LTM4604A

LTM4604A LINER | Alldatasheet

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FEATURES

APPLICATIONS

DESCRIPTION

Low Voltage, 4A DC/DC µModule with Tracking The LTM®4604A is a complete 4A switch mode DC/DC power supply with ±1.75% total output voltage error. Included in the package are the switching controller, power FETs, inductor and all support components. Operating over an input voltage range of 2.375V to 5.5V, the LTM4604A supports an output voltage range of 0.8V to 5V, set by a single resistor. This high effi ciency design delivers up to 4A continuous current (5A peak). Only bulk output capaci- tors are needed to complete the design. The 0.630mm LGA pads with 1.27mm pitch simplify PCB layout by providing standard trace routing and via placement. (The LTM4604A has smaller pads than the LTM4604.) The low profi le package (2.3mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrifi cing stability. Fault protection features include foldback current protec- tion, thermal shutdown and a programmable soft-start function. The LTM4604A is offered in a small thermally enhanced 15mm × 9mm × 2.3mm LGA package and is Pb free and RoHS compliant. 3.3V to 2.5V/4A μModule™ Regulator ■ Complete Standalone Power Supply ■ ± 1.75% Total DC Output Error (–40°C to 125°C) ■ Wide Input Voltage Range: 2.375V to 5.5V ■ 4A DC, 5A Peak Output Current ■ 0.8V to 5V Output ■ Output Voltage T racking ■ UltraFastTM T ransient Response ■ Power Good Indicator ■ Current Mode Control ■ Current Foldback Protection, Parallel/Current Sharing ■ Up to 95% Effi ciency ■ Programmable Soft-Start ■ Micropower Shutdown: I Q ≤ 7μA ■ Overtemperature Protection ■ Small and Very Low Profi le Package: 15mm × 9mm × 2.3mm LGA (0.630mm Pads) ■ Telecom and Networking Equipment ■ Servers ■ Storage Cards ■ ATCA Cards ■ Industrial Equipment , L T , L TC and L TM are registered trademarks of Linear Technology Corporation. μModule and UltraFast are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. VIN VIN VIN 3.3V PGOOD COMP L TM4604A RUN/SS 2.37k 4604A TA01a 22μF 6.3V V OUT 2.5V 10μF 6.3V VOUT FB TRACK GND OUTPUT CURRENT (A) 100 4604A TA01b 12 4 EFFICIENCY (%) VIN = 3.3V VOUT = 2.5V Effi ciency vs Output Current

ELECTRICAL CHARACTERISTICS

Internal Operating Temperature Range (Note 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN(DC) Input DC Voltage ● 2.375 5.5 V VOUT(DC) Output Voltage, Total Variation with Line and Load RFB = 5.69k VIN = 2.375V to 5.5V, IOUT = 0A to 4A (Note 3) ● 1.482 1.474 1.5 1.5 1.518 1.522 V V Input Specifi cations V IN(UVLO) Undervoltage Lockout Threshold IOUT = 0A 1.75 2 2.3 V IINRUSH(VIN) Peak Input Inrush Current at Start-Up I OUT = 0A, CIN = 10μF, COUT = 22μF ×3, RUN/SS = 0.01μF, VOUT = 1.5V VIN = 3.3V VIN = 5V 0.7 0.7 A A I Q(VIN NOLOAD) Input Supply Bias Current V IN = 3.3V, No Switching VIN = 3.3V, VOUT = 1.5V, Switching Continuous VIN = 5V, No Switching VIN = 5V, VOUT = 1.5V, Switching Continuous Shutdown, RUN = 0, V IN = 5V 100 μA mA μA mA μA The ● denotes the specifi cations which apply over the full internal operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V unless otherwise noted. See Figure 15. PIN CONFIGURATION ORDER INFORMATION LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE (NOTE 2) LTM4604AEV#PBF LTM4604AEV#PBF LTM4604AV 66-Lead (15mm × 9mm × 2.3mm) LGA –40°C to 125°C LTM4604AIV#PBF LTM4604AIV#PBF LTM4604AV 66-Lead (15mm × 9mm × 2.3mm) LGA –40°C to 125°C Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ This product is only offered in trays. For more information go to: http://www.linear.com/packaging/ GND GND RUN/ SSSW A BCDEFG TRACK TOP VIEW LGA PACKAGE 66-PIN (15mm × 9mm × 2.3mm) 0.630mm PAD PGOOD COMP V OUT VIN FB TJMAX = 125°C, θJA = 25°C/W , θJP = 7°C/W , θJC = 50°C/W , WEIGHT = 1.0g

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The L TM4604AE is guaranteed to meet performance specifi cations over the 0°C to 125°C internal operating temperature range. Specifi cations over the full –40°C to 125°C internal operating temperature range are assured ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full internal operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V unless otherwise noted. See Figure 15. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IS(VIN) Input Supply Current V IN = 2.5V, VOUT = 1.5V, IOUT = 4A VIN = 3.3V, VOUT = 1.5V, IOUT = 4A VIN = 5V, VOUT = 1.5V, IOUT = 4A 2.9 2.2 1.45 A A A Output Specifi cations I OUT(DC) Output Continuous Current Range (Note 3) VIN = 3.3V, VOUT = 1.5V 4 A ΔVOUT(LINE) VOUT ΔVOUT(LOAD) VOUT Load Regulation Accuracy V OUT = 1.5V, 0A to 4A (Note 3) VIN = 3.3V VIN = 5V 0.3 0.3 0.6 0.6 VOUT(AC) Output Ripple Voltage I OUT = 0A VIN = 3.3V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V mVP-P mVP-P fS Output Ripple Voltage Frequency IOUT = 4A, VIN = 5V, VOUT = 1.5V 1.25 MHz ΔVOUT(START) Turn-On Overshoot V OUT = 1.5V, RUN/SS = 10nF, IOUT = 0A VIN = 3.3V VIN = 5V mV mV tSTART Turn-on Time V OUT = 1.5V, IOUT = 1A Resistive Load, TRACK = V IN and RUN/SS = Float V IN = 3.3V VIN = 5V 1.5 1.0 ms ms ΔVOUT(LS) Peak Deviation for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, COUT = 22μF ×3 Ceramic VIN = 5V, VOUT = 1.5V 25 mV tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load VIN = 5V, VOUT = 1.5V 10 μs IOUT(PK) Output Current Limit V IN = 3.3V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V A A Control Section V FB Voltage at FB Pin I OUT = 0A, VOUT = 1.5V 0.793 0.788 0.8 0.8 0.807 0.808 V V IFB 0.2 μA VRUN RUN Pin On/Off Threshold 0.5 0.65 0.8 V ITRACK TRACK Pin Current 0.2 μA VTRACK(OFFSET) Offset Voltage TRACK = 0.4V 30 mV VTRACK(RANGE) Tracking Input Range 0 0.8 V RFBHI Resistor Between V OUT and FB Pins 4.975 4.99 5.025 kΩ PGOOD ΔVPGOOD PGOOD Range ±7.5 % RPGOOD PGOOD Resistance Open-Drain Pull-Down 90 150 Ω by design, characterization and correlation with statistical process controls. The L TM4604AI is guaranteed to meet specifi cations over the full internal operating temperature range. Note that the maximum ambient temperature is determined by specifi c operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 3: See output current derating curves for different V IN, VOUT and TA.

TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current VIN = 2.5V Minimum Input Voltage at 4A Load Load T ransient Response Effi ciency vs Output Current VIN = 3.3V Effi ciency vs Output Current VIN = 5V OUTPUT CURRENT (A) 100 4604A G01 12 4 EFFICIENCY (%) VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V OUTPUT CURRENT (A) 100 4604A G02 12 4 EFFICIENCY (%) VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V OUTPUT CURRENT (A) EFFICIENCY (%) 12 34 4604A G03 VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V VIN (V) VOUT (V) 0.5 1.5 2.0 2.5 3.5 0.5 2.5 3.5 4604A G04 1.0 3.0 2 4.5 5.551 1.5 34 VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 1.2V COUT = 4 × 22μF , 6.3V CERAMICS 20μs/DIV 4604A G05 Load T ransient Response ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 1.5V COUT = 4 × 22μF , 6.3V CERAMICS 20μs/DIV 4604A G06 Load T ransient Response ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 1.8V COUT = 3 × 22µF, 6.3V CERAMICS 20µs/DIV 4604A G07 ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 2.5V COUT = 3 × 22µF, 6.3V CERAMICS 20µs/DIV 4604A G08 ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 3.3V COUT = 2 × 22µF, 6.3V CERAMICS 20µs/DIV 4604A G09 Load T ransient Response Load T ransient Response

TYPICAL PERFORMANCE CHARACTERISTICS Start-Up Start-Up Current Limit Foldback VOUT 1V/DIV IIN 1A/DIV VIN = 5V VOUT = 2.5V COUT = 4 × 22µF NO LOAD (0.01µF SOFT-START CAPACITOR) 200µs/DIV 4604A G10 VOUT 1V/DIV IIN 1A/DIV VIN = 5V VOUT = 2.5V COUT = 4 × 22μF 4A LOAD (0.01μF SOFT-START CAPACITOR) 200μs/DIV 4604A G11 OUTPUT CURRENT (A) VOUT (V) 0.6 0.8 1.0 6 8 4604A G12 0.4 0.2 45 7 1.2 1.4 1.6 VIN = 5V VIN = 3.3V VIN = 2.5V VOUT = 1.5V Short-Circuit Protection 1.5V Short, No Load Short-Circuit Protection 1.5V Short, 4A Load VOUT 0.5V/DIV IIN 4A/DIV 20μs/DIV 4604A G13 VOUT 0.5V/DIV IIN 1A/DIV 100μs/DIV 4604A G14 VFB vs Temperature TEMPERATURE (°C) –50

794 VFB (mV)

–25 50 0 25 100 125 75 4604A G15

VIN (B1, C1, C3-C7, D7, E6 and E7): Power Input Pins. Apply input voltage between these pins and GND pins. Recommend placing input decoupling capacitance directly between V IN pins and GND pins. VOUT (D8-D11, E8-E11, F6-F11, G6-G11): Power Output Pins. Apply output load between these pins and GND pins. Recommend placing output decoupling capaci- tance directly between these pins and GND pins. Review Table 4. GND (G3-G5, F3-F5, E4-E5, A1-A11, B6-B11, C8-C11): Power Ground Pins for Both Input and Output Returns. TRACK (E1): O u t p u t Vo l t a g e Tr a c k i n g P i n . W h e n t h e m o dul e is confi gured as a master output, then a soft-start capaci- tor is placed on the RUN/SS pin to ground to control the master ramp rate. Slave operation is performed by putting a resistor divider from the master output to ground, and connecting the center point of the divider to this pin on the slave regulator. If tracking is not desired, then connect the TRACK pin to V IN. Load current must be present for tracking. See Applications Information section. FB (G2): The Negative Input of the Error Amplifi er. Inter- nally, this pin is connected to VOUT with a 4.99k precision resistor. Different output voltages can be programmed with an additional resistor between FB and GND pins. Two power modules can current share when this pin is connected in parallel with the adjacent module’s FB pin. See Applications Information section. COMP (G1): Current Control Threshold and Error Amplifi er Compensation Point. The current comparator threshold increases with this control voltage. Two power modules can current share when this pin is connected in parallel with the adjacent module’s COMP pin. PGOOD (F1): O u t pu t Vo l t a g e P ow er Go o d In di c a t or. O p e n - drain logic output that is pulled to ground when the output voltage is not within ±7.5% of the regulation point. RUN/SS (D1): Run Control and Soft-Start Pin. A voltage above 0.8V will turn on the module, and below 0.5V will turn off the module. This pin has a 1M resistor to V IN and a 1000pF capacitor to GND. See Application Information section for soft-start information. The shut down pin should be pull low with a falling edge of ≤ 1μs to ensure the device does not transition slowly through the internal under voltage lockout threshold. SW (B3 and B4): Switching Node of the circuit is used for testing purposes. This can be connected to copper on the board to improve thermal performance. Make sure not to connect it to other output pins.

Figure 1. Simplifi ed LTM4604A Block Diagram

The LTM4604A is a standalone non-isolated switch mode DC/DC power supply. It can deliver up to 4A of DC output current with few external input and output capacitors. This module provides a precise regulated output voltage programmable via one external resistor from 0.8V DC to 5.0V DC over a 2.375V to 5.5V input voltage. A typical application schematic is shown in Figure 15. The LTM4604A has an integrated constant frequency current mode regulator with built-in power MOSFETs with fast switching speed. The typical switching frequency is 1.25MHz. With current mode control and internal feedback loop compensation, the LTM4604A module has suffi cient stability margins and good transient performance under a wide range of operating conditions and with a wide range of output capacitors, even all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limit. In addition, foldback current limiting is provided in an overcurrent condition while V OUT drops. Internal overvoltage and undervoltage comparators pull the open- drain PGOOD output low if the output feedback voltage exits a ±7.5% window around the regulation point. Furthermore, in an overvoltage condition, internal top FET M1 is turned off and bottom FET M2 is turned on and held on until the overvoltage condition clears. Pulling the RUN pin below 0.5V forces the controller into its shutdown state, turning off both M1 and M2. At low load current, the module works in continuous current mode by default to achieve minimum output voltage ripple. The TRACK pin is used for power supply tracking. See the Applications Information section. The LTM4604A is internally compensated to be stable over a wide operating range. Table 4 provides a guideline for input and output capacitance for several operating conditions. An excel loop analysis tool is provided for transient and stability analysis. The FB pin is used to program the output voltage with a single resistor connected to ground.

Figure 15. External component selection is primarily requirements for a particular application. down ratio that can be achieved for a given input voltage. Table 1. FB Resistor vs Output Voltage 4A maximum current is 2A or less. The LTM4604A is designed for low output voltage ripple. voltage droop and overshoot during a 2A/μs transient. in steady-state operation, but also in transient.

load current for tracking down. a ±7.5% window around the regulation point. already been internally compensated for all output voltages. Table 4 is provided for most application requirements. be provided for other control loop optimizations. design. Figure 16 shows a schematic of the parallel design. N is the number of paralleled modules. derating curves are derived. Figure 4. 1.2V Power Loss Figure 5. 2.5V Power Loss

Table 3. 2.5V Output Table 2. 1.2V Output Table 4. Output Voltage Response Versus Component Matrix (Refer to Figure 17), 0A to 2A Load Step Typical Measured Values

Figure 16. Two LTM4604As in Parallel, 1.5V at 8A Design

Figure 17. 3.3V to 5V Input, 2.5V at 4A Design

NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994 2. ALL DIMENSIONS ARE IN MILLIMETERS LAND DESIGNATION PER JESD MO-222 5. PRIMARY DATUM -Z- IS SEATING PLANE 6. THE TOTAL NUMBER OF PADS: 66 DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE 2.19 – 2.45 DETAIL B DETAIL B SUBSTRATE MOLD CAP 0.290 – 0.350 1.90 – 2.10 // bbb Z Z PACKAGE TOP VIEW 9.00 BSC 15.00 BSC PAD “A1” CORNER X Y aaa Z aaa Z PACKAGE BOTTOM VIEW PADS SEE NOTES DETAIL A 0.630 ±0.025 SQ. 68x S YXeee SUGGESTED PCB LAYOUT TOP VIEW LGA 66 0108 REV Ø L TMXXXXXX μModule TRAY PIN 1 BEVEL PACKAGE IN TRAY LOADING ORIENTATION COMPONENT PIN “A1” DETAIL A 7.620 BSC 1.27 BSC 12.70 BSC PAD 1FGE A BCD 0.000 1.270 1.270 2.540 2.540 3.810 3.810 6.350 6.350 3.810 3.810 5.080 5.080 2.540 2.540 1.270 1.270 0.315 0.3150.000 SYMBOL aaa bbb eee TOLERANCE 0.15 0.10 0.05 0.315 0.315 66-Lead (15mm × 9mm × 2.32mm) (Reference L TC DWG # 05-08-1820 Rev Ø)

Information furnished by Linear Technology Corpor ation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- t i o n t h a t t h e i n t e r c o n n e c t i o n o f i t s c i r c u i t s a s d e s c r i b e d h e r e i n w i l l n o t i n f r i n g e o n e x i s t i n g p a t e n t r i g h t s . PACKAGE DESCRIPTION Pin Assignment Table (Arranged by Pin Number) PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME A1 GND B1 V IN C1 V IN D1 RUN/SS E1 TRACK F1 PGOOD G1 COMP A 2 G N D B 2 –C 2 –D 2 –E 2 –F 2 –G 2 F B A3 GND B3 SW C3 V IN D3 – E3 – F3 GND G3 GND A4 GND B4 SW C4 V IN D4 – E4 GND F4 GND G4 GND A5 GND B5 – C5 V IN D5 – E5 GND F5 GND G5 GND A6 GND B6 GND C6 V IN D6 – E6 V IN F6 V OUT G6 V OUT A7 GND B7 GND C7 V IN D7 V IN E7 V IN F7 V OUT G7 V OUT A8 GND B8 GND C8 GND D8 V OUT E8 V OUT F8 V OUT G8 V OUT A9 GND B9 GND C9 GND D9 V OUT E9 V OUT F9 V OUT G9 V OUT A10 GND B10 GND C10 GND D10 V OUT E10 V OUT F10 V OUT G10 V OUT A11 GND B11 GND C11 GND D11 V OUT E11 V OUT F11 V OUT G11 V OUT

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2008 LT 0808 • PRINTED IN USA 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 LTM4600HV 10A DC/DC μModule 4.5V ≤ V IN ≤ 28V; 0.6V ≤ VOUT ≤ 5V; 15mm × 15mm × 2.8mm LTM4601/LTM4601A 12A DC/DC μModule with PLL, Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation, LTM4601-1/LTM4601A-1 Version has no Remote Sensing LTM4601AHVMP 12A Military Grade μModule 4.5V ≤ V IN ≤ 28V; 0.6V ≤ VOUT ≤ 5V; 15mm × 15mm × 2.8mm, –55°C to 125°C LTM4602 6A DC/DC μModule Pin Compatible with the LTM4600 LTM4603 6A DC/DC μModule with PLL and Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation, LTM4603-1 Version has no Remote Sensing, Pin Compatible with the LTM4601 LTM4605 5A Buck-Boost μModule 4.5V ≤ V IN ≤ 20V; 0.8V ≤ VOUT ≤ 16V; 15mm × 15mm × 2.8mm LGA LTM4607 5A Buck-Boost μModule 4.5V ≤ V IN ≤ 36V; 0.8V ≤ VOUT ≤ 24V; 15mm × 15mm × 2.8mm LGA LTM4608A 8A Low Voltage μModule 2.4V ≤ V IN ≤ 5.5V, Parallel for Higher Output Current, 9mm × 15mm × 2.8mm LGA LTM4616 Dual 8A DC/DC μModule Dual 8A or Single 16A; 2.375V ≤ V IN ≤ 5.5V; 15mm × 15mm × 2.5mm LGA LTM8022 1A DC/DC μModule 3.6V ≤ V IN ≤ 36V; 0.8V ≤ VOUT ≤ 10V; 11.25mm × 9mm × 2.8mm LGA LTM8023 2A DC/DC μModule 3.6V ≤ V IN ≤ 36V; 0.8V ≤ VOUT ≤ 10V; 11.25mm × 9mm × 2.8mm LGA RELATED PARTS PACKAGE PHOTOGRAPH