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參數(shù)資料
| 型號(hào)： | LT1507IS8-3.3#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 291K |
| 代理商： | LT1507IS8-3.3#TR |
1
LT1507
500kHz Monolithic
Buck Mode Switching Regulator
5V to 3.3V Efficiency
LOAD CURRENT (A)
0
EFFICIENCY
(%)
100
90
80
70
60
50
1.00
LT1507 TA02
0.25
0.50
0.75
1.25
VIN = 5V
VOUT = 3.3V
TYPICAL APPLICATION
U
5V to 3.3V Volt Down Converter
VIN
SHDN
VSW
SENSE
BOOST
GND
VC
LT1507-3.3
D2
1N914
C2
0.1
F
L1***
5
H
D1
1N5818
CC
3.3nF
+
C1**
100
F
10V
TANTALUM
OUTPUT
3.3V
1.25A
DEFAULT
(OPEN)
= ON
+
C3*
47
F
16V
TANTALUM
5V
*
**
***
AVX TPSD477M016R0150 OR SPRAGUE 593D EQUIVALENT.
RIPPLE CURRENT RATING
≥ 0.6A
AVX TPSD108M010R0100 OR SPRAGUE 593D EQUIVALENT
COILTRONICS CTX5-1. SUBSTITUTION UNITS SHOULD BE RATED
AT
≥ 1.25A, USING LOW LOSS CORE MATERIAL
SEE BOOST PIN CONSIDERATIONS IN APPLICATIONS INFORMATION
SECTION FOR ALTERNATIVE D2 CONNECTION
with all the necessary oscillator, control and logic cir-
cuitry. 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 (3.3V) and adjustable
parts are available.
A special high speed bipolar process and new design
techniques allow this regulator to achieve high efficiency
at a high switching frequency. Efficiency is maintained
over a wide output current range by keeping quiescent
supply current to 4mA and by utilizing a supply boost
capacitor to allow the NPN power switch to saturate. A
shutdown signal will reduce supply current to 20
A. The
LT1507 can be externally synchronized from 570kHz to
1MHz with logic level inputs.
The LT1507 fits into standard 8-pin SO and PDIP pack-
ages. Temperature rise is kept to a minimum by the high
efficiency design. Full cycle-by-cycle short-circuit protec-
tion and thermal shutdown are provided. Standard surface
mount external parts are used including the inductor and
capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Portable Computers
s
Battery-Powered Systems
s
Battery Charger
s
Distributed Power
APPLICATIONS
U
FEATURES
s
Constant 500kHz Switching Frequency
s
Uses All Surface Mount Components
s
Operates with Inputs as Low as 4V
s
Saturated Switch Design (0.3
)
s
Cycle-by-Cycle Current Limiting
s
Easily Synchronizable
s
Inductor Size as Low as 2
H
s
Shutdown Current: 20
A
The LT
1507 is a 500kHz monolithic buck mode switching
regulator, functionally identical to the LT1375 but opti-
mized for lower input voltage applications. It will operate
over a 4V to 15V input range, compared with 5.5V to 25V
for the LT1375. A 1.5A switch is included on the die along
DESCRIPTION
U
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