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LT1307BIS8 Datasheet

  • LT1307BIS8

  • Single Cell Micropower 600kHz PWM DC/DC Converters

  • 20頁

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LT1307/LT1307B
Single Cell Micropower
600kHz PWM DC/DC Converters
FEATURES
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DESCRIPTION
The LT
廬
1307/LT1307B are micropower, fixed frequency
DC/DC converters that operate from an input voltage as
low as 1V. First in the industry to achieve true current
mode PWM performance from a single cell supply, the
LT1307 features automatic shifting to power saving Burst
Mode operation at light loads. High efficiency is main-
tained over a broad 100碌A to 100mA load range. The
LT1307B does not shift into Burst Mode operation at light
loads, eliminating low frequency output ripple at the
expense of light load efficiency. The devices contain a low-
battery detector with a 200mV reference and shut down to
less than 5碌A. No load quiescent current of the LT1307 is
50碌A and the internal NPN power switch handles a 500mA
current with a voltage drop of just 295mV.
Unlike competitive devices, large electrolytic capacitors
are
not required
with the LT1307/LT1307B in single cell
applications. The high frequency (600kHz) switching al-
lows the use of tiny surface mount multilayer ceramic
(MLC) capacitors along with small surface mount induc-
tors. The devices work with just 10碌F of output capaci-
tance and require only 1碌F of input bypassing.
The LT1307/LT1307B are available in 8-lead MSOP, PDIP
and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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Uses Small Ceramic Capacitors
50碌A Quiescent Current (LT1307)
1mA Quiescent Current (LT1307B)
Operates with V
IN
as Low as 1V
600kHz Fixed Frequency Operation
Starts into Full Load
Low Shutdown Current: 3碌A
Low-Battery Detector
3.3V at 75mA from a Single Cell
Automatic Burst Mode
TM
Operation at
Light Load (LT1307)
Continuous Switching at Light Load (LT1307B)
Low V
CESAT
Switch: 295mV at 500mA
APPLICATIONS
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Pagers
Cordless Telephones
GPS Receivers
Battery Backup
Portable Electronic Equipment
Glucose Meters
Diagnostic Medical Instrumentation
TYPICAL APPLICATION
L1
10碌H
D1
C1: MURATA-ERIE GRM235Y5V105Z01
MARCON THCS50E1E105Z
TOKIN 1E105ZY5U-C103-F
3.3V
C2: MURATA-ERIE GRM235Y5V106Z01
75mA
MARCON THCS50E1E105Z
TOKIN 1E106ZY5U-C304-F
D1: MOTOROLA MBR0520L
C2
L1: COILCRAFT D01608C-103
10碌F
SUMIDA CD43-100
MURATA ERIE LQH3C100
FOR 5V OUTPUT: R1 = 1M, R2 = 329k
1307 F01
Single Cell to 3.3V Converter Efficiency
90
C1
1碌F
1.5V
CELL
SHUTDOWN
V
IN
LBI
SW
FB
R1
1.02M
1%
R2
604k
1%
EFFICIENCY (%)
LT1307
SHDN
LBO
GND
V
C
100k
680pF
Figure 1. Single Cell to 3.3V Boost Converter
U
80
70
60
U
U
V
IN
= 1.5V
V
IN
= 1V
V
IN
= 1.25V
50
0.1
1
10
LOAD CURRENT (mA)
100
1307 TA01
1

LT1307BIS8 產(chǎn)品屬性

  • LT1307/B

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器

  • -

  • 升壓（升壓）

  • 固定

  • 1

  • 3.3V，5V

  • 1 V ~ 5 V

  • 電流模式，混合

  • 600kHz

  • 100mA

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 8-SOIC

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