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參數(shù)資料
| 型號： | MAX8500 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Hex Inverters With Open-Drain Outputs 14-CDIP -55 to 125 |
| 中文描述： | PWM buck轉換器，帶有旁路FET，適用于N-CDMA/W-CDMA手機 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 296K |
| 代理商： | MAX8500 |
M
PWM Buc k Converters with Bypass FET
for N-CDMA/W-CDMA Handsets
_______________________________________________________________________________________
7
Pin Desc ription
PIN
MAX8500–
MAX8503
MAX8504
NAME
FUNCTION
1
2
1
2
GND
REF
Ground
Reference Bypass Pin. Connect a 0.22μF ceramic capacitor from this pin to GND.
3
—
REFIN
External Reference Input. Connect REFIN to the output of a DA converter for dynamic
adjustment of the output voltage.
—
3
FB
Output Feedback Sense Input. To set the output voltage, connect FB to the center of an
external resistive voltage-divider between OUT and GND. FB voltage regulates to 1.25V
when HP is logic 0.
4
4
COMP
Compensation. Connect a series resistor and capacitor from this pin to GND to stabilize
the regulator (see the
Compensation, Stability, and Output Capacitor
section).
5, 9
9
BATT
IC Supply Voltage Input. Connect to BATTP.
—
5
HP
High-Power Bypass Mode. Connect to GND or logic 0 for OUT to regulate to the voltage
set by the external resistors on FB. Drive with logic 1 for OUT to be connected to BATT
through the internal bypass PFET.
6
6
PGND
Power Ground
7
7
LX
Inductor Connection to the Drains of the Internal Power MOSFETs. High impedance in
shutdown mode.
8
8
BATTP
Power-Supply Voltage Input. Connect to a 2.6V to 5.5V source. Bypass with a low-ESR
10μF capacitor.
10
10
OUT
Regulator Output. Connect OUT directly to the output voltage.
11
11
SKIP
Skip Control Input. Connect to GND or logic 0 for normal mode. Connect to BATT or logic
1 for forced-PWM mode.
12
12
SHDN
Shutdown Control Input. Connect to GND or logic 0 for shutdown mode. Connect to BATT
or logic 1 for normal operation.
Detailed Desc ription
The MAX8500
–
MAX8504 PWM step-down DC-to-DC
converters with integrated bypass PFET are optimized
for low-voltage, battery-powered applications where high
efficiency and small size are priorities (such as linear PA
applications). An analog control signal dynamically
adjusts the MAX8500
–
MAX8503s
’
output voltage from
0.4V to V
BATT
with a settling time <30μs (Figure 1). The
MAX8504 uses external feedback resistors to set the out-
put voltage from 1.25V to 2.5V.
The MAX8500
–
MAX8504 operate at a high 1MHz
switching frequency that reduces external component
size. Each device includes an internal synchronous rec-
tifier that provides for high efficiency and eliminates the
need for an external Schottky diode. The normal operat-
ing mode uses constant-frequency PWM switching at
medium and heavy loads, and automatically pulse skips
at light loads to reduce supply current and extend bat-
tery life. An additional forced-PWM mode switches at a
constant frequency, regardless of load, to provide a
well-controlled spectrum in noise-sensitive applications.
Battery life is maximized by low-dropout operation at
100% duty cycle and a 0.1μA (typ) logic-controlled shut-
down mode.
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參數(shù)描述 |
|---|---|
| MAX8500ETC | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| MAX8501ETC | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| MAX8501SA | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8502ETC | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| MAX8503ETC | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
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