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LT1572CS Datasheet

  • LT1572CS

  • Linear Technology [100kHz, 1.25A Switching Regulator with C...

  • 258.48KB

  • LINER

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LT1572
ELECTRICAL CHARACTERISTICS
V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open, unless otherwise noted.
Note 5:
See graphs for guaranteed forward voltage and reverse leakage
current over temperature. Parameters are 100% tested at 25掳C and
guaranteed at other temperatures by design and QA sampling.
Note 6:
Package soldered to FR4 board with
鈮?oz
copper and an internal
or backside plane underneath the package to aid thermal transfer. Diode is
partly thermally coupled to regulator section. See Application Information
section for details on thermal calculations.
The
q
denotes the specifications which apply over the full operating
temperature range, 0掳C to 100掳C for the regulator chip and 0掳C to 125掳C
for the diode.
Note 1:
Measured with V
C
in hi clamp, V
FB
= 0.8V. I
SW
= 1A.
Note 2:
For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I
LIM
= 0.833 (2 鈥?DC).
Note 3:
Minimum input voltage for isolated flyback mode is 7V.
Note 4:
Because the catch diode has a peak repetitive reverse voltage of
20V, diode breakdown may be the limiting factor on input voltage or
switch voltage in many applications.
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Current Limit vs Duty Cycle
4
2.9
SWITCH SATURATION VOLTAGE (V)
MINIMUM INPUT VOLTAGE (V)
SWITCH CURRENT (A)
3
25掳C
2
鈥?5掳C
125掳C
1
0
0
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1572 G01
Line Regulation
5
REFERENCE VOLTAGE CHANGE (mV)
4
REFERENCE VOLTAGE (V)
3
2
1
0
鈥?
鈥?
鈥?
鈥?
鈥?
0
10
T
J
= 鈥?5掳C
T
J
= 150掳C
FEEDBACK BIAS CURRENT (nA)
T
J
= 25掳C
30
40
20
INPUT VOLTAGE (V)
4
U W
50
60
1572 G04
Minimum Input Voltage
1.6
Switch Saturation Voltage
1.4
150掳C
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
SWITCH CURRENT (A)
1572 G03
SWITCH CURRENT = 1.25A
2.8
2.7
2.6
SWITCH CURRENT = 0A
2.5
2.4
2.3
鈥?5 鈥?0 鈥?5
100掳C
25掳C
鈥?5掳C
0 25 50 75 100 125 150
TEMPERATURE (掳C)
1572 G02
Reference Voltage vs Temperature
1.250
1.248
1.246
1.244
1.242
1.240
1.238
1.236
1.234
鈥?5 鈥?0 鈥?5
800
700
600
500
400
300
200
100
Feedback Bias Current vs
Temperature
25 50 75 100 125 150
TEMPERATURE (掳C)
0
1572 G05
0
鈥?5 鈥?0 鈥?5
25 50 75 100 125 150
TEMPERATURE (掳C)
0
1572 G06

LT1572CS 产品属性

  • LT1572

  • 50

  • 集成电路 (IC)

  • PMIC - 稳压器 - DC DC 开关稳压器

  • -

  • 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器，Sepic

  • -

  • 1

  • -

  • 3 V ~ 30 V

  • 电流模式

  • 100kHz

  • 1.25A

  • 无

  • 0°C ~ 100°C

  • 表面贴装

  • 16-SOIC（0.154"，3.90mm 宽）

  • 管件

  • 16-SOIC

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