LTM4608EV#PBF Linear Technology, LTM4608EV#PBF Datasheet

IC DC/DC UMODULE 8A 68-LGA

LTM4608EV#PBF

Manufacturer Part Number
LTM4608EV#PBF
Description
IC DC/DC UMODULE 8A 68-LGA
Manufacturer
Linear Technology
Series
µModuler
Type
Point of Load (POL) Non-Isolatedr
Datasheet

Specifications of LTM4608EV#PBF

Design Resources
LTM4608 Spice Model
Output
0.6 ~ 5 V
Number Of Outputs
1
Power (watts)
40W
Mounting Type
Surface Mount
Voltage - Input
2.7 ~ 5.5 V
Package / Case
68-LGA
1st Output
0.6 ~ 5 VDC @ 8A
Size / Dimension
0.59" L x 0.35" W x 0.11" H (15mm x 9mm x 2.8mm)
Power (watts) - Rated
40W
Operating Temperature
-40°C ~ 85°C
Efficiency
95%
Dc To Dc Converter Type
Step Down
Pin Count
68
Input Voltage
5.5V
Output Voltage
0.6 to 5V
Switching Freq
1.7MHz
Output Current
8A
Package Type
LGA
Output Type
Adjustable
Switching Regulator
Yes
Load Regulation
0.75%
Line Regulation
0.2%/V
Mounting
Surface Mount
Input Voltage (min)
2.375V
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
3rd Output
-
2nd Output
-
Lead Free Status / Rohs Status
Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTM4608EV#PBF
Manufacturer:
LT
Quantity:
218
Company:
Part Number:
LTM4608EV#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTM4608EV#PBF
Quantity:
171
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
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n
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For easier board layout and PCB assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4608A.
TYPICAL APPLICATION
2.7V TO 5.5V
2.7V to 5.5V Input to 1.8V Output DC/DC µModule
Complete Standalone Power Supply
±1.5% Output Voltage Regulation
2.7V to 5.5V Input Voltage Range
8A DC, 10A Peak Output Current
0.6V Up to 5V Output
Output Voltage Tracking and Margining
Power Good Tracking and Margining
Multiphase Operation
Parallel Current Sharing
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Overcurrent/Thermal Shutdown Protection
Small Surface Mount Footprint, Low Profile
(9mm × 15mm × 2.8mm) LGA Package
Telecom, Networking and Industrial Equipment
Storage Systems
Point of Load Regulation
V
IN
10µF
V
SV
SW
RUN
PLLLPF
TRACK
CLKOUT GND
IN
IN
LTM4608
CLKIN
CLKIN
SGND
PGOOD
V
MGN
I
THM
OUT
I
FB
TH
4608 TA01a
PGOOD
V
OUT
4.87k
®
Regulator with Tracking, Margining,
Regulator
and Frequency Synchronization
100µF
V
1.8V
Low V
OUT
DESCRIPTION
The LTM
power supply. Included in the package are the switching
controller, power FETs, inductor and all support compo-
nents. Operating over an input voltage range of 2.7V to
5.5V, the LTM4608 supports an output voltage range of
0.6V to 5V, set by a single external resistor. This high ef-
ficiency design delivers up to 8A continuous current (10A
peak). Only bulk input and output capacitors are needed.
The low profile package (2.8mm) enables utilization of
unused space on the back side of PC boards for high
density point-of-load regulation. The high switching
frequency and a current mode architecture enable a very
fast transient response to line and load changes without
sacrificing stability. The device supports frequency syn-
chronization, programmable multiphase and/or spread
spectrum operation, output voltage tracking for supply
rail sequencing and voltage margining.
Fault protection features include overvoltage protection,
overcurrent protection and thermal shutdown. The power
module is offered in a compact and thermally enhanced
9mm × 15mm × 2.8mm LGA package. The LTM4608 is
Pb-free and RoHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
®
IN
4608 is a complete 8A switch mode DC/DC
100
95
90
85
80
75
70
, 8A DC/DC µModule
0
Efficiency vs Load Current
2
V
IN
= 5V
LOAD CURRENT (A)
V
IN
4
= 3.3V
6
V
OUT
8
= 1.8V
LTM4608
4608 TA01b
10
4608fc
1

Related parts for LTM4608EV#PBF

LTM4608EV#PBF Summary of contents

Page 1

... LGA package. The LTM4608 is Pb-free and RoHS compliant. L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... LTM4608A. ORDER INFORMATION LEAD FREE FINISH PART MARKING* LTM4608EV#PBF LTM4608V LTM4608IV#PBF LTM4608V Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER I Input Supply Bias Current Q(VIN) I Input Supply Current S(VIN) Output Specifications I Output Continuous Current Range OUT(DC) (See Output Current Derating Curves for Different ...

Page 4

LTM4608 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER TRACK Tracking Threshold (Rising) Tracking Threshold (Falling) Tracking Disable Threshold R Resistor Between V and FB FBHI OUT Pins ΔV PGOOD Range PGOOD %Margining Output Voltage Margining Percentage ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current 100 CONTINUOUS MODE 1.2V IN OUT 5V 1.5V IN OUT 5V 1. OUT 5V 2.5V IN OUT 5V 3.3V IN OUT ...

Page 6

LTM4608 TYPICAL PERFORMANCE CHARACTERISTICS Load Transient Response 2A/DIV 20mV/DIV 4608 G10 20µs/DIV 1.8V OUT 2.5A/µs STEP C = 100µF X5R OUT C1 = NONE NONE FROM FIGURE 18 Start-Up V OUT 0.5V/DIV ...

Page 7

PIN FUNCTIONS V (C1, C8, C9, D1, D3-D5, D7-D9 and E8): Power Input IN Pins. Apply input voltage between these pins and GND pins. Recommend placing input decoupling capacitance directly between V pins and GND pins (C10-C11, D10-D11, ...

Page 8

LTM4608 PIN FUNCTIONS FB (E7): The Negative Input of the Error Amplifier. Internally, this pin is connected to V with a 10k precision resistor. OUT Different output voltages can be programmed with an ad- ditional resistor between FB and GND ...

Page 9

SIMPLIFIED BLOCK DIAGRAM SV IN TRACK MGN BSEL PGOOD MODE RUN CLKIN CLKOUT PHMODE I TH INTERNAL COMP PLLLPF INTERNAL FILTER I THM SGND Table 1. Decoupling Requirements 25°C, Block Diagram Configuration. A SYMBOL PARAMETER C External Input ...

Page 10

... The LTM4608 is internally compensated to be stable over all operating conditions. Table 3 provides a guideline for input and output capacitances for several operating conditions. The Linear Technology µModule Power De- sign Tool is provided for transient and stability analysis. APPLICATIONS INFORMATION The typical LTM4608 application circuit is shown in Fig- ure 18 ...

Page 11

... The table optimizes total equivalent ESR and total bulk capacitance to optimize the transient performance. Stability criteria are considered in the Table 3 matrix, and the Linear Technology LTpowerCAD™ Design Tool is available for stability analysis. Multiphase operation will reduce effective output ripple as a function of the number of phases ...

Page 12

LTM4608 APPLICATIONS INFORMATION Table 3. Output Voltage Response Versus Component Matrix (Refer to Figure 18 Load Step TYPICAL MEASURED VALUES C VENDORS VALUE PART NUMBER OUT1 TDK 22µF, 6.3V C3216X7S0J226M Murata 22µF, 16V GRM31CR61C226KE15L TDK 100µF, 6.3V ...

Page 13

APPLICATIONS INFORMATION provide more output current without increasing input and output voltage ripple. The CLKIN pin allows the LTC4608 to synchronize to an external clock (between 0.75MHz and 2.25MHz) and the internal phase-locked loop allows the LTM4608 to lock onto ...

Page 14

LTM4608 APPLICATIONS INFORMATION The LTM4608 device is an inherently current mode con- trolled device. Parallel modules will have very good current sharing. This will balance the thermals on the design. Tie the I pins of each LTM4608 together to share ...

Page 15

APPLICATIONS INFORMATION peak noise. Spread spectrum operation is disabled if CLKIN is tied to ground or if it’s driven by an external frequency synchronization signal. A capacitor value of 0.01µF must be placed from the PLLLPF pin to ground to ...

Page 16

LTM4608 APPLICATIONS INFORMATION The track pin of the master can be controlled by an external ramp and C in Figure 5 referenced ramp time can be programmed using equation:    ...

Page 17

APPLICATIONS INFORMATION Slope Compensation The module has already been internally compensated for all output voltages. Table 3 is provided for most application requirements. A spice model will be provided for other control loop optimization. For single module operation, connect I ...

Page 18

LTM4608 APPLICATIONS INFORMATION 400LFM 1 200LFM 0LFM AMBIENT TEMPERATURE (°C) Figure 9. No Heat Sink with 3. ...

Page 19

APPLICATIONS INFORMATION 400LFM 1 200LFM 0LFM AMBIENT TEMPERATURE (°C) Figure 15. No Heat Sink with 5V Table 4. 1.5V Output DERATING CURVE V (V) IN ...

Page 20

LTM4608 APPLICATIONS INFORMATION Safety Considerations The LTM4608 modules do not provide isolation from There is no internal fuse. If required, a slow blow OUT fuse with a rating twice the maximum input current needs to be ...

Page 21

TYPICAL APPLICATIONS 5. 10µF MODE PHMODE 5.5V TRACK C2 10µF Figure 19. Two LTM4608s in Parallel, 1.5V at 16A Design. See Also Dual 8A per Channel LTM4616 CLKIN CLKIN V ...

Page 22

LTM4608 TYPICAL APPLICATIONS D1 MMSD4148 SHDN D2 MMSD4148 SHDN Figure 20. Dual LTM4608 Output Sequencing Application See Also Dual 8A per Channel LTM4616 V IN 2.7V TO 5.5V 0.01µF Figure 21. 2.7V to 5.5V 22 CLKIN CLKIN ...

Page 23

TYPICAL APPLICATIONS LTM4608 4608fc 23 ...

Page 24

LTM4608 PACKAGE DESCRIPTION Z aaa bbb 6.350 5.080 3.810 2.540 1.270 0.381 0.000 0.381 1.270 2.540 3.810 5.080 6.350 4608fc ...

Page 25

... Added value of 0.22µH to Inductor in Figure 1 Updated Figure 3 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTM4608 ...

Page 26

... GND G3 GND GND GND THM GND TH F7 GND G7 GND F8 GND G8 GND OUT OUT F10 V G10 V OUT OUT F11 V G11 V OUT OUT ≤ 5V, 9mm × 15mm × 2.3mm LGA Package OUT LT 0311 REV C • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 2007 4608fc ...

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