參數(shù)資料
型號(hào)： LT1506IS8-3.3
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 24-SOIC 0 to 70
中文描述： 8.5 A SWITCHING REGULATOR, 560 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 417K
代理商： LT1506IS8-3.3
1
LT1506
4.5A, 500kHz Step-Down
Switching Regulator
I
Constant 500kHz Switching Frequency
I
Easily Synchronizable
I
Operates with Input as Low as 4V
I
Uses All Surface Mount Components
I
Inductor Size Reduced to 1.8
μ
H
I
Saturating Switch Design: 0.07
I
Shutdown Current: 20
μ
A
I
Cycle-by-Cycle Current Limiting
FEATURES
The LT
1506 is a 500kHz monolithic buck mode switching
regulator functionally identical to the LT1374 but optimized
for lower input voltage applications. It will operate over a
4V to 15V input range compared with 5.5V to 25V for the
LT1374. A 4.5A switch is included on the die along with all
the necessary oscillator, control and logic circuitry. High
switching frequency allows a considerable reduction in the
size of external components. The topology is current mode
for fast transient response and good loop stability. Both
fixed output voltage and adjustable parts are available.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
by keeping quiescent supply current to 4mA
and by utiliz-
ing a supply boost
capacitor to saturate the power switch.
The LT1506 fits into standard 7-pin DD and fused lead
SO-8 packages. Full cycle-by-cycle short-circuit protection
and thermal shutdown are provided. Standard surface
mount external parts are used, including the inductor and
capacitors. There is the optional function of shutdown or
synchronization. A shutdown signal reduces supply current
to 20
μ
A. Synchronization allows an external logic level sig-
nal to increase the internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
N
U
I
Portable Computers
I
Battery-Powered Systems
I
Battery Charger
I
Distributed Power
APPLICATIO
S
U
TYPICAL APPLICATIO
N
U
LOAD CURRENT (A)
0
E
90
85
80
75
70
2.0
2.5
3.0
3.5
1506 TA02
0.5
1.0
1.5
4.0
V
OUT
= 3.3V
V
IN
= 5V
L = 10
μ
H
Efficiency vs Load Current
5V to 3.3V Down Converter
BOOST
LT1506-3.3
SHDN
GND
V
IN
OUTPUT
3.3V
4A
INPUT
5V
10
μ
F TO
50
μ
F
CERAMIC
1506 TA01
C2
0.68
μ
F
C
1.5nF
D1
MBRS330T3
C1
100
μ
F, 10V
SOLID
TANTALUM
C3
D2
1N914
L1
5
μ
H
V
SW
SENSE
V
C
OPEN
OR
HIGH
= ON
+
+
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