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

LT3582EUD-12#TRPBF

Manufacturer Part NumberLT3582EUD-12#TRPBF
DescriptionIC DC/DC CONV +/-12V 16-QFN
ManufacturerLinear Technology
TypeStep-Up (Boost), Inverting
LT3582EUD-12#TRPBF datasheet
 


Specifications of LT3582EUD-12#TRPBF

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs2Voltage - Output±12V
Current - Output350mA, 600mAVoltage - Input2.55 ~ 5.5 V
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case16-WQFN Exposed PadLead Free Status / RoHS StatusLead free / RoHS Compliant
Power - Output-Frequency - Switching-
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FEATURES
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
Output Voltages
Power Sequencing
Output Voltage Ramp Rates
n
Power-Up Defaults Settable with Non-Volatile OTP
(LT3582)
2
n
I
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
Tiny 16-Pin 3mm × 3mm QFN Package
n
APPLICATIONS
n
AMOLED Power
n
CCD Power
n
General Purpose DC/DC Conversion
TYPICAL APPLICATION
±12V Supplies from a Single 5V Input
SHDN
SWN
SWN
V
6.8μH
SWP
GND
LT3582
10μF
V
CAPP
NEG
–12V
V
OUTN
CAPP
85mA
2
I
C
SDA
V
OUTP
INTERFACE
SCL
V
OPTIONAL ON
LT3582-5/LT3582-12
CA
RAMPP
RAMPN
10nF
10nF
LT3582/LT3582-5/LT3582-12
Boost and Single Inductor
Inverting DC/DC Converters with
2
Optional I
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 confi gurable output settings via the I
2
C for:
including output voltage settings, power-up sequencing,
power-down discharge, and output voltage ramp rates. LT3582
settings can be changed adaptively in the fi nal 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-confi gured
at the factory for ±5V and ±12V outputs respectively, and as
such, don’t require the use of the I
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 effi ciency 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
INPUT
IN
4.5V TO 5.5V
6.8μH
4.7μF
1μF
V
POS
12V
80mA
PP
4.7μF
3582512 TA01a
2
C interface,
2
C interface.
Effi ciency and Power Loss
95
350
V
OUTP
V
OUTN
300
85
250
75
200
65
150
55
100
45
50
0
35
0.1
1
10
100
LOAD CURRENT (mA)
3582512 TA01b
3582512fb
1

LT3582EUD-12#TRPBF Summary of contents

  • Page 1

    ... 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. ...

  • Page 2

    ... LT3582EUD#TRPBF LT3582EUD-5#PBF LT3582EUD-5#TRPBF LT3582EUD-12#PBF LT3582EUD-12#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T Switching Regulator Characteristics SYMBOL PARAMETER T Maximum Switch On-Time ON_MAX I Boost Switch Current Limit LIMIT_P I Inverting Switch Current Limit LIMIT_N R Boost Switch On-Resistance ON_P R Inverting Switch ...

  • Page 4

    LT3582/LT3582-5/LT3582-12 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T Programmable Output Characteristics SYMBOL PARAMETER I RAMPP/RAMPN Pull-Up Current (Note 2) RAMP10 IRMP Code = 10 I RAMPP/RAMPN Pull-Up Current (Note 2) RAMP11 IRMP Code = ...

  • Page 5

    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 ...

  • Page 6

    LT3582/LT3582-5/LT3582-12 TYPICAL PERFORMANCE CHARACTERISTICS Switching Frequencies (Figure 13) 10000 V OUTP 1000 V OUTN 100 LOAD CURRENT (mA) 3582512 G01 Quiescent Current – Not Switching 390 370 350 330 310 290 270 250 2.5 ...

  • Page 7

    TYPICAL PERFORMANCE CHARACTERISTICS Note: All waveforms on this page apply to Figure 13. Switching Waveform at 1mA Load (Boost) V SWP 5V/DIV V VOUTP 10mV/DIV AC COUPLED I L2 0.2A/DIV 3582512 G10 5μs/DIV Switching Waveform at 1mA Load (Inverting) V ...

  • Page 8

    LT3582/LT3582-5/LT3582-12 PIN FUNCTIONS 2 CA (Pin 1 Address Select Pin. Tie this pin to V the 7-bit address to 0110 001. Tie to GND for 1000 101. V (Pin 2): Negative Output Voltage Pin. When the con- OUTN ...

  • Page 9

    BLOCK DIAGRAM SWN SWN + – OUTN FBN – OTP – OTP ADJUST RAMPN OUTPUT SEQUENCING 2V OTP ADJUST RAMPP LT3582/LT3582-5/LT3582-12 S VARIABLE DELAY VARIABLE DELAY ...

  • Page 10

    LT3582/LT3582-5/LT3582-12 OPERATION The LT3582 series are dual DC/DC converters, each contain- ing both a Boost and an Inverting converter. Operation can be best understood by referring to the Block Diagram. The Boost and Inverting converters each use a novel control ...

  • Page 11

    APPLICATIONS INFORMATION Interface 2 The LT3582 series contains compatible interface allowing digitally confi gured. The use of this interface is optional for the LT3582-5 and LT3582-12 as these parts are pre-confi ...

  • Page 12

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION All data bytes can be read from their assigned register addresses. Since they share the same register addresses, reads of the OTP and REG data bytes are differentiated by their corresponding RSEL (Register Select) bits in the ...

  • Page 13

    APPLICATIONS INFORMATION CMDR: The Command Register is used to control various functions of the chip. During shutdown and power-up the CMDR is initialized to 00h. The RSEL (Register Select) bits are functional only for the LT3582. The LT3582-5 and LT3582-12 ...

  • Page 14

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION OTP2/REG2: Data in address 02h confi gures the output voltage sequencing, sets a fi ne voltage adjust for V and determines if further OTP programming is permitted or not. Proper uses of the bits in address 02h ...

  • Page 15

    APPLICATIONS INFORMATION several start-up issues have occurred: A) the expected V ramp up path is not followed B) inductor current OUTP ringing occurs C) the V ramp rate is limited due to OUTP the output disconnect current limit being reached ...

  • Page 16

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION tion voltage, the remaining output is activated and ramps under control of its respective RAMP pin (see Figure 8). The power-up sequencing concludes when both outputs have reached regulation. Evaluating PUSEQ Settings (LT3582 Only): After SHDN rises, ...

  • Page 17

    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 ...

  • Page 18

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION Choosing Inductors Several series of inductors that work well with the LT3582 series are listed in Table 3. This table is not complete, and there are many other manufacturers and parts that can be used. Consult each ...

  • Page 19

    APPLICATIONS INFORMATION Maximum Load Currents: Use one of the following equa- tions to estimate the maximum output load current for the positive and negative output voltages OUTP ⎛ ⎞ ⎛ + 0.5 – • (V ...

  • Page 20

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION Output Disconnect Operating Limits The LT3582 series has a PMOS output disconnect switch connected between CAPP and V OUTP operation, the switch is closed and current is internally limited to about 155mA (see Figure 9). Make sure ...

  • Page 21

    APPLICATIONS INFORMATION Note that the ripple voltage on V OUTP in this confi guration since the output disconnect PMOS, when not shorted, helps to create an RC fi lter at the output. Also, if the V pin is shorted to ...

  • Page 22

    LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION D1 V NEG –12V 85mA INTERFACE OPTIONAL ON V Ripple OUTP LOAD CURRENT (mA) Also See Typical Characteristics and Front Page for Additional Data 22 SHDN SWN SWN ...

  • Page 23

    TYPICAL APPLICATION V NEG –5V 100mA (V ≥ 2.7V) IN 125mA (V ≥ 3.3V) IN OPTIONAL ON Effi ciency and Power Loss, Load from 3. 0 LOAD ...

  • Page 24

    LT3582/LT3582-5/LT3582-12 TYPICAL APPLICATION ±5V Outputs from a Single 2.7V to 3.8V Input (Improved Effi ciency NEG –5V 100mA (V ≥ 2.7V) IN 125mA (V ≥ 3.3V) IN INTERFACE OPTIONAL ON 24 SHDN SWN SWN 6.8μH ...

  • Page 25

    TYPICAL APPLICATION V NEG –5V 100mA Effi ciency and Power Loss, Load from 3. 0 LOAD CURRENT (mA) LT3582/LT3582-5/LT3582-12 12V and –5V Outputs from a Single 2.7V ...

  • Page 26

    LT3582/LT3582-5/LT3582-12 PACKAGE DESCRIPTION 3.50 0.05 1.45 0.05 (4 SIDES) 2.10 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. DRAWING ...

  • Page 27

    ... C Interface Section Revised Typical Application Drawings Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT3582/LT3582-5/LT3582-12 ...

  • Page 28

    ... High Effi ciency Step-Up SW DC/DC Converter LT1946/LT1946A 1. 1.2/2.7MHz, High Effi ciency Step-Up DC/DC SW Converter ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 28 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 Effi ciency and Power Loss, Load from V INPUT 2 ...