データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

ADM1072ARQ データシート(PDF) 7 Page - Analog Devices

部品番号 ADM1072ARQ
部品情報  Dual, USB 2.0 Full/Standby Power Controller with Supply Steering
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADM1072ARQ データシート(HTML) 7 Page - Analog Devices

  ADM1072ARQ Datasheet HTML 1Page - Analog Devices ADM1072ARQ Datasheet HTML 2Page - Analog Devices ADM1072ARQ Datasheet HTML 3Page - Analog Devices ADM1072ARQ Datasheet HTML 4Page - Analog Devices ADM1072ARQ Datasheet HTML 5Page - Analog Devices ADM1072ARQ Datasheet HTML 6Page - Analog Devices ADM1072ARQ Datasheet HTML 7Page - Analog Devices ADM1072ARQ Datasheet HTML 8Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 7 / 8 page
background image
ADM1072
–7–
Rev. PrE 1/02
FUNCTIONAL DESCRIPTION
The ADM1072 is a dual, logic-controlled P-channel switch.
Each channel of the ADM1072 comprises two P-channel
switches. The source of one switch is connected to the
“MAIN_IN” input pins and can switch up to 1A. The second
switch is conected to the “STBY_IN” pins and can switch up to
200mA. The device is rated to provide 500mA continuously in
full power mode and 100mA continuously in STBY mode. The
STBY_IN inputs also provide the power for the chip circuitry
and so must be connected to a supply at all times.
When STBY is low the MAIN switch is active and when STBY
is high the Standby switch is active.
Each channel is individually controlled by an active-low logic
input
ON1 (pin 11) and ON2 (pin 10). When either ON1 or
ON2 is low, the internal circuitry of the ADM1072 is powered
up and the output of the corresponding current-limit amplifier
is low, providing gate drive to the switching FET, thus turning
it on. When both
ON inputs are high, the internal circuitry is
powered down and the current consumption is typically 10nA.
It should be noted that the ADM1072 is not a bi-directional
switch, so VIN must always be higher than VOUT.
TABLE 1. Truth Table for
ON1, ON2 and STBY
ON1
ON2
STBY
Channel 1
Channel 2
0
0
0
500mA
500mA
0
0
1
100mA
100mA
0
1
0
500mA
OFF
0
1
1
100mA
OFF
1
0
0
OFF
500mA
1
0
1
OFF
100mA
1
1
X
BOTH SHUT DOWN
X = don’t care
CURRENT LIMIT
When either the Main or Standby switch is turned on a smaller
mirror switch passes a proportionate current equal to IOUT/
1000. The mirror amplifier maintains this relationship by
keeping the drain of the mirror FET at the same voltage as the
main FET, and drives the mirror current through an internal
current-limit resistor, which is connected between the non-
inverting input of the current limit amplifier and ground. An
on-chip bandgap reference of 1.24V is connected to the
inverting input of the current-limit amplifier. When the load
current exceeds the preset limit, the voltage across the current-
limit resistor exceeds 1.24V and the output voltage of the cur-
rent-limit amplifier rises, reducing the gate drive to the FETs.
By selecting between the Standby and Main FETs and their
associated mirror FETs, the STBY input allows the two differ-
ent values of current limit specified by USB2.0 to be selected.
This feature is particularly useful when driving USB peripherals
from a host system such as a PC that can go into a power-
saving mode, since it limits the current that the peripherals can
attempt to draw from the host power supply.
SHORT-CIRCUIT PROTECTION
The proportional relationship between the main FET and the
mirror FET is only maintained down to an output voltage of
about 1.6V. Below this voltage the output current is limited to
approximately 1.2 x ILIMIT.
In the event of a high dV/dt across the switching FET during a
short-circuit, the switch will turn off and disconnect the input
from the output. The switch is then turned on slowly with the
current limited to the short-circuit value.
THERMAL SHUTDOWN
The thermal shutdown operates when the die temperature
exceeds +150
oC, turning off both channels. The thermal shut-
down circuit has built-in hysteresis of 10
oC, so the switch will
not turn on again until the die temperature falls to +140
oC. If
the fault condition is not removed, the switch will pulse on and
off as the temperature cycles between these limits.
UNDERVOLTAGE LOCKOUT
The undervoltage sensor monitors the input supply voltage (ie)
the voltage on STBY_IN. The outputs will not turn on until
the supply voltage is sufficient for the chip circuits to operate
reliably. Undervoltage lockout occurs at between 2.0 and 2.6V.
FLT OUTPUTS
The ADM1072 has active-low fault outputs for each channel,
FLT1 (pin 6) and FLT2 (pin 7). If the current limit is
exceeded for greater than 10mS, the corresponding
FLT
output will pull low. If the thermal shutdown is activated, both
FLT outputs will pull low. The FLT outputs are open-drain
and require a pullup resistor of between 10k
and 100k .
Several
FLT outputs may be wire-OR’d to form a common
interrupt line, as shown in Figure 17 or
FLT outputs may be
wire-OR’d to an existing interrupt line that has a resistive pullup.
AD M 1 072
FLT1
FLT2
RPULL UP
V PULLUP
IN T
AD M 1 072
FLT1
FLT2
AD M 1072
FLT1
FLT2
Figure 17. Wire Or’ing FAULT Outputs
During startup, the FLT output goes low for the turn-on time.


同様の部品番号 - ADM1072ARQ

メーカー部品番号データシート部品情報
logo
Analog Devices
ADM1072 AD-ADM1072_15 Datasheet
86Kb / 8P
   Dual, USB 2.0 Full/Standby Power Controller with Supply Steering
Rev. PrE 1/02
More results

同様の説明 - ADM1072ARQ

メーカー部品番号データシート部品情報
logo
Analog Devices
ADM1072 AD-ADM1072_15 Datasheet
86Kb / 8P
   Dual, USB 2.0 Full/Standby Power Controller with Supply Steering
Rev. PrE 1/02
logo
Intersil Corporation
ISL6119 INTERSIL-ISL6119 Datasheet
491Kb / 13P
   USB Dual Port Power Supply Controller
logo
Renesas Technology Corp
ISL6185 RENESAS-ISL6185 Datasheet
945Kb / 20P
   Dual USB Port Power Supply Controller
ISL6436 RENESAS-ISL6436 Datasheet
796Kb / 13P
   USB Dual Port Power Supply Controller
Aug 10, 2001
logo
Intersil Corporation
ISL6119LIB INTERSIL-ISL6119LIB Datasheet
494Kb / 13P
   USB Dual Port Power Supply Controller
March 2004
ISL6185 INTERSIL-ISL6185 Datasheet
400Kb / 20P
   Dual USB Port Power Supply Controller
logo
Renesas Technology Corp
ISL6119 RENESAS-ISL6119 Datasheet
771Kb / 13P
   USB Dual Port Power Supply Controller
logo
Intersil Corporation
ISL6436 INTERSIL-ISL6436 Datasheet
902Kb / 12P
   USB Dual Port Power Supply Controller
ISL61851ACBZ INTERSIL-ISL61851ACBZ Datasheet
780Kb / 20P
   Dual USB Port Power Supply Controller
March 8, 2012
logo
List of Unclassifed Man...
TE7022SL ETC2-TE7022SL Datasheet
313Kb / 5P
   USB 2.0 Full-Speed Hi-Q USB Audio Streaming Controller
More results


Html Pages

1 2 3 4 5 6 7 8


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com