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參數(shù)資料
| 型號： | LM2621MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Input Voltage, Step-Up DC-DC Converter |
| 中文描述： | 2.85 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MINI, SO-8 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 254K |
| 代理商： | LM2621MMX |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
SW Pin Voltage
BOOT, V
DD
, EN and FB Pins
FREQ Pin
θ
JA
(Note 2)
T
Jmax
(Note 2)
Storage Temperature Range
Lead Temp. (Soldering, 5 sec)
0.5 V to 14.5V
0.5V to 10V
100μA
240C/W
150C
65C to +150C
260C
Power Dissipation (T
A
=25C)
(Note 2)
ESD Rating (Note 3)
500mW
2kV
Operating Conditions
(Note 1)
V
DD
Pin
FB, EN Pins
BOOT Pin
Ambient Temperature (T
A
)
2.5V to 5V
0 to V
DD
0 to 10V
40C to +85C
Electrical Characteristics
Limits in standard typeface are for T
= 25C, and limits in
boldface
type apply over the full operating temperature range of
40C to +85C. Unless otherwise specified: V
DD
= V
OUT
= 3.3V.
Symbol
Parameter
Condition
V
IN_ST
Minimum Start-Up Supply
Voltage (Note 4)
V
IN_OP
Minimum Operating Supply
Voltage (once started)
V
FB
FB Pin Voltage
V
OUT_MAX
Maximum Output Voltage
V
HYST
Hysteresis Voltage (Note 7)
η
Efficiency
V
IN
= 3.6V; V
OUT
= 5V; I
LOAD
= 500mA
V
IN
= 2.5V; V
OUT
= 3.3V; I
LOAD
= 200mA
D
Switch Duty Cycle
I
DD
Operating Quiescent Current
(Note 6)
I
SD
Shutdown Quiescent Current
(Note 7)
5.0V; EN Pin
<
200mV
I
CL
Switch Peak Current Limit
R
DS_ON
MOSFET Switch On
Resistance
Enable Section
V
EN_LO
EN Pin Voltage Low (Note 8)
V
EN_HI
EN Pin Voltage High (Note 8)
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its rated operating conditions.
Note 2:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
(maximum junction temperature),
θ
JA
(junction to am-
bient thermal resistance), and T
(ambient temperature). The maximum allowable power dissipation at any temperature is P
dmax
= (T
jmax
- T
A
)/
θ
JA
or the number
given in the Absolute Maximum Ratings, whichever is lower.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5 k
resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV.
Note 4:
Output in regulation, V
OUT
= V
OUT (NOMINAL
)
±
5%
Note 5:
This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme.
Note 6:
This is the current into the V
DD
pin.
Note 7:
This is the total current into pins V
DD
, BOOT, SW and FREQ.
Note 8:
When the EN pin is below V
EN_LO
, the regulator is shut down; when it is above V
EN_HI
, the regulator is operating.
Typ
1.1
Min
Max
1.2
Units
V
I
LOAD
= 0mA
I
LOAD
= 0mA
0.65
V
1.24
14
30
1.2028
1.2772
V
V
45
mV
87
%
87
70
80
60
80
110
%
μA
FB Pin
>
1.3V; EN Pin at V
DD
V
DD
, BOOT and SW Pins at
0.01
2.5
μA
2.85
0.17
A
0.15V
DD
V
V
0.7V
DD
L
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