- 您现在的位置：买卖IC网 > PDF目录5055 > MAX1820XEUB+ (Maxim Integrated Products)IC REG BUCK WCDMA 10-MSOP PDF资料下载
参数资料
| 型号： | MAX1820XEUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK WCDMA 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 转换器，WCDMA 功率放大器应用 |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.4 V ~ 3.4 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
WCDMA Cellular Phone 600mA
Buck Regulators
Pin Description (continued)
PIN
MAX1820
UCSP
MAX1820
μMAX
MAX1821
UCSP
MAX1821
μMAX
NAME
FUNCTION
Output Feedback Sense Input. To set the output voltage,
—
—
A3
3
FB
connect FB to the center of an external resistive divider between
the output and GND. FB voltage regulates to 1.25V.
External Reference Input. Connect REF to the output of a D/A
A4
4
—
—
REF
converter for dynamic adjustment of the output voltage. REF-to-
OUT gain is 1.76.
—
B4
C4
C3
C2
C1
—
5
6
7
8
9
A4
B4
C4
C3
C2
C1
4
5
6
7
8
9
REF
GND
PGND
LX
BATT
SHDN
Internal Reference Bypass. Connect a 0.047μF capacitor from
REF to GND.
Ground
Power Ground
Inductor Connection. LX connects to the drains of the internal
power MOSFETs. LX is high impedance in shutdown mode.
Supply Voltage Input. Connect BATT to a 2.6V to 5.5V source.
Bypass BATT to PGND with a low-ESR 10μF capacitor.
Active-Low, Shutdown Control Input
Clock Synchronization Input. Drive SYNC with a 13MHz
(MAX1820X, MAX1821X) or 19.8MHz (MAX1820Y) AC-coupled
sine-wave input to synchronize power switching at 1MHz.
B1
10
B1
10
SYNC
MAX1820Z and MAX1821 do not have SYNC capability.
Connect SYNC to GND to use the internally generated,
free-running 1MHz clock. MAX1820Z and MAX1821 SYNC pin
must be connected to GND.
_______________Detailed Description
The MAX1820/MAX1821 PWM step-down DC-DC con-
verters are optimized for low-voltage, battery-powered
applications where high efficiency and small size are
priorities. The MAX1821 is a general-purpose device
that uses external feedback resistors to set the output
voltage from 1.25V to V BATT , and the MAX1820 is
specifically intended to power a linear PA in WCDMA
handsets. An analog control signal dynamically adjusts
the MAX1820’s output voltage from 0.4V to 3.4V with a
settling time <30μs.
The MAX1820/MAX1821 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
battery life. An additional forced PWM mode (with
optional external synchronization) switches at a con-
stant 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
shutdown mode.
PWM Control
The MAX1820/MAX1821 use a slope-compensated,
current-mode PWM controller capable of achieving
100% duty cycle. The current-mode control design is
capable of minimum duty cycles of less than 10%,
ensuring a constant switching frequency with outputs
as low as 0.4V when powered from a single lithium-ion
(Li+) cell. Current-mode feedback provides stable
switching and cycle-by-cycle current limiting for superi-
or load and line response and protection of the internal
MOSFET and synchronous rectifier. The output voltage
is regulated by switching at a constant frequency and
then modulating the power transferred to the load dur-
_______________________________________________________________________________________
9
相关PDF资料 |
PDF描述 |
|---|---|
| EBA40DTKT | CONN EDGECARD 80POS DIP .125 SLD |
| P1330-223K | INDUCTOR POWER 22.0UH SMD |
| X5649S14-2.7 | IC SUPERVISOR CPU 64K EE 14-SOIC |
| EEV-HD1E470P | CAP ALUM 47UF 25V 20% SMD |
| ECA43DTKN | CONN EDGECARD 86POS DIP .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1820XEUB+ | 功能描述:直流/直流开关调节器 WCDMA 600mA Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1820XEUB+T | 功能描述:直流/直流开关调节器 WCDMA 600mA Buck Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1820XEUB-T | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1820YEBC | 制造商:Maxim Integrated Products 功能描述:WCDMA CELLULAR PHONE 600MA BUCK REG - Rail/Tube |
| MAX1820YEBC+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 12UCSP - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。