LTM4608A
Low V , 8A DC/DC µModule
IN
Regulator with Tracking, Margining,
and Frequency Synchronization
FEATURES
DESCRIPTION
The LTM®4608A is a complete 8A switch mode DC/DC
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Complete Standalone Power Supply
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±1.75% Total DC Output Error (–55°C to 125°C)
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 Tracks Margining
power supply with ±±1.75 total output ꢀoltaꢁe error1 ꢂI-
cluded iI the packaꢁe are the switchiIꢁ coItroller, power
FETs, iIductor aId all support compoIeIts1 OperatiIꢁ
oꢀer aI iIput ꢀoltaꢁe raIꢁe of 21.V to 717V, the LTM4608A
supports aI output ꢀoltaꢁe raIꢁe of 016V to 7V, set by a
siIꢁleexterIalresistor1ThishiꢁhefficieIcydesiꢁIdeliꢀers
up to 8A coItiIuous curreIt (±0A peak)1 OIly bulk iIput
aId output capacitors are Ieeded to complete the desiꢁI1
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Multiphase Operation
Parallel Current Sharing
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Overcurrent/Thermal Shutdown Protection
CurreIt Mode CoItrol/Fast TraIsieIt RespoIse
Selectable Burst Mode® OperatioI
Up to 975 EfficieIcy
Output Oꢀerꢀoltaꢁe ProtectioI
Small, Low Profile 9mm × ±7mm × 218mm
LGA Packaꢁe (01630mm Pads)
The low profile packaꢁe (218mm) eIables utilizatioI of
uIused space oI the back side of PC boards for hiꢁh
deIsity poiIt-of-load reꢁulatioI1 The 01630mm LGA pads
with ±12.mm pitch simplify PCB layout by proꢀidiIꢁ staI-
dard trace routiIꢁ aId ꢀia placemeIt1 The hiꢁh switchiIꢁ
frequeIcy aId curreIt mode architecture eIable a ꢀery
fast traIsieIt respoIse to liIe aId load chaIꢁes without
sacrificiIꢁ stability1 The deꢀice supports frequeIcy syI-
chroIizatioI, proꢁrammable multiphase aId/or spread
spectrum operatioI, output ꢀoltaꢁe trackiIꢁ for supply
rail sequeIciIꢁ aId ꢀoltaꢁe marꢁiIiIꢁ1
APPLICATIONS
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Telecom, NetworkiIꢁ aId ꢂIdustrial EquipmeIt
Fault protectioI features iIclude oꢀerꢀoltaꢁe protectioI,
oꢀercurreIt protectioI aId thermal shutdowI1 The power
module is offered iI a compact aId thermally eIhaIced
9mm × ±7mm × 218mm surface mouIt LGA packaꢁe1 The
LTM4608A is Pb-free aId RoHS compliaIt1
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Storaꢁe Systems
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PoiIt of Load ReꢁulatioI
L, LT, LTC, LTM, LiIear TechIoloꢁy, the LiIear loꢁo, Burst Mode, µModule aId PolyPhase
are reꢁistered trademarks aId LTpowerCAD is a trademark of LiIear TechIoloꢁy CorporatioI1
All other trademarks are the property of their respectiꢀe owIers1 Protected by U1S1 PateIts
iIcludiIꢁ 748±±.8, 6780278, 6304066, 6±2.8±7, 6498466, 66±±±3±1
TYPICAL APPLICATION
Efficiency vs Load Current
2.7V to 5.5V Input to 1.8V Output DC/DC µModule® Regulator
100
V
= 1.8V
OUT
CLKIN
95
V
= 3.3V
IN
CLKIN
V
V
IN
2.7V TO 5.5V
OUT
1.8V
90
85
V
V
IN
OUT
V
= 5V
IN
SV
FB
IN
10µF
100µF
4.87k
SW
I
TH
LTM4608A
RUN
I
THM
80
75
70
PGOOD
PLLLPF
TRACK
PGOOD
MGN
V
OUT
CLKOUT GND SGND
4608A TA01a
0
2
4
6
8
10
LOAD CURRENT (A)
4608A TA01b
4608afc
1