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參數(shù)資料
| 型號： | MAX4919BETD+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 18/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTLR OVP/OCP BATT PWR 14-TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 過壓和過流控制器 |
| 應(yīng)用： | 手機，數(shù)碼相機，媒體播放器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 14-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
MAX4919B/MAX4920B/MAX4921B
GN1 Driver
An internal 5.5V supply powers the on-chip charge
pump used to drive GN1 above IN, allowing the use of
a low-cost nFET. The GN1 voltage is approximately two
times VIN until VIN exceeds 5.5V, at which point, GN1
clamps to 9.5V (MAX4919B/MAX4920B) or 8.1V
(MAX4921B).
ACOK
ACOK is an active-low open-drain output that asserts
when VUVLO <VIN < VOVLO for the 25ms debounce
period. ACOK deasserts immediately to overvoltage
and undervoltage faults. Connect a pullup resistor from
ACOK to the logic I/O voltage of the host system.
PWR_ON
PWR_ON is one of the logic inputs that enables the
internal 1.8A switch. Drive PWR_ON high to turn on the
internal switch. PWR_ON also controls the logic output
ONOK. The ONOK open-drain output is the inverse of
the PWR_ON input state (see Figure 5). Note that
ONOK is high impedance when VIN < VUVLO, and VBTI
< 2.82V (typ). If VBTI is greater than 2.15V (typ), but
less than 2.82V (typ), PWR_ON and ONOK are dis-
abled and ONOK pulls high. When BTI rises above
2.82V (typ) again, PWR_ON is again enabled and
ONOK goes back to its previous logic level before a
low condition at BTI (see Figure 6).
Battery Switchover
An internal 1.8A (min) pFET with a 100m
(typ) RON
connects BTI to the load at BTO. The internal battery
switchover FET turns on when either HP_PWR,
PWR_ON, or PWR_HOLD is high. Note that when BTI
< 2.15V, the internal switch remains inactive, regard-
less of the logic control signals.
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
8
_______________________________________________________________________________________
UVLO
OVLO
IN
ACOK
ADAPTER
VOLTAGE
ACOK
ONE-SHOT
P2
STATUS
OFF
ON
25ms DEBOUNCE PERIOD
OFF
t1SHAC
Figure 1. ACOK One-Shot Timing Diagram
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| MAX491C/D | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX491C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX491CPD | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX491CPD+ | 功能描述:RS-422/RS-485 接口 IC RS-485/RS-422 Transceiver RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX491CSD | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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