下載
參數(shù)資料
| 型號： | MAX1994ETM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual Step-Down Controllers Plus Linear- Regulator Controller for Notebook Computers |
| 中文描述： | DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CQCC48 |
| 封裝： | 7 X 7 MM, 0.80 MM HEIGHT, THIN, QFN-48 |
| 文件頁數(shù)： | 22/49頁 |
| 文件大?。?/td> | 983K |
| 代理商： | MAX1994ETM |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當(dāng)前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁
M
Dual Step-Down Controllers Plus Linear-
Regulator Controller for Notebook Computers
22
______________________________________________________________________________________
PIN
NAME
FUNCTION
25
OVPSET
Overvoltage Protection Control Input. This pin controls the OVP functions for BUCK1 and BUCK2. LINFB is
not affected by OVPSET. Connect OVPSET to V
CC
to disable overvoltage protection for both BUCK1 and
BUCK2. Connect OVPSET to GND for default overvoltage threshold of 2.0V (MAX1816) or 2.25V (MAX1994)
for BUCK1, measured at FBS. The OVP threshold for BUCK2 is always at 115% of the nominal output
voltage. The OVP threshold for BUCK1 can be adjusted by connecting OVPSET between 1.0V and 2.0V. An
overvoltage condition occurs if V
FBS
> V
OVPSET
(MAX1816) or V
FBS
> 1.125
×
V
OVPSET
(MAX1994).
Undervoltage protection thresholds are always enabled and are not affected by this pin.
26
TIME
Slew Rate Adjustment Input. Connect a resistor from TIME to GND to set the internal slew-rate clock. A
680k
to 68k
resistor to GND sets the clock from 53kHz to 530kHz, f
SLEW
= 252kHz
×
(143k
/ R
TIME
).
Linear Regulator Feedback Input. The linear regulator
’
s feedback set point is 1.0V. Connect a resistive
voltage-divider from the collector of the external PNP pass transistor to LINFB. The DC bias current in the
voltage-divider should be greater than 10μA. The linear regulator is active whenever LIN/
SDN
is high.
Open-Drain Power-Good Output for the Linear Regulator. As soon as LINFB is in regulation, LINGOOD
goes high after a 1ms minimum delay. When the output goes out of regulation or LIN/
SDN
goes low,
LINGOOD is forced low within approximately 10μs. A pullup resistor on LINGOOD causes additional
shutdown current.
27
LINFB
28
LINGOOD
29
LINBSE
Linear Regulator Base Drive. Connect LINBSE to the base of an external PNP power transistor. Add a 220
pullup resistor between the base and the emitter.
30
AGND
Analog Ground. Connect the MAX1816/MAX1994s
’
exposed backside pad and low-current ground
terminations to AGND. The current-limit comparator
’
s ground sense for BUCK2 also connects to AGND.
Analog Supply Voltage Input for BUCK1, BUCK2, and the Linear Regulator. This pin supplies all power to
the device except for the MOSFET drivers. The range for V
CC
is 4.5V to 5.5V. Bypass V
CC
to GND with a
minimum capacitance of 1μF. The maximum resistance between V
CC
and V
DD
should be 10
.
2.0V Reference Output. Bypass REF to GND with a minimum capacitance of 0.22μF. The reference is
trimmed with a nominal 50μA load, and can source a total of 100μA for external loads. Loading REF greater
or less than 50μA decreases output-voltage accuracy according to the limits defined in the
Electrical
Characteristics
table.
31
V
CC
32
REF
33
FB2
Adjustable Feedback Input for BUCK2. In adjustable mode, FB2 regulates to 1.00V. It also selects default
voltage. Connect FB2 to GND for 2.5V output, or connect FB2 to V
CC
for 1.8V output.
Output Voltage Connection for BUCK2. Connect directly to the junction of the output filter capacitors. OUT2
senses the output voltage to determine the on-time and also serve as the feedback input in fixed-output
modes.
Current-Sense Input for BUCK2. For accurate current limit, connect CS2 to a sense resistor between the
source of the low-side MOSFET and ground. Alternatively, CS2 can be connected to LX2 for lossless
current sensing across the low-side MOSFET. The current-limit sense voltage for CS2 is set at the ILIM2
BUCK2 Current-Limit Adjustment Input. The current-limit threshold measured between AGND and CS2
defaults to 50mV when ILIM2 is connected to V
CC
. In adjustable mode, the current-limit threshold voltage is
precisely 1/10th of the voltage at ILIM2. The logic threshold for switchover to the default value is
approximately V
CC
- 1V.
Battery Voltage Sense Input. V+ is used only for PWM one-shot timing. DH1 and DH2 on-times are inversely
proportional to input voltage over a 2V to 28V range.
34
OUT2
35
CS2
36
ILIM2
37
V+
38
BST2
BUCK2 Boost Flying Capacitor Connection. An optional resistor in series with BST2 allows the DH1 pullup
current to be adjusted.
Pin Description (continued)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1816 | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| MAX1816ETM | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| MAX199AEWI | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX199AMYI | Circular Connector; No. of Contacts:18; Series:MS27505; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle RoHS Compliant: No |
| MAX199ACAI | Multi-Range (【4V, 【2V, +4V, +2V), +5V Supply, 12-Bit DAS with 8+4 Bus Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1994ETM+ | 功能描述:DC/DC 開關(guān)控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1994ETM+T | 功能描述:DC/DC 開關(guān)控制器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1994ETM-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1994EVKIT | 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1816 MAX1980 MAX1994 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1995EGI | 功能描述:顯示驅(qū)動(dòng)器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。