Datasheet

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LTM4600HV

4600hvfc

, LTC, LT and LTM 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.

LOAD CURRENT (A)

EFFICIENCY (%)

4600HV TA01b

24 8

100

1.8V

OUT

2.5V

OUT

3.3V

OUT

10A, 28V

High Efﬁ ciency

DC/DC µModule

The LTM

4600HV is a complete 10A, DC/DC step down

power supply with up to 28V input operation. Included

in the package are the switching controller, power FETs,

inductor, and all support components. Operating over

an input voltage range of 4.5V to 28V, the LTM4600HV

supports an output voltage range of 0.6V to 5V, set by a

single resistor. This high efﬁ ciency design delivers 10A

continuous current (12A peak), needing no heat sinks or

airﬂ ow to meet power speciﬁ cations. Only bulk input and

output capacitors are needed to ﬁ nish the design.

The low proﬁ le package (2.8mm) enables utilization of

unused space on the bottom of PC boards for high density

point of load regulation. High switching frequency and an

adaptive on-time current mode architecture enables a very

fast transient response to line and load changes without

sacriﬁ cing stability. Fault protection features include

integrated overvoltage and short circuit protection with

a defeatable shutdown timer. A built-in soft-start timer is

adjustable with a small capacitor.

The LTM4600HV is packaged in a thermally enhanced,

compact (15mm × 15mm) and low proﬁ le (2.8mm) over-

molded Land Grid Array (LGA) package suitable for auto-

mated assembly by standard surface mount equipment.

The LTM4600HV is Pb-free and RoHS compliant.

■

Telecom and Networking Equipment

■

Military and Avionics Systems

■

Industrial Equipment

■

Point of Load Regulation

■

Servers

■

Complete Switch Mode Power Supply

■

Wide Input Voltage Range: 4.5V to 28V

■

10A DC, 12A Peak Output Current

■

Parallel Two μModule™ DC/DC Converters for 20A

Output Current

■

0.6V to 5V Output Voltage

■

1.5% Output Voltage Regulation

■

Ultrafast Transient Response

■

Current Mode Control

■

–55°C to 125°C Operating Temperature Range

(LTM4600HVMPV)

■

Pb-Free (e4) RoHS Compliant Package Gold-Pad

Finish

■

Up to 92% Efﬁ ciency

■

Programmable Soft-Start

■

Output Overvoltage Protection

■

Optional Short-Circuit Shutdown Timer

■

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

2.8mm) LGA Package

10A μModule Power Supply with 4.5V to 28V Input

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Efﬁ ciency vs Load Current with 24V

(FCB = 0)

4600hv TA01a

LTM4600HV

PGND SGND

OUT

OSET

4.5V TO 28V

ABSMAX

OUT

2.5V*

10A

OUT

31.6k

*REVIEW DE-RATING CURVE AT

THE HIGHER INPUT VOLTAGE

Summary of content (24 pages)

PAGE 1
LTM4600HV 10A, 28VIN High Efficiency DC/DC µModule DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Complete Switch Mode Power Supply Wide Input Voltage Range: 4.5V to 28V 10A DC, 12A Peak Output Current Parallel Two μModule™ DC/DC Converters for 20A Output Current 0.6V to 5V Output Voltage 1.
PAGE 2
LTM4600HV U W W W ABSOLUTE AXI U RATI GS PIN CONFIGURATION (Note 1) fADJ SVIN EXTVCC VOSET TOP VIEW FCB, EXTVCC, PGOOD, RUN/SS, VOUT .......... –0.3V to 6V VIN, SVIN, fADJ ............................................ –0.3V to 28V VOSET, COMP ............................................. –0.3V to 2.7V Operating Temperature Range (Note 2) E and I Grades ..................................... –40°C to 85°C MP Grade........................................... –55°C to 125°C Junction Temperature .........
PAGE 3
LTM4600HV ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 12V. External CIN = 120μF, COUT = 200μF/Ceramic per typical application (front page) conﬁguration.
PAGE 4
LTM4600HV U W TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 21 for all curves) Efﬁciency vs Load Current with 5VIN (FCB = 0) Efﬁciency vs Load Current with 24VIN (FCB = 0) Efﬁciency vs Load Current with 12VIN (FCB = 0) 90 90 90 80 80 80 70 60 50 30 0 2 8 6 4 LOAD CURRENT (A) 70 60 0.6VOUT 1.2VOUT 1.5VOUT 2.5VOUT 3.3VOUT 50 0.6VOUT 1.2VOUT 1.5VOUT 2.
PAGE 5
LTM4600HV U W TYPICAL PERFOR A CE CHARACTERISTICS (See Figure 21 for all curves) Start-Up, IOUT = 10A (Resistive Load) Start-Up, IOUT = 0A VOUT (0.5V/DIV) VOUT (0.5V/DIV) IIN (0.5A/DIV) IIN (0.5A/DIV) 200μs/DIV VIN = 12V VOUT = 1.5V COUT = 200μF NO EXTERNAL SOFT-START CAPACITOR Short-Circuit Protection, IOUT = 0A Short-Circuit Protection, IOUT = 10A VIN to VOUT Stepdown Ratio 5.5 fADJ = OPEN 5.0 VOUT (0.5V/DIV) VOUT (0.5V/DIV) 5V 4.5 4.0 IIN (0.
PAGE 6
LTM4600HV U U U PI FU CTIO S (See Package Description for Pin Assignment) SGND (Pin D23): Signal Ground Pin. All small-signal components should connect to this ground, which in turn connects to PGND at one point. VIN (Bank 1): Power Input Pins. Apply input voltage between these pins and GND pins. Recommend placing input decoupling capacitance directly between VIN pins and GND pins. RUN/SS (Pin F23): Run and Soft-Start Control. Forcing this pin below 0.8V will shut down the power supply.
PAGE 7
LTM4600HV W W SI PLIFIED BLOCK DIAGRA SVIN RUN/SS LTM4600HV VIN, 4.5V TO 28V ABS MAX 1000pF CIN 1.5μF PGOOD Q1 COMP INT COMP VOUT, 2.5V/10A MAX FCB COUT 4.75k 15μF 6.3V CONTROLLER fADJ SGND PGND Q2 10Ω EXTVCC 100k 0.5% VOSET R6 31.6k 4600hv F01 Figure 1. Simpliﬁed LTM4600HV Block Diagram 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.
PAGE 8
LTM4600HV U OPERATIO μModule Description The LTM4600HV is a standalone non-isolated synchronous switching DC/DC power supply. It can deliver up to 10A of DC output current with only bulk external input and output capacitors. This module provides a precisely regulated output voltage programmable via one external resistor from 0.6VDC to 5.0VDC. The input voltage range is 4.5V to 28V. A simpliﬁed block diagram is shown in Figure 1 and the typical application schematic is shown in Figure 21.
PAGE 9
LTM4600HV U U W U APPLICATIO S I FOR ATIO The typical LTM4600HV application circuit is shown in Figure 21. External component selection is primarily determined by the maximum load current and output voltage. Output Voltage Programming and Margining The PWM controller of the LTM4600HV has an internal 0.6V±1% reference voltage. As shown in the block diagram, a 100k/0.5% internal feedback resistor connects VOUT and VOSET pins.
PAGE 10
LTM4600HV U W U U APPLICATIO S I FOR ATIO should be placed directly adjacent the module input pins in the PCB layout to minimize the trace inductance and high frequency AC noise. Output Capacitors The LTM4600HV is designed for low output voltage ripple. The bulk output capacitors COUT is chosen with low enough effective series resistance (ESR) to meet the output voltage ripple and transient requirements.
PAGE 11
LTM4600HV U W U U APPLICATIO S I FOR ATIO Table 2. Output Voltage Response Versus Component Matrix *(Refer to Figure 21) TYPICAL MEASURED VALUES COUT1 VENDORS TDK TAIYO YUDEN TAIYO YUDEN TAIYO YUDEN PART NUMBER C4532X5R0J107MZ (100μF,6.3V) JMK432BJ107MU-T ( 100μF, 6.3V) JMK316BJ226ML-T501 ( 22μF, 6.3V) JMK316BJ226ML-T501 ( 22μF, 6.3V) VOUT CIN CIN COUT1 (V) (CERAMIC) (BULK) (CERAMIC) 1.2 2 × 10μF 35V 150μF 35V 3 × 22μF 6.3V 1.2 2 × 10μF 35V 150μF 35V 1 × 100μF 6.3V 1.
PAGE 12
LTM4600HV U W U U APPLICATIO S I FOR ATIO After the controller has been started and given adequate time to charge up the output capacitor, CSS is used as a short-circuit timer. After the RUN/SS pin charges above 4V, if the output voltage falls below 75% of its regulated value, then a short-circuit fault is assumed. A 1.8μA current then begins discharging CSS. If the fault condition persists until the RUN/SS pin drops to 3.
PAGE 13
LTM4600HV U U W U APPLICATIO S I FOR ATIO Enable EXTVCC Connection The RUN/SS pin can be driven from logic as shown in Figure 5. This function allows the LTM4600HV to be turned on or off remotely. The ON signal can also control the sequence of the output voltage. An internal low dropout regulator produces an internal 5V supply that powers the control circuitry and FET drivers. Therefore, if the system does not have a 5V power rail, the LTM4600HV can be directly powered by VIN.
PAGE 14
LTM4600HV U U W U APPLICATIO S I FOR ATIO In the application where the light load efﬁciency is important, tying the FCB pin above 0.6V threshold enables discontinuous operation where the bottom MOSFET turns off when inductor current reverses. Therefore, the conduction loss is minimized and light load efﬁciency is improved. The penalty is that the controller may skip cycle and the output voltage ripple increases at light load.
PAGE 15
LTM4600HV U U W U APPLICATIO S I FOR ATIO 10 POWER LOSS (W) 3.5 18V LOSS 3.0 2.5 12V LOSS 2.0 1.5 5V LOSS 1.0 9 8 7 6 5 0 LFM 200 LFM 400 LFM 0.5 4 0 2 0 4 6 8 OUTPUT CURRENT (A) MAXIMUM LOAD CURRENT (A) MAXIMUM LOAD CURRENT (A) 4.0 10 50 60 80 70 AMBIENT TEMPERATURE (°C) Figure 8. 1.
PAGE 16
LTM4600HV U U W U APPLICATIO S I FOR ATIO 9 8 7 6 5 4 0 LFM 200 LFM 400 LFM 40 60 70 80 90 50 AMBIENT TEMPERATURE (°C) 100 VIN = 24V VOUT = 3.3V TEMPERATURE DE-RATING 8 6 4 2 0 0 LFM 200 LFM 400 LFM 50 60 80 70 AMBIENT TEMPERATURE (°C) 4600hv F17 Figure 17. BGA Heatsink 90 10 MAXIMUM LOAD CURRENT (A) 10 VIN = 12V VOUT = 3.3V MAXIMUM LOAD CURRENT (A) MAXIMUM LOAD CURRENT (A) 10 0 LFM 200 LFM 400 LFM 9 8 7 6 5 VIN = 24V VOUT = 3.
PAGE 17
LTM4600HV U W U U APPLICATIO S I FOR ATIO VIN t (DC) DUTY CYCLE = ON ts tOFF CIN tON V t DC = ON = OUT ts VIN DC FREQ = tON 4602 F25 PERIOD ts PGND VOUT 4600hv F20 LOAD TOP LAYER Figure 20. Recommended PCB Layout LTM4600HV Frequency Adjustment The LTM4600HV is designed to typically operate at 850kHz across most input and output conditions. The control architecture is constant on time valley mode current control.
PAGE 18
LTM4600HV U W U U APPLICATIO S I FOR ATIO tOFF must be greater than 400ns, or tS – tON > 400ns. tON = 0.41 • 1μs ≅ 410ns tON = DC • tS tOFF = 1μs – 410ns ≅ 590ns ~450kHz frequency or 2.22μs period is chosen for 5V to 3.3V. Frequency range is about 450kHz to 650kHz from 4.5V to 7V input. tON and tOFF are above the minimums with adequate guard band. Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for ION = (1MHz • 2.4V • 10pF) • (1/0.41) ≅ 58μA.
PAGE 19
LTM4600HV U U W U APPLICATIO S I FOR ATIO 12V to 5V at 8A R1 15k 9V TO 16V C1 10μF 25V VIN 5.0 fADJ 4.0 5V AT 8A EXTVCC EFFICIENCY = 94% VOUT FCB VOSET RUN/SS SVIN PGOOD COMP SGND C2 22μF R2 13.7k 1% LTM4600HV RUN/SOFT-START 3.3V: fADJ = 30.1k 4.5 5V: fADJ = 15k C5 100pF + C4 330μF 6.3V 3.5 VOUT (V) C3 10μF 25V VIN to VOUT Stepdown Ratio for 12V to 5V and 5V to 3.3V 3.0 2.5 2.0 1.5 OPEN DRAIN PGND 1.
PAGE 20
LTM4600HV U TYPICAL APPLICATIO Parallel Operation and Load Sharing 4.5V TO 24V C8 10μF 35V VOUT = 0.6V • ([100k/N] + RSET)/RSET WHERE N = 2 C7 10μF 35V VIN fADJ EXTVCC VOUT FCB C9 22μF x3 VOSET LTM4600HV RUN R4 15.8k 1% SVIN + C10 470μF 4V PGOOD COMP SGND PGND 2.5V AT 20A RUN/SOFT-START C3 10μF 35V C1 10μF 35V VIN C4 220pF fADJ EXTVCC 2.
PAGE 21
5.7150 2.5400 0.3175 0.3175 2.7375 C(0.30) PAD 1 13.97 BSC 0.11 – 0.27 6.9850 4.4450 1.2700 0.0000 1.4675 4.0075 6.9421 94 83 72 61 50 39 5.7158 102 100 101 80 69 58 47 91 79 68 57 46 38 31 90 37 30 17 18 33 1 1 8 3 5 6 7 4 8 13 10 9 11 6 28 35 55 14 44 13 13.
PAGE 22
LTM4600HV U PACKAGE DESCRIPTIO Pin Assignment Tables (Arranged by Pin Number) PIN NAME A1 A2 A3 VIN A4 A5 VIN A6 A7 VIN A8 A9 VIN A10 A11 VIN A12 A13 VIN A14 A15 fADJ A16 A17 SVIN A18 A19 EXTVCC A20 A21 VOSET A22 A23 - PIN NAME B1 VIN B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 B22 B23 COMP PIN NAME C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 VIN C11 C12 VIN C13 C14 VIN C15 C16 C17 C18 C19 C20 C21 C22 C23 - PIN NAME D1 VIN D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D
PAGE 23
LTM4600HV U PACKAGE DESCRIPTIO Pin Assignment Tables (Arranged by Pin Number) PIN NAME PIN NAME G1 PGND H7 H9 H11 H13 H15 H17 PGND PGND PGND PGND PGND PGND J1 PGND K7 K9 K11 K13 K15 K17 PGND PGND PGND PGND PGND PGND L2 L4 L6 L8 L10 L12 L14 L16 L18 L20 L22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND M2 M4 M6 M8 M10 M12 M14 M16 M18 M20 M22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND N2 N4 N6 N8 N10 N12 N14 N16 N18 N20 N22 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND
PAGE 24
LTM4600HV U TYPICAL APPLICATIO 1.8V, 10A Regulator 4.5V TO 22V C2 10μF 35V C1 10μF 35V VIN C5 100pF fADJ 1.8V AT 10A EXTVCC VOUT FCB VOSET R1 100k LTM4600HV RUN C3 22μF x3 + C4 470μF 4V SVIN PGOOD COMP SGND PGND 4600hv TA04 PGOOD R2 49.