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參數(shù)資料
| 型號(hào)： | MAX781 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | PDA/Hand-Held Computer Power Controller |
| 中文描述： | PDA手持計(jì)算機(jī)電源控制器 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 185K |
| 代理商： | MAX781 |
M
PDA/Hand-Held Computer Power Controller
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13
The 3VSTAT comparator is disabled in the low-power,
standby, and shutdown modes, and outputs a logic
zero regardless of the state of its inputs. The MAX781
serial-interface outputs are powered from 3OUT. If
3OUT is short circuited to ground, then neither DOUT
nor INT will be able to source current.
CHGINT and CHGSTAT indicate the status of the
charging voltage applied to VCHG. The MAX781 pow-
ers itself from either BATT or VCHG, whichever has the
higher voltage. CHGSTAT = 0 when BATT is approxi-
mately 200mV greater than VCHG. CHGSTAT = 1
when BATT falls below VCHG plus approximately
200mV. Any transition on CHGSTAT sets CHGINT.
The CHGSTAT comparator is disabled only in shut-
down mode.
At power-up, BATTINT is set if the charger is not con-
nected, CHGINT is set if the charger is connected.
The INT pin outputs the logical OR of the BATTINT,
3VINT, and CHGINT status bits. The INT pin generates
an interrupt on the CPU that controls the MAX781.
S upply and Referenc e
5OUT outputs +5V, linear regulated from either BATT or
VCHG, in all modes except shutdown. 5OUT can
source up to 25mA. Power comes from BATT as long
as the BATT voltage is greater than the VCHG voltage.
When the VCHG voltage exceeds BATT, VCHG sup-
plies the 5OUT linear regulator.
The MAX781’s internal circuitry is powered from 5OUT.
When the DLO pin drives high, it sources current from
5OUT. The DOUT and INT pin output drivers are pow-
ered from 3OUT. If an external 5V supply is available
and connected to the 5OUT pin, the 5OUT linear regu-
lator can be disabled by clearing the 5ON bit. If 5ON is
cleared without an external +5V supply connected to
5OUT, or if 5OUT is shorted to ground, the MAX781
internal registers will be cleared to their power-on state.
3.3V Output
3OUT outputs +3.3V in all modes except for shutdown.
In low-power and standby modes, 3OUT is linear regu-
lated from either BATT or VCHG, whichever has the
higher voltage. In operate mode, the switch-mode
buck (step-down) converter is activated to regulate
3OUT to 3.3V. In operate mode, the 3OUT linear regu-
lator is off.
Table 4. Status Detection in the Four Operating
Modes
CLR
WRITING A "1" TOBATTINT
CLEARS THE FLIP FLOP
COMPARATOR DISABLED IN
LOW-POWER MODE; OUTPUTS "0"
REGARDLESS OF STATE OF INPUTS
D
>
>
BATTINT
BATTSTAT
402k
14.1k
BATT
3OUT
BATT+
BATTERY
PACK
THERM
BATT-
R4
1
μ
F
TEMP
AGND,
PGND
83k
R8
R
TEMP
TOANALOG MULTIPLEXER
Q
MAX781
T
Figure 6. BATTINT, BATTSTAT Status Circuitry
BATTSTAT
3VSTAT
CHGSTAT
Disabled
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
STATUS
BIT
Shutdown
Low
Power
Standby
Operate
MODE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX781CBX | PDA/Hand-Held Computer Power Controller |
| MAX781EBX | PDA/Hand-Held Computer Power Controller |
| MAX783 | Triple-Output Power-Supply Controller for Notebook Computers(3.3V/5V,具有雙組PCMCIA標(biāo)準(zhǔn)VPP輸出的筆記本電腦電源控制器) |
| MAX786 | Dual-Output Power-Supply Controller for Notebook Computers(具有25μA關(guān)斷的,3.3V/5V筆記本型電腦電源) |
| MAX787 | 5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators(5A,5V步降,PWM,開關(guān)型DC-DC變換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX781CBX | 制造商:Maxim Integrated Products 功能描述: |
| MAX7828BQ | 制造商:Maxim Integrated Products 功能描述:NON BOOK, REQUIRES NCNR, Q# - Rail/Tube |
| MAX7828UQ/883B | 制造商:Maxim Integrated Products 功能描述:NON BOOK, REQUIRES NCNR, Q# - Rail/Tube |
| MAX782C/D | 功能描述:DC/DC 開關(guān)控制器 Triple-Output Power-Supply Controller for Notebook Computers RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX782C/D+ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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