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參數(shù)資料
| 型號： | MAX1626ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, MS-012A, SOIC-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 185K |
| 代理商： | MAX1626ESA |
________________________Applic ations
The MAX1626/MAX1627 typical operating circuits
(Figures 1 and 8) are designed to output 2A at a 5V
output voltage. The following circuits provide examples
and guidance for other applications.
Mic ropower S tep-Down Converter
When designing a low-power, battery-based applica-
tion, choose an external MOSFET with low gate capaci-
tance (to minimize switching losses), and use a low
peak current limit to reduce I
2
R losses. The circuit in
Figure 9 is optimized for 0.5A.
High-Current S tep-Down Converter
The circuit in Figure 10 outputs 6A at 2.5V from a 5V or
3.3V input. High-current design is difficult, and board
layout is critical due to radiated noise, switching tran-
sients, and voltage gradients on the PC board traces.
Figure 11 is a recommended PC board design. Choose
the external MOSFET to minimize R
DS(ON)
. Keep the
gate-charge factor below the MAX1626/MAX1627’s
drive capability (see Ext Rise and Fall Times vs.
C apacitance graph in the Typical Operating
Characteristics). Otherwise, increased MOSFET rise
and fall times will contribute to efficiency losses. For
higher efficiencies, especially at low output voltages,
the MAX796 family of step-down controllers with syn-
chronous rectification is recommended.
M
5V /3.3V or Adjustable, 100% Duty-Cyc le,
High-Effic ienc y, S tep-Down DC-DC Controllers
______________________________________________________________________________________
13
MAX1627
C5
0.47
μ
F
P
D1
R
SENSE
0.15
U1
LOGIC-LEVEL MOSFET
L1
22
μ
H, 3A
C4
0.1
μ
F
OUT
N.C.
SHDN
REF
V+
EXT
CS
GND
FB
INPUT
R3
R2
C
R2
C1
220
μ
F
LOW-ESR
TANTALUM
C2
68
μ
F LOW-ESR
TANTALUM
C3
68
μ
F LOW-ESR
TANTALUM
L1: SUMIDA CDRH125-220
D1: NIHON NSQ03A03
U1: MOTOROLA MMSF3P02HD
ADJUSTABLE
OUTPUT
Figure 8. MAX1627 Typical Operating Circuit
MAX1626
C3
0.47
μ
F
P
D1
R
0.15
U1
LOGIC-LEVEL MOSFET
C4
0.1
μ
F
3/5
SHDN
REF
V+
EXT
CS
GND
OUT
INPUT
L1
68
μ
H, 0.7A
OUTPUT
C1
100
μ
F
LOW-ESR
TANTALUM
C2
68
μ
F LOW-ESR
TANTALUM
L1: SUMIDA CDR1053-680
D1: MOTOROLA MBRS130T3
U1: MOTOROLA MMSF3P02HD
Figure 9. 0.5A Step-Down Converter
MAX1627
OUT
P
OUTPUT
2.5V, 6A
R3
21.5k, 1%
R2
20k, 1%
D1
C
220pF
Q1
LOGIC-LEVEL MOSFET
L1
2.7
μ
H >8A
C10
0.1
μ
F
3V TO6V
SHDN
REF
N.C.
V+
EXT
CS
GND
FB
INPUT
C4
100
μ
F
C5
100
μ
F
C9
1.0
μ
F
R
, R
CS2
0.025
C8
1.0
μ
F
C7
0.1
μ
F
C3
220
μ
F
C2
220
μ
F
C1
220
μ
F
C6
0.1
μ
F
C1–C3: SANYOOS-CON220
μ
F,
6.3V
C4, C5: SANYOOS-CON100
μ
F,
20V
RCS1, RCS2: 0.025
DALE WSL-2512
Q1: MOTOROLA MTB50PO3HDL
D1: NIEC C10T04Q
L1: SUMIDA CDRH127-2R7NC
Figure 10. 6A Step-Down Converter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1627ESA | 5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers |
| MAX1626-MAX1627 | 5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers |
| MAX1630 | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1631 | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1631CAI | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1626ESA+ | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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 |
| MAX1626ESA+T | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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 |
| MAX1626ESA-T | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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 |
| MAX1626EVKIT | 功能描述:DC/DC 開關(guān)控制器 3V/3.3V 100% Duty-Cycle High-Efficiency Step-Down DC-DC Controller 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 |
| MAX1626EVKIT-SO | 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1626 MAX1627 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 |
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