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| 型号： | MAX1587AETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/30页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGEMENT 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 电源电压： | 2.6 V ~ 5.5 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（6x6） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Low-I Q PMICs with
Dynamic Core for PDAs and Smart Phones
Voltage Monitors, Reset, and
Undervoltage-Lockout Functions
Undervoltage Lockout
IN
When the input voltage is below 2.35V (typ), an under-
100k Ω
MAX1586
voltage-lockout (UVLO) circuit disables the IC. The
inputs remain high impedance while in UVLO, reducing
battery load under this condition. All serial registers are
0.22 μ F
MR
MAX1587
maintained with the input voltage down to at least 2.35V.
Reset Output (RSO) and MR Input
The reset output ( RSO ) is low when the MR input is low
or when V7 is below 2.425V. V7 is powered from V1
(when enabled) or the backup-battery input (BKBT).
RSO normally goes low:
Figure 2. An RC delay connected from IN to MR ensures that
the 65ms RSO release delay remains in effect for any
sequence of V IN and V7.
1) When power is first applied in configurations with no
separate backup battery (external diode from IN to
BKBT).
2) When power is removed in configurations with no
separate backup battery (external diode from IN to
BKBT).
3) If the backup battery falls below 2.425V when V1 is
off or out of regulation.
MAIN BATTERY
R1
438k Ω
R2
62k Ω
IN
MAX1586
DBI (1.232V THRESHOLD)
LBI (1.00V THRESHOLD)
4) When the manual reset button is pressed ( MR goes
low).
If V IN is > 2.4V, an internal timer delays the release of
RSO for 65ms after V7 rises above 2.3V. However, if V IN
< 2.4V when V7 exceeds 2.3V, or if V IN and V7 rise at the
same time, RSO deasserts immediately with no 65ms
delay. There is no delay in the second case because the
timer circuitry is deactivated to minimize operating cur-
rent during V IN undervoltage lockout.
If it is desired to have a 65ms RSO release delay for any
sequence of V IN and V7, the circuit in Figure 2 may be
used. An RC connected from IN to MR delays the rise of
MR until after V IN powers up. The 65ms timer is valid for
either sequence of V7 and V IN and does not release until
65ms after both are up. The only regulator output that
affects RSO is V7. RSO will not respond to V1–V6, which
are monitored by POK. Also, RSO is high impedance
and does not function if BKBT is not powered.
MR is a manual reset input for hardware reset. A low
input at MR causes the RSO output to go low for at least
R3
200k Ω
Figure 3. Setting the Low-Battery and Dead-Battery Thresholds
with One Resistor Chain. The values shown set a DBI threshold
of 3.3V and an LBI threshold of 3.5V (no resistors are needed
for the factory preset thresholds).
(V IN ) discharges to the dead-battery threshold. The
factory-set 3.15V threshold is selected by connecting
DBI to IN, or the threshold can be programmed with a
resistor-divider at DBI. The low-battery comparator has
a factory-set 3.6V threshold that is selected by connect-
ing LBI to IN, or its threshold can be programmed with a
resistor-divider at LBI.
One three-resistor-divider can set both DBI and LBI
(R1, R2, and R3 in Figure 3) according to the following
equations:
1) Choose R3 to be less than 250k Ω.
? 1 ? V
V LBITH ?
DB ?
65ms and also resets the V3 output to its default 1.3V set-
ting. MR impacts no other MAX1586/MAX1587 functions.
2 )
R 1 = R 3
V LB ? V DBITH ?
?
Dead-Battery and Low-Battery Comparators—
R 2 = R 3 × ?
? 1 ?
DBI, LBI (MAX1586 Only)
The DBI and LBI inputs monitor input power (usually a
battery) and trigger the DBO and LBO outputs. The
3 )
?
?
V DBITH
V LBITH
V LB
V DB
?
?
dead-battery comparator triggers DBO when the battery
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1587AEVSYS | 功能描述:直流/直流开关转换器 High-Efficiency Low-IQ PMICs with Dynamic Core for PDAs and Smartphones 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 |
| MAX1587CETL | 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 |
| MAX1587CETL+ | 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 |
| MAX1587CETL+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 |
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