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LT1507I

更新时间： 2024-11-10 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 346K
描述
500kHz Monolithic Buck Mode Switching Regulator

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LT1507I 数据手册

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LT1507  
500kHz Monolithic  
Buck Mode Switching Regulator  
FEATURES  
■
with all the necessary oscillator, control and logic cir-  
cuitry. High switching frequency allows a considerable  
reductioninthesizeofexternalcomponents.Thetopology  
is current mode for fast transient response and good loop  
stability. Both fixed output voltage (3.3V) and adjustable  
parts are available.  
Constant 500kHz Switching Frequency  
■
Uses All Surface Mount Components  
■
Operates with Inputs as Low as 4V  
Saturated Switch Design (0.3Ω)  
Cycle-by-Cycle Current Limiting  
Easily Synchronizable  
Inductor Size as Low as 2µH  
Shutdown Current: 20µA  
■
■
■
■
■
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 20µA. The  
LT1507 can be externally synchronized from 570kHz to  
1MHz with logic level inputs.  
U
APPLICATIONS  
■
Portable Computers  
Battery-Powered Systems  
Battery Charger  
Distributed Power  
■
■
■
U
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-  
tionandthermalshutdownareprovided.Standardsurface  
mount external parts are used including the inductor and  
capacitors.  
DESCRIPTION  
TheLT®1507isa500kHzmonolithicbuckmodeswitching  
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  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
5V to 3.3V Volt Down Converter  
5V to 3.3V Efficiency  
100  
D2†  
1N914  
V
IN  
V
OUT  
= 5V  
= 3.3V  
90  
80  
70  
60  
50  
C2  
0.1µF  
BOOST  
OUTPUT  
3.3V  
5V  
V
IN  
V
SW  
L1***  
5µH  
1.25A  
LT1507-3.3  
C3*  
47µF  
16V  
+
DEFAULT  
(OPEN)  
= ON  
SHDN  
GND  
SENSE  
TANTALUM  
V
C
C1**  
100µF  
10V  
D1  
1N5818  
+
C
C
3.3nF  
TANTALUM  
AVX TPSD477M016R0150 OR SPRAGUE 593D EQUIVALENT.  
RIPPLE CURRENT RATING ≥ 0.6A  
*
0
0.25  
0.50  
0.75  
1.00  
1.25  
AVX TPSD108M010R0100 OR SPRAGUE 593D EQUIVALENT  
COILTRONICS CTX5-1. SUBSTITUTION UNITS SHOULD BE RATED  
AT ≥ 1.25A, USING LOW LOSS CORE MATERIAL  
**  
***  
LOAD CURRENT (A)  
LT1507 • TA02  
†
SEE BOOST PIN CONSIDERATIONS IN APPLICATIONS INFORMATION  
SECTION FOR ALTERNATIVE D2 CONNECTION  
1
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