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PDF LT1106CF Data sheet ( Hoja de datos )
| Número de pieza | LT1106CF | |
| Descripción | Micropower Step-Up DC/DC Converter for PCMCIA Card Flash Memory | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1106
Micropower Step-Up
DC/DC Converter for
PCMCIA Card Flash Memory
FEATURES
s 60mA Output Current at 12V from 3V Supply
s Shutdown to 10µA
s Programmable 12V or 5V Output
s Up to 85% Efficiency
s Quiescent Current: 750µA
s Low VCESAT Switch: 300mV at 0.5A Typical
s Uses Low Value, Thin, Surface Mount Inductors
s Ultra-Thin 20-Lead TSSOP Package
APPLICATI S
s PCMCIA Card Flash Memory VPP Generator
s Portable Computers
s Portable Instruments
s DC/DC Converter Module Replacements
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 ModeTM 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
VCC
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**
VCC
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
VIN = 5V
IN PARALLEL
82
VIN = 5V
80
VIN = 3.3V
78
76 VIN = 3.3V
74
72
70
1
10
LOAD CURRENT (mA)
100
LT1106 • TA02
1
1 page  
UU U
PI FU CTIO S
SELECT 12/5 (Pin 1): Tie to VIN or logic 1 for 5V output;
tie to GND or logic 0 for 12V output.
SOFT START (Pin 2): A 0.1µF/1MΩ parallel RC from this
pin to GND provides a Soft Start function upon device
turn-on. Initially about 80µA will flow from the pin into the
capacitor. When the voltage at the pin reaches approxi-
mately 0.4V, current ceases flowing out of the pin. See
Applications Information section.
VCC (Pins 3, 4): Input Supply. Both pins should be tied
together. At least 1µF input bypass capacitance is re-
quired. More capacitance reduces ringing on the supply
line.
3/5 (Pin 5): Supply Comparator Output. This pin provides
logic output indicating the value of the input supply. High
when VCC = 5V; low when VCC = 3.3V.
PGND (Pins 6, 7): Power Ground. Connect to ground plane.
VSW (Pins 9, 10, 11): Collector of Power Switch. High dV/
dt present on this pin. To minimize radiated noise keep
layout short and direct.
GND (Pin 13): Signal Ground. Connect of ground plane.
VPP VALID (Pin 14): This pin provides a logic signal
indicating that ouput voltage is greater than 11.4V. Active
low with internal 200k pull-up resistor.
LT1106
G1, G2 (Pins 16, 15): External MOSFET Gate Drives. When
VPP1 or VPP2 is greater than 11.7V, G1 or G2 is driven to
about 0.8V. When VPP1 or VPP2 is less than 11.7V, the
drives assume a high impedance state pulled up to the
AVPP pin through an internal 100k resistor.
VPP1, VPP2 (Pins 18, 17): Programming Power Inputs.
The LT1106 senses both VPP1 and VPP2 supplies at the
PCMCIA card socket. If VPP1 or VPP2 is greater than 11V,
the LT1106 operates in “Doze” Mode — the switching
regulator turns off and the drive to external P-channel
MOSFETs turns on. Supply current in Doze Mode is about
350µA. Input current into VPP1 and VPP2 is about 1µA
when the device is shut down.
AVPP (Pin 19): Output Sense Pin. This pin connects to a
1MΩ resistive divider that sets the output voltage. In
shutdown, the resistor string is disconnected and current
into this pin is reduced to < 1µA.
ON/OFF (Pin 20): Shutdown Control. When pulled below
1.5V, this pin disables the LT1106 and reduces supply
current to 10µA. All circuitry except the 3/5 comparator
is disabled in shutdown. The part is enabled when
ON/OFF is greater than 1.5V.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1106CF.PDF ] | |
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