參數(shù)資料
型號： MAX1549ETL+T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output
中文描述： 3 A DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, QCC40
封裝： 6 X 6 MM, 0.80 MM HEIGHT, MO-220WJJD-2, TQFN-40
文件頁數(shù)： 1/35頁
文件大?。?/td> 933K
代理商： MAX1549ETL+T
General Description
The MAX1549 dual pulse-width modulation (PWM) step-
down controller provides the high efficiency, excellent
transient response, and high DC-output accuracy nec-
essary for generating low-voltage chipset and RAM
power supplies in notebook computers. The controller
employs a fixed-frequency, current-mode PWM archi-
tecture that does not require complex compensation.
The MAX1549 also interleaves the dual step-down regu-
lators, minimizing the input capacitor requirements.
The MAX1549 features differential current-sense inputs
for accurately sensing the inductor current across an
external current-sense resistor in series with the output
to ensure reliable overload protection. Alternatively, the
controller can provide overload protection using loss-
less inductor current-sensing methods, lowering power
dissipation and reducing system cost.
Single-stage buck conversion allows the MAX1549 to
directly step down high-voltage batteries for the highest
possible efficiency. Very low output-voltage applica-
tions require two-stage conversion—stepping down
from another system supply rail instead of the battery.
The MAX1549 powers chipsets and graphics processor
cores that require dynamically adjustable output voltages,
or generates the active termination bus that must track
the input reference. The main step-down controller
(OUT1) regulates the dedicated reference input (REFIN)
voltage generated by a resistive voltage-divider from the
MAX1549’s reference. The MAX1549 also includes inter-
nal open-drain pulldowns with logic-level control inputs to
dynamically adjust the REFIN resistive-divider ratio. When
a transition occurs on these control inputs, the controller
enters forced-PWM mode and blanks the power-good
(PGOOD1) output and output fault protection. OUT2 uses
a Dual-Mode feedback input to provide either fixed
2.5V/1.8V or adjustable output voltage regulation. The
MAX1549 is available in a 40-pin, 6mm x 6mm thin QFN
package.
Applications
Notebook Computers
Dynamically Adjustable Chipset Supplies
Video/GPU Core Supplies
DDR Memory Termination
CPU Core or VCC Supplies
Fixed Chipset/RAM Supplies
Active Termination Buses
Features
Interleaved, Fixed-Frequency, Current-Mode
Control Architecture
1% VOUT Accuracy Over Line and Load
Main Output (OUT1)
0.5V to 2.0V Adjustable Output
External Reference Input for Dynamically
Selectable Output Voltages
Four Digitally Selectable Output Voltages
Power-Good and Fault Blanking During
Transitions
Second Output (OUT2)
2.5V/1.8V Fixed or 0.5V to 2.7V Adjustable
Output
Accurate Differential Current-Sense Inputs
100kHz/200kHz/300kHz/400kHz Selectable
Switching Frequency
Output Overvoltage/Undervoltage Protection
Soft-Start and Soft-Shutdown
Drives Large Synchronous-Rectifier FETs
2V ±0.6% Reference Output
Separate Enable Inputs with Accurate Threshold
Voltages
Separate Power-Good Window Comparators
MAX1549
Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
________________________________________________________________ Maxim Integrated Products
1
40
36
37
38
39
18
21
23
22
24
25
19 20
16 17
6
5
4
3
2
1
7
8
9
10
11 12 13 14 15
26
27
28
29
30
31
32
33
34
35
FBLANK
ON1
REFIN
MAX1549
THIN QFN
6mm x 6mm
TOP VIEW
OD3
OD2
OD1
CSH1
CSL1
OUT1
PGOOD1
DH1
N.C.
FSEL
CSH2
ON2
FB2
CSL2
PGOOD2
OUT2
N.C.
DH2
LX1
BST1
SKIP
DL1
VDD
N.C.
DL2
PGND
BST2
LX2
G1
G0
ILIM2
ILIM1
CC1
VCC
REF
N.C.
GND
Pin Configuration
Ordering Information
19-3165; Rev 1; 5/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION
KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
MAX1549ETL
-40°C to +85°C
40 Thin QFN 6mm x 6mm
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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相關代理商/技術參數(shù)
參數(shù)描述
MAX1549EVKIT 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX154ACAG 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX154ACAG+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX154ACAG+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX154ACAG-T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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