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参数资料
| 型号： | MAX8508ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV PWM 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，WCDMA |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 3.4 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
PWM Step-Down DC-DC Converters with 75m ?
Bypass FET for WCDMA and cdmaOne Handsets
Pin Description
PIN
MAX8506
MAX8507
1
2
3
4
5
MAX8508
1
2
3
—
5
NAME
SHDN
GND
REF
REFIN
COMP
FUNCTION
Shutdown Control Input. Drive low for shutdown mode. Connect to BATT or logic high to
enable the IC.
Ground. Connect to PGND and directly to EP.
Reference Output. Output of the internal 1.25V reference. Bypass to GND with a 0.22μF
capacitor.
External Reference Input. Connect to the output of a digital-to-analog converter for
dynamic adjustment of the output voltage.
Compensation. Connect a compensation network from COMP to GND to stabilize the
regulator. See the Typical Application Circuits .
High-Power Bypass Control Input. Drive low for OUT to regulate to the voltage set by
6
6
HP
REFIN (MAX8506/MAX8507) or the external resistors on FB (MAX8508). Drive HP high for
OUT to be connected to BATT by an internal bypass PFET.
7
8
9
10
11, 13, 15
12, 14
16
7
8
9
10
11, 13, 15
12, 14
16
N.C.
PGND
LX
BATTP
BATT
OUT
SKIP
No Connection. Connect to PGND.
Power Ground. Connect to GND.
Inductor Connection to the Drains of the Internal Power MOSFETs. LX is high impedance
in shutdown mode.
Supply Voltage Input. Connect to a 2.6V to 5.5V source. Bypass BATTP to PGND with a
low-ESR 2.2μF capacitor. Connect BATTP to BATT.
Supply Voltage Input. Connect all BATT pins to BATTP.
Regulator Output. Connect both OUT pins directly to the output voltage.
Skip Control Input. Connect to GND or drive low to enable pulse skipping under light
loads. Connect SKIP to BATT or logic high for forced-PWM mode.
Output Feedback Sense Input. To set the output voltage, connect FB to the center of an
—
4
FB
external resistive voltage-divider between OUT and GND. FB voltage regulates to 0.75V
when HP is low.
—
—
EP
Exposed Pad. Connect directly to GND underneath the IC.
Detailed Description
The MAX8506/MAX8507/MAX8508 PWM step-down DC-
DC converters with integrated bypass PFET are opti-
mized for low-voltage, battery-powered applications
where high efficiency and small size are priorities. An
analog control signal dynamically adjusts the MAX8506/
MAX8507s’ output voltage from 0.4V to 3.4V with a set-
tling time of 30μs. The MAX8508 uses external feedback
resistors to set the output voltage from 0.75V to 3.4V.
The MAX8506/MAX8507/MAX8508 operate at a high
1MHz switching frequency that reduces external com-
ponent size. Each device includes an internal synchro-
nous rectifier for high efficiency, which 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. A forced-PWM mode switches at a constant
frequency, regardless of load, to provide a well-con-
trolled spectrum in noise-sensitive applications. Battery
life is maximized by the low-dropout (75m ? ) high-
power mode and a 0.1μA (typ) logic-controlled shut-
down mode.
6
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