LT3582 LINER [Linear Technology], LT3582 Datasheet
LT3582
Available stocks
Related parts for LT3582
LT3582 Summary of contents
Page 1
... 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. ...
Page 2
... RAMPN Voltage ..........................................................3V SHDN Voltage .................................................–0 Voltage ...................................................–0.2 to 16V PP SDA, CA, SCL Voltage .....................................–0 Operating Junction Temperature Range (Notes 3, 5) LT3582E ............................................. –40°C to 125°C Storage Temperature Range .............. –65°C to 150°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT3582EUD#PBF LT3582EUD#TRPBF ...
Page 3
... SHDN_VIH IN IN_MIN Enabled and Power-up Sequencing Start CONDITIONS LT3582-5 LT3582- Code = BFh PLUS 2 Code = 00h PLUS Code = BFh, 2.575 < V < 5.5 IN LT3582-5 LT3582- Code = FFh 2 Code = 00h Code = FFh, 2.575 < V < 5 0.0V RAMPP V = 0.0V RAMPN ...
Page 4
... RAMPP V = 0.0V RAMPN PLUS CONDITIONS SHDN SDA, SCL Pins & 5.5V SCL = 0V & 5.5V SDA = 0V & 5.5V SDA, SCL Pins 3mA into SDA Pin 2 2 Pin PP CONDITIONS LT3582 Sending Data to Host unless otherwise noted. (Note 3) IN MIN TYP MAX l 2.8 4.0 5.2 l 5.6 8.0 10.4 25 MIN TYP MAX l 1 ...
Page 5
... 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 specifi cations from 0°C to 125°C junction temperature. Specifi cations 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 specifi ...
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 3 3 (V) IN 3582512 G04 V and V Pin Current ...
Page 7
... OUTP 60mA to 30mA Steps V OUTP 0.2V/DIV AC COUPLED LOAD CURRENT 20mA/DIV I L2 0.2A/DIV 50μs/DIV 3582512 G16 LT3582/LT3582-5/LT3582-12 Note: All waveforms on this page apply Switching Waveform at 10mA Load (Boost) V SWP 5V/DIV V VOUTP 10mV/DIV AC COUPLED I L2 0.2A/DIV 2μs/DIV 3582512 G11 ...
Page 8
... GND during shutdown. RAMPP (Pin 7): Soft start ramp pin for the Boost converter. Place a capacitor from this pin to GND. A programmable current of 1μA - 8μA (LT3582) or 1μA (LT3582-5/LT3582-12) charges this pin during startup, limiting the ramp rate This pin is discharged to GND in shutdown. ...
Page 9
... SWN SWN + – OUTN FBN – OTP – OTP ADJUST RAMPN OUTPUT SEQUENCING 2V OTP ADJUST RAMPP LT3582/LT3582-5/LT3582-12 S VARIABLE DELAY VARIABLE DELAY PEAK OFF PEAK OFF CONTROL CONTROL FBP – + VCN VCP 0.80V + 0.80V + 0.75V – ...
Page 10
... Output Power-Down Discharge: The power-down dis- charge feature is permanently enabled on the LT3582-5 and LT3582-12 and can be enabled or disabled through the LT3582. Upon SHDN falling, and when power- I down discharge is enabled, internal transistors will acti- vate to assist in discharging the outputs toward ground. ...
Page 11
... LT3582, write new ones. Most settings can be made permanent via the One-Time-Pro- grammable memory. The chip will always enable using the data stored in OTP and the LT3582 can be reconfi gured after power-up. START and STOP Conditions When the bus is idle, both SCL and SDA are high ...
Page 12
... S: START CONDITION P: STOP CONDITION 2 Figure Byte Write Transaction A byte of data is read from the LT3582 series using the format shown in Figure 3. This transaction requires four bytes to read one byte of chip data and must be repeated for each subsequent byte of data that is read. ...
Page 13
... 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 function as if the RSEL bits are always “0”. These bits perform three functions: • Each RSEL bit instructs the chip whether to use the confi ...
Page 14
... Proper uses of the bits in address 02h are discussed in the following sections. Setting the Output Voltages ( The LT3582 series contains two resistor dividers which are programmable in the LT3582, to set the output voltages. The positive output voltage V is adjustable in 25mV steps by setting the V REG0/OTP0 in addition to the V PLUS • ...
Page 15
... Once confi gured, the order in which V OUTP by the PUSEQ bits. The combinations available for the LT3582 are shown in Table 2. The LT3582-5/LT3582-12 are pre-confi gured with the 11 combination. voltage OUTP Table 2. Power-Up Sequences ...
Page 16
... This will initiate the desired power-up sequence that can be observed with an oscilloscope. Power-Down Discharge (PDDIS bit) The PDDIS bit is used to enable power down discharge. This bit is pre-confi gured to a “1” for the LT3582-5 and LT3582-12, thus enabling power-down discharge.Setting 16 PDDIS = 0 disables the power-down discharge causing the chip to shut down immediately after SHDN falls ...
Page 17
... APPLICATIONS INFORMATION Since the LT3582 series won’t power-down until both outputs are discharged (when power-down sequencing is enabled), make sure V & V OUTP OUTN This is not a problem in most topologies. However, read the section Output Disconnect Operating Limits for ad- ditional information. Confi guration Lockout (LOCK bit) After a desired confi ...
Page 18
... This can be done at any time PP after step 8. 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 manufacturer for more detailed information and for their entire selection of related parts, as many different sizes and shapes are available ...
Page 19
... Schottky diodes, with their low forward voltage drops and fast switching speeds, are recommended for use with the LT3582 series. The Diodes Inc. B0540WS is a very good choice in a small SOD-323 package. This diode is rated to handle an average forward current of 500mA and performs well across a wide temperature range ...
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 that the output load current doesn’t exceed the PMOS current limit. Exceeding the current limit causes a signifi ...
Page 21
... If the die temperature reaches approximately 147°C, the part will go into thermal lockout. In this event, the chip is reset which turns off the power switches and starts to discharge the RAMP capacitors. The part will be re-enabled when the die temperature drops by about 3.5°C. LT3582/LT3582-5/LT3582- Board Layout Considerations IN ...
Page 22
... LT3582/LT3582-5/LT3582-12 APPLICATIONS INFORMATION V OUTN GND V IN Figure 12: Suggested Component Placement (not to scale SCL SDA VPP C VPP (OPT OUTN SHDN VIAS TO GROUND PLANE UNDER PIN 17 REQUIRED TO IMPROVE THERMAL PERFORMANCE GROUND PLANE ...
Page 23
... LOAD CURRENT (mA) LT3582/LT3582-5/LT3582-12 ±5V Outputs from a Single 2.7V to 3.8V Input SHDN SWN SWN 6.8μH SWP GND LT3582 C2 10μF CAPP V OUTN CAPP SDA V OUTP SCL V INTERFACE PP CA RAMPP RAMPN ) C5 C6 22nF 22nF REG0/OTP0 = 24h D1-D2: DIODES INC ...
Page 24
... 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 LT3582-5 24 SHDN SWN SWN 6.8μH SWP GND D2 LT3582 C2 10μF CAPP V OUTN CAPP SDA V OUTP SCL RAMPP RAMPN ) C5 C6 22nF 22nF REG0/OTP0 = 24h D1-D2: DIODES INC. B0540WS-7 ...
Page 25
... LOAD CURRENT (mA) LT3582/LT3582-5/LT3582-12 12V and –5V Outputs from a Single 2.7V to 5.5V Input SHDN SWN SWN 6.8μH SWP GND LT3582 C2 10μF CAPP V OUTN CAPP SDA V OUTP SCL RAMPP RAMPN C5 C6 22nF 22nF REG0/OTP0 = B0h D1-D2: DIODES INC ...
Page 26
... V Ripple OUTP LOAD CURRENT (mA) Also See Typical Characteristics and Front Page for Additional Data 26 SHDN SWN SWN SWP 6.8μH GND LT3582 C2 4.7μF CAPP V OUTN CAPP SDA V OUTP SCL RAMPP RAMPN ) C5 C6 10nF 10nF REG0/OTP0 = B0h D1-D2: DIODES INC ...
Page 27
... 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 UD Package 16-Lead Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0 ...
Page 28
... LT3582/LT3582-5/LT3582-12 TYPICAL APPLICATION Tiny AMOLED Power Supply is 0.8mm (Max) Thin SHDN SWN SWN 1.5μH SWP GND LT3582 C2 10μF V CAPP NEG –5V V OUTN CAPP 90mA SDA V OUTP SCL V INTERFACE PP CA RAMPP RAMPN C5 C6 10nF 10nF REG0/OTP0 = 1Ch ...