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參數(shù)資料
| 型號： | ADP3302 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 100 mA Low Dropout Dual Linear Regulator(高精度低壓差雙線性穩(wěn)壓器) |
| 中文描述： | 一〇 〇毫安低壓差線性穩(wěn)壓器，雙（高精度低壓差雙線性穩(wěn)壓器） |
| 文件頁數(shù)： | 8/8頁 |
| 文件大小： | 282K |
| 代理商： | ADP3302 |
–8–
C
P
Phase One: When the input voltage is equal to 3.7 V or higher,
the ADP3000 is off and the ADP3302 operates on its own to
regulate the output voltage. At this phase, current is flowing into
the input pins of the ADP3302 via the inductor L1 and the
Schottky diode. At the same time, the ADP3000 is set into sleep
mode by pulling the FB pin (via R9 and R10 resistor divider
network) to about 10% higher than its internal reference which
is set to be 1.245 V.
Phase Two: As the input voltage drops below 3.7 V, the
decreasing input voltage causes the voltage of the FB pin to be
within 5% of the 1.245 V reference. This triggers the ADP3000
to turn on, providing a 3.4 V regulated output to the inputs of
the ADP3302. The ADP3000 continues to supply the 3.4 V
regulated voltage to the ADP3302 until the input voltage drops
below 2.5 V.
Phase Three: When the input voltage drops below 2.5 V, the
ADP3302 will shut down and the ADP3000 will go into sleep
mode. With the input voltage below 2.5 V, the resistor divider
network, R1 and R2, applies a voltage that is lower than the
ADP3000’s internal 1.245 V reference voltage to the SET pin.
This causes the A
O
pin to have a voltage close to 0 V, which
causes the ADP3302 to go into shutdown directly and Q1 to
turn on and pull the FB pin 10% or higher than the internal
1.245 V reference voltage. With the FB pin pulled high, the
ADP3000 goes into sleep mode.
80
75
70
65
%
AT V
≤
2.5V
SHDN IQ = 500μA
I
O
= 50mA + 50mA
I
O
= 100mA + 100mA
2.6
3.0
3.4
3.8
4.2
V
IN
(V)
Figure 21. Typical Efficiency of the Circuit of Figure 20
Refer to Figure 20. R9 and R10 set the output voltage of the
ADP3000. R1, R2, and R3 set the shutdown threshold voltage
for the circuit. For further details on the ADP3000, please refer
to the ADP3000 data sheet.
Supply Sequencing Circuit
Figure 22 shows a simple and effective way to achieve sequenc-
ing of two different output voltages, 3.3 V and 5 V, in a mixed
supply voltage system. In most cases, these systems need careful
sequencing for the supplies to avoid latchup.
At turn-on, D1 rapidly charges up C1 and enables the 5V out-
put. After a R2-C2 time constant delay, the 3.3 V output is
enabled. At turn-off, D2 quickly discharges C2 and R3 pulls
SD1 low, turning off the 3.3 V output first. After a R1-C1 time
constant delay, the 5 V output turns off.
ADP3302
2
OUT1
IN
1
8
ERR
V
OUT1
3.3V
C5
1μF
5
V
IN
= 6V TO 12V
GND
3
SD1
IN
OUT2
V
5.0V
SD2
C2
0.01μF
C1
0.01μF
C4
0.5μF
C3
0.5μF
ON/OFF
3.3V
D2
D1
R2
220k
R1
220k
D3
R3
330k
4
7
6
Figure 22. Turn-On/Turn-Off Sequencing for Mixed Supply
Voltages
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin SOIC
(SO-8)
0.1968 (5.00)
0.1890 (4.80)
8
5
4
1
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0500
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
°
0
°
0.0196 (0.50)
°
REV. 0
ADP3302
3V
100mA
3V
100mA
1μF
6V
(MLC)
1μF
6V
(MLC)
C4
C5
IN
IN
SD
GND
V
O2
V
O2
ADP3302
C3
100μF
10V
AVX-TPS
R9
348k
1%
R10
200k
1%
IN5817
L1
6.6μF
(SUMIDA–CDRH62)
Q1
2N2907
R5
330k
R6
100k
R8
10k
R7
90k
C2
33nF
R4
120k
R1
100k
C1
100μF
10V
AVX-TPS
R3
1M
R2
90k
2.5V
→
4.2V
V
IN
I
LIM
SET
A
O
GND SW2
SW1
FB
ADP3000
Figure 20. Cell Li-Ion to 3 V/200 mA Converter with Shutdown at V
IN
< 2.5 V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP3303AARU-REEL | High Accuracy anyCAP⑩ Adjustable 200 mA Low Dropout Linear Regulator |
| ADP3303AR-3.2 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| ADP3303AR-3.3 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| ADP3303AR-2.7 | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| ADP3303AR-27 | RECTIFIER SCHOTTKY DUAL 40A 30V 375A-ifsm 0.58V-vf 1mA-ir TO-3P 30/TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3302AR1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Precision anyCAP⑩ Dual Low Dropout Linear Regulator |
| ADP3302AR2 | 制造商:Rochester Electronics LLC 功能描述:HI ACCURACY DUAL LOW DROPOUT REGULATOR - Bulk |
| ADP3302AR3 | 制造商:Rochester Electronics LLC 功能描述:HI ACCURACY DUAL LOW DROPOUT REGULATOR - Bulk |
| ADP3302AR-3.2 | 制造商:Analog Devices 功能描述: |
| ADP3302AR-3.3 | 制造商:Analog Devices 功能描述:REG LDO LIN FIX POS 3.3V 0.1A 8PIN SO - Bulk |
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