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參數資料
| 型號： | NCP1086ST-ADJT3 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 0.5mm Pitch DIL Vertical SMT Female Assembly, 2mm height, location pegs, hold-down tabs, tin, 11+11-way, Tape & Reel packing |
| 中文描述： | 1.25 V-5.5 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.4 V DROPOUT, PDSO4 |
| 封裝： | TO-261, SOT-223, 4 PIN |
| 文件頁數： | 5/14頁 |
| 文件大小： | 102K |
| 代理商： | NCP1086ST-ADJT3 |
NCP1086
http://onsemi.com
5
T
CASE
= 0
°
C
Figure 11. Ripple Rejection vs. Frequency
(Adjustable Output)
0
Output Current (A)
O
0.100
T
CASE
= 125
°
C
T
CASE
= 25
°
C
1.0
2.0
0.075
0.050
0.025
0
V
IN
V
OUT
(V)
M
4.0
0.60
0.55
0.45
0.40
0.65
0.50
1.0
2.0
3.0
5.0
6.0
7.0
T
CASE
= 25
°
C
T
CASE
= 125
°
C
T
CASE
= 0
°
C
10
1
Frequency (Hz)
R
85
75
65
55
45
35
25
15
10
2
10
3
10
4
10
5
10
6
10
1
Frequency (Hz)
R
85
75
65
55
45
35
25
15
10
2
10
3
10
4
10
5
10
6
Figure 12. Ripple Rejection vs. Frequency
(3.3 V Fixed Output)
Figure 13. Load Regulation vs. Output Current
(Adjustable Output)
Figure 14. Minimum Load Current vs V
IN
V
OUT
(Adjustable Output)
T
CASE
= 25
°
C
I
OUT
= 6A
(V
IN
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
C
Adj
= 0.1 F
T
CASE
= 25
°
C
I
OUT
= 6A
(V
IN
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
C
IN
= C
OUt
= 22 F Tantalum
APPLICATIONS INFORMATION
The NCP1086 voltage regulator series provides
adjustable and 3.3 V output voltages at currents up to 1.5 A.
The regulator is protected against overcurrent conditions
and includes thermal shutdown.
The NCP1086 series has a composite PNPNPN output
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Adjustable Operation
The adjustable output device has an output voltage range
of 1.25 V to 5.5 V. An external resistor divider sets the
output voltage as shown in Figure 15. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 A) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V
OUT
is necessary.
The output voltage is set according to the formula:
VOUT
VREF
R1
R2
R1
IAdj
R2
The term I
Adj
×
R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
2.0 mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. While not required, a
bypass capacitor from the adjust pin to ground will improve
ripple rejection and transient response. A 0.1 F tantalum
capacitor is recommended for “first cut” design. Type and
value may be varied to obtain optimum performance vs
price.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1086ST-ADJT3G | 功能描述:低壓差穩壓器 - LDO 1.25-5.5V ADJ 1.5A Commercial Temp RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCP1086T-033 | 功能描述:低壓差穩壓器 - LDO 3.3V 1.5A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCP1086T-033G | 功能描述:低壓差穩壓器 - LDO 3.3V 1.5A Commercial Temp RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCP1086T-33 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
| NCP1086T-ADJ | 功能描述:低壓差穩壓器 - LDO 1.25-5.5V ADJ 1.5A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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