參數(shù)資料
型號(hào): LT1072
廠商: Texas Instruments, Inc.
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述: 射頻放大器
文件頁數(shù): 5/17頁
文件大小: 354K
代理商: LT1072
LT1072, LT1072HV
1.25-A HIGH-EFFICIENCY SWITCHING REGULATORS
SLVS071A – NOVEMBER 1989 – REVISED AUGUST 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
IN
= 15 V, V
FB
= V
ref
with SW
output open (unless otherwise noted)
output section
PARAMETER
TEST CONDITIONS
V(IN) = 3 V to MAX,
TJ
MIN
65
TYP§
MAX
UNIT
V(BR)(SW)
Switch breakdown voltage
V(FB) = 1.5 V,
I(SW) = 5 mA
V(FB) = 0.8 V,
LT1072
Full range
V
LT1072HV
75
ron
Switch on-state resistance
I(SW) = 1.25 mA
Full range
0.6
1
Control-to-switch
transconductance
25
°
C
2
mho
I(SW)(lim)
S i h
Switch current limit
li i
V(FB) = 0.8 V,
See Note 2
0 8 V
Duty cycle
50%
Duty cycle
50%
Duty cycle = 80%
25
°
C
<25
°
C
Full range
1.25
3
1.25
3.5
A
1
2.5
I(IN)/
I(SW)
Input current increase
during switch turn-on
V(FB) = 0.8 V
25
°
C
25
35
mA/A
f
Frequency
25
°
C
Full range
25
°
C
25
°
C
35
40
45
kHz
33
47
Maximum duty cycle
V(FB) = 1 V
90%
92%
97%
td
Flyback sense delay time
1.5
μ
s
shutdown section
PARAMETER
TEST CONDITIONS
TJ
25
°
C
25
°
C
Full range
MIN
TYP§
MAX
UNIT
Ioff(IN)
Shutdown mode input current
V(IN) = 3 V to MAX,
V(C) = 0.05 V
100
250
μ
A
V(TO)(C)
Control threshold voltage
V(IN)= 3 V to MAX
V(IN) = 3 V to MAX
100
50
150
250
300
mV
total device
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP§
MAX
UNIT
VI(min)(IN)
II(IN)
For conditions shown as MIN or MAX, use the appropriate value specified under the recommended operating conditions.
Full range virtual junction temperature is 0
°
C to 100
°
C for LT1072C and LT1072HVC and –40
°
C to 125
°
C for LT1072I and LT1072HVI.
§All typical values are TA = 25
°
C.
NOTE 2: For duty cycles between 50% and 80%, minimum switch output current is given by I(SW)(lim) = 0.833 (2-duty cycle).
Minimum input voltage
Full range
25
°
C
2.6
3
V
Input current
V(IN) = 3 V to MAX,
V(C) = 0.6 V
6
9
mA
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