FEATURES
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LT3582/LT3582-5/LT3582-12
Boost and Single Inductor
Inverting DC/DC Converters with
Optional I
2
C Programing and OTP
DESCRIPTION
The LT
®
3582/LT3582-5/LT3582-12 are dual DC/DC converters
featuring positive and negative outputs and integrated feedback
resistors. The LT3582, with its built-in One Time Programming
(OTP), has configurable output settings via the I
2
C interface,
including output voltage settings, power-up sequencing,
power-down discharge, and output voltage ramp rates. LT3582
settings can be changed adaptively in the final product, or set
during manufacturing and made permanent using the built in
non-volatile OTP memory. The positive output voltage can be
set between 3.2V and 12.775V in 25mV steps. The negative
output voltage can be set between –1.2V and –13.95V in
–50mV steps. The LT3582-5 and LT3582-12 are pre-configured
at the factory for ±5V and ±12V outputs respectively, and as
such, don’t require the use of the I
2
C interface.
The LT3582 series includes two monolithic converters,
one Boost and one Inverting. The Boost converter has an
integrated power switch and output disconnect switch.
The Inverting converter uses a single inductor topology
and includes an integrated power switch. Both Boost
and Inverting converters use a novel** control scheme
resulting in low output voltage ripple while allowing for high
conversion efficiency over a wide load current range. The
LT3582 series is available in a 16-pin 3mm
×
3mm QFN.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
* Input thresholds are reduced to allow communication with low voltage digital ICs.
(See Electrical Characteristics).
** Patent Pending
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Output Voltages:
3.2V to 12.775V and –1.2V to –13.95V (LT3582)
5V and –5V (LT3582-5)
12V and –12V (LT3582-12)
Digitally Re-Programmable (LT3582) via I
2
C for:
Output Voltages
Power Sequencing
Output Voltage Ramp Rates
Power-Up Defaults Settable with Non-Volatile OTP
(LT3582)
I
2
C Compatible Interface (Standard Mode*)
All Power Switches Integrated
350mA Current Limit (Boost)
600mA Current Limit (Inverting)
All Feedback Resistors Integrated
Input Voltage Range: 2.55V to 5.5V
Low Quiescent Current
325μA in Active Mode
0.01μA in Shutdown Mode
Integrated Output Disconnect
Tiny 16-Pin 3mm
×
3mm QFN Package
AMOLED Power
CCD Power
General Purpose DC/DC Conversion
APPLICATIONS
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TYPICAL APPLICATION
±12V Supplies from a Single 5V Input
SWN
6.8μH
SWN
SHDN
V
IN
SWP
GND
LT3582
1μF
4.7μF
EFFICIENCY (%)
75
65
150
55
45
35
0.1
1
10
LOAD CURRENT (mA)
100
50
0
100
3582512 TA01b
Efficiency and Power Loss
95
6.8μH
INPUT
4.5V TO 5.5V
V
OUTP
V
OUTN
350
300
250
200
POWER LOSS (mW)
85
V
NEG
–12V
85mA
10μF
V
OUTN
SDA
SCL
CA
10nF
CAPP
CAPP
V
OUTP
V
PP
RAMPP RAMPN
10nF
3582512 TA01a
I
2
C
INTERFACE
OPTIONAL ON
LT3582-5/LT3582-12
V
POS
12V
80mA
4.7μF
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1
LT3582/LT3582-5/LT3582-12
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
GND
12 SWP
17
GND
11 CAPP
10 CAPP
9
5
V
IN
6
RAMPN
7
RAMPP
8
SHDN
V
OUTP
SDA
SCL
V
PP
V
IN
Voltage ..................................................................6V
SWP Voltage .............................................................15V
SWN Voltage ........................................................ –16.5V
CAPP Voltage ............................................................15V
CAPP-V
OUTP
Voltage .................................... –0.8V to 8V
I
CAPP-VOUTP
....................................................... ±300mA
V
OUTP
Voltage ...........................................................15V
V
OUTN
Voltage ...................................................... –16.5V
RAMPP Voltage ..........................................................3V
RAMPN Voltage ..........................................................3V
SHDN
Voltage ................................................ –0.5 to 6V
V
PP
Voltage ...................................................–0.2 to 16V
SDA, CA, SCL Voltage .................................... –0.5 to 6V
Operating Junction Temperature Range (Notes 3, 5)
LT3582E ............................................ –40°C to 125°C
Storage Temperature Range .............. –65°C to 150°C
16 15 14 13
CA 1
V
OUTN
2
SWN 3
SWN 4
UD PACKAGE
16-PIN (3mm × 3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 68°C/W
EXPOSED PAD (PIN #17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3582EUD#PBF
LT3582EUD-5#PBF
LT3582EUD-12#PBF
TAPE AND REEL
LT3582EUD#TRPBF
LT3582EUD-5#TRPBF
LT3582EUD-12#TRPBF
PART MARKING
LDDB
LDVG
LDVH
PACKAGE DESCRIPTION
16-Pin (3mm
×
3mm) Plastic QFN
16-Pin (3mm
×
3mm) Plastic QFN
16-Pin (3mm
×
3mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
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denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
SHDN
= V
IN
unless otherwise noted. (Note 3)
Switching Regulator Characteristics
SYMBOL
V
IN_MIN
V
IN_MAX
I
VIN
I
VIN_SHDN
I
CAPP_SHDN
T
OFF_MINP
T
OFF_MINN
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
V
IN
Quiescent Current
V
IN
Quiescent Current in Shutdown
CAPP Quiescent Current in Shutdown
Minimum Switch Off Time
Minimum Switch Off Time
Ramp Current Configured to 1μA,
SWOFF Bit Active
V
SHDN
= 0
V
SHDN
= 0, V
CAPP
= 5.0V, V
OUTP
= 0V
Boost Switch
Inverting Switch
CONDITIONS
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ELECTRICAL CHARACTERISTICS
MIN
2.4
5.5
TYP
2.475
325
0.01
0
100
125
MAX
2.55
450
0.5
0.5
UNITS
V
V
μA
μA
μA
ns
ns
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LT3582/LT3582-5/LT3582-12
ELECTRICAL CHARACTERISTICS
Switching Regulator Characteristics
SYMBOL
T
ON_MAX
I
LIMIT_P
I
LIMIT_N
R
ON_P
R
ON_N
I
OFF_P
I
OFF_N
R
ON_DIS
I
LIMIT_DIS
I
VOUTP_PDS
I
CAPP_PDS
I
VOUTN_PDS
T
START-UP
PARAMETER
Maximum Switch On-Time
Boost Switch Current Limit
Inverting Switch Current Limit
Boost Switch On-Resistance
Inverting Switch On-Resistance
Boost Switch Leakage Current into
SWP Pin
Inverting Switch Leakage Current Out of
SWN Pin
Output Disconnect Switch
On-Resistance
Output Disconnect Current Limit
V
OUTP
Power-Down Discharge Current
CAPP Power-Down Discharge Current
V
OUTN
Power-Down Discharge Current
Configuration Start-Up Delay
V
OUTP
= 8V
CAPP = 8V
V
OUTN
= –8V
V
IN
> V
IN_MIN
and
SHDN
> V
SHDN_VIH
to I
2
C
Enabled and Power-Up Sequencing Start
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The
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denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
SHDN
= V
IN
unless otherwise noted. (Note 3)
CONDITIONS
Inverting and Boost Switches
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MIN
285
490
TYP
10
350
600
500
560
0.01
0.01
1.4
MAX
430
720
UNITS
μs
mA
mA
mΩ
mΩ
I
SWP
= 200mA
I
SWN
= –400mA
V
SWP
= 5V
V
IN
= 5.0, V
SWN
= 0.0
V
CAPP
= 10V, RAMPP > 1.4V
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0.5
1
μA
μA
Ω
124
2.4
1.2
–1.4
155
4.8
2.4
–2.8
64
186
8.8
4.4
–4.2
128
mA
mA
mA
mA
μs
Programmable Output Characteristics (Note 6)
SYMBOL
V
VOUTP
N_V
OUTP
V
VOUTP_LSB
V
VOUTP_FS
V
VOUTP_MIN
V
VOUTP_LR
V
VOUTN
N_V
OUTN
V
VOUTN_LSB
V
VOUTN_FS
V
VOUTN_MIN
V
VOUTN_LR
INL_V
OUTP
DNL_V
OUTP
INL_V
OUTN
DNL_V
OUTN
I
RAMP00
I
RAMP01
PARAMETER
Positive Output Voltage
Positive V
OUTP
Resolution (Note 2)
V
OUTP
LSB (Note 2)
V
OUTP
Full-Scale Voltage (Note 2)
V
OUTP
Minimum Voltage (Note 2)
V
OUTP
Line Regulation
Negative Output Voltage
Negative V
OUTN
Resolution (Note 2)
V
OUTN
LSB (Note 2)
V
OUTN
Full-Scale Voltage (Note 2)
V
OUTN
Minimum Voltage (Note 2)
V
OUTN
Line Regulation
V
OUTP
Integral Nonlinearity (Notes 2, 4)
V
OUTP
Differential Nonlinearity (Notes 2, 4)
V
OUTN
Integral Nonlinearity (Note 2)
V
OUTN
Differential Nonlinearity (Note 2)
RAMPP/RAMPN Pull-Up Current
IRMP Code = 00
RAMPP/RAMPN Pull-Up Current (Note 2)
IRMP Code = 01
V
RAMPP
= 0.0V
V
RAMPN
= 0.0V
V
RAMPP
= 0.0V
V
RAMPN
= 0.0V
Code = FFh
Code = 00h
Code = FFh, 2.575 < V
IN
< 5.5
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CONDITIONS
LT3582-5
LT3582-12
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MIN
4.95
11.88
9
TYP
5
12
25
MAX
5.05
12.1
UNITS
V
V
Bits
mV
Code = BFh, V
PLUS
= 1
Code = 00h, V
PLUS
= 0
Code = BFh, 2.575 < V
IN
< 5.5
LT3582-5
LT3582-12
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12.56
3.152
–5.075
–12.1
8
12.775
3.20
–0.02
–5
–12
–50
12.94
3.248
–4.925
–11.868
V
V
%/V
V
V
Bits
mV
–14.2
–1.23
–13.95
–1.205
–0.01
–13.7
–1.18
±0.6
±0.6
±0.85
±0.85
V
V
%/V
LSB
LSB
LSB
LSB
μA
μA
0.7
1.4
1.0
2.0
1.3
2.6
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LT3582/LT3582-5/LT3582-12
ELECTRICAL CHARACTERISTICS
Programmable Output Characteristics
SYMBOL
I
RAMP10
I
RAMP11
V
VPLUS
PARAMETER
RAMPP/RAMPN Pull-Up Current (Note 2)
IRMP Code = 10
RAMPP/RAMPN Pull-Up Current (Note 2)
IRMP Code = 11
V
OUTP
Voltage Increase When V
PLUS
Bit is
Set from 0 to 1 (Note 2)
CONDITIONS
V
RAMPP
= 0.0V
V
RAMPN
= 0.0V
V
RAMPP
= 0.0V
V
RAMPN
= 0.0V
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The
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denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
SHDN
= V
IN
unless otherwise noted. (Note 3)
MIN
2.8
5.6
TYP
4.0
8.0
25
MAX
5.2
10.4
UNITS
μA
μA
mV
Input/Output Pin Characteristics
SYMBOL
V
SHDN_VIH
V
SHDN_VIL
V
HYST_SHDN
I
SHDN_BIAS
V
CA_VIH
V
CA_VIL
V
SDA_VIH
V
SDA_VIL
V
SCL_VIH
V
SCL_VIL
V
HYST
I
LEAK_CA
I
LEAK_SCL
I
LEAK_SDA
C
IN
V
SDA_OL
V
PP_RANGE
V
PPUVLO
PARAMETER
SHDN
Input Voltage High
SHDN
Input Voltage Low
SHDN
Input Hysteresis
SHDN
Pin Bias Current
CA Input Voltage High
CA Input Voltage Low
SDA Input Voltage High
SDA Input Voltage Low
SCL Input Voltage High
SCL Input Voltage Low
Input Hysteresis
CA Input Leakage Current
SCL Input Leakage Current
SDA Input Leakage Current
Input Capacitance
SDA Output Low Voltage
V
PP
Voltage Range for OTP Write (Note 2)
Undervoltage Lockout for V
PP
Pin (Note 2)
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CONDITIONS
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MIN
1.1
TYP
MAX
0.3
UNITS
V
V
mV
μA
V
V
V
V
V
V
mV
μA
μA
μA
pF
V
V
V
50
V
SHDN
= 1V
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2.5
0.7
×
V
IN
4.5
6.5
0.3
×
V
IN
1.25
0.85
1.25
0.85
80
±1
±1
±1
3
0.4
13
12.05
12.45
15
12.85
SDA, SCL Pins
CA = 0V and 5.5V
SCL = 0V and 5.5V
SDA = 0V and 5.5V
SDA, SCL Pins
3mA into SDA Pin
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C Timing Characteristics
SYMBOL
f
SCL
t
LOW
t
HIGH
t
BUF
t
HD,STA
t
SU,STA
t
SU,STO
t
HD,DATXMIT
t
HD,DATRCV
t
SU,DAT
t
F
PARAMETER
Serial Clock Frequency
Serial Clock Low Period
Serial Clock High Period
Bus Free Time Between Stop and Start
Start Condition Hold Time
Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time Transmitting
Data Hold Time Receiving
Data Setup Time
SDA Fall Time
400pF Load, V
IN
≥ 2.5V
LT3582 Sending Data to Host
LT3582 Receiving Data from Host
CONDITIONS
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MIN
4.7
4.0
4.7
4.0
4.7
4.0
300
0
250
TYP
MAX
100
UNITS
kHz
μs
μs
μs
μs
μs
μs
ns
ns
ns
250
ns
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LT3582/LT3582-5/LT3582-12
ELECTRICAL CHARACTERISTICS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
LT3582 only.
Note 3:
The LT3582E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlations with statistical process controls.
Note 4:
These specifications apply to the V
P
trim bits in REG0 using a
50mV LSB and do not include the additional V
PLUS
trim bit. See
Registers
and OTP
in the Applications Information section.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
Note 6:
Output voltage is measured under non-switching test conditions
approximating a moderate load current from the output.
3582512fb
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Analog electronics
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