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LT3692

3692fa

For more information www.linear.com/3692

Typical applicaTion

FeaTures

applicaTions

DescripTion

Monolithic Dual Tracking

3.5A Step-Down

Switching Regulator

The LT

3692 is a dual current mode PWM step-down

DC/DC converter with two internal 3.8A switches. Indepen-

dent input voltage, shutdown, feedback, soft-start, current

limit and comparator pins for each channel simplify com-

plex power supply tracking and sequencing requirements.

o optimize efficiency and component size, both convert-

ers have a programmable maximum current limit and are

synchronized to either a common external clock input,

or a resistor settable fixed 250kHz to 2.25MHz internal

oscillator

. A frequency divider is provided for channel 1

to further optimize component size. At all frequencies, a

180° phase relationship between channels is maintained,

reducing voltage ripple and component size. A clock output

is available for synchronizing multiple regulators.

Minimum input to output voltage ratios are improved by

allowing the switch to stay on through multiple clock cycles

only switching off when the boost capacitor needs recharg

ing. Independent channel operation can be programmed

using the SHDN pin. Disabling both converters reduces

the total quiescent to <10µA.

Dual 1.8V/3.5A and 5V/3.5A Step-Down Converter

Wide Input Range:

– Operation from 3V to 36V

– OVLO Protects Circuit Through 60V Transients

Independent Supply, Shutdown, Soft-Start,

Programmable Current Limit and Programmable

Power Good for Each 3.5A Regulator

Die Temperature Monitor

Adjustable/Synchronizable Fixed Frequency

Operation from 250kHz to 2.25MHz with

Synchronized Clock Output

Independent Synchronized Switching Frequencies

Optimize Component Size

Antiphase Switching

Outputs Can Be Paralleled

Flexible Output Voltage Tracking

Enhanced Short-Circuit Protection

Low Dropout: 95% Maximum Duty Cycle

5mm × 5mm QFN Package

Automotive Supplies

Distributed Supply Regulation

BST1

SW1V

OUT2

OUT1

CMPI1

CMPO1

SS1

ILIM1

RT/SYNC

DIV

FB1

IND1

SW2

OUT2

CMPI2

CMPO2

SS2

ILIM2

SS2

ILIM2

CLKOUT

FB2

IND2

0.47µF

4.7µF

×2

100µF

×2

680pF

33pF

8.06k

13.0k

17.8k

60.4k

47pF

0.1µF

3692 TA01a

36.5k

CLOCKOUT

500kHz

0.1µF

330pF

60.4k

6V TO 32V

OUT1

1.8V 3.5A

500kHz/

250kHz

6.8µH

BST2

SHDN1 SHDN2

IN1

LT3692

GND

IN2

47µF

1µF

42.2k

100k

PG2

10k

143k

7.15k

OUT2

5V 3.5A

500kHz

6.8µH

Independent Synchronized Switching Frequencies

Extend Full Frequency Input Range

CLKOUT

SW1

SW2

1µs/DIVV

= 12V

3692 TA01b

CLKOUT

SW1

SW2

1µs/DIVV

= 24V

3692 TA01c

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.

Summary of content (36 pages)

PAGE 1
LT3692 Monolithic Dual Tracking 3.5A Step-Down Switching Regulator Description Features n n n n n n n n n n n Wide Input Range: – Operation from 3V to 36V – OVLO Protects Circuit Through 60V Transients Independent Supply, Shutdown, Soft-Start, Programmable Current Limit and Programmable Power Good for Each 3.5A Regulator Die Temperature Monitor Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.
PAGE 2
LT3692 SS1 VIN1 SW1 DNC* IND1 DNC* TOP VIEW VOUT1 32 31 30 29 28 27 26 25 BST1 1 24 ILIM1 CMPO1 2 23 VC1 22 RT/SYNC CMPI1 3 FB1 4 21 CLKOUT 33 GND FB2 5 20 TJ CMPI2 6 19 DIV CMPO2 7 18 VC2 17 ILIM2 BST2 8 SS2 SHDN2 VIN2 SW2 DNC* 9 10 11 12 13 14 15 16 IND2 VIN1/2, SHDN1/2, CMPO1/2............................. 40V/–0.3V VIN1/2 Transient (Note 2)................................. 60V/–0.3V SW1/2.....................................................................VIN1/2 BST1/2.......
PAGE 3
LT3692 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VVIN1/2 = 15V unless otherwise specified. (Note 3) PARAMETER CONDITIONS Feedback Voltage Regulation VVIN1/2 = 3 to 40V, VVC1/2 = 0.6 to 1.6V Feedback Voltage Offset Ch 1 to Ch 2 VVC1/2 = 1V Feedback Bias Current Ch 1/2 VFB1/2 = 0.
PAGE 4
LT3692 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VVIN1/2 = 15V unless otherwise specified.
PAGE 5
LT3692 Typical Performance Characteristics 50 3.5 39.5 VIN = 15V VSHDN = 15V 40 2.5 2.0 SHUTDOWN THRESHOLD VOLTAGE 1.5 25 20 0 0 –50 –25 25 50 75 100 125 150 TEMPERATURE (°C) 0 35.0 –50 –25 6000 10 9 5000 FB Voltage and CH1-CH2 FB Offset vs Temperature 820 VSHDN1 = VSHDN2 = 0V 2000 125°C FEEDBACK VOLTAGE (V) CURRENT (µA) –50°C IQ1 6 5 4 3 2 1000 0.2 0.4 1 0.6 0.8 VOLTAGE (V) 1.2 0 –50 –25 1.4 3692 G04 0.
PAGE 6
LT3692 Typical Performance Characteristics Comparator Sink Current vs Temperature Comparator Thresholds vs Temperature 750 400 740 RISING THRESHOLD CURRENT (µA) 700 690 680 0 200 150 1200 800 600 400 0 CLKOUT-to-SW1 Delay vs Temperature RT/SYNC-to-CLKOUT and SW1 Delay vs Temperature 400 191 140 350 189 130 187 120 DELAY (ns) 450 150 DELAY (ns) 160 193 110 100 200 150 179 80 100 177 70 50 60 –50 –25 0 MAXIMUM RT/SYNC DUTY CYCLE ÷4 1.0 0.8 ÷2 0.
PAGE 7
LT3692 Typical Performance Characteristics Switch Peak Current vs Temperature 5.0 90 4.5 80 4.0 70 3.5 3A 50 40 30 10 0 –50 –25 0 2.50 3.0 VILIM = 0.5V 2.5 VILIM = 0V 1.5 0 –50 –25 0 90 2500 Efficiency, TJ vs Load Current 88 EFFICIENCY 84 20 82 TJ 80 30 40 50 60 RESISTANCE (kΩ) 70 80 90 78 VIN = 12V VOUT = 5V FREQ = 1MHz 0 0.5 1 1.5 2 2.5 3 LOAD CURRENT (A) Efficiency, TJ vs Load Current 3.5 30 72 20 VIN = 12V VOUT = 2.5V FREQ = 1MHz 1 1.5 2 2.
PAGE 8
LT3692 Pin Functions BST1/2: The BST pin provides a higher than VIN base drive to the power NPN to ensure a low switch drop. If the voltage between the BST pin and the VIN pin is less than the voltage required to fully turn on the power NPN, the power switch is turned off to recharge the BST capacitor. CMPI1/2: The CMPI pin is an input to a comparator with a threshold of 720mV and 60mv of hysteresis.
PAGE 9
LT3692 pin functions SHDN1/2: The shutdown pin is used to control each channel’s operation. In addition to controlling channel 1, the SHDN1 pin also activates control circuitry for both channels and must be present for channel 2 to operate. When SHDN1 is below its threshold, switching on both channels is halted. Further reducing the SHDN1 voltage to 0.6V reduces the quiescent current to a typical value of 6µA. If the shutdown features are not used, the SHDN pin can be tied to VIN.
PAGE 10
LT3692 Block Diagram VIN1 1.3V SHDN1 + – + – VIN1 38V CHANNEL 1 THERMAL SHUTDOWN 2.5V 12µA SS1 S – + 90mV – + S PRE PRE Q R DROPOUT ENHANCEMENT BST1 DRIVER CIRCUITRY SW1 + – Q R IND1 VOUT1 VC1 R1 FB1 2.5V ILIM1 RLIM CMPI1 12µA SLOPE COMPENSATION 2.5V 0.72V CMPO1 + – TJ CLK1 2.5V DIV 0.806V 12µA RT/SYNC R3 + + – R2 12µA OSCILLATOR AND AGC MASTER CLOCK VIN1 CLK2 TO CHANNEL 2 2.8V + – INTERNAL REGULATOR AND REFERENCES 2.5V CLKOUT GND RDIV 3692 F01 Figure 1.
PAGE 11
LT3692 Applications Information In addition, the internal slope compensation will be automatically adjusted to prevent subharmonic oscillation during synchronization. In either mode of oscillator operation, a square wave with the master clock frequency, synchronized to channel 1 is present at the CLKOUT pin. The two regulators are constant frequency, current mode step-down converters.
PAGE 12
LT3692 Applications Information A comparator with a threshold of 720mV and 60mV of hysteresis is provided for detecting error conditions. The CMPO output is an open-collector NPN that is off when the CMPI pin is above the threshold allowing a resistor to pull the CMPO pin to a desired voltage. The voltage present at the TJ pin is proportional to the junction temperature of the LT3692. The TJ pin will be 250mV for a die temperature of 25°C and will have a slope of 10mV/°C.
PAGE 13
LT3692 Applications Information Table 2. Efficiency and Size Comparisons for Different RRT/SYNC Values, 3.3V Output FREQUENCY RT/SYNC EFFICIENCY VVIN1/2 = 12V VIN(MAX)† L* C* C + L (Area) 250kHz 5.90kΩ 77.8% 38V 12µH 120µF 59.8mm2 500kHz 13.0kΩ 81.2% 31V 6.8µH 60µF 54.6mm2 1000kHz 28.0kΩ 80.5% 16V 3.3µH 30µF 51.9mm2 1500kHz 44.2kΩ 79.3% 10V 1.5µH 22µF 46.9mm2 2250kHz 71.5kΩ 76.7% 6.5V 0.82µH 15µF 19.
PAGE 14
LT3692 Applications Information The maximum input voltage is determined by the absolute maximum ratings of the VIN and BST pins and by the frequency and minimum duty cycle. The minimum duty cycle is defined as: DCMIN = tON(MIN) • Frequency Maximum input voltage as: VIN(MAX) = VOUT + VD – VD + VSW DCMIN Example: Note that the LT3692 will regulate if the input voltage is taken above the calculated maximum voltage as long as maximum ratings of the VIN and BST pins are not violated.
PAGE 15
LT3692 Applications Information can be set between 2A and 4.8A for each channel via a resistor from the ILIM pin to ground. The ILIM pin is driven by a 12µA current source. Setting resistor R LIM sets the voltage present at the ILIM pin which determines the maximum switch current as illustrated in Figure 6. A capacitor from the ILIM pin to ground, or a resistor divider from the output, can be used to limit the peak current during start-up.
PAGE 16
LT3692 Applications Information You can also use electrolytic capacitors. The ESRs of most aluminum electrolytics are too large to deliver low output ripple. Tantalum and newer, lower ESR organic electrolytic capacitors intended for power supply use, are suitable and the manufacturers will specify the ESR. The choice of capacitor value will be based on the ESR required for low ripple.
PAGE 17
LT3692 Applications Information D2 VIN VIN BST C3 D2 VIN SW VIN LT3692 GND (7b) D2 VX > VIN + 3V VIN BST C3 VIN SW LT3692 BST VIN SW LT3692 IND VOUT VBST – VSW = VX VBST(MAX) = VIN + VX VX(MIN) = 3V VOUT < 3V GND VBST – VSW = VIN VBST(MAX) = 2 • VIN D2 VIN SW IND VOUT VOUT (7a) VX = LOWEST VIN OR VOUT > 3V C3 LT3692 IND VOUT VBST – VSW = VOUT VBST(MAX) = VIN + VOUT BST IND VOUT VOUT < 3V GND (7c) VOUT < 3V GND VBST – VSW = VX VBST(MAX) = VX VX(MIN) = VIN + 3V 3692 F0
PAGE 18
LT3692 Applications Information Loop compensation determines the stability and transient performance. Designing the compensation network is a bit complicated and the best values depend on the application and in particular the type of output capacitor. A practical approach is to start with one of the circuits in this data sheet that is similar to your application and tune the compensation network to optimize the performance.
PAGE 19
LT3692 Applications Information If the synchronization signal powers up in an undetermined state (VOL, VOH, Hi-Z), connect the synchronization clock to the LT3692 as shown in Figure 9. The circuit as shown will isolate the synchronization signal when the output voltage is below 90% of the regulated output. The LT3692 will start up with a switching frequency determined by the resistor from the RT/SYNC pin to ground.
PAGE 20
LT3692 Applications Information Shutdown and Undervoltage/Overvoltage Lockout Typically, undervoltage lockout (UVLO) is used in situations where the input supply is current limited, or has a relatively high source resistance. A switching regulator draws constant power from the source, so source current increases as source voltage drops. This looks like a negative resistance load to the source and can cause the source to current limit or latch low under low source voltage conditions.
PAGE 21
LT3692 Applications Information As the SS pin voltage rises above 90mV, the VC pin is released and the output is regulated to the SS voltage. When the SS pin voltage exceeds the internal 0.806V reference, the output is regulated to the reference. The SS pin voltage will continue to rise until it is clamped at 2V. The comparators can be used to monitor input and output voltages as well as die temperature. See the Typical Applications circuit collection for examples.
PAGE 22
LT3692 Applications Information Independent Start-Up Ratiometric Start-Up Absolute Start-Up VOUT1 0.5V/DIV VOUT1 0.5V/DIV PG1 VOUT2 0.5V/DIV VOUT2 0.5V/DIV 5ms/DIV LT3692 FB1 CMPI1 0.72V + – 0.1µF CMPO1 12µA 0.72V + – FB1 CMPI1 2.5V 12µA 0.72V SS1 R2 2.5V PG2 12µA 0.72V SS2 12µA PG1 0.72V + – R4 R5 FB2 CMPI2 2.5V PG2 12µA 0.72V SS2 R8 0.22µF (16a) PG1 VOUT2 R6 CMPO2 R3 R2 CMPO1 + – 0.1µF R4 FB2 CMPI2 FB1 CMPI1 2.
PAGE 23
LT3692 Applications Information Single Step Down: Application Optimization In multiple channel applications requiring large VIN to VOUT ratios, the maximum frequency and resulting inductor size is determined by the channel with the largest ratio. The LT3692’s multi-frequency operation allows the user to minimize component size for each channel while maintaining constant frequency operation. The circuit in Figure 17 illustrates this approach.
PAGE 24
LT3692 Applications Information VIN 5V TO 36V 4.7µF 4.7µF VIN2 VIN1 SHDN1 BST1 8.2µH 0.47µF SHDN2 BST2 SW1 SW2 IND1 IND2 8.2µH 0.47µF LT3692 VOUT1 1.8V 3A 200kHz VOUT2 VOUT1 100µF ×3 8.06k 100pF 10k FB1 FB2 CMPI1 CMPI2 CMPO1 CMPO2 SS1 ILIM2 VC2 RT/SYNC 680pF DIV 10k 10.2k CLKOUT TJ GND 33pF 120k 100k 8.06k PG SS2 ILIM1 VC1 0.1µF 100µF 100pF 24.9k VOUT2 3.3V 3A 400kHz CLOCKOUT 400kHz 0.1µF 62k 470pF 0.1µF 33pF 49.9k 16.5k 120k 3692 F17 Figure 17. 3.
PAGE 25
LT3692 Applications Information Shorted and Reverse Input Protection PCB Layout If the inductor is chosen so that it won’t saturate excessively, an LT3692 step-down regulator will tolerate a shorted output. There is another situation to consider in systems where the output will be held high when the input to the LT3692 is absent. This may occur in battery charging applications or in battery back-up systems where a battery or some other supply is diode OR-ed with the LT3692’s output.
PAGE 26
LT3692 Applications Information The power dissipation in the other power components such as catch diodes, boost diodes and inductors, cause additional copper heating and can further increase what the IC sees as ambient temperature. See the LT1767 data sheet’s Thermal Considerations section. Die Temperature and Thermal Shutdown The LT3692 TJ pin outputs a voltage proportional to the internal junction temperature. The TJ pin typically outputs 250mV for 25°C and has a slope of 10mV/°C.
PAGE 27
LT3692 Applications Information As a safeguard, the LT3692 has an additional thermal shutdown threshold set at a typical value of 163°C for each channel. Each time the threshold is exceeded, a power on sequence for that channel will be initiated. The sequence will then repeat until the thermal overload is removed. It should be noted that the TJ pin voltage represents a steady-state temperature and should not be used to guarantee that maximum junction temperatures are not exceeded.
PAGE 28
VIN 7V TO 36V 28 VOUT1 5V 2A 500kHz 8.06k 100pF 0.47µF For more information www.linear.com/3692 120k 0.1µF 33pF 47µF ×2 4.7µF 36.5k 28.0k 330pF 42.2k 8.2µH VIN2 62k DIV GND 0.1µF TJ CLKOUT ILIM1 VC1 RT/SYNC SS2 ILIM2 VC2 SS1 CMPO2 CMPO1 FB2 VOUT2 CMPI2 LT3692 IND2 SW2 SHDN2 BST2 CMPI1 FB1 VOUT1 IND1 SW1 SHDN1 BST1 VIN1 49.9k 33pF 16.9k 2.2µH 25.5k 330pF 100pF 0.22µF 8.06k 4.7µF 49.9k PG 100k 8.06k 10k CLOCKOUT 1MHz 0.1µF 47µF VOUT2 2.5V 1A 1MHz 8.
PAGE 29
LT3692 TYPICAL APPLICATIONS 3.3V and 1.8V 2-Stage Dual Step-Down Multi-Frequency Converter VIN 5V TO 36V 4.7µF SHDN1 BST1 8.2µH 0.47µF 1µF VIN2 VIN1 SHDN2 BST2 SW1 SW2 IND1 IND2 1µH 0.22µF LT3692 VOUT1 3.3V 2.5A 400kHz 100µF 100pF 24.9k 8.06k FB1 FB2 CMPI1 CMPI2 CMPO1 CMPO2 SS1 0.1µF 16.5k ILIM2 VC2 RT/SYNC DIV 47.5k CLKOUT TJ GND 33pF 120k 10k 100pF 100k 8.06k PG SS2 ILIM1 VC1 470pF VOUT2 1.8V 1A 47µF 1600kHz VOUT2 VOUT1 0.1µF CLOCKOUT 1600kHz 33pF 49.
PAGE 30
LT3692 TYPICAL APPLICATIONS 3.3V/6A Single Output with UVLO and 100°C Temperature Warning VIN 6V TO 30V 4.7µF 4.7µF 80.6k VIN2 VIN1 6.5V UVLO RISING 6V UVLO FALLING SHDN1 BST1 10k 6.8µH 0.22µF SHDN2 BST2 SW1 SW2 IND1 IND2 6.8µH 0.22µF VOUT 3.3V 6A 800kHz EFFECTIVE RIPPLE LT3692 VOUT VOUT2 VOUT1 47µF 100pF 8.06k 24.9k FB1 FB2 CMPI1 CMPI2 CMPO1 SS1 CMPO2 SS2 ILIM2 VC2 ILIM1 VC1 0.1µF RT/SYNC 680pF DIV 10k 100°C TEMP FLAG SS1 ILIM1 VC1 CLOCKOUT 400kHz TJ GND 33pF 60.
PAGE 31
LT3692 TYPICAL APPLICATIONS 5V and 1.8V Dual 2-Stage Converter VIN 6V TO 36V 1µF 4.7µF VIN2 VIN1 SHDN1 BST1 0.22µF VOUT1 5V 2A 500kHz 8.2µH SHDN2 BST2 SW1 SW2 IND1 IND2 1µH 0.22µF LT3692 VOUT2 VOUT1 47µF ×2 R9 100k 220pF 42.2k 8.06k PG FB1 CMPI2 CMPO1 CMPO2 SS1 0.1µF 47pF 120k 36.5k 61.9k 100k 100pF 47µF 8.06k ILIM2 VC2 RT/SYNC DIV FB1 SS2 ILIM1 VC1 330pF 10k FB2 CMPI1 VOUT2 1.8V 2A 2MHz CLKOUT GND 33pF TJ 0.1µF 0.1µF 330pF 49.9k 39.
PAGE 32
VOUT1 12V 1A 750kHz For more information www.linear.com/3692 120k 0.1µF 47µF 30.1k 33pF 330pF 8.06k 100pF 0.47µF VIN 15V TO 36V 120k 113k 1k 8.2µH 4.7µF DIV GND 0.1µF TJ CLKOUT ILIM1 VC1 RT/SYNC SS2 ILIM2 VC2 SS1 CMPO2 CMPO1 FB2 VOUT2 CMPI2 LT3692 IND2 SW2 SHDN2 BST2 VIN2 CMPI1 FB1 VOUT1 IND1 SW1 SHDN1 BST1 VIN1 24.9k 4.7µH 49.9k 33pF 2.2µF 8.06k 330pF 24.9k 100pF 0.22µF 133k 0.1µF 49.9k PG 47µF 100k VOUT2 3.
PAGE 33
LT3692 TYPICAL APPLICATIONS 5V, 3.3V, 2.5V, 1.8V Synchronized Quad Output VOUT1 5V 2A 2.2µF SVIN PVIN2 PVIN DDR 4.7µF ×2 RUN LT3612 MODE RT VIN2 VIN1 SHDN1 BST1 6.8µH 0.22µF SW1 SW2 IND1 IND2 6.8µH 2.2µF 0.22µF 42.2k 8.06k FB1 FB2 CMPI1 CMPI2 CMPO1 SS1 CMPO2 SS2 ILIM2 VC2 ILIM1 VC1 0.1µF RT/SYNC 330pF DIV 33pF 60.4k 24.9k 16k FB 270k ITH TRACK/SS SGND PGND SVIN PVIN2 60.4k TJ 0.1µF RUN LT3612 100k SS1 ILIM1 VC1 MODE 100°C TEMP FLAG RT 3.3µH VOUT3 2.
PAGE 34
LT3692 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. UH Package 32-Lead Plastic QFN (5mm × 5mm) (Reference LTC DWG # 05-08-1693 Rev D) 0.70 ±0.05 5.50 ±0.05 4.10 ±0.05 3.50 REF (4 SIDES) 3.45 ± 0.05 3.45 ± 0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC RECOMMENDED SOLDER PAD LAYOUT APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 ± 0.10 (4 SIDES) BOTTOM VIEW—EXPOSED PAD 0.75 ± 0.05 R = 0.05 TYP 0.00 – 0.05 R = 0.
PAGE 35
LT3692 Revision History REV DATE DESCRIPTION A 3/13 Clarified Shutdown Quiescent Current vs Temperature Graph PAGE NUMBER 5 Clarified SHDN1/2 Pin Function description 9 Clarified SHDN pin operation in Applications Information operation in general description 10 Clarified SHDN pin operation description in Applications Information 20 3692fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 36
LT3692 Typical Application 1.2MHz, 12V to 3.3V at 3A, 5V at 3A VIN 12V 4.7µF VIN1 SHDN1 BST1 2.2µH 0.22µF 4.7µF VIN2 SHDN2 BST2 SW1 SW2 IND1 IND2 2.2µH 0.22µF LT3692 VOUT1 3.3V 3A 1.2MHz 100pF 47µF 24.9k 100k 8.06k PG1 FB1 CMPI2 CMPO1 CMPO2 120k 24.9k ILIM2 VC2 RT/SYNC DIV 33pF 8.06k 22µF 100k PG SS2 ILIM1 VC1 330pF 100pF 42.2k FB2 CMPI1 SS1 0.1µF VOUT2 5V 3A 1.2MHz VOUT2 VOUT1 CLKOUT GND 42.2k TJ CLOCKOUT 1.2MHz 0.1µF 330pF 0.1µF 33pF 49.9k 30.