LT1106_02 Datasheet, PDF (1/8 Pages) Linear Technology – Micropower Step-Up DC/DC Converter for PCMCIA Card Flash Memory

OBSOLETE:
FOR INFORMATION PURPOSES ONLY
Contact Linear Technology for Potential Replacement
FEATURES
I _{60mA Output Current at 12V from 3V Supply}
I _{Shutdown to 10µA}
I _{Programmable 12V or 5V Output}
I _{Up to 85% Efficiency}
I _{Quiescent Current: 750µA}
I _{Low VCESAT Switch: 300mV at 0.5A Typical}
I _{Uses Low Value, Thin, Surface Mount Inductors}
I _{Ultra-Thin 20-Lead TSSOP Package}
APPLICATI S
I _{PCMCIA Card Flash Memory VPP Generator}
I _{Portable Computers}
I _{Portable Instruments}
I _{DC/DC Converter Module Replacements}
LT1106
Micropower Step-Up
DC/DC Converter for
PCMCIA Card Flash Memory
DESCRIPTIO
The LT^®1106 is the industry’s 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 1µF of output capacitance.
Quiescent current is 750µA which drops to 350µA when
the card runs off the socket supply. The shutdown pin
reduces supply current to only 10µA. 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 +
VPP1
VPP2
4.7µF
TANT
ALUM
0.1µF
0.1µF
D
BSS84
S
0.1µF ^D
BSS84
S
POWER ON
*DALE ILS-3825-01 OR
COILTRONICS CTX02-11238-3
**MOTOROLA MBR0530
L1*
10µH
D1**
V_CC
VPP1
SW
AVPP
G1 LT1106
VPP2 VPP VALID
G2
3/5 DETECT
SOFT START
ON/OFF
PGND GND 12/5 _1M
1µF
470pF
12V/60mA
VPP VALID
3/5
0.1µF
LT1106 • TA01
12V Output Efficiency
86
84
D1 = MBR0530
D1 = 4 BAT54Cs
V_IN = 5V
IN PARALLEL
82
V_IN = 5V
80
V_IN = 3.3V
78
76
V_IN = 3.3V
74
72
70
1
10
LOAD CURRENT (mA)
100
LT1106 • TA02
1