參數(shù)資料
型號(hào)： MAX847EEI
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 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)： 9/18頁(yè)
文件大?。?/td> 167K
代理商： MAX847EEI
______________ Detailed Desc ription
The MAX847 contains several functional blocks that
simplify the integration of power-supply and monitoring
functions within a 1-cell powered system. They are
described in the following subsections.
V oltage Regulators
Regulator outputs include the following:
OUT: Main switch-mode boost output
REG1: 1.5
switch and output voltage clamp. Switches
REG1 to OUT and clamps REG1 at 3.3V when OUT
is set to 3.4V or more.
REG2: Linear-regulated, 24mA low-noise output that
regulates so that V
OUT
- V
REG2
is a set difference
voltage (10μA
R
OFS
). Output peak-to-peak ripple is
typically 2mV with a 10μF bypass capacitor at REG2.
REG2 clamps output at 3.3V.
REG3: Low-noise, 1V linear regulator that supplies
2mA.
Main DC-DC Boost Converter (OUT)
OUT is the main DC-DC converter’s output. It supplies
current from the internal synchronous-rectified boost reg-
ulator and needs no external FETs or voltage-setting
resistors. The output voltage (V
OUT
) is adjusted from
1.8V to 4.9V in 100mV steps (Tables 2 and 6) by internal
DAC control using a serial-data command. OUT can
supply up to 80mA, less the current supplied to the other
regulators (REG1, REG2, and REG3).
OUT can also be put into a low-current, pulse-skipping
Coast Mode (13μA typical quiescent current) by reset-
ting the RUN/COAST serial input bit and holding the
RUN pin at 0V. OUT supplies up to 40mA in Coast
Mode. Typically, when changing from Run to Coast
Mode, a lower OUT voltage is also set (Table 5) to fur-
ther reduce system operating current. The extent of this
reduction depends on the minimum operating voltage
of the system components when they are in standby or
sleep states.
M
1-Cell, S tep-Up
Two-Way Pager S ystem IC
_______________________________________________________________________________________
9
MAX847
AA ALKALINE
BATT
26
1
11
6
9
27
5
2
3
25
4
24
22
14
21
20
10
7
23
15
3.0V LOGIC
R6
2.85V ANALOG
TORF PA
3-CELL
NiCd
R
OFS
15k
1V
RCVR
OUT
PGND
REG1
R2IN
OFS
REG2
L1
22
μ
H
MBRO52OL
C1
47
μ
F
C6
0.1
μ
F
CERAMIC
C2
10
μ
F
C3
10
μ
F
C4
1
μ
F
TO
μ
C RESET
R3
1.3M
R6
R4
470k
C7
C
OFS
0.1
μ
F
C10
1nF
C9
22nF
R7
10k
C8
0.1
μ
F
C5
22
μ
F
SERIAL
I/O
A/D IN
17
19
18
16
13
12
8
28
1.8
DRIVERS
38.4kHz
REG3
RSIN
RSO
NICD
AGND
RUN
LBI
R1
330k
R2
470k
R5
REG1
LBO
CH0
CS
SCL
SDI
SDO
DR1
DR2
DR2IN
DRGND
SYNC
FILT
REF
RUN
COAST
LX1
Figure 2. Standard Application Circuit
相關(guān)PDF資料
PDF描述
MAX847 Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125
MAX848-MAX849 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX849ESE 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX848ESE 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX848 Low-Noise, Step-Up DC-DC Converters(高功率，低噪，帶0.5AMOSFET功率開(kāi)關(guān),步升DC-DC變換器)
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(lèi)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(lèi)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(lèi)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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