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参数资料
| 型号： | LM2687LD/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHED CAPACITOR REGULATOR, 180 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LLP-8 |
| 文件页数： | 4/10页 |
| 文件大小： | 297K |
| 代理商： | LM2687LD/NOPB |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
IN to GND or GND
to OUT)
+ 5.8V
SD
(GND 0.3V) to
(V
IN + 0.3V)
V
NEG and VOUT Continuous Output
Current
10mA
V
OUT Short-Circuit Duration to GND
1 sec.
Continuous Power Dissipation (T
A =
25C) (Note 3)
600mW
T
JMAX (Note 3)
150C
θ
JA (Note 3)
250C/W
Operating Input Voltage Range
2.7V to 5.5V
Operating Output Current Range
0mA to 10mA
Operating Ambient
40C to 85C
Temp. Range
Operating Junction Temp. Range
40C to 110C
Storage Temperature
65C to 150C
Lead Temp. (Soldering, 10 sec.)
300C
ESD Rating (Note 4)
2kV
Electrical Characteristics
Limits with standard typeface apply for T
J = 25C, and limits in boldface type apply over the full temperature range. Unless
otherwise specified V
IN = 3.6V, C1 =C2 = 1F, C3 = 10F.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
Q
Supply Current
Open Circuit, No Load
500
950
A
I
SD
Shutdown Supply Current
0.05
1
A
F
SW
Switching Frequency
2.7V
≤ V
IN
≤.5.5V
V
IN = 3.6V
50
60
110
105
180
170
kHz
η
POWER
Power Efficiency at V
NEG
I
L = 3.6mA
I
L = 10mA
94
91
%
T
START
Start Up time
120
600
s
R
NEG
Output Resistance to V
NEG
30
V
R
Output Voltage Ripple
I
L =2.5mA, VOUT = 2.7V
I
L = 10mA, VOUT = 3.8V
1
2
mV
V
FB
Feedback Pin Reference
Voltage
I
L = 2.5mA (Note 9)
1.25
1.20
1.15
V
OUT
Adjustable Output Voltage
5.5V
≥ V
IN
≥ 2.7V, 2.5mA ≥ I
L
5.5V
≥ V
IN
≥ 3.0V, 10mA ≥ I
L
≥
0mA
(V
IN 0.3V)
(V
IN 1.2V)
V
Load Regulation
0 to 10mA, V
OUT = 2.4V
5
mV/mA
Line Regulation
5.5V
≥ V
IN
≥ 2.7V, I
L = 2.5mA
1
mV/V
V
IH
Shutdown Pin Input Voltage
High
5.5V
≥ V
IN
≥ 2.7V
2.2
V
IL
Shutdown Pin Input Voltage
Low
5.5V
≥ V
IN
≥ 2.7V
0.5
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to VIN may damage the device and must be avoided. Also, for
temperatures above TA = 85C, OUT must not be shorted to GND or VIN or device may be damaged.
Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction temperature), TA (ambient
temperature) and
θJA (junction-to-ambient thermal resistance). The maximum power dissipation at any temperature is:
PDiss
MAX =(TJMAX —TA)/
θ
JA up to the value listed in the Absolute Maximum Ratings.
Note 4: Rating is for the human body model, a 100pF capacitor discharged through a 1.5 k
resistor into each pin.
Note 5: The output switches operate at one half the oscillator frequency, fOSC =2fSW.
Note 6: All capacitors are 1F.
Note 7: Current drawn from VNEG pin decreases power efficiency and will increase output voltage ripple.
Note 8: In the test circuit, capacitors C1 and C2 are 1F, C3 = 10F, 0.30 maximum ESR capacitors. Capacitors with higher ESR will increase output resistance,
increase output voltage ripple, and reduce efficiency.
Note 9: The feedback resistors R1 and R2 are 200k
resistors.
LM2687
www.national.com
3
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