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| 型号： | MAX1587 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones |
| 中文描述： | 高效率，低智商与动态的PDA和智能手机PMIC的核心 |
| 文件页数： | 18/32页 |
| 文件大小： | 656K |
| 代理商： | MAX1587 |
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M
High-Efficiency, Low-I
Q
PMICs with
Dynamic Core for PDAs and Smart Phones
18
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Detailed Description
The MAX1586/MAX1587 power-management ICs are
optimized for devices using Intel X-Scale microproces-
sors, including third-generation smart cell phones,
PDAs, internet appliances, and other portable devices
requiring substantial computing and multimedia
capability at low power. The MAX1586A/MAX1586B/
MAX1587A comply with Intel Processor Power
specifications.
The ICs integrate seven high-performance, low-operat-
ing-current power supplies along with supervisory and
management functions. Regulator outputs include three
step-down DC-DC outputs (V1, V2, and V3), three lin-
ear regulators (V4, V5, and V6), and one always-on out-
put, V7 (Intel VCC_BATT). The V1 step-down DC-DC
converter provides 3.0V, 3.3V, or adjustable output volt-
age for I/O and peripherals. The V2 step-down DC-DC
converter on the MAX1586A and MAX1587A is preset
for 1.8V or 2.5V, while the MAX1586B V2 supply is pre-
set for 3.3V or 2.5V. V2 can also be adjusted with exter-
nal resistors on all parts. The V3 step-down DC-DC
converter provides a serial-programmed output for
powering microprocessor cores. The three linear regu-
lators (V4, V5, and V6) provide power for PLL, SRAM,
and USIM.
To minimize sleep-state quiescent current, V1 and V2
have bypass “sleep” LDOs that can be activated to
minimize battery drain when output current is very low.
Other functions include separate on/off control for all
DC-DC converters, low-battery and dead-battery
detection, a power-OK output, a backup-battery input,
and a two-wire serial interface.
All DC-DC outputs use fast, 1MHz PWM switching and
small external components. They operate with fixed-fre-
quency PWM control and automatically switch from
PWM to skip-mode operation at light loads to reduce
operating current and extend battery life. The V3 core
output is capable of forced-PWM operation at all loads.
The 2.6V to 5.5V input voltage range allows 1-cell Li+,
3-cell NiMH, or a regulated 5V input.
The following power-supply descriptions include the
Intel terms for the various voltages in parenthesis. For
example, the MAX1586/MAX1587 V1 output is referred
to as VCC_IO in Intel documentation. See Figure 1.
V1 and V2 (VCC_IO, VCC_MEM)
Step-Down DC-DC Converters
V1 is a 1MHz current-mode step-down converter. The V1
output voltage can be preset to 3.3V or adjusted using a
resistor voltage-divider. V1 supplies loads up to 1300mA.
V2 is also a 1MHz current-mode step-down converter.
The V2 step-down DC-DC converter on the MAX1586A
and MAX1587A is preset for 1.8V or 2.5V, while the
MAX1586B V2 supply is preset for 3.3V or 2.5V. V2 can
also be adjusted with external resistors on all parts. V2
supplies loads up to 900mA.
Under moderate to heavy loading, the converters operate
in a low-noise PWM mode with constant frequency and
modulated pulse width. Switching harmonics generated
by fixed-frequency operation are consistent and easily fil-
tered. Efficiency is enhanced under light loading (<30mA
typ), by assuming an Idle Mode
during which the con-
verter switches only as needed to service the load.
Synchronous Rectification
Internal N-channel synchronous rectifiers eliminate the
need for external Schottky diodes and improve efficien-
cy. The synchronous rectifier turns on during the sec-
ond half of each cycle (off-time). During this time, the
voltage across the inductor is reversed, and the induc-
tor current falls. In normal operation (not forced PWM),
the synchronous rectifier turns off at the end of the
cycle (at which time another on-time begins) or when
the inductor current approaches zero.
100% Duty-Cycle Operation
If the inductor current does not rise sufficiently to sup-
ply the load during the on-time, the switch remains on,
allowing operation up to 100% duty cycle. This allows
the output voltage to maintain regulation while the input
voltage approaches the regulation voltage. Dropout
voltage is approximately 180mV for an 800mA load on
V1 and 220mV for an 800mA load on V2. During
dropout, the high-side P-channel MOSFET turns on,
and the controller enters a low-current-consumption
mode. The device remains in this mode until the regula-
tor channel is no longer in dropout.
Sleep LDOs
In addition to the high-efficiency step-down converters,
V1 and V2 can also be supplied with low-quiescent cur-
rent, low-dropout (LDO) linear regulators that can be
used in sleep mode or at any time when the load current
is very low. The sleep LDOs can source up to 35mA. To
Idle Mode is a trademark of Maxim Integrated Products, Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1587AETL | High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones |
| MAX1586BETM | High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones |
| MAX1589A | Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN |
| MAX1589AETT | Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN |
| MAX1589AEZT | Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1587AETL | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs 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 |
| MAX1587AETL+ | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs 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 |
| MAX1587AETL+T | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs 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 |
| MAX1587AETL-T | 功能描述:直流/直流开关调节器 PMICs w/Dynamic Core for PDAs 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 |
| MAX1587AEVKIT | 功能描述:直流/直流开关转换器 MAX1587A Evaluation Kit/Evaluation System RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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