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参数资料
| 型号： | ADM1051AJRZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 7/10页 |
| 文件大小： | 176K |
| 代理商： | ADM1051AJRZ |
REV. 0
ADM1051/ADM1051A
–7–
For compatibility with the TYPEDET signal, the regulator output
voltage of Channel 1 may be selected using the Shutdown pin.
This is a multilevel, dual-function input that allows selection of
the regulator output voltage as well as shutdown of the regulator.
By setting
SHDN1
to different voltages, the regulator can be put
into four different operating modes.
Table I. Shutdown Functionality for 1.5 V Channel
SHDN1
Voltage
Mode
Function
< 0.8 V
1
Force Output Low, Regulator
Shutdown
1.5 V Output
Force Output High, V
OUT
= 3.3 V
1.5 V Output
2 V–3.9 V
4.3 V–5.3 V
>6.2 V or Floating
2
3
4
If the
SHDN1
pin is connected to a voltage less than 0.8 V, the
FORCE output will go low and the regulator will be shut down.
If the
SHDN1
pin is connected to a voltage greater than 6.2 V,
or simply left open-circuit, the regulator will operate normally
and provide 1.5 V out. This allows the regulator to operate
normally with no external connection to
SHDN1
.
If the
SHDN1
pin is connected to a voltage between 2 V and 3.9 V,
the regulator will also operate normally and provide 1.5 V out.
If the
SHDN1
pin is connected to a voltage between 4.3 V and
5.3 V, the FORCE output will be high and the external MOSFET
will be turned hard on, making the output voltage equal to the 3.3 V
input (less any small drop due to the on-resistance of the MOSFET).
In this mode it is not actually regulating, but simply acting as a
switch for the 3.3 V supply. The voltage drop across the Channel 1
MOSFET in Mode 3 can be minimized by using a MOSFET
with very low on resistance, for which Channel 1 is optimized,
such as the PHD55N03LT.
The latter two modes allow the regulator to be controlled by the
TYPEDET signal simply by using potential divider, as shown in
Figure 2.
TYPEDET
SHDN1
PC 5V SUPPLY
3k
3k
Figure 2. Using
SHDN1
with TYPEDET Signal
A shutdown function can be added by connecting an open-drain/
open-collector logic output to
SHDN1
, or by using a totem-pole
logic output with a Schottky diode, as shown in Figure 3.
ADM1051/
ADM1051A
OPEN-DRAIN OR
OPEN-COLLECTOR
OUTPUT
TYPEDET
SHDN1
PC 5V SUPPLY
3k
3k
EN
TYPEDET
ADM1051/
ADM1051A
SHDN1
PC 5V SUPPLY
3k
3k
SCHOTTKY
DIODE
COMPLEMENTARY
OR TOTEM-POLE
OUTPUT
EN
Figure 3. TYPEDET Voltage Selection Combined with
Shutdown Function
When the logic output is high or turned off, the regulator mode
will be controlled by TYPEDET. When the logic output is low,
the regulator will be shut down.
Table II. TYPEDET and Shutdown Truth Table
TYPEDET
EN
Regulator Mode
X
0
1
0
1
1
Shutdown
1.5 V
3.3 V
X = Don’t care.
Note that when Channel 1 of the ADM1051 is set to 3.3 V,
Channel 2 should not be shut down while Channel 1 is active.
12V SUPPLY
V
REF
TURN-ON
POR THRESHOLD
4V
–
7V
GATE DRIVE TO
EXTERNAL
MOSFET
MOSFET GATE
THRESHOLD
3.3V SUPPLY
TO EXTERNAL
MOSFET DRAIN
CHANNEL 1
OR CHANNEL 2
OUTPUT VOLTAGE
NORMAL
OUTPUT VOLTAGE
FAULT
REMOVED
OUTPUT < 0.8 V
REG
CHANNEL 1
OR CHANNEL 2
OUTPUT CURRENT
HICCUP MODE
HOLD-OFF TIME
2 AMPS
DEVICE ENTERS HICCUP MODE
FAULT CURRENT
1:40 DUTY CYCLE
OFF
ON
Figure 4. Power-On Reset and Hiccup Mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1051AJRZ-REEL | 制造商:Analog Devices 功能描述:DC DC CNTRLR DUAL-OUT STEP DOWN 12V 8SOIC N - Tape and Reel |
| ADM1051AJRZ-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADM1051JR | 制造商:Analog Devices 功能描述:DC DC Cntrlr Dual-OUT Step Down 12V Input 8-Pin SOIC N 制造商:Analog Devices 功能描述:DC DC CNTRLR DUAL-OUT STEP DOWN 12V 8SOIC - Bulk 制造商:Rochester Electronics LLC 功能描述:DUAL BUS TERMINATOR - Bulk |
| ADM1051JR-REEL | 制造商:Analog Devices 功能描述:DC DC CNTRLR DUAL-OUT STEP DOWN 12V 8SOIC N - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:DUAL BUS TERMINATOR - Tape and Reel |
| ADM1051JR-REEL7 | 制造商:Analog Devices 功能描述:DC DC Cntrlr Dual-OUT Step Down 12V Input 8-Pin SOIC N T/R 制造商:Analog Devices 功能描述:DC DC CNTRLR DUAL-OUT STEP DOWN 12V 8SOIC N - Tape and Reel |
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