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LT1106CF Datasheet

  • LT1106CF

  • Micropower Step-Up DC/DC Converter for PCMCIA Card Flash Mem...

  • 225.16KB

  • 8頁

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LT1106
Micropower Step-Up
DC/DC Converter for
PCMCIA Card Flash Memory
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
60mA Output Current at 12V from 3V Supply
Shutdown to 10碌A(chǔ)
Programmable 12V or 5V Output
Up to 85% Efficiency
Quiescent Current: 750碌A(chǔ)
Low V
CESAT
Switch: 300mV at 0.5A Typical
Uses Low Value, Thin, Surface Mount Inductors
Ultra-Thin 20-Lead TSSOP Package
APPLICATI
s
s
s
s
S
PCMCIA Card Flash Memory VPP Generator
Portable Computers
Portable Instruments
DC/DC Converter Module Replacements
The LT
廬
1106 is the industry鈥檚 first DC/DC converter
designed for use on Type I and Type II PCMCIA cards. The
device senses the VPP1 and VPP2 lines at the PCMCIA
socket and generates a regulated 12V, 60mA program-
ming supply if the socket does not provide it. Internal logic
simplifies the interface to PCMCIA card microcontrollers.
One input selects a 12V or 5V regulated output, while
another input controls micropower shutdown. Two logic
outputs indicate when the selected programming voltage
is valid and whether the input supply is 3.3V or 5V.
The regulator features Burst Mode
TM
operation with a 0.5A,
300mV switch for efficiency up to 85%. High frequency
500kHz switching permits the use of small value, flat
inductors that fit neatly on PCMCIA cards. The device
requires just 1碌F of output capacitance.
Quiescent current is 750碌A(chǔ) which drops to 350碌A(chǔ) when
the card runs off the socket supply. The shutdown pin
reduces supply current to only 10碌A(chǔ). The device includes
a soft start feature which limits supply current transients
when the card is inserted into a hot socket.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATI
12V, 60mA Flash Memory Programming Supply
V
CC
3.3V/5V
L1*
10碌H
86
D1**
84
+
EFFICIENCY (%)
4.7碌F
TANT
ALUM
0.1碌F
0.1碌F
V
CC
VPP1
G1
VPP2
G2
LT1106
VPP VALID
470pF
3/5 DETECT
3/5
SOFT START
ON/OFF
12/5
PGND GND
SW
AVPP
1碌F
VPP VALID
12V/60mA
VPP1
D
BSS84
S
VPP2
D
0.1碌F
BSS84
S
POWER ON
*DALE ILS-3825-01 OR
COILTRONICS CTX02-11238-3
**MOTOROLA MBR0530
1M
0.1碌F
LT1106 鈥?TA01
U
12V Output Efficiency
D1 = MBR0530
D1 = 4 BAT54Cs
IN PARALLEL
V
IN
= 5V
82
80
78
76
74
72
70
1
10
LOAD CURRENT (mA)
100
LT1106 鈥?TA02
UO
UO
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 3.3V
1

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