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參數(shù)資料
| 型號： | MAX887 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter |
| 中文描述： | 100%占空比、低噪聲、降壓型、PWM DC-DC轉換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 146K |
| 代理商： | MAX887 |
M
100% Duty Cyc le, Low-Noise,
S tep-Down, PWM DC-DC Converter
_______________________________________________________________________________________
7
______________________________________________________________Pin Desc ription
NAME
FUNCTION
1
SHDN
Shutdown, Active-Low, Logic-Level Input. Connect
SHDN
to V+ for normal operation.
2
FB
Feedback Input. Connect FB to a resistor voltage divider between the output and GND.
PIN
3
REF
Reference Bypass Output. Connect a 0.047μF capacitor to GND very close to the MAX887, within 0.2 in. (5mm).
4
VL
3.3V Internal Logic Regulator Output. Bypass VL to GND with a 2.2μF capacitor very close to the MAX887,
within 0.2 in. (5mm).
8
V+
Supply-Voltage Input. 3.5V min to 11V max. Bypass V+ to GND with a 0.33μF and large-value electrolytic
capacitor in parallel. These capacitors must be as close to the V+ and GND pins as possible. Place the
0.33μF capacitor within 0.2 in. (5mm) of the MAX887.
7
LX
Inductor Connection to the drain of an internal P-channel MOSFET
6
SYNC
Oscillator Synchronization and PWM Control Input. SYNC is a logic-level input. Tie SYNC to VL for internal
300kHz PWM operation at all loads. The oscillator synchronizes to the negative edge of an external clock
between 10kHz and 400kHz. The MAX887 operates in PWM mode when SYNC is clocked. Tying SYNC to
GND allows a reduced supply-current mode at light loads.
5
GND
Ground
PFM CURRENT COMPARATOR
LEVEL
SHIFTER
CONTROL &
DRIVER LOGIC
SLOPE COMPENSATION
FROM CONTROL LOGIC
PWM
COMPARATOR
NEGLIM
COMPARATOR
0mV in PFM
ADJ. IN PWM
GND
0.1X
SENSE FET
SENSE FET
1
LX
V+
0.1X
1
PWM
REF
FB
SYNC
PFM
COMPARATOR
OVERVOLTAGE
COMPARATOR
PWM ON
SIGNAL
50mV
FB
REF
REF
FB
25mV
100mV
RAMP
GEN
SYNC
CELL
ILIM COMPARATOR
REF
VL
V+
GND
REF
GND
SHDN
VL
Figure 1. Simplified Functional Block Diagram
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8873REUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873REUK+T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873REUK-T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873SEUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873SEUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.25V TO 6.5V/2.84V 0.12A 5PIN SOT-23 - Rail/Tube |
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