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參數(shù)資料
| 型號(hào)： | MAX763ACSA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.3V, Step-Down, Current-Mode PWM DC-DC Converters |
| 中文描述： | 2 A SWITCHING REGULATOR, 212.5 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 135K |
| 代理商： | MAX763ACSA |
M
3.3V, S tep-Down,
Current-Mode PWM DC-DC Converters
8
_______________________________________________________________________________________
Production Method
Inductors
Capacitors
Sumida
CD105 series
Coiltronics
CTX series
Coilcraft
DT series
Sumida
RCH895 series
Renco
RL1284 series
Matsuo
267 series
Sprague
595D/293D series
Surface Mount
High Performance/
Miniature Through-Hole
Sanyo
OS-CON series (very low ESR)
Nichicon
PL series (low ESR)
Through-Hole
Phone and FAX Numbers:
Coilcraft
USA:
Coiltronics
USA:
Matsuo
USA:
J apan: (06) 332-0871
Nichicon
USA:
J apan: (03) 3607-5111, FAX: (03) 3607-5428
(708) 639-6400, FAX: (708) 639-1469
(305) 781-8900, FAX: (305) 782-4163
(714) 969-2491, FAX: (714) 960-6492
Renco
Sanyo
Sprague Elec. Co.
Sumida
USA:
USA:
USA:
USA:
(516) 586-5566, FAX: (516) 586-5562
(0720) 70-1005, FAX: (0720) 70-1174
(603) 224-1961, FAX: (603) 224-1430
(708) 956-0666, FAX: (708) 956-0702
(708) 843-7500, FAX: (708) 843-2798
Table 3. External Component Suppliers
normal operation, connect
SHDN
to V+. Coming out of
shutdown mode initiates an SS cycle.
Continuous-/Disc ontinuous-
Conduc tion Modes
The input voltage, output voltage, load current, and
inductor value determine whether the IC operates in
continuous or discontinuous mode. As the inductor
value or load current decreases, or the input voltage
increases, the MAX748A/MAX763A tend to operate in
discontinuous-conduction mode (DCM). In DCM, the
inductor current slope is steep enough so it decays to
zero before the end of the transistor off-time. In contin-
uous-conduction mode (CCM), the inductor current
never decays to zero, which is typically more efficient
than DCM. CCM allows the MAX748A/MAX763A to
deliver maximum load current, and is also slightly less
noisy than DCM, because it doesn’t exhibit the ringing
that occurs when the inductor current reaches zero.
Internal Referenc e
The +1.23V bandgap reference supplies up to 100μA
at REF. A 1000pF bypass capacitor from REF to GND
is required.
Osc illator
The MAX748A/MAX763A’s internal oscillator is guaran-
teed to operate in the 159kHz to 212.5 kHz range over
temperature for V+ = 5V. Temperature stability over the
military temperature range is about 0.04%/°C.
Undervoltage Loc kout
The undervoltage lockout feature monitors the supply
voltage at V+ and allows operation to start when V+
rises above 2.95V. When V+ falls, operation continues
until the supply voltage falls below 2.7V (typ). When an
undervoltage condition is detected, control logic turns
off the output power FET and discharges the SS capac-
itor to ground. This prevents partial turn-on of the power
MOSFET and avoids excessive power dissipation. The
control logic holds the output power FET off until the
supply voltage rises above approximately 2.95V, at
which time an SS cycle begins. When the input voltage
exceeds the undervoltage lockout threshold, switching
action will occur, but the output will not be regulated
until the input voltage exceeds 3.3V (no load). The
exact input voltage required for regulation depends on
load conditions (see the Output Voltage vs. Supply
Voltage graph in the Typical Operating Characteristics.
S hutdown Mode
The MAX748A/MAX763A are held in shutdown mode
by keeping
SHDN
at ground. In shutdown mode, the
output drops to 0V and the output power FET is held in
an off state. The internal reference also turns off, which
causes the SS capacitor to discharge. Typical supply
current in shutdown mode is 0.2μA. The actual design
limit for shutdown current is much less than the 100μA
specified in the Electrical Characteristics. However,
testing to tighter limits is prohibitive because the cur-
rent takes several seconds to settle to a final value. For
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX763ACSA+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX763ACSA+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX763ACSA-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX763ACSA-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX763AEPA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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