參數(shù)資料
型號(hào)： MAX1761EEE
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： Replaced by TMS320VC5506 : Digital Signal Processor 100-LQFP
中文描述： SWITCHING CONTROLLER, 428 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-16
文件頁(yè)數(shù)： 9/23頁(yè)
文件大?。?/td> 473K
代理商： MAX1761EEE
M
Small, Dual, High-Efficiency
Buck Controller for Notebooks
_______________________________________________________________________________________
9
Typical Application Circuit
The typical application circuit in Figure 1 generates two
low-voltage rails for general-purpose use in notebook
and subnotebook computers (I/O supply, fixed CPU
core supply, DRAM supply). This DC-DC converter
steps down a battery or AC adapter voltage to voltages
from 1.0V to 5.5V with high efficiency and accuracy.
See Table 1 for a list of components for common appli-
cations. Table 2 lists component manufacturers.
Detailed Description
The MAX1761 dual buck controller is designed for low-
voltage power supplies in notebook and subnotebook
computers. Maxim
’
s proprietary Quick-PWM pulse-
width modulation circuit (Figure 2) is specifically
designed for handling fast load steps while maintaining
a relatively constant operating frequency over a wide
range of input voltages. The Quick-PWM architecture
circumvents the poor load-transient timing problems of
fixed-frequency current-mode PWMs while preventing
problems caused by widely varying switching frequen-
cies in conventional constant-on-time and constant-off-
time PWM schemes.
This MAX1761 controls two synchronously rectified out-
puts with complementary N- and P-channel MOSFETs.
Using the P-channel for the high-side MOSFET elimi-
nates external boost capacitors and diodes, reducing
PC board area and cost. The MAX1761 can step down
input voltages from 5V to 20V, to outputs ranging from
1V to 5.5V on either output. Dual Mode feedback inputs
allow fixed output voltages of 2.5V and 1.8V for OUT1
and OUT2, respectively; or, a resistive voltage-divider
can be used to adjust the output voltages from 1V to
5.5V. Other appropriate applications for this device are
digital cameras, large PDAs, and handy-terminals.
V+ Input and VL +5V Logic Supplies
The MAX1761 has a 5V to 20V input voltage supply
range. A linear regulator powers the control logic and
other internal circuitry from the input supply pin (V+).
The linear regulator
’
s 4.65V output is available at VL
and can supply 25mA to external circuitry. When used
as an external supply, bypass VL to GND with a 4.7μF
capacitor. VL is turned off when the device is in shut-
down, and drops to approximately 4V when the device
experiences an output voltage fault.
The MAX1761 includes an input undervoltage lockout
(UVLO) circuit that prevents the device from switching
until VL > 4.25V (max). UVLO ensures there is sufficient
drive for the external MOSFETs, prevents the high-side
MOSFET from being turned on for near 100% duty
cycle, and keeps the output in regulation. The UVLO
DL1
CS1
OUT1
VL
DH1
R3
R4
R1
R2
FB1
GND
ON2
REF
DL2
OUT2
CS2
DH2
FB2
V+
ON1
2.5V
+1.8V
220
μ
F
10
μ
F
7
μ
H
4.7
μ
F
0.1
μ
F
7
μ
H
LX2
LX1
220
μ
F
V
OUT1
5V < V
BATT
< 20V
V
OUT2
0.1
μ
F
MAX1761
10
Figure 1. Typical Application Circuit
相關(guān)PDF資料
PDF描述
MAX1763 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763EEE 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763EUE Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85
MAX1765 Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85
MAX1765EEE 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1761EEE+ 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual Buck 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
MAX1761EEE+T 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual Buck 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
MAX1761EEE-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
MAX1761EVKIT 功能描述:DC/DC 開(kāi)關(guān)控制器 Evaluation Kit for the MAX1761 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
MAX1762EUB 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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