LTC3589HUJ#PBF Linear Technology, LTC3589HUJ#PBF Datasheet
LTC3589HUJ#PBF
Specifications of LTC3589HUJ#PBF
Available stocks
Related parts for LTC3589HUJ#PBF
LTC3589HUJ#PBF Summary of contents
Page 1
... The device is available in a low profile 40-pin 6mm × 6mm exposed pad QFN package. L, LT, LTC, LTM, Burst Mode, 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
LTC3589/LTC3589-1 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Pin Configuration ................................................................................................................. 3 Order Information ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 9 Pin Functions ...
Page 3
... Storage Temperature Range .................. –65°C to 150°C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3589EUJ#PBF LTC3589EUJ#TRPBF LTC3589IUJ#PBF LTC3589IUJ#TRPBF LTC3589HUJ#PBF LTC3589HUJ#TRPBF LTC3589EUJ-1#PBF LTC3589EUJ-1#TRPBF LTC3589IUJ-1#PBF LTC3589IUJ-1#TRPBF LTC3589HUJ-1#PBF LTC3589HUJ-1#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ...
Page 4
LTC3589/LTC3589-1 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.8V. All regulators disabled unless otherwise noted. DD SYMBOL PARAMETER V Operating Input Supply Voltage Quiescent Current VINLDO1 IN f Oscillator Frequency OSC ...
Page 5
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.8V. All regulators disabled unless otherwise noted. DD SYMBOL PARAMETER LDO Regulators t Soft-Start Time LDO2, LDO3, LDO4 LDO_SS R Output Pull-Down Resistance LDO2, LDO3, LDO_PD LDO4 Always-On ...
Page 6
LTC3589/LTC3589-1 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.8V. All regulators disabled unless otherwise noted. DD SYMBOL PARAMETER LDO Regulator 4 (LDO4 Input Range (LTC3589) IN_LDO34 IN_LDO34 V Input Range (LTC3589-1) IN_LDO34 I ...
Page 7
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.8V. All regulators disabled unless otherwise noted. DD SYMBOL PARAMETER t Repeated Start Condition Set-Up Time SU_STA t Stop Condition Set-Up Time SU_STO t Data Hold Time Output ...
Page 8
LTC3589/LTC3589-1 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are 3.8V. All regulators disabled unless otherwise noted. DD SYMBOL PARAMETER RSTO Output Low Voltage V RSTO RSTO Output High Leakage Current I RSTO IRQ Output Low Voltage ...
Page 9
TYPICAL PERFORMANCE CHARACTERISTICS Standby VIN 2.5 3.0 3.5 4.0 4.5 5.0 V (V) IN 22554 G01 Step-Down Switching Regulator VIN IN 120 Burst Mode OPERATION ...
Page 10
LTC3589/LTC3589-1 TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Efficiency vs I OUT 100 V = 3.3V OUT 90 BURST PWM MODE 0.01 ...
Page 11
TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Switching Regulator Soft-Start V OUT 1V/DIV 500mA/DIV I L 100μs/DIV 3589 G19 Step-Down Switching Regulator 1 Load Step Burst Mode OPERATION V OUT 50mV/DIV I LOAD 1A/DIV 40μs/DIV 3589 G22 LOAD CAPACITANCE = 44μF LDO1 Dropout ...
Page 12
LTC3589/LTC3589-1 TYPICAL PERFORMANCE CHARACTERISTICS LDO2, LDO3, LDO4 Dropout Voltage vs Temperature 500 400 V = 1.2V LDO 300 V = 1.8V LDO 200 V = 3.3V 100 LDO 0 – 125 –50 75 100 TEMPERATURE (°C) 3589 ...
Page 13
PIN FUNCTIONS V (Pin 1): Power Input for LDO2. This pin should be IN_LDO2 bypassed to ground with a 1μF or greater ceramic capacitor. LDO2 (Pin 2): Output Voltage of LDO2. Nominal output voltage is set with a resistor feedback ...
Page 14
LTC3589/LTC3589-1 PIN FUNCTIONS ON (Pin 21): Pushbutton Input. A weak internal pull-up forces ON high when left fl oating. A normally open push- button is connected from ON to ground to force a low state on this pin. PBSTAT (Pin ...
Page 15
BLOCK DIAGRAM 25mA LDO1_STDBY LDO1_FB ALWAYS ON LDO1 IRQ ON (PB) PBSTAT CONTROL + SEQUENCE WAKE PWR_ON VSTB EN1 EN2 EN3 EN4 EN_LDO2 EN_LDO34 DV DD SDA SCL PGOOD RSTO V IN_LDO34 LDO4 ...
Page 16
LTC3589/LTC3589-1 OPERATION INTRODUCTION The LTC3589/LTC3589 complete power manage- ment solution for portable microprocessors and periph- eral devices. It generates a total of eight voltage rails for supplying power to the processor core, SDRAM, system memory, PC cards, always-on ...
Page 17
OPERATION The LTC3589/LTC3589-1 has fl exible options for enabling and sequencing the regulator enables. The regulators are 2 enabled using input pins or the I C serial port. To defi power-on sequence tie the enable of the fi ...
Page 18
LTC3589/LTC3589-1 OPERATION 0.8V – LDO1_STBY LDO1_FB 3589 F01 Figure 1. Always-On LDO Application Circuit LDO1_STBY is protected from short-circuits and over- loading LDO2 0.3625V TO 0.75V 5 DAC Figure 2. LDO2 Application Circuit 250mA ...
Page 19
OPERATION LDO Regulator 3 LDO3 is a fi xed 1.8V or 2.8V (LTC3589-1) output regula- tor. LDO3 is enabled by driving pin EN_LDO34 high or by writing command register OVEN[ Table 3 shows the I C command ...
Page 20
LTC3589/LTC3589-1 OPERATION A value of 10pF is recommended for most applications. Experimentation with capacitor sizes between 10pF and 33pF may yield improved transient response. Operating Modes The step-down switching regulators include three possible operating modes to meet the noise and ...
Page 21
OPERATION Table 5. Step-Down Switching Regulator 1 Command Register Settings COMMAND VALUE SETTING REGISTER[BIT] SCR1[1-0] 00* Pulse-Skipping Mode 01 Burst Mode Operation 10 Forced Continuous Mode OVEN[0] 0* Disable 1 Enable SCR2[0] 0* Wait for Output Below 300mV Before Enable ...
Page 22
LTC3589/LTC3589-1 OPERATION Table 7. Step-Down Switching Regulator 3 Command Register Settings COMMAND VALUE SETTING REGISTER[BIT] SCR1[5-4] 00* Pulse-Skipping Mode 01 Burst Mode Operation 10 Forced Continuous Mode OVEN[2] 0* Disable 1 Enable SCR2[2] 0* Wait for Output Below 300mV Before ...
Page 23
OPERATION An inductor with low DC resistance will improve converter effi ciency. Select an inductor with a DC current rating at least 1.5 times larger than the maximum load current to ensure the inductor does not saturate during normal operations. ...
Page 24
LTC3589/LTC3589-1 OPERATION Figure 4. Buck-Boost Switching Regulator Application Circuit Table 9. Inductors for Step-Down Switching Regulators 2 and 3 MANUFACTURERS Coilcraft Cooper Sumida CDRH5D16NP-4R7N CDRH38D16RHPNP-3R3M TDK VLF5014ST-2R2N2R3 VLCF5020T-2R7N2R2-1 VLCF5020T-3R3N2R0-1 TOKO Tokin Wurth 24 PV BB_OUT IN4 A D SW4AB SW4CD ...
Page 25
OPERATION Operating Modes 2 Table 10 shows the I C command registers used to control the operating modes of the LTC3589/LTC3589-1 buck-boost converter. When command register SCR1 bit 6 is LOW, the LTC3589 buck-boost switching regulator operates in a fi ...
Page 26
LTC3589/LTC3589-1 OPERATION Inductor Selection Inductor selection criteria for the buck-boost are similar to those given for the step-down switching regulators. The buck-boost converter is designed to work with inductors in the range of 1μH to 3.3μH. For most applications use ...
Page 27
OPERATION Capacitor Selection Low ESR ceramic capacitors should be used at both the output and input supply of the buck-boost switching regulator. Only X5R or X7R ceramic capacitors should be used because they retain their capacitance over wider voltage and ...
Page 28
LTC3589/LTC3589-1 OPERATION the odd bits of voltage change control register VCCR selects DAC output voltages V1 or V2, respectively. A slew of the DAC is initiated by writing even bit of ...
Page 29
OPERATION seconds, and 3) a fault condition is detected. Fault condi- tions are low V , device over temperature, or extended IN undervoltage of one of the regulator outputs. All regulator enables, the ON input, and PWR_ON signals are inhibited ...
Page 30
LTC3589/LTC3589-1 OPERATION ON(PB) PBSTAT 400ms WAKE <5 SEC μC/μP CONTROL PWR_ON Figure 6. Power-Up Using the Pushbutton <5 SEC ON(PB) 50ms PBSTAT WAKE μC/μP CONTROL PWR_ON Figure 7. Power Down Using Pushbutton ON(PB) PBSTAT 50ms - LTC3589 2ms - LTC3589-1 ...
Page 31
OPERATION WAKE 200μs 0. 200μs 0. 200μs LDO2 LDO3 LDO4 Figure 12. Pin-Strap Sequencing Timing Keep-Alive Operation For systems which require an active supply rail when in system standby, any of the three LTC3589/LTC3589-1 step-down switching ...
Page 32
LTC3589/LTC3589-1 OPERATION PGOOD Pin and PGSTAT Status Register Function Each LTC3589/LTC3589-1 regulator has an internal power good output that is active whenever the regulators feedback pin is closer than 7% (typical) from its input reference voltage. If any of the ...
Page 33
OPERATION Thermal Shutdown Fault and Warning Similar to the V undervoltage detection circuits the over- IN temperature detection circuits check for warning and fault levels. An overtemperature fault will initiate a fault induced shutdown. An overtemperature warning sets register bit ...
Page 34
LTC3589/LTC3589-1 OPERATION Bus Speed 2 The I C port operates at speeds up to 400kHz. It has built-in timing delays to ensure correct operation when 2 addressed from compliant master device. It also contains ...
Page 35
OPERATION pulls down the SDA line during the write acknowledge clock pulse so that stable LOW during the HIGH period of this clock pulse Slave Address The LTC3589/LTC3589-1 responds to factory programmed read and ...
Page 36
LTC3589/LTC3589-1 OPERATION Command and Status Registers Table 17 and Table 18 show the LTC3589/LTC3589-1 I command and status registers. System control register (SCR1) sets the operating modes of the switching regu- lators. Each step-down switching regulator has ...
Page 37
OPERATION Table 17. LTC3589 Command Register Table REG NAME B[7] B[6] 0x07 SCR1 Buck-Boost Mode Continuous 1 = Burst Mode 0x10 OVEN Software EN_LDO4 Control Mode Enable with Pin or OVEN Register 1 = Enable/ Disable ...
Page 38
LTC3589/LTC3589-1 OPERATION Table 17. LTC3589 Command Register Table REG NAME B[7] B[6] 0x21 CLIRQ 0x23 B1DTV1 Step-Down Switching Regulator Switch DV/DT Control 1ns 01 = 2ns 10 = 4ns 11 = 8ns 0x24 B1DTV2 Keep-Alive Phase Mode: Select: ...
Page 39
OPERATION Table 17. LTC3589 Command Register Table REG NAME B[7] B[6] 0x2A B3DTV2 Keep-Alive Phase Mode: Select Normal 0 = Clock Shutdown Phase Keep-Alive 1 = Clock Phase 2 0x32 L2DTV1 Keep-Alive Unused Mode: 0 ...
Page 40
LTC3589/LTC3589-1 OPERATION THERMAL CONSIDERATIONS AND BOARD LAYOUT Printed Circuit Board Power Dissipation In order to ensure optimal performance and the ability to deliver maximum output power to any regulator critical that the exposed ground pad on the backside ...
Page 41
OPERATION Printed Circuit Board Layout When laying out the printed circuit board, the following checklist should be followed to ensure proper operation of the LTC3589/LTC3589-1: 1. Connect the exposed pad of the package (Pin 41) directly to a large ground ...
Page 42
LTC3589/LTC3589-1 APPLICATIONS INFORMATION PXA16X Armada Processor Support LTC3589/LTC3589-1 includes spare register bits that can be accessed by the processor for setting and recalling hibernate and resume operation. The keep-alive function allow a step-down switching regulator to maintain system memory during ...
Page 43
TYPICAL APPLICATION V 10μ RTC 36 1.2V LDO1_STDBY 25mA 511k 1μF 35 LDO1_FB 1.02M LTC3589 18.2k V SRAM 9.09k 10k V SOC 10 10k EN1 11 EN2 13 WAKE EN3 9.09k 14 V EN4 CORE 9 EN_LDO2 10k ...
Page 44
LTC3589/LTC3589-1 PACKAGE DESCRIPTION 4.42 ±0.05 4.42 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 6.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (SEE NOTE 6) NOTE: 1. DRAWING IS A JEDEC ...
Page 45
... LTC3589-1 part added. Changes reflected throughout the data sheet 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. ...
Page 46
... GND 1μF 41 3589 TA03 Range: 1.8V to 5.5V, Buck-Boost Converter IN ≥ 3V, Dual 350mA Buck Regulators OUT , -3 Version for SiRF Atlas IV FLOAT . FLOAT LT 0211 REV C • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2010 22μ 1.2V 1.6A 604k 22μF 768k V B2 1.8V 1A 715k 22μF ...