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參數(shù)資料
| 型號(hào)： | MAX859 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Upstream CATV Amplifier[MAX3509/MAX3509EUP/MAX3509EUP-T/MAX3509EVKIT] |
| 中文描述： | 3.3V/5V或可調(diào)輸出、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 296K |
| 代理商： | MAX859 |
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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
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX8502 | SWITCH |
| MAX8503 | PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets |
| MAX8504 | PWM Buck Converters with Bypass FET for N-CDMA/W-CDMA Handsets |
| MAX8504EVKIT | Evaluation Kit for the MAX8500/MAX8503/MAX8504 |
| MAX8505 | 3A. 1MHz. 1% Accurate. Internal Switch Step-Down Regulator with Power-OK |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8594AETG | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX8594AETG+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8594AETG-T | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX8594ETG | 功能描述:PMIC 解決方案 5-Output PMIC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX8594ETG+ | 功能描述:PMIC 解決方案 5-Output PMIC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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