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LT1572CS Datasheet

  • LT1572CS

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

  • 258.48KB

  • LINER

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LT1572
100kHz, 1.25A Switching
Regulator with Catch Diode
FEATURES
s
s
s
s
s
s
s
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s
DESCRIPTIO
Catch Diode Included in Package
Wide Input Voltage Range: 3V to 30V
Low Quiescent Current: 6mA
Internal 1.25A Switch
Very Few External Parts Required
Self-Protected Against Overloads
Operates in Nearly All Switching Topologies
Shutdown Mode Draws Only 50碌A Typical Current
Can Be Externally Synchronized
The LT
庐
1572 is a 1.25A 100kHz monolithic switching
regulator with on-board switch and catch diode included
in one package. It combines an LT1172 with a 1A Schottky
catch diode. The LT1572 can be operated in all standard
switching configurations, including boost, buck, SEPIC,
flyback, forward, inverting and 鈥淐uk鈥? All necessary con-
trol, oscillator and protection circuitry is included on the
die with the high efficiency switch. This makes the part
extremely easy to use and provides 鈥渂ustproof鈥?operation
similar to that obtained with 3-pin linear regulators.
The LT1572 operates with supply voltages from 3V to 30V
and draws only 6mA quiescent current. It can deliver load
power up to 15W with no external power devices. By
utilizing a current mode switching technique, the LT1572
achieves excellent response to load and line transients.
The LT1572 has many unique features not found on the
more difficult to use control chips presently available. It
uses adaptive anti-sat switch drive to allow very wide
ranging load currents with no loss in efficiency. An exter-
nally activated shutdown mode reduces total supply cur-
rent to 50碌A typical for standby operation. External syn-
chronizing of switching frequency is possible, with a range
of 120kHz to 160kHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATI
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s
S
s
3.3V-to-5V and 5V-to-12V Boost Converters
Negative-to-Positive Converter
SEPIC Converter (Input Can Be Greater or
Less Than Output)
Battery Charger
TYPICAL APPLICATI
V
IN
4.5V
TO 10V
L1*
50碌H
9
V
IN
11
5V-to-12V Boost Converter
100
Boost Converter Efficiency
BOOST CONVERTER
V
IN
= 5V
V
OUT
= 12V
2 15
EFFICIENCY (%)
V
SW
ANODE
鈥?/div>
3
CATHODE
鈥?/div>
14
*COILTRONICS CTX50-2
**AVX TPS OR SPRAGUE 593D
鈥?/div>
ALWAYS CONNECT BOTH ANODE (2, 15)
AND CATHODE (3, 14) PINS
12V
0.25A
90
80
+
LT1572
C3
100碌F
10V
FB
E1
10
E2
12
GND
4, 13
V
C
5
R3
1k
C1
1碌F
R1
10.7k
1%
70
+
R2
1.24k
1%
C2**
100碌F
16V
60
50
0
50
LT1572 鈥?TA01
U
150
200
100
L0AD CURRENT (mA)
250
LT1572 鈥?TA01
UO
UO
1

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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