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LTC1559CS-5 Datasheet

  • LTC1559CS-5

  • Backup Battery Controller with Fixed Output

  • 20頁

  • LINER

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LTC1559-3.3/LTC1559-5
Backup Battery Controller
with Fixed Output
FEATURES
s
s
DESCRIPTION
The LTC
廬
1559 is a backup battery controller that provides
all the functions necessary to implement a backup 3.3V or
5V power supply using a single NiCd cell. It includes a 1.2V
to 3.07V/4.63V boost converter, an intelligent 2-stage
battery charger, automatic backup switching and a micro-
processor reset generator. The boost converter uses a
synchronous switching architecture to achieve a typical
efficiency of 70%, ensuring maximum backup lifetime
from a small NiCd cell.
The on-chip NiCd charger uses an internal gas gauge to
minimize fast recharge time and prevent overcharging of
the backup cell, thereby improving system efficiency and
extending the life of the backup cell. The LTC1559 also
provides a user programmable trickle charge current to
compensate for self-discharge losses in the backup cell.
The LTC1559鈥檚 automatic backup switching scheme
requires minimum intervention from the host system and
provides feedback to the host to minimize system loading
in the backup state. Its internal V
CC
fault detector and reset
generator eliminate the need for a separate microproces-
sor supervisory chip in most applications.
The LTC1559 is available in an SO-8, 16-pin GN or SO
package.
s
s
s
s
s
s
s
s
s
s
Complete Battery Backup System in an SO-8,
16-Pin GN or SO Package
Generates Fixed Backup Voltage (3.07V/4.63V) from
a Single 1.2V NiCd Button Cell
Automatic Main Supply to Backup Switching
Minimum 100mW Output Power
Automatic Fast Recharge of NiCd Battery
Programmable NiCd Trickle Charge Current
Smart NiCd Charger Minimizes Recharge Time and
Maximizes System Efficiency After Backup
Onboard Power-Up and Push-Button Reset
Generator
Performs V
CC
Supervisory Functions
Reset Assertion Guaranteed at V
CC
= 1V
Short-Circuit Protection
Thermal Limiting
APPLICATIONS
s
s
s
s
Notebook Computers
Palmtop Computers/PDAs
Portable Instruments
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
*L1
22碌H
**BACKUP
BATTERY
1.2V
NiCd
+
C1
1碌F
BACKUP TIME (MINUTES)
S1
RESET
1
8
R1
SW V
BAK
68k 2
7
V
CC
GND
3
CTL
LTC1559-3.3
6
BACKUP
4
5
PS
RESET
+
C2
1碌F
R2
100k
SYSTEM
碌P
MAIN
BATTERY
4.5V TO 28V
Q1
+
C3
P-MOSFET
100碌F
Si9424DY
V
OUT
10V
3.3V AT NORMAL MODE
* SUMIDA CD54-22碌H
3A
V
BAK
** PANASONIC P-11AAH
33mA (3.07V) AT BACKUP MODE
鈥?CONSULT LTC1435 DATA SHEET FOR
>33mA (3.3V) AT NORMAL MODE
1559 TA01
APPLICATION CIRCUIT INFORMATION
LTC1435
SYNCHRONOUS
BUCK
REGULATOR
鈥?/div>
U
U
U
Backup Time vs
V
BAK
Output Load Current
800
700
600
500
400
300
200
100
0
0
5
20
30
15
25
V
BAK
LOAD CURRENT (mA)
10
35
V
BAK
= 3.07V
NiCd CELL = P-11AAH
(110mA Hrs)
1559 TA02
1

LTC1559CS-5 產(chǎn)品屬性

  • LTC1559-3.3/-5

  • 50

  • 集成電路 (IC)

  • PMIC - 電池管理

  • -

  • 備份管理

  • 鎳鎘

  • 4.4 V ~ 5.5 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC

  • 管件

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