Datasheet

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LTM4603HV

4603hvf

6A, 28V

DC/DC µModule

with PLL, Output Tracking

and Margining

■

Telecom and Networking Equipment

■

Servers

■

Industrial Equipment

■

Point of Load Regulation

■

Complete Switch Mode Power Supply

■

Wide Input Voltage Range: 4.5V to 28V

■

6A DC Typical, 8A Peak Output Current

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0.6V to 5V Output Voltage

■

Output Voltage Tracking and Margining

■

Remote Sensing for Precision Regulation

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Typical Operating Frequency: 1MHz

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PLL Frequency Synchronization

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1.5% Regulation

■

Current Foldback Protection (Disabled at Start-Up)

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Pin Compatible with the LTM4601/LTM4601HV/

LTM4603

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Ultrafast Transient Response

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Current Mode Control

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Up to 93% Efﬁ ciency at 5V

, 3.3V

OUT

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Programmable Soft-Start

■

Output Overvoltage Protection

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Pb-Free (e4) RoHS Compliant Package with Gold

Finish Pads

■

Small Footprint, Low Proﬁ le (15mm × 15mm ×

2.8mm) Surface Mount LGA Package

2.5V/6A with 4.5V to 28V Input μModule Regulator

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Efﬁ ciency vs Load Current with 24V

The LTM

4603HV is a complete 6A step-down switch mode

DC/DC power supply with onboard switching controller,

MOSFETs, inductor and all support components. The

μModule

is housed in a small surface mount 15mm ×

15mm × 2.8mm LGA package. Operating over an input

voltage range of 4.5 to 28V, the LTM4603HV supports an

output voltage range of 0.6V to 5V as well as output voltage

tracking and margining. The high efﬁ ciency design deliv-

ers 6A continuous current (8A peak). Only bulk input and

output capacitors are needed to complete the design.

The low proﬁ le (2.8mm) and light weight (1.7g) package

easily mounts on the unused space on the back side of

PC boards for high density point of load regulation. The

μModule can be synchronized with an external clock for

reducing undesirable frequency harmonics and allows

PolyPhase

operation for high load currents.

A high switching frequency and adaptive on-time current

mode architecture deliver a very fast transient response

to line and load changes without sacriﬁ cing stability. An

onboard remote sense ampliﬁ er can be used to accurately

regulate an output voltage independent of load current.

, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology

Corporation. μModule is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

OUT

MARG0

MARG1

OUT_LCL

DIFFV

OUT

OSNS

–

PGOOD

RUN

COMP

INTV

DRV

MPGM

TRACK/SSPLLIN

LTM4603HV

ON/OFF

392k

19.1k

MARGIN

CONTROL

OUT

4603HV TA01a

OUT

2.5V

CLOCK SYNC

TRACK/SS CONTROL

100pF

SET

PGNDSGND

5% MARGIN

4.5V TO 28V

LOAD CURRENT (A)

EFFICIENCY (%)

100

4603HV G03

467

24V

, 1.8V

OUT

24V

, 2.5V

OUT

24V

, 3.3V

OUT

24V

, 5V

OUT

Summary of content (24 pages)

PAGE 1
LTM4603HV 6A, 28VIN DC/DC µModule with PLL, Output Tracking and Margining DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Complete Switch Mode Power Supply Wide Input Voltage Range: 4.5V to 28V 6A DC Typical, 8A Peak Output Current 0.6V to 5V Output Voltage Output Voltage Tracking and Margining Remote Sensing for Precision Regulation Typical Operating Frequency: 1MHz PLL Frequency Synchronization 1.
PAGE 2
LTM4603HV U W W W ABSOLUTE AXI U RATI GS PIN CONFIGURATION (Note 1) INTVCC, DRVCC, VOUT_LCL, VOUT (VOUT ≤ 3.3V with Remote Sense Amp) ............................ –0.3V to 6V PLLIN, TRACK/SS, MPGM, MARG0, MARG1, PGOOD....................................... –0.3V to INTVCC + 0.3V RUN ............................................................. –0.3V to 5V VFB, COMP ................................................ –0.3V to 2.7V VIN ............................................................. –0.
PAGE 3
LTM4603HV ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the –40°C to 85°C temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁguration. SYMBOL PARAMETER CONDITIONS IS(VIN) Input Supply Current VIN = 12V, VOUT = 1.5V, IOUT = 6A VIN = 12V, VOUT = 3.3V, IOUT = 6A VIN = 5V, VOUT = 1.5V, IOUT = 6A INTVCC VIN = 12V, RUN > 2V No Load MIN TYP MAX 0.85 1.78 2.034 4.7 5 UNITS A A A 5.
PAGE 4
LTM4603HV ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the –40°C to 85°C temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁguration. SYMBOL PARAMETER CONDITIONS VFB Error Ampliﬁer Input Voltage Accuracy IOUT = 0A, VOUT = 1.5V MIN TYP MAX UNITS 0.594 0.6 0.606 V 1 1.5 1.9 V –1 –1.
PAGE 5
LTM4603HV U W TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 20 for all curves) Efﬁciency vs Load Current with 24VIN Efﬁciency vs Load Current with 12VIN 100 100 90 90 90 80 80 80 70 5VIN, 0.6VOUT 5VIN, 1.2VOUT 5VIN, 1.5VOUT 5VIN, 1.8VOUT 5VIN, 2.5VOUT 5VIN, 3.3VOUT 60 50 40 0 1 4 3 2 5 LOAD CURRENT (A) 6 70 12VIN, 1.2VOUT 12VIN, 1.5VOUT 12VIN, 1.8VOUT 12VIN, 2.5VOUT 12VIN, 3.
PAGE 6
LTM4603HV U W TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 20 for all curves) Short-Circuit Protection, IOUT = 0A Start-Up, IOUT = 6A (Resistive Load) Start-Up, IOUT = 0A VOUT 0.5V/DIV VOUT 0.5V/DIV VOUT 0.5V/DIV IIN 0.5A/DIV IIN 0.5A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V COUT = 1x 22μF, 6.3V CERAMIC 1x 330μF, 4V SANYO POSCAP SOFT-START = 3.9nF 4603HV G09 IIN 2A/DIV 1ms/DIV VIN = 12V VOUT = 1.5V COUT = 1x 22μF, 6.3V CERAMIC 1x 330μF, 4V SANYO POSCAP SOFT-START = 3.
PAGE 7
LTM4603HV U U U PI FU CTIO S (See Package Description for Pin Assignment) VIN (Bank 1): Power Input Pins. Apply input voltage between these pins and PGND pins. Recommend placing input decoupling capacitance directly between VIN pins and PGND pins. VOUT (Bank 3): Power Output Pins. Apply output load between these pins and PGND pins. Recommend placing output decoupling capacitance directly between these pins and PGND pins. Review the ﬁgure below.
PAGE 8
LTM4603HV U U U PI FU CTIO S (See Package Description for Pin Assignment) MARG0 (Pin C12): This pin is the LSB logic input for the margining function. Together with the MARG1 pin will determine if margin high, margin low or no margin state is applied. The pin has an internal pull-down resistor of 50k. See Applications Information. ranges from 0V to 2.4V with 0.7V corresponding to zero sense voltage (zero current). PGOOD (Pin G12): Output Voltage Power Good Indicator.
PAGE 9
LTM4603HV U W U DECOUPLI G REQUIRE E TS TA = 25°C, VIN = 12V. Use Figure 1 conﬁguration. SYMBOL PARAMETER CONDITIONS MIN CIN External Input Capacitor Requirement (VIN = 4.5V to 28V, VOUT = 2.5V) IOUT = 6A 20 COUT External Output Capacitor Requirement (VIN = 4.5V to 28V, VOUT = 2.5V) IOUT = 6A 100 TYP MAX UNITS μF 200 μF U OPERATIO Power Module Description The LTM4603HV is a standalone nonisolated switching mode DC/DC power supply.
PAGE 10
LTM4603HV U U W U APPLICATIO S I FOR ATIO The typical LTM4603HV application circuit is shown in Figure 20. External component selection is primarily determined by the maximum load current and output voltage. Refer to Table 2 for speciﬁc external capacitor requirements for a particular application. where %VOUT is the percentage of VOUT you want to margin, and VOUT(MARGIN) is the margin quantity in volts: VIN to VOUT Step-Down Ratios where RPGM is the resistor value to place on the MPGM pin to ground.
PAGE 11
LTM4603HV U W U U APPLICATIO S I FOR ATIO or choose a capacitor rated at a higher temperature than required. Always contact the capacitor manufacturer for derating requirements. In Figure 20, the 10μF ceramic capacitors are together used as a high frequency input decoupling capacitor. In a typical 6A output application, two very low ESR, X5R or X7R, 10μF ceramic capacitors are recommended.
PAGE 12
LTM4603HV U U W U APPLICATIO S I FOR ATIO 1.00 0.95 1-PHASE 2-PHASE 3-PHASE 4-PHASE 6-PHASE 0.90 0.85 RATIO = PEAK-TO-PEAK OUTPUT RIPPLE CURRENT DIr 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 DUTY CYCLE (VO/VIN) 4603HV F04 Figure 4.
PAGE 13
LTM4603HV U U W U APPLICATIO S I FOR ATIO the ramp of the internal reference and the output voltage. The total soft-start time can be calculated as: ( ) t SOFTSTART = 0.8 V • 0.6 V – VOUT(MARGIN) • CSS 1.5µA When the RUN pin falls below 1.5V, then the TRACK/SS pin is reset to allow for proper soft-start control when the regulator is enabled again. Current foldback and force continuous mode are disabled during the soft-start process.
PAGE 14
LTM4603HV U U W U APPLICATIO S I FOR ATIO to the rising edge of the external clock. The frequency range is ±30% around the operating frequency of 1MHz. A pulse detection circuit is used to detect a clock on the PLLIN pin to turn on the phase lock loop. The pulse width of the clock has to be at least 400ns and 2V in amplitude. During the start-up of the regulator, the phase-lock loop function is disabled. current sharing. This will balance the thermals on the design.
PAGE 15
LTM4603HV U U W U 6 5 5 5 4 3 2 5VIN, 1.5VOUT, 0LFM 5VIN, 1.5VOUT, 200LFM 5VIN, 1.5VOUT, 400LFM 1 0 MAXIMUM LOAD CURRENT (A) 6 MAXIMUM LOAD CURRENT (A) 6 4 3 2 1 80 85 90 AMBIENT TEMPERATURE (°C) 95 4 3 2 12VIN, 1.5VOUT, 0LFM 12VIN, 1.5VOUT, 200LFM 12VIN, 1.5VOUT, 400LFM 1 0 0 70 95 75 80 85 90 AMBIENT TEMPERATURE (°C) 4603HV F10 12VIN, 1.5VOUT, 0LFM 12VIN, 1.5VOUT, 200LFM 12VIN, 1.5VOUT, 400LFM Figure 10.
PAGE 16
LTM4603HV Table 2. Output Voltage Response Versus Component Matrix (Refer to Figure 20) TYPICAL MEASURED VALUES COUT1 VENDORS TAIYO YUDEN TAIYO YUDEN TDK VOUT (V) 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.
PAGE 17
LTM4603HV U W U U APPLICATIO S I FOR ATIO Table 3. 1.5V Output DERATING CURVE VIN (V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK θJA (°C/W) Figures 9, 11 5, 12 Figure 7 0 None 15.2 Figures 9, 11 5, 12 Figure 7 200 None 14 Figures 9, 11 5, 12 Figure 7 400 None 12 Figures 10, 12 5, 12, 20 Figure 7 0 BGA Heat Sink 13.9 Figures 10, 12 5, 12, 20 Figure 7 200 BGA Heat Sink 11.3 Figures 10, 12 5, 12, 20 Figure 7 400 BGA Heat Sink 10.
PAGE 18
LTM4603HV U W U U APPLICATIO S I FOR ATIO Safety Considerations • Do not put vias directly on pads. The LTM4603HV modules do not provide isolation from VIN to VOUT. There is no internal fuse. If required, a slow blow fuse with a rating twice the maximum input current needs to be provided to protect each unit from catastrophic failure. • If vias are placed onto the pads, the the vias must be capped. Layout Checklist/Example • Interstitial via placement can also be used if necessary.
PAGE 19
LTM4603HV U W U U APPLICATIO S I FOR ATIO Example for 5V Output Example for 3.3V Output LTM4603HV minimum on-time = 100ns; tON = ((4.8 • 10pf)/IfSET) LTM4603HV minimum on-time = 100ns; tON = ((3.
PAGE 20
LTM4603HV U W U U APPLICATIO S I FOR ATIO VOUT TRACK/SS CONTROL VIN 10V TO 28V R2 100k R4 100k MPGM RUN COMP INTVCC DRVCC 5% MARGIN R1 392k 1% C1 10μF 35V C2 10μF 35V VIN PGOOD PLLIN TRACK/SS VOUT LTM4603HV SGND PGND REVIEW TEMPERATURE DERATING CURVE C6 100pF VFB MARG0 MARG1 + VOUT_LCL DIFFVOUT VOSNS+ VOSNS– VOUT 5V 5A REFER TO TABLE 2 C3 100μF 6.3V SANYO POSCAP fSET RfSET 150k RSET 8.25k MARGIN CONTROL IMPROVE EFFICIENCY FOR ≥12V INPUT SOT-323 DUAL CMSSH-3C3 4603HV F18 Figure 18.
PAGE 21
LTM4603HV U U W U APPLICATIO S I FOR ATIO CLOCK SYNC VOUT VIN 4.5V TO 28V R2 100k C5 0.01μF R4 100k PGOOD CIN BULK OPT. TABLE 2 + CIN 10μF 35V ×2 CER PLLIN TRACK/SS VOUT VIN PGOOD MPGM RUN ON/OFF COMP INTVCC DRVCC R1 392k LTM4603HV SGND PGND VFB MARG0 MARG1 REVIEW TEMPERATURE DERATING CURVE C3 100pF COUT1 22μF 6.3V MARGIN CONTROL COUT2 470μF 6.3V VOUT_LCL DIFFVOUT VOSNS+ VOSNS– fSET RSET 40.2k 100k* VIN *100k NEEDED ONLY FOR ≥20V INPUT 5% MARGIN + VOUT 1.
PAGE 22
LTM4603HV TYPICAL APPLICATIONS LTC6908-1 R9 118k V+ OUT1 GND OUT2 SET MOD C8 0.1μF 0° PHASE 2-PHASE OSCILLATOR 3.3V 3.3V VIN 5V TO 28V R4 100k R3 100k C1 10μF 35V ×2 R2 392k C3 0.15μF 180° PHASE PLLIN VIN VOUT PGOOD VFB RUN LTM4603HV COMP VOUT_LCL DIFFVOUT INTVCC DRVCC VOSNS+ MPGM VOSNS– MARG0 fSET TRACK/SS MARG1 SGND PGND C8 22pF RSET1 13.3k C2 100μF 6.3V C4 220μF 6.3V VOUT1 3.3V 6A 3.3V TRACK R16 60.4k MARGIN CONTROL R7 100k R8 100k C5 10μF 35V ×2 R2 392k R15 19.
PAGE 23
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. C(0.30) PAD 1 1.27 BSC 13.97 BSC 0.12 – 0.28 6.9850 5.7150 4.4450 3.1750 1.9050 0.6350 0.0000 0.6350 1.9050 3.1750 4.4450 5.7150 6.9850 6.9850 1 5.7150 2 4.4450 3.1750 1.9050 0.
PAGE 24
LTM4603HV RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC2900 Quad Supply Monitor with Adjustable Reset Timer Monitors Four Supplies; Adjustable Reset Timer LTC2923 Power Supply Tracking Controller Tracks Both Up and Down; Power Supply Sequencing LT3825/LT3837 Synchronous Isolated Flyback Controllers No Optocoupler Required; 3.