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參數(shù)資料
| 型號(hào)： | MAX786CAI |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 13/20頁(yè) |
| 文件大?。?/td> | 305K |
| 描述： | IC REG QD BCK/LINEAR SYNC 28SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 46 |
| 拓?fù)洌?/td> | 降壓（降壓）同步（2），線性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 4 |
| 頻率 - 開(kāi)關(guān)： | 300kHz，200kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 電壓/電流 - 輸出 3： | 5V，5mA |
| 帶 LED 驅(qū)動(dòng)器： | 無(wú) |
| 帶監(jiān)控器： | 無(wú) |
| 帶序列發(fā)生器： | 無(wú) |
| 電源電壓： | 5.5 V ~ 30 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 管件 |
| 其它名稱： | 146982F |
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Dual-Output Power-Supply
Controller for Notebook Computers
______________________________________________________________________________________ 13
Table 1. Surface-Mount Components
(See Figure 1 for Standard Application Circuit.)
Internal VL and REF Supplies
An internal linear regulator produces the 5V used by the
internal control circuits. This regulators output is avail-
able on pin VL and can source 5mA for external loads.
Bypass VL to GND with 4.7礔. To save power, when the
+5V switch-mode supply is above 4.5V, the internal lin-
ear regulator is turned off and the high-efficiency +5V
switch-mode supply output is connected to VL.
The internal 3.3V bandgap reference (REF) is powered
by the internal 5V VL supply. It can furnish up to 5mA.
Bypass REF to GND with 0.22礔, plus 1礔/mA of load
current. The main switching outputs track the reference
voltage. Loading the reference will reduce the main
outputs slightly, according to the reference load-regula-
tion error.
Both the VL and REF outputs remain active, even when
the switching regulators are turned off, to supply mem-
ory keep-alive power (see Shutdown Modesection).
These linear-regulator outputs can be directly connected
to the corresponding step-down regulator outputs (i.e.,
REF to +3.3V, VL to +5V) to keep the main supplies alive
in standby mode. However, to ensure start-up, standby
load currents must not exceed 5mA on each supply.
Fault Protection
The +3.3V and +5V PWM supplies and the compara-
tors are disabled when either of two faults is present:
VL < +4.0V or REF < +2.8V (85% of its nominal value).
__________________Design Procedure
Figure 1s schematic and Table 2s component list
show values suitable for a 3A, +5V supply and a 3A,
+3.3V supply. This circuit operates with input voltages
from 6.5V to 30V, and maintains high efficiency with
output currents between 5mA and 3A (see the Typical
Operating Characteristics). This circuits components
may be changed if the design guidelines described in
this section are usedbut before beginning the
design, the following information should be firmly
established:
COMPONENT
SPECIFICATION
MANUFACTURER
PART NO.
C1, C10 33礔, 35V tantalum capacitors
AVX
TPSE226M035R0100
Sprague
595D336X0035R
C2 4.7礔, 6V tantalum capacitor
AVX
TAJB475M016
Sprague
595D475X0016A
C3 1礔, 20V tantalum capacitor
AVX
TAJA105M025
Sprague
595D105X0020A2B
C4, C5 0.1礔, 16V ceramic capacitors
Murata-Erie
GRM42-6X7R104K50V
C6 330礔, 10V tantalum capacitor
Sprague
595D337X0010R
C7, C12 150礔, 10V tantalum capacitors
Sprague
595D157X0010D
C8, C9 0.01礔, 16V ceramic capacitors
Murata-Erie
GRM42-6X7R103K50V
D2A, D2B 1N4148-type dual diodes
Central Semiconductor
CMPD2836
D1, D3 1N5819 SMT diodes
Nihon
EC10QS04
L1, L2 10礖, 2.65A inductors
Sumida
CDR125-100
N1N4 N-channel MOSFETs (SO-8)
Siliconix
Si9410DY
R1, R2 0.025&, 1% (SMT) resistors
IRC
LR2010-01-R025-F
COMPANY
FACTORY FAX
USA PHONE
[COUNTRY CODE]
AVX
[1] (803) 626-3123
(803) 946-0690
(800) 282-4975
Central Semiconductor [1] (516) 435-1824 (516) 435-1110
IRC
[1] (512) 992-3377 (512) 992-7900
Murata-Erie
[1] (814) 238-0490 (814) 237-1431
Nihon
[81] 3-3494-7414 (805) 867-2555
Siliconix
[1] (408) 970-3950 (408) 988-8000
Sprague
[1] (603) 224-1430 (603) 224-1961
Sumida
[81] 3-3607-5144 (847) 956-0666
Table 2. Component Suppliers
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX786CAI+ | 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual-Output Power Supply Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX786CAI+T | 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual-Output Power Supply Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX786CAI-T | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX786EAI | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX786EAI+ | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
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