參數(shù)資料
型號： LT1738EG
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Slew Rate Controlled Ultralow Noise DC/DC Controller
中文描述： 0.3 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 5.30 MM, PLASTIC, SSOP-20
文件頁數(shù)： 3/20頁
文件大?。?/td> 248K
代理商： LT1738EG
3
LT1738
1738fa
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. V
IN
= 12V, V
C
= 0.9V, V
FB
= V
REF
, R
VSL
, R
CSL
= 16.9k, R
T
= 16.9k and
other pins open unless otherwise noted.
The
G
denotes the specifications which apply over the full operating
SYMBOL
Oscillator and Sync
f
MAX
f
SYNC
V
SYNC
R
SYNC
Gate Drive
DC
MAX
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2:
Supply current specification includes loads on each gate as in
Figure 1a. Actual supply currents vary with operating frequency, operating
voltages, V5 load, slew rates and type of external FET.
Note 3:
The LT1738E is guaranteed to meet performance specifications
from 0
°
C to 70
°
C. Specifications from –40
°
C to 125
°
C are assured by
Max Switch Frequency
Synchronization Frequency Range
SYNC Pin Input Threshold
SYNC Pin Input Resistance
250
kHz
kHz
Oscillator Frequency = 250kHz
290
0.7
G
1.4
40
2
k
Maximum Switch Duty Cycle
R
VSL
= R
CSL
= 3.9k,
Osc Frequency = 25kHz
V
IN
= 12, GCL = 12
V
IN
= 12, GCL = 8
V
IN
= 12V
V
IN
= 12V
V
IN
= 12V
V
GCL
= 6.5V
G
90
93.5
%
VG
ON
Gate On Voltage
10
7.6
10.4
7.9
0.2
10.7
8.1
0.35
V
V
V
A
A
V
VG
OFF
IG
SO
IG
SK
V
INUVLO
Current Sense
t
IBL
V
SENSE
V
SENSEF
Slew Control for the Following Slew Tests See Test Circuit in Figure 1b
V
SLEWR
Output Voltage Slew Rising Edge
V
SLEWF
Output Voltage Slew Falling Edge
VI
SLEWR
Output Current Slew Rising Edge (CS pin V)
VI
SLEWF
Output Current Slew Falling Edge (CS pin V)
Supply and Protection
V
INMIN
Minimum Input Voltage (Note 4)
I
VIN
Supply Current (Note 3)
Gate Off Voltage
Max Gate Source Current
Max Gate Sink Current
Gate Drive Undervoltage Lockout (Note 5)
0.3
0.3
7.3
7.5
Switch Current Limit Blanking Time
Sense Voltage Shutdown Voltage
Sense Voltage Fault Threshold
100
103
220
ns
mV
mV
V
C
Pulled Low
G
86
120
300
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
26
19
2.1
2.1
V/
μ
s
V/
μ
s
V/
μ
s
V/
μ
s
V
GCL
= V
IN
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
G
2.55
12
35
1.39
110
24
5
5
3.6
40
55
1.48
180
35
5.20
5.15
V
V
IN
= 12
V
IN
= 20
G
mA
mA
V
SHDN
V
SHDN
I
SHDN
V5
Shutdown Turn-On Threshold
Shutdown Turn-On Voltage Hysteresis
Shutdown Input Current Hysteresis
5V Reference Voltage
G
1.31
50
10
4.85
4.80
10
–10
V
G
mV
μ
A
G
6.5V
≤
V
IN
≤
20V, IV5 = 5mA
6.5V
≤
V
IN
≤
20V, IV5 = –5mA
V
IN
= 6.5V Source
V
IN
= 6.5V Sink
V
V
IV5
SC
5V Reference Short-Circuit Current
mA
mA
design, characterization and correlation with statistical process
controls.The LT1738I is guaranteed and tested to meet performance
specifications from –40
°
C to 125
°
C.
Note 4:
Output gate drive is enabled at this voltage. The GCL voltage will
also determine driver activity.
Note 5:
Gate drive is ensured to be on when V
IN
is greater than max value.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LT1738EG#TRPBF 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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