Linear Technology Analog Devices LTM4622A Datasheet
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Linear Technology Analog Devices LTM4622A Datasheet

Dual ultrathin 2a or single 4a step-down dc/dc umodule regulator
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FEATURES
Complete Solution in <1cm
n
Wide Input Voltage Range: 3.6V to 20V
n
1.5V to 12V Output Voltage
n
Dual 2A (3A Peak) or Single 4A Output Current
n
±1.5% Maximum Total Output Voltage Regulation
n
Error Over Load, Line and Temperature
Current Mode Control, Fast Transient Response
n
External Frequency Synchronization
n
Multiphase Parallelable with Current Sharing
n
Output Voltage Tracking and Soft-Start Capability
n
Selectable Burst Mode
n
Overvoltage Input and Overtemperature Protection
n
Power Good Indicators
n
6.25mm × 6.25mm × 1.82mm LGA and
n
6.25mm × 6.25mm × 2.42mm BGA Packages
APPLICATIONS
General Purpose Point-of-Load Conversion
n
Telecom, Networking and Industrial Equipment
n
Medical Diagnostic Equipment
n
Test and Debug Systems
n
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V and 5V Dual Output DC/DC Step-Down µModule Regulator
V
IN1
V
IN
V
IN2
8V TO 20V
4.7µF
RUN1
25V
RUN2
INTV CC
SYNC/MODE
TRACK/SS1
TRACK/SS2
FREQ
Document Feedback
Step-Down DC/DC µModule Regulator
2
Operation
®
PGOOD1
PGOOD2
V
OUT1
LTM4622A
V
OUT2
COMP1
COMP2
FB1
FB2
GND
4622A TA01a
For more information
Dual Ultrathin 2A or Single 4A
DESCRIPTION
The
LTM
4622A
®
mode µModule
®
6.25mm × 6.25mm × 1.82mm LGA and 2.42mm BGA pack-
ages. Included in the package are the switching controller,
power FETs, inductor and support components. Operating
over an input voltage range of 3.6V to 20V, the LTM4622A
supports an output voltage range of 1.5V to 12V, set by a
single external resistor. Its high efficiency design delivers
dual 2A continuous, 3A peak, output current. Only a few
ceramic input and output capacitors are needed.
The LTM4622A supports selectable Burst Mode operation
and output voltage tracking for supply rail sequencing. Its
high switching frequency and current mode control enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include input overvoltage, output
overcurrent and overtemperature protection.
The LTM4622A is available with SnPb (BGA) or RoHS
compliant terminal finish.
Product Selection Guide
PART NUMBER V
IN
LTM4622
3.6V to 20V
LTM4622A
100
V
OUT1
3.3V, 2A
47µF
V
OUT2
5V, 2A
47µF
13.3k
8.25k
www.analog.com
LTM4622A
is a complete dual 2A step-down switching
(micromodule) regulator in a tiny ultrathin
RANGE
V
RANGE
OUT
0.6V to 5.5V
Dual 2.5A or Single 5A
1.5V to 12V
Dual 2A or Single 4A
12V Input, 3.3V and 5V Output,
Efficiency vs Load Current
95
90
85
80
75
V
OUT
V
OUT
70
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
I
OUT
= 5V
= 3.3V
4622A TA01b
Rev B
1

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Summary of Contents for Linear Technology Analog Devices LTM4622A

  • Page 1 LTM4622A Dual Ultrathin 2A or Single 4A Step-Down DC/DC µModule Regulator FEATURES DESCRIPTION Complete Solution in <1cm 4622A is a complete dual 2A step-down switching ® Wide Input Voltage Range: 3.6V to 20V mode µModule (micromodule) regulator in a tiny ultrathin ®...

  • Page 2: Absolute Maximum Ratings

    LTM4622A ABSOLUTE MAXIMUM RATINGS (Note 1) ........... –0.3V to 22V Operating Internal Temperature Range ............–0.3V to 16V (Note 2) ..........–40°C to 125°C PGOOD1, PGOOD2 ........–0.3V to 18V Storage Temperature Range ....–55°C to 125°C RUN1, RUN2 ........–0.3V to V + 0.3V Peak Solder Reflow Body Temperature ....

  • Page 3: Electrical Characteristics

    LTM4622A ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the specified internal operating temperature range (Note 2). Specified as each individual output channel at T = 25°C, V = 12V, unless otherwise noted per the typical application shown in Figure 27. SYMBOL PARAMETER CONDITIONS...
  • Page 4 LTM4622A ELECTRICAL CHARACTERISTICS denotes the specifications which apply over the specified internal operating temperature range (Note 2). Specified as each individual output channel at T = 25°C, V = 12V, unless otherwise noted per the typical application shown in Figure 27. SYMBOL PARAMETER CONDITIONS...

  • Page 5: Typical Performance Characteristics

    LTM4622A TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current at 5V at 12V at 16V 12V OUTPUT, 1.5MHz 8V OUTPUT, 1.5MHz 8V OUTPUT, 1.5MHz 5V OUTPUT, 1.5MHz 5V OUTPUT, 1.5MHz 3.3V OUTPUT, 1MHz 3.3V OUTPUT, 1MHz 3.3V OUTPUT, 1MHz 1.5V OUTPUT, 1MHz...
  • Page 6 LTM4622A TYPICAL PERFORMANCE CHARACTERISTICS Start-Up with No Load Start-Up with 2A Load Short-Circuit with No Load Current Applied Current Applied Current Applied 2V/DIV 2V/DIV 2V/DIV 10V/DIV 10V/DIV 0.5A/DIV 1A/DIV 1A/DIV 10ms/DIV 10ms/DIV 4622A G11 4622A G10 20µs/DIV 4622A G12 = 12V, V = 3.3V, f = 1MHz = 12V, V...

  • Page 7: Pin Functions

    LTM4622A PIN FUNCTIONS PACKAGE ROW AND COLUMN LABELING MAY VARY RUN1 (D2), RUN2 (B2): Run Control Input of Each Switch- AMONG µModule PRODUCTS. REVIEW EACH PACKAGE ing Mode Regulator Channel. Enables chip operation by LAYOUT CAREFULLY . tying RUN above 1.27V. Tying this pin below 1V shuts down the specific regulator channel.

  • Page 8: Block Diagram

    LTM4622A BLOCK DIAGRAM OUT1 OUT2 60.4k 60.4k PGOOD1 INTV 13.3k PGOOD2 INTV 8.25k INTV 2.2µF 8V TO 20V 0.22µF 10µF SYNC/MODE TRACK/SS1 2.2µH OUT1 OUT1 3.3V 0.1µF 0.1µF 47µF TRACK/SS2 0.1µF RUN1 RUN2 0.22µF 10µF COMP1 POWER CONTROL INTERNAL COMP 2.2µH OUT2 OUT2...

  • Page 9: Operation

    LTM4622A OPERATION The LTM4622A is a dual output standalone non-isolated a wide range of output capacitors, even with all ceramic switch mode DC/DC power supply. It can deliver two 2A output capacitors. DC, 3A peak output current with few external input and Current mode control provides cycle-by-cycle fast cur- output ceramic capacitors.
  • Page 10 Pease note that for output above 3.3V, a higher operating The Linear Technology LTpowerCAD Design Tool is avail- ® frequency is required to optimize inductor current ripple.
  • Page 11 LTM4622A APPLICATIONS INFORMATION on with each oscillator pulse. During start-up, forced The programmable operating frequency range is from continuous mode is disabled and inductor current is 800kHz to 4MHz. prevented from reversing until the LTM4622A’s output Frequency Synchronization voltage is in regulation. The power module has a phase-locked loop comprised Operating Frequency of an internal voltage controlled oscillator and a phase...
  • Page 12 LTM4622A APPLICATIONS INFORMATION reduction as a function of the number of interleaved phases. 200k Figure 3 shows this graph. 0° 3.3V INTV SYNC/MODE V OUT1 Soft-Start and Output Voltage Tracking 180° OUT2 LTC6902 The TRACK/SS pin provides a means to either soft-start 90°...
  • Page 13 LTM4622A APPLICATIONS INFORMATION Output voltage tracking can also be programmed externally is the feedback resistor and the R The R FB(SL) TR(TOP) using the TRACK/SS pin. The output can be tracked up and is the resistor divider on the TRACK/SS pin of TR(BOT) down with another regulator.
  • Page 14 LTM4622A APPLICATIONS INFORMATION From the equation, we could easily find out that, in the The LTM4622A accomplishes this by forcing discontinuous coincident tracking, the slave regulator’s TRACK/SS pin mode (DCM) operation until the TRACK/SS pin voltage resistor divider is always the same as its feedback divider. reaches 0.6V reference voltage.
  • Page 15 LTM4622A APPLICATIONS INFORMATION software, the thermal resistances reported in the Pin Con- which does not reflect an actual application or viable figuration section are in-and-of themselves not relevant to operating condition. providing guidance of thermal performance; instead, the 3. θ , the thermal resistance from junction to top of JCtop derating curves provided in the data sheet can be used in...
  • Page 16 LTM4622A APPLICATIONS INFORMATION to correlate quite well with the µModule model with no As a practical matter, it should be clear to the reader that airflow or heat sinking in a properly define chamber. This no individual or sub-group of the four thermal resistance + θ...
  • Page 17 LTM4622A APPLICATIONS INFORMATION = 16V = 16V = 16V = 12V = 12V = 12V = 5V = 5V LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 4622A F08 4622A F09 4622A F10 Figure 8. 1.5V Output Power Loss Figure 9. 3.3V Output Power Loss Figure 10.
  • Page 18 LTM4622A APPLICATIONS INFORMATION 0LFM 0LFM 0LFM 200LFM 200LFM 200LFM 400LFM 400LFM 400LFM 90 100 110 120 90 100 110 120 90 100 110 120 AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) 4622A F17 4622A F18 4622A F19 Figure 17. 12V Input to 3.3V Output Figure 18.
  • Page 19 LTM4622A APPLICATIONS INFORMATION Table 2. 1.5V Output DERATING CURVE POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK θ JA(°C/W) Figures 13, 14, 15 5, 12, 16 Figure 8 None 19–20 Figures 13, 14, 15 5, 12, 16 Figure 8 None 17–18 Figures 13, 14, 15 5, 12, 16 Figure 8 None...
  • Page 20 LTM4622A APPLICATIONS INFORMATION Table 7. Output Voltage Response for Each Regulator Channel vs Component Matrix (Refer to Figure 24) 1.0A Load Step Typical Measured Values OUT1 OUT2 (CERAMIC) PART NUMBER VALUE (CERAMIC) PART NUMBER VALUE (BULK) PART NUMBER VALUE Murata GRM188R61E475KE11# 4.7µF, 25V, Murata GRM21R60J476ME15# 47µF, 6.3V,...
  • Page 21 LTM4622A APPLICATIONS INFORMATION Figure  24 and Figure  25 show measured temperature and without airflow. The derived thermal resistances in Tables 2 to 6 for the various conditions can be multiplied picture of the LTM4622A with no heat sink from 12V by the calculated power loss as a function of ambient input down to 3.3V and 5V output with 2A DC current on each and from 12V down to 5V and 8V output with 2A...
  • Page 22 LTM4622A APPLICATIONS INFORMATION Figure 24. Thermal Image, 12V Input, 3.3V and 5V Output, 2A Each, No Airflow and No Heat Sink Figure 25. Thermal Image, 12V Input, 5V and 8V Output, 2A Each, No Airflow and No Heat Sink Rev B For more information www.analog.com...
  • Page 23 LTM4622A APPLICATIONS INFORMATION LAYOUT CHECKLIST/EXAMPLE • To minimize the via conduction loss and reduce module thermal stress, use multiple vias for interconnection The high integration of LTM4622A makes the PCB board between top layer and other power layers. layout very simple and easy. However, to optimize its electrical and thermal performance, some layout con- •...
  • Page 24 LTM4622A APPLICATIONS INFORMATION PGOOD1 PGOOD2 10µF OUT1 RUN1 OUT1 3.3V, 2A 47µF 8V TO 20V OUT2 10µF RUN2 OUT2 5V, 2A LTM4622A 47µF INTV COMP1 SYNC/MODE COMP2 TRACK/SS1 0.1µF TRACK/SS2 FREQ 13.3k 8.25k 4622A F27 0.1µF Figure 27. 8V to 20V , 3.3V and 5V Output at 2A Design PGOOD PGOOD1 PGOOD2...
  • Page 25 LTM4622A APPLICATIONS INFORMATION PGOOD1 PGOOD2 10µF OUT1 RUN1 OUT1 1.5V, 2A 47µF 4V TO 20V OUT2 10µF OUT2 RUN2 3.3V, 2A LTM4622A 47µF INTV COMP1 SYNC/MODE COMP2 TRACK/SS1 60.4k TRACK/SS2 OUT1 FREQ 40.2k 0.1µF 13.3k 4622A F30 13.3k Figure 30. 4V to 20V , 1.5V and 3.3V Output at 2A Design with Output Coincident Tracking PGOOD...

  • Page 26: Package Description

    LTM4622A PACKAGE DESCRIPTION PACKAGE ROW AND COLUMN LABELING MAY VARY AMONG µModule PRODUCTS. REVIEW EACH PACKAGE LAYOUT CAREFULLY . LTM4622A Component LGA and BGA Pinout PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION TRACK/SS2 COMP2 OUT2...
  • Page 27 LTM4622A PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTM4622A#packaging for the most recent package drawings. Rev B For more information www.analog.com...
  • Page 28 LTM4622A PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTM4622A#packaging for the most recent package drawings. Rev B For more information www.analog.com...

  • Page 29: Revision History

    LTM4622A REVISION HISTORY DATE DESCRIPTION PAGE NUMBER 11/17 Corrected Pin Configuration. Swapped V and V 4/18 Corrected R to GND 9, 11 FSET Rev B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

  • Page 30: Design Resources

    Quick videos detailing how to bench test electrical and thermal performance of µModule products. Digital Power System Management Linear Technology’s family of digital power supply management ICs are highly integrated solutions that offer essential functions, including power supply monitoring, supervision, margining and sequencing, and feature EEPROM for storing user configurations and fault logging.

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