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参数资料
| 型号： | ADM666 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | +5 V Fixed, Adjustable Micropower Linear Voltage Regulators(固定+5V输出或可调输出,低功耗线性稳压器) |
| 中文描述： | 5 V固定，可调微功耗线性稳压器（固定5V的输出或可调输出，低功耗线性稳压器） |
| 文件页数： | 3/6页 |
| 文件大小： | 103K |
| 代理商： | ADM666 |
ADM663/ADM666
REV. 0
–3–
DIP & SOIC PIN CONFIGURAT IONS
GE NE RAL INFORMAT ION
T he ADM663/ADM666 contains a micropower bandgap refer-
ence voltage source, an error amplifier A1, two comparators
C1, C2 and a series pass output transistor. A P-channel FET
and an NPN transistor are used on the ADM663 while the
ADM666 uses an NPN output transistor.
CIRCUIT DE SCRIPT ION
T he internal bandgap reference is trimmed to 1.3 V
±
30 mV.
T his is used as a reference input to the error amplifier A1. T he
feedback signal from the regulator output is supplied to the
other input by an on-chip voltage divider or by two external re-
sistors. When V
SET
is at ground, the internal divider provides
the error amplifier’s feedback signal giving a +5 V output. When
V
SET
is at more than 50 mV above ground, the error amplifier's
input is switched directly to the V
SET
pin, and external resistors
are used to set the output voltage. T he external resistors are
selected so that the desired output voltage gives 1.3 V at V
SET
.
Comparator C1 monitors the output current via the SENSE
input. T his input, referenced to V
OUT (2)
, monitors the voltage
drop across a load sense resistor. If the voltage drop exceeds
0.5 V, then the error amplifier A
1
is disabled and the output
current is limited.
T he ADM663 has an additional amplifier, A2, which provides a
temperature-proportional output, V
T C
. If this is summed into
the inverting input of the error amplifier, a negative temperature
coefficient results at the output. T his is useful when powering
liquid crystal displays over wide temperature ranges.
T he ADM666 has an additional comparator, C3 which com-
pares the voltage on the Low Battery Input, LBI, pin to the in-
ternal +1.3 V reference. T he output from the comparator drives
PIN FUNCT ION DE SCRIPT ION
Mnemonic
Function
V
OUT (1) (2)
V
IN
SENSE
Voltage Regulator Output(s)
Voltage Regulator Input
Current Limit Sense Input. (Referenced to
V
OUT (2).
) If not used it should be connected to
V
OUT (2)
Ground Pin. Must be connected to 0 V
Low Battery Detect Input. Compared with 1.3 V
Low Battery Detect Output. Open Drain Output
Digital Input. May be used to disable the device
so that the power consumption is minimized
Voltage Setting Input. Connect to GND for +5 V
output or connect to resistive divider for adjust
able output
T emperature-Proportional Voltage for negative
T C Output
GND
LBI
LBO
SHDN
V
SET
V
T C
an open drain FET connected to the Low Battery Output pin,
LBO. T he Low Battery T hreshold may be set using a suitable
voltage divider connected to LBI. When the voltage on LBI falls
below 1.3 V, the open drain output LBO is pulled low.
Both the ADM663 and the ADM666 contain a shutdown
(SHDN) input which can be used to disable the error amplifier
and hence the voltage output. T he quiescent current in shut-
down is less than 12
μ
A.
50mV
V
IN
ADM663
SHDN
GND
V
TC
V
SET
V
OUT1
V
OUT2
SENSE
1.3V
REF
C2
0.9V
0.5V
C1
A2
A1
Figure 1. ADM663 Functional Block Diagram
SENSE
V
OUT2
V
OUT1
GND
V
IN
V
TC
V
SET
SHDN
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADM663
SENSE
V
OUT
LBI
GND
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADM666
V
IN
LBO
V
SET
SHDN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM666A | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AAN | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AAR | 制造商:AD 制造商全称:Analog Devices 功能描述:Tri-Mode: +3.3 V, +5 V, Adjustable Micropower Linear Voltage Regulators |
| ADM666AN | 制造商:Analog Devices 功能描述:Standard Regulator Pos 1.3V to 16V5V 0.04A 8-Pin PDIP 制造商:Analog Devices 功能描述:IC V REG ADJ +2/16.5V DIP8 666 |
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