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LT1308ACF Datasheet

  • LT1308ACF

  • Linear Technology [High Current, Micropower Single Cell, 60...

  • LINER

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Final Electrical Specifications
LT1308A/LT1308B
High Current, Micropower
Single Cell, 600kHz
DC/DC Converters
FEATURES
s
s
s
s
s
s
DESCRIPTION
August 1999
s
s
s
s
s
5V at 1A from a Single Li-Ion Cell
5V at 800mA in SEPIC Mode from Four NiCd Cells
Fixed Frequency Operation: 600kHz
Boost Converter Outputs up to 34V
Starts into Heavy Loads
Automatic Burst Mode
TM
Operation at
Light Load (LT1308A)
Continuous Switching at Light Loads (LT1308B)
Low V
CESAT
Switch: 300mV at 2A
Pin-for-Pin Upgrade Compatible with LT1308
Lower Quiescent Current in Shutdown: 1碌A (Max)
Improved Accuracy Low-Battery Detector
Reference: 200mV
鹵2%
The LT
廬
1308A/LT1308B are micropower, fixed frequency
step-up DC/DC converters that operate over a 1V to 10V
input voltage range. They are improved versions of the
LT1308 and are recommended for use in new designs. The
LT1308A features automatic shifting to power saving
Burst Mode operation at light loads and consumes just
140碌A at no load. The LT1308B features continuous
switching at light loads and operates at a quiescent current
of 2.5mA. Both devices consume less than 1碌A in
shutdown.
Low-battery detector accuracy is significantly tighter than
the LT1308. The 200mV reference is specified at
鹵2%
at
room and
鹵3%
over temperature. The shutdown pin
enables the device when it is tied to a 1V or higher source
and does not need to be tied to V
IN
as on the LT1308. An
internal V
C
clamp results in improved transient response
and the switch voltage rating has been increased to 36V,
enabling higher output voltage applications.
The LT1308A/LT1308B are available in the 8-lead SO and
14-lead TSSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIONS
s
s
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GSM/CDMA Phones
Digital Cameras
LCD Bias Supplies
Answer-Back Pagers
GPS Receivers
Battery Backup Supplies
Handheld Computers
TYPICAL APPLICATION
L1
4.7碌H
D1
5V
1A
SW
LBO
LT1308B
SHDN
V
C
47k
100pF
C1: AVX TAJC476M010
C2: AVX TPSD227M006
D1: IR 10BQ015
L1: MURATA LQH6N4R7
*R1: 169k FOR V
OUT
= 3.3V
887k FOR V
OUT
= 12V
FB
GND
R2
100k
R1*
309k
95
90
85
EFFICIENCY (%)
Converter Efficiency
V
IN
= 3.6V
V
IN
= 4.2V
+
Li-Ion
CELL
V
IN
C1
47碌F
SHUTDOWN
LBI
+
C2
220碌F
80
75
70
65
60
55
V
IN
= 1.5V
1308A/B F01
50
1
10
100
LOAD CURRENT (mA)
1000
1308A/B F01a
Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
V
IN
= 2.5V
1

LT1308ACF 產(chǎn)品屬性

  • LT1308A/B

  • 74

  • 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

  • 5V

  • 1 V ~ 10 V

  • 電流模式，混合

  • 600kHz

  • 1A

  • 無

  • 0°C ~ 70°C

  • 表面貼裝

  • 14-TSSOP（0.173"，4.40mm 寬）

  • 管件

  • 14-TSSOP

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