LT3582 Datasheet, PDF (1/28 Pages) Linear Technology – I2C Programmable Boost and Single Inductor Inverting DC/DC Converters with OTP

FEATURES
LT3582/LT3582-5/LT3582-12
I²C Programmable Boost
and Single Inductor Inverting
DC/DC Converters with OTP
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 convert-
ers 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 –50mV steps. The
LT3582-5 and LT3582-12 are pre-configured at the factory
for ±5V and ±12V outputs respectively.
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 result-
ing 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 x 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
SWN
SHDN
SWN
6.8μH
V_IN
SWP
GND
LT3582
V_NEG
–12V
85mA
I²C
INTERFACE
10μF
V_OUTN
SDA
SCL
CAPP
CAPP
V_OUTP
V_PP
( ) OPTIONAL ON
LT3582-5/LT3582-12
CA _{RAMPP RAMPN}
10nF
10nF
6.8μH
1μF
INPUT
4.5V TO 5.5V
4.7μF
4.7μF
V_POS
12V
80mA
3582512 TA01a
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
3582512f
1