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| 型号： | LT1507IS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1507
500kHz Monolithic
Buck Mode Switching Regulator
FEATURES
s
s
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s
Constant 500kHz Switching Frequency
Uses All Surface Mount Components
Operates with Inputs as Low as 4V
Saturated Switch Design (0.3 ? )
Cycle-by-Cycle Current Limiting
Easily Synchronizable
Inductor Size as Low as 2 μ H
Shutdown Current: 20 μ A
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
APPLICATIO N S
at a high switching frequency. Efficiency is maintained
over a wide output current range by keeping quiescent
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Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power
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 μ A. The
LT1507 can be externally synchronized from 570kHz to
1MHz with logic level inputs.
DESCRIPTIO N
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
TYPICAL APPLICATIO N
5V to 3.3V Volt Down Converter
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.
5V to 3.3V Efficiency
D2 ?
1N914
100
V IN = 5V
V OUT = 3.3V
BOOST
C2
0.1 μ F
OUTPUT
90
5V
C3*
47 μ F
16V
TANTALUM
+
DEFAULT
(OPEN)
= ON
V IN V SW
LT1507-3.3
SHDN SENSE
GND V C
C C
3.3nF
L1***
5 μ H
D1
1N5818
+
3.3V
1.25A
C1**
100 μ F
10V
80
70
60
TANTALUM
* AVX TPSD477M016R0150 OR SPRAGUE 593D EQUIVALENT.
RIPPLE CURRENT RATING ≥ 0.6A
** AVX TPSD108M010R0100 OR SPRAGUE 593D EQUIVALENT
50
0
0.25
0.50
0.75
1.00
1.25
*** 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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