LTC4098/LTC4098-1
USB Compatible Switching
Power Managers/Li-Ion Chargers
with Overvoltage Protection
FEATURES DESCRIPTION
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Switching Regulator with Bat-Track Adaptive The LTC 4098/LTC4098-1 are high efficiency USB Power-
Output Control Makes Optimal Use of Limited Path controllers and full-featured Li-Ion/Polymer battery
Power Available from USB Port to Charge Battery chargers. They seamlessly manage power distribution from
and Power Application multiple sources including USB, wall adapter, automotive,
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Overvoltage Protection Guards Against Damage Firewire or other high voltage DC/DC converters, and a
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Bat-Track External Step-Down Switching Regulator Li-Ion/Polymer battery.
Control Maximizes Efficiency from Automotive,
The LTC4098/LTC4098-1s internal switching regulator
Firewire and Other High Voltage Input Sources
automatically limits its input current for USB compatibility.
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180m Internal Ideal Diode Plus External Ideal Diode
For automotive and other high voltage applications, the
Controller Seamlessly Provide Low Loss PowerPath
LTC4098/LTC4098-1 interface with a Linear Technology
when Input Power is Limited or Unavailable
external switching regulator to provide a high efficiency
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Preset 4.2V Charge Voltage with 0.5% Accuracy
high voltage power path. Both the USB and the optional
(4.1V for LTC4098-1)
high voltage inputs feature Bat-Track optimized charging
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4.1V Float Voltage (LTC4098-1) Improves Battery Life
to provide maximum power to the application and ease
and High Temperature Safety Margin
thermal issues in high power density applications with
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Instant-On Operation with Discharged Battery
input supplies from 5V to as high as 38V.
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700mA Maximum Load Current from USB Port
n An overvoltage circuit protects the LTC4098/LTC4098-1
1.5A Maximum Charge Current with Thermal Limiting
n from high voltage damage on the USB/wall adaptor inputs
20-Lead 3mm 4mm 0.75mm QFN Package
with an N-channel FET and a resistor.
APPLICATIONS
The LTC4098/LTC4098-1 are available in a 20-lead, 3mm
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Media Players
4mm 0.75mm QFN surface mount package.
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GPS
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Bat-Track and PowerPath are trademarks of Linear Technology Corporation.
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PDAs
All other trademarks are the property of their respective owners.
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Smart Phones
TYPICAL APPLICATION
USB Switching Regulator Efficiency
High Efficiency USB/Automotive Battery Charger with Overvoltage Protection
to System Load (P /P )
VOUT VBUS
INPUT
100
AUTOMOTIVE,
LT3653
FIREWIRE, ETC.
90
3.3H
SYSTEM
80
LOAD
INPUT
BAT = 4.2V
70
V V WALL SW
BUS C
USB
10F
60
BAT = 3.3V
50
V
OVGATE OUT
LTC4098/LTC4098-1
6.04k
40
OVSENS
3 30
TO C D0-D2
BAT
20
CLPROG PROG GND BATSENS V = 5V
10F
BUS
I = 0mA
10 BAT
10x MODE
0
+
0.1F 3.01k 1k
Li-Ion
0.01 0.1 1
40981 TA01a
I (A)
VOUT
40981 TA01b
40981fc
1
EFFICIENCY (%)LTC4098/LTC4098-1
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
V , WALL (Transient) t < 1ms,
TOP VIEW
BUS
Duty Cycle < 1% .......................................... 0.3V to 7V
V , WALL (Static), BAT, BATSENS,
BUS
20 19 18 17
CHRG, NTC, ................................................. 0.3V to 6V
OVSENS 1 16 D1
D0, D1, D2.........0.3V to Max (V , V , BAT) + 0.3V OVGATE 2 15 D0
BUS OUT
CLPROG 3 14 SW
I ................................................................ 10mA
OVSENS 21
NTCBIAS 4 13 V
BUS
I ....................................................................3mA
CLPROG
NTC 5 12 V
OUT
I ........................................................................2mA
BATSENS 6 11 BAT
PROG
I ......................................................................50m A
7 8 9 10
CHRG
I , I , I ............................................................2A
VOUT SW BAT
I ......................................................................10mA
ACPR
UDC PACKAGE
20-LEAD (3mm s 4mm) PLASTIC QFN
Operating Temperature Range (Note 2) ...40C to 85C
T = 125C, = 43C/W
JMAX JA
Junction Temperature ........................................... 125C
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
Storage Temperature Range .................. 65C to 125C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4098EPDC#PBF LTC4098EPDC#TRPBF DDVT 40C to 85C (OBSOLETE)
20-Lead (3mm 4mm) Plastic UTQFN
LTC4098EUDC#PBF LTC4098EUDC#TRPBF LDDT 40C to 85C
20-Lead (3mm 4mm) Plastic QFN
LTC4098EPDC-1#PBF LTC4098EPDC-1#TRPBF DSZT 20-Lead (3mm 4mm) Plastic UTQFN 40C to 85C (OBSOLETE)
LTC4098EUDC-1#PBF LTC4098EUDC-1#TRPBF LFXX 20-Lead (3mm 4mm) Plastic QFN 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: