LT3582EUD-12#TRPBF Linear Technology, LT3582EUD-12#TRPBF Datasheet - Page 17

IC DC/DC CONV +/-12V 16-QFN

LT3582EUD-12#TRPBF

Manufacturer Part Number
LT3582EUD-12#TRPBF
Description
IC DC/DC CONV +/-12V 16-QFN
Manufacturer
Linear Technology
Type
Step-Up (Boost), Invertingr
Datasheet

Specifications of LT3582EUD-12#TRPBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
2
Voltage - Output
±12V
Current - Output
350mA, 600mA
Voltage - Input
2.55 ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-WQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT3582EUD-12#TRPBFLT3582EUD-12
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LT3582EUD-12#TRPBFLT3582EUD-12#PBF
Manufacturer:
LT
Quantity:
298
APPLICATIONS INFORMATION
Confi guration Lockout (LOCK bit)
After a desired confi guration is programmed into OTP , the
LOCK bit can be set to prohibit subsequent changes to the
confi guration. The LT3582-5 and LT3582-12 are precon-
fi gured with the LOCK bit set to a logic “1” which:
• Forces the chip to use the OTP confi guration only.
• Forces all I
• Prohibits any further programming of the OTP memory.
The LOCK OTP bit is set by programming a logic “1” into
bit 6 of OTP2. Regardless of the RSEL2 setting, I
of the LOCK bit always indicate the LOCKed or unlocked
state of the OTP memory.
OTP Programming (LT3582 only)
The LT3582 contains One Time Programmable non-vola-
tile memory to permanently store the chip confi guration.
Before programming, it’s recommended to set the SWOFF
bit to disable switching activity and prevent unexpected
chip behavior while the confi guration is being changed.
Programming involves the transfer of information from
the REG bytes to the OTP bytes. Therefore, valid data must
fi rst be written to the desired REG bytes. After the REG
bytes are written, they are selected by setting the cor-
responding RSEL bits in the CMDR. This forces the chip
into the desired confi guration and selects those bytes for
programming to OTP . After 15V has been applied to V
the WOTP bit is set in the CMDR to start the programming.
Finally, the WOTP bit is cleared to fi nish the programming.
An example programming algorithm is given below.
OTP programming draws about 3mA to 6mA per bit from
the V
ously (up to ~138mA), but it is recommended that one byte
data.
Any further attempts to program OTP leaves the OTP
memory unchanged and sets the FAULT bit in the
CMDR.
PP
pin. It is possible to program all 23 bits simultane-
2
C reads from addresses 0-2 to return OTP
2
C reads
PP
,
is programmed at a time to reduce noise on V
by the sudden change in current. A 1-10μF V
capacitor is also recommended to prevent voltage droop
after programming begins. Also, avoid hot-plugging V
which results in very fast voltage ramp rates and can lead
to excessive voltage on the V
Example OTP Programming Algorithm:
1. Apply 15V to the V
2. Write 50h to the CMDR. This disables the power
3. Write desired data to REG0-REG2.
4. Write 11h to the CMDR. This selects REG0 for pro-
5. Write 91h to the CMDR. This programs the REG0 data
6. Write 11h to the CMDR. This command can be sent im-
7. Read the CMDR and verify that the FAULT bit is not
8. Repeat steps 4-7 for the remaining bytes that need
9. Write 10h to the CMDR. This selects the OTP data for
10. Read the OTP data and verify the contents.
11. Write 00h to CMDR. This enables the power switches
12. Float the V
LT3582/LT3582-5/LT3582-12
time before step 5.
switches during programming by setting the SWOFF
bit in the CMDR. This also clears the FAULT bit.
gramming while keeping the switches off.
to OTP0.
mediately after step 5. This stops the programming.
set.
programming.
read verifi cation.
and the chip will operate from the OTP confi gura-
tion.
step 8.
PP
pin. This can be done at any time after
P-P
pin. This can be done at any
PP
pin.
PP
PP
17
caused
bypass
3582512fb
PP

Related parts for LT3582EUD-12#TRPBF