LT3582_15 Datasheet, PDF (1/28 Pages) Linear Technology – Boost and Single Inductor Inverting DC/DC Converters with Optional I2C Programing and OTP

LT3582/LT3582-5/LT3582-12
Boost and Single Inductor
Inverting DC/DC Converters with
Optional I²C Programing and OTP
FEATURES
DESCRIPTION
n _{Output Voltages:}
3.2V to 12.775V and –1.2V to –13.95V (LT3582)
5V and –5V (LT3582-5)
12V and –12V (LT3582-12)
n _{Digitally Re-Programmable (LT3582) via I}²_{C for:}
Output Voltages
Power Sequencing
Output Voltage Ramp Rates
n _{Power-Up Defaults Settable with Non-Volatile OTP}
(LT3582)
n _I²_{C Compatible Interface (Standard Mode*)}
n _{All Power Switches Integrated}
350mA Current Limit (Boost)
600mA Current Limit (Inverting)
n _{All Feedback Resistors Integrated}
n _{Input Voltage Range: 2.55V to 5.5V}
n _{Low Quiescent Current}
325μA in Active Mode
0.01μA in Shutdown Mode
n _{Integrated Output Disconnect}
n _{Tiny 16-Pin 3mm × 3mm QFN Package}
APPLICATIONS
n _{AMOLED Power}
n _{CCD Power}
n _{General Purpose DC/DC Conversion}
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 I²C 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
–50mVsteps.TheLT3582-5andLT3582-12arepre-configured
at the factory for ±5V and ±12V outputs respectively, and as
such, don’t require the use of the I²C 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
TYPICAL APPLICATION
±12V Supplies from a Single 5V Input
6.8μH
SWN
SWN
SHDN
V_IN
SWP
6.8μH
INPUT
4.5V TO 5.5V
V_NEG
–12V
85mA
I²C
 INTERFACE
OPTIONAL ON
LT3582-5/LT3582-12
10μF
GND
LT3582
V_OUTN
SDA
CAPP
CAPP
V_OUTP
SCL
V_PP
CA _{RAMPP RAMPN}
3582512 TA01a
4.7μF
1μF
4.7μF
V_POS
12V
80mA
10nF
10nF
Efficiency and Power Loss
95
350
V_OUTP
V_OUTN
85
300
250
75
200
65
150
55
100
45
50
35
0.1
1
10
LOAD CURRENT (mA)
0
100
3582512 TA01b
3582512fb
1