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参数资料
| 型号： | MAX8660AETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/44页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGE XSCALE 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 处理器 |
| 电源电压： | 2.6 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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High-Efficiency, Low-I Q , PMICs with Dynamic
Voltage Management for Mobile Applications
EN2 is a dedicated enable input for REG2. Drive EN2
high to enable REG2 or drive EN2 low to disable REG2.
EN2 has hysteresis so that an RC may be used to
implement manual sequencing with respect to other
inputs. In systems based on Marvell PXA3xx, EN1,
EN2, and EN5 are typically connected to SYS_EN
(Table 2).
The REG2 step-down regulator operates in either nor-
mal or forced-PWM mode. See the REG1–REG4 Step-
Down DC-DC Converter Operating Modes section for
more information.
The REG2 regulator has an on-chip synchronous rectifier.
See the REG1–REG4 Synchronous Rectification section
for more information.
The REG2 regulator allows 100% duty-cycle operation.
See the REG1/REG2 100% Duty-Cycle Operation
(Dropout) section for more information.
REG3 (VCC_APPS) Step-Down DC-DC Converters
REG3 is a high-efficiency (REG3 + REG8 I Q = 45μA)
2MHz current-mode step-down converter that has an
I 2 C-adjustable output voltage from 0.725V to 1.800V in
25mV increments with efficiency up to 92%. The default
REG3 output voltage is 1.4V for the MAX8660/
MAX8660A/MAX8661, and 1.15V for the MAX8660B
(contact factory for other default voltages). REG3 deliv-
ers up to 1.6A. See the I 2 C Interface section for details
on how to adjust the output voltage.
REG3 has an I 2 C enable bit (EN3) and a shared hard-
ware enable pin (EN34). See the REG3/REG4 Enable
(EN34, EN3, EN4) section for more information.
The REG3 step-down regulator operates in either nor-
mal or forced-PWM mode. See the REG1–REG4 Step-
The REG4 step-down regulator operates in either nor-
mal or forced-PWM mode. See the REG1–REG4 Step-
Down DC-DC Converter Operating Modes section for
more information.
The REG4 regulator has an on-chip synchronous rectifier.
See the REG1–REG4 Synchronous Rectification section
for more information.
REG1–REG4 Step-Down
DC-DC Converter Operating Modes
REG1 –REG4 independently operate in one of two
modes: normal or forced PWM. At power-up or after a
reset, REG1–REG4 default to normal operation. Activate
forced-PWM mode by setting bits in the FPWM register
(Table 9) with the I 2 C interface. The FPWM bits can be
changed at any time.
In forced-PWM mode, a converter operates with a con-
stant 2MHz switching frequency regardless of output
load. The MAX8660/MAX8661 regulate the output volt-
age by modulating the switching duty cycle. Forced-
PWM mode is ideal for low-noise systems because
output voltage ripple is small (< 10mV P-P ) and switch-
ing harmonics occur at multiples of the constant-
switching frequency and are easily filtered. However,
light-load power consumption in forced-PWM mode is
higher than that of normal mode (Table 7).
Normal operation offers improved efficiency at light
loads by switching only as necessary to supply the
load. With moderate to heavy loading, the regulator
switches at a fixed 2MHz switching frequency as it
does in forced-PWM mode. This transition to fixed-fre-
quency switching occurs at the load current specified
in the following equation:
I OUT ? IN OUT x
Down DC-DC Converter Operating Modes section for
more information.
The REG3 regulator has an on-chip synchronous rectifier.
V ? V
2 xL
V OUT
V IN x f SW
See the REG1–REG4 Synchronous Rectification section
for more information.
REG4 (VCC_SRAM) Step-Down DC-DC Converters
REG4 is a high-efficiency (REG4 + REG8 I Q = 45μA)
2MHz current-mode step-down converter that has an
I 2 C-adjustable output voltage from 0.725V to 1.800V in
25mV increments with efficiency up to 92%. The default
REG4 output voltage is 1.4V for the MAX8660/
MAX8660A/MAX8661, and 1.15V for the MAX8660B
(contact factory for other default voltages). REG4 deliv-
ers up to 400mA. See the I 2 C Interface section for
details on how to adjust the output voltage.
REG4 has an I 2 C enable bit (EN4) and a shared hard-
ware enable pin (EN34). See the REG3/REG4 Enable
(EN34, EN3, EN4) section for more information.
REG1–REG4 Synchronous Rectification
Internal n-channel synchronous rectifiers eliminate the
need for external Schottky diodes and improve efficiency.
The synchronous rectifier turns on during the second
half of each switching cycle (off-time). During this time,
the voltage across the inductor is reversed, and the
inductor current ramps down. In PWM mode, the syn-
chronous rectifier turns off at the end of the switching
cycle. In normal mode, the synchronous rectifier turns
off when the inductor current falls below 25mA or at the
end of the switching cycle, whichever occurs first.
REG1/REG2 100% Duty-Cycle Operation (Dropout)
The REG1 and REG2 step-down DC-DC converters
operate with 100% duty cycle when the supply voltage
approaches the output voltage. This allows these
27
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8660AETL+ | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8660AETL+T | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8660BETL+ | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8660BETL+T | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8660ETL/V+ | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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