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參數(shù)資料
| 型號(hào)： | MAX847EEI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-Cell, Step-Up Two-Way Pager System IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO28 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-28 |
| 文件頁(yè)數(shù)： | 12/18頁(yè) |
| 文件大?。?/td> | 167K |
| 代理商： | MAX847EEI |
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M
pulse width modulation (PWM), as well as synchroniza-
tion, to minimize noise.
Some MAX847 functions are confined to Run Mode
while others remain active in both Run and Coast.
These are outlined as follows.
Various circuit functions can be disabled as follows:
Functions that always remain on are:
Serial I/O
Reference (REF)
OUT
REG1
LBI, RSIN (and LBO, RSO)
Functions that can be programmed on or off are (Table 1):
DR1 and DR2
REG2 and REG3
NICD charger (Note: This may overload OUT if
turned on in Coast Mode when other loads are
present)
NICD backup regulator
CH0, CH1, CH2 and CH DAC
Functions that always turn off in Coast Mode are:
SYNC and PLL circuits
DC-DC PWM control circuits
Power-On Reset
The MAX847 has an internal POR circuit (V
OUT
< 1.6V)
to ensure an orderly power-up when a battery is first
applied. This feature is separate from the RSO com-
parator; however, if RSO goes low during operation, all
serial registers are set to the same predetermined
states as on power-up. The POR states for each regis-
ter are listed in Table 3.
Note that the MAX847 always comes out of reset in
Coast Mode; consequently, it cannot supply full power
until Run Mode is selected by either the RUN pin or ser-
ial command. System software cannot exercise full load
current until Run Mode is enabled.
Charger Circ uit
A charger current source from OUT to NICD is activat-
ed via a serial bit (Table 2). The current source can
charge a small 3-cell NICD or NIMH battery (typically
coin cell) or a 1-cell lithium battery. The charge current
can be set to either 15mA or 1mA. When both 15mA
and 1mA are set, the charger runs at 15mA. OUT sets
the maximum charge (or float) voltage. When charging
is implemented, V
OUT
must also be set high enough to
allow sufficient headroom for the charger current
source. The V
OUT
- V
NICD
difference should normally
be between 0.2V and 0.5V. Charger current vs. output
voltage is graphed in the Typical Operating
Characteristics. Note also that charging current
reduces the OUT current available for other loads.
1-Cell, S tep-Up
Two-Way Pager S ystem IC
12
______________________________________________________________________________________
R2 (MSB)
R0
D3
D1
0
0
DR1_ON
REG2_ON
0
1
LBO_Sets_
BACKUP
15mA_CHG
0
0
1
0
1
OV3
X
DAC3
OV1
X
DAC1
Table 2. Serial-Bit Assignments
R1
0
0
1
1
D4
DR2_ON
X
OV4
X
DAC4
D2
D0
RUN/
COAST
1mA_CHG
OV0
X
DAC0
REG3_ON
BACKUP
OV2
X
DAC2
DAC5
DAC6
Table 3. Serial-Bit Power-On-Reset (POR) States
R2
0
0
0
0
1
R0
0
1
0
1
D3
D1
POR = 0
POR = 0
POR = 1
X
POR = 0
POR = 0
POR = 0
POR = 0
X
POR = 0
R1
0
0
1
1
D4
POR = 0
X
POR = 0
X
POR = 0
D2
D0
POR = 0
POR = 0
POR = 0
X
POR = 0
POR = 0
POR = 0
POR = 1
X
POR = 0
POR = 0
POR = 0
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| MAX849ESE | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX847EEI+ | 功能描述:電池管理 1 Cell Step-Up 2-Way Pager System IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX847EEI+T | 功能描述:電池管理 1 Cell Step-Up 2-Way Pager System IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX847EEI-C70955 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX847EEI-T | 功能描述:電池管理 1 Cell Step-Up 2-Way Pager System IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX847EVKIT | 制造商:Maxim Integrated Products 功能描述:1-CELL STEP-UP TWO-WAY PAGER SYSTE - Rail/Tube |
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