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參數(shù)資料
| 型號： | LTC3700 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant Frequency Step-Down DC/DC Controller with LDO Regulator |
| 中文描述： | 恒頻降壓DC / DC控制器LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 209K |
| 代理商： | LTC3700 |
3
LTC3700
3700f
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC3700 is guaranteed to meet specifications from0
°
Cto
70
°
C. Specifications over the –40
°
C to 85
°
C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
θ
JA
°
C/W)
Note 4:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5:
The LTC3700 is tested in a feedback loop that servos V
FB
to the
output of the error amplifier.
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as given in Figure 2.
Note 7:
Guaranteed by design; not tested in production.
Note 8:
PGOOD values are expressed as a percentage difference from the
respective “Regulated Feedback Voltage” as given in the table.
PARAMETER
LDO Regulator
V
IN2
Input Voltage
Input DC Supply Current
Normal Operation with Buck Enabled
Normal Operation with Buck Undervoltage
Shutdown with Buck Enabled
Shutdown with Buck Undervoltage
Regulated Feedback Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
ELECTRICAL CHARACTERISTICS
range, otherwise specifications are at T
A
= 25
°
C. V
IN
= V
IN2
= 4.2V unless otherwise specified. (Note 2)
The
G
denotes specifications that apply over the full operating temperature
2.4
6
V
Typicals at V
IN2
= 4.2V
2.4V
≤
V
IN2
≤
6V
2.4V
≤
V
IN2
≤
6V
2.4V
≤
V
IN2
≤
6V, V
ITH/RUN
= 0V
2.4V
≤
V
IN2
≤
6V, V
ITH/RUN
= 0V
0
°
C
≤
T
A
≤
70
°
C, I
LDO
= 1mA
–40
°
C
≤
T
A
≤
85
°
C, I
LDO
= 1mA
(Unity-Gain Feedback)
2.65V
≤
V
IN
≤
9.8V
2.4V
≤
V
IN2
≤
6V, I
LDO
= 1mA
2.4V
≤
V
IN2
≤
6V, I
LDO
= 1mA
1mA
≤
I
LOAD
≤
150mA
50
100
0
8
0.800
0.800
100
150
1
24
0.830
0.835
μ
A
μ
A
μ
A
μ
A
V
V
G
G
0.780
0.765
Output Voltage Line Regulation
With Buck Enabled
With Buck Enabled
With Buck Undervoltage
Output Voltage Load Regulation
V
FB2
Input Current
LDO Short-Circuit Current
LDO Dropout
0.05
4
4
0.06
0
200
270
170
150
5
mV/V
mV/V
mV/V
mV/mA
0.12
10
nA
mA
mV
mV
°
C
°
C
V
LDO
= 0V
V
IN2
= 3.3V, I
LDO
= 150mA
V
IN2
= 6V, I
LDO
= 150mA
(Note 7)
(Note 7)
150
Overtemperature Trip Point
Overtemperature Hysteresis
PGOOD
Feedback Voltage PGOOD Threshold
PGOOD High-to-Low
(Note 8)
V
FB
or V
FB2
Falling
V
FB
or V
FB2
Rising
V
FB
or V
FB2
Rising
V
FB
or V
FB2
Falling
V
ITH/RUN
= 0V, V
IN
= V
IN2
= 4.2V, V
PGOOD
= 100mV
–12
–7.5
7.5
–5.0
5.0
135
%
%
%
%
12
PGOOD Low-to-High
–10
10
180
PGOOD On-Resistance
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