TYPICAL APPLICATIONS U 3.3V Output Low Dropout Linear R" />
參數(shù)資料
型號(hào): LTC1540IS8#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 11/12頁(yè)
文件大小: 0K
描述: IC COMP NANOPOWER W/REF 8-SOIC
標(biāo)準(zhǔn)包裝: 2,500
類型: 帶電壓基準(zhǔn)
元件數(shù): 1
輸出類型: CMOS,TTL
電壓 - 電源,單路/雙路(±): 2 V ~ 11 V,±1 V ~ 5.5 V
電壓 - 輸入偏移(最小值): 12mV @ 5V
電流 - 靜態(tài)(最大值): 710nA
CMRR, PSRR(標(biāo)準(zhǔn)): 80dB CMRR,80dB PSRR
傳輸延遲(最大): 60µs
磁滯: 50mV
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
安裝類型: 表面貼裝
包裝: 帶卷 (TR)
8
LTC1540
sn1540 1540fas
TYPICAL APPLICATIONS
U
3.3V Output Low Dropout Linear Regulator
The LTC1540 can be connected as a micropower (IQ =
5.5A at VIN = 5V) low dropout linear regulator (Figure 7).
When the output is low, Q1 turns on, allowing current to
charge output capacitor C1. Local feedback formed by R4,
Q1 and Q2 creates a constant-current source from the 5V
input to C1. R4, R1 and Q2’s VBE also provide current
limiting in the case of an output short-circuit to ground. C2
reduces output ripple, while the R2-R3 feedback voltage
divider establishes the output voltage.
Auto Power-Off Source
Figure 8 shows the circuit for a 30mA power supply that
has a timed auto power-off function. The comparator
output is the switched power supply output. With a 10mA
load, it typically provides a voltage of (VBAT – 0.17V). The
whole circuit draws a mere 0.8A of quiescent current with
VBAT = 5V. The three resistor voltage divider programs
50mV of hysteresis for the comparator, and sets the IN
voltage at 200mV. This gives an IN + trip threshold of
approximately 150mV
The RC time constant determines the maximum power-on
time of the OUT pin before power down occurs. This period
can be approximated by:
t = 4.6RC (seconds)
The actual time will vary with both the leakage current of
the capacitor and the input current at the IN + pin.
Figure 7. 3.3V Output Low Dropout Linear Regulator
V +
V
1
C3
2
7
8
R1
47k
GND
OUT
1540 F07
IN+
IN
HYST
REF
3
4
5
6
+
R3
750k
1%
R2
430k
1%
R4
10
Q1
TP0610L
VIN = 5V
Q2
2N3906
C1
10F
VOUT
3.3V
C2
2.2nF
LTC1540
V +
IN+
OUT
432k
VBAT
V
21
7
8
3
GND
CR
(VBAT – 0.17V)
10mA
MOMENTARY
SWITCH
LTC1540
1540 F08
IN
HYST
REF
4
5
6
121k
2M
+
Figure 8. Auto Power-Off Switch Operates
on 0.8A Quiescent Current
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