1
LTC4410
sn4410 4410fs
USB Power Manager
in ThinSOT
■
Manages Total Power Between a USB Peripheral
and Battery Charger
■
Minimal Voltage Drop (100mV at 500mA)
■
Ultralow Battery Drain: 1µA
■
Reverse Current Blocking Diode Not Required
■
Undervoltage Lockout
■
Very Few External Components
■
Compatible with Several LTC Linear Battery Chargers
■
Overtemperature Protected
■
Dual Battery Charge Priority Management
■
Low Profile (1mm) SOT-23 Package
■
Cellular Phones
■
PDAs
■
Digital Cameras
■
MP3 Players
■
Battery Backup Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®
4410 enables simultaneous battery charging and
operation of portable USB 1.0 and 2.0 compliant devices
while they are connected to a USB port. As the USB periph-
eral load increases, the LTC4410 proportionally reduces
the battery charge current to keep the total current less
than 500mA or 100mA, depending on the state of the MODE
pin.
The LTC4410 includes a USB present output that drives an
external P-channel MOSFET to disconnect the battery from
the USB peripheral when the USB power is valid. This
allows device operation when connected to the USB port,
even when the battery is deeply discharged.
Other features include reverse current blocking, thermal
shutdown and low quiescent current (80µA in 500mA
MODE) that is compliant with USB Suspend Mode.
The LTC4410 is available in the low profile (1mm) SOT-23
(ThinSOT
TM
) package.
ThinSOT is a trademark of Linear Technology Corporation.
System Load Step Response
USB Powered Battery Charger and Power Manager
200mA
240mA
440mA
0mA
0mA 5µs/DIV
LOAD
CURRENT
BATTERY
CHARGER
CURRENT
4410 TA02
4.7µF
4.7µF
0.1µF
1Ω3.4k
1% 1M
V
OUT
GND
NTC
TIMER 1-CELL
Li-Ion
LTC4410
LTC4053
V
IN
V
CC
BAT
GND
SHDN
USBPCHP
MODE
OFF ON
SYSTEM POWER
SUPPLY
USB
MODE
500mA
100mA
SUSPEND
LTC4410
MODE
1
0
1
LTC4053
SHDN
1
1
0
4.35V TO 5.5V
FROM
USB
100mA 500mA
4410 TA01
IRLML6401
PROG
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC4410
sn4410 4410fs
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating V
IN
Range ●4.35 5.5 V
Quiescent Current—Active 100mA Mode (MODE = Low) 500 700 µA
500mA Mode (MODE = High) 80 125 µA
CHP Compliance Voltage MODE = 5V, I
VOUT
= 500mA 0 4.0 V
MODE = 0V, I
VOUT
= 0mA 0 3.5 V
Reverse Current V
OUT
= 4V, V
IN
= 0V 1 5 µA
MODE Input Current MODE = 0V 0.1 5 µA
MODE = 5V 0.1 5 µA
MODE Input High ●1.2 V
MODE Input Low ●0.4 V
USBP Output High 1M Resistor to GND, V
IN
= 5V 4.8 4.98 V
USBP Output Low 1M Resistor to V
IN
, V
IN
= 3.5V 20 100 mV
UVLO and USBP Threshold Measured on V
IN
Rising ●4.05 4.2 4.35 V
UVLO and USBP Hysteresis Measured on V
IN
80 100 120 mV
CHP Output Current MODE = High, I
VOUT
= 0mA (Note 2) 0 30 µA
MODE = High, I
VOUT
= 500mA (Note 2) 470 500 530 µA
MODE = High, I
VOUT
= 500mA, T
A
≥ 0°C, (Note 2) ●460 500 540 µA
MODE = High, I
VOUT
= 500mA, T
A
< 0°C, (Note 2) ●450 500 550 µA
MODE = Low, I
VOUT
= 0mA (Note 2) 370 µA
MODE = Low, I
VOUT
= 100mA (Note 2) 430 470 510 µA
(Note 1)
V
IN
, V
OUT
Voltages ...................................... –0.3V to 6V
USBP, MODE, CHP Voltage ........................ –0.3V to 6V
I
VOUT
(Note 5) ............................................................ 2A
Operating Ambient Temperature Range
LTC4410E (Notes 3, 4) ........................–40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
UU
ORDER PART
NUMBER
LTC4410ES6
S6 PART MARKING
LTK8
T
JMAX
= 125°C, θ
JA
= 100°C/W TO 150°C/W
DEPENDING ON PC BOARD LAYOUT
The ● denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise noted.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
VIN 1
GND 2
MODE 3
6 VOUT
5 CHP
4 USBP
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Current flows out of CHP, voltage at CHP = 0V.
Note 3: The LTC4410E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 5: Based on long-term current density limitations.
3
LTC4410
sn4410 4410fs
TYPICAL PERFOR A CE CHARACTERISTICS
UW
IREF Turn-Off Response
V
IN
(V)
0
I
REF
(µA)
150
200
250
35
4410 G03
100
50
012 4
300
350
400
6
T
A
= 25°C
MODE PIN
CHP CURRENT
INTO A 3.4k
RESISTOR
0mA
0V
5V
1µs/DIV 4410 G01
370µA
CHP CURRENT
INTO A 3.4k
RESISTOR
500mA LOAD STEP
0mA
10µs/DIV
4410 G02
500µA
0mA
500mA
CHP Current with ILOAD Step IREF vs VIN (MODE = 0)
IREF vs VCHP (MODE = 0) RDS(ON) vs VIN
VCHP (V)
0
0
IREF (µA)
50
150
200
250
2
450
4410 G04
100
16345
300
350
400
TA = 25°C
V
IN
(V)
4.2
170
172
176
4.8 5.2
4410 G05
168
166
4.4 4.6 5.0 5.4 5.6
164
162
174
R
DS(ON)
(mΩ)
T
A
= 25°C
RDS(ON) vs Temperature
TEMPERATURE (°C)
–50
0
RDS(ON) (mΩ)
50
100
150
200
250
–25 02550
4410 G06
75 100
Reverse Current vs Temperature ICC vs Temperature
TEMPERATURE (°C)
–60
0
REVERSE CURRENT (µA)
0.5
1.5
2.0
2.5
5.0
3.5
–20 20 40
4410 G07
1.0
4.0
4.5
3.0
–40 0 60 80 100
TEMPERATURE (°C)
–60
0
I
CC
(µA)
10
30
40
50
100
70
–20 20 40
4410 G08
20
80
90
60
–40 0 60 80 100
4
LTC4410
sn4410 4410fs
V
IN
(Pin 1): Positive Input Supply. When V
IN
> 4.2V, the
internal undervoltage lockout enables the main switch that
connects V
IN
to V
OUT
. Bypass V
IN
with a 10µF ceramic
capacitor and a 1Ω resistor in series or use a 10µF
capacitor with at least 1Ω minimum ESR. This minimizes
the voltage transient that can occur when the input is hot
switched.
GND (Pin 2): Signal Ground for the LTC4410.
MODE (Pin 3): Mode Select Input. This pin selects the
maximum USB port current of either 100mA or 500mA.
When MODE is high, the current out of CHP will be I
VOUT
/
1000. When MODE is low, the current out of CHP will be
I
VOUT
/1000 + 370µA (typical).
BLOCK DIAGRA
W
THERMAL
SHUTDOWN
M2
×1000
VB
USBP
M1
×1
M3
370µA
S1MODE
CHP
R1
–+
REF
1.25V
R3
R2
VIN
1
3
5
VOUT
6
GND
4410 BD
USBP
2
4
–
+
BODY
SWITCH
–
+
UU
U
PI FU CTIO S
USBP (Pin 4): USB Voltage Present Output. This pin goes
high when V
IN
exceeds the undervoltage lockout threshold
(4.2V typical).
CHP (Pin 5): Charger Program Output. This pin sources a
current that is used by the battery charger to control
charge current.
V
OUT
(Pin 6): LTC4410 Output. Bypass this pin with a
10µF or larger X5R ceramic capacitor. This capacitor
may be omitted if other circuitry connected to V
OUT
contains a bypass capacitor. When V
OUT
> V
IN
, the internal
switch is held off, resulting in very low battery drain
current (1µA typical).
5
LTC4410
sn4410 4410fs
OPERATIO
U
The LTC4410 manages the total current consumption
between a battery charger and a USB portable device. In
a system using the LTC4410, a battery charger can be set
up to charge at the maximum available current from the
USB port without any need to reserve current for the
device load. As the USB device current increases, the
LTC4410 decreases the battery charge current so as not
to exceed the maximum allowable current from the USB
port. This allows for simultaneous battery charging and
device operation. The LTC4410 can only reduce the bat-
tery charge current to zero. It is the responsibility of the
USB device load to not exceed the USB power limits.
The LTC4410 uses an internal power MOSFET to sense
load current. This MOSFET is held off when V
OUT
> V
IN
or
V
IN
< 4.2V (typ). A replica of the I
VOUT
current equal to
I
VOUT
/1000 is sourced out of the CHP pin with an accuracy
of ±6%. This current can be summed into the PROG node
of a battery charger to reduce the charge current. The
LTC4410 is primarily designed to interface with battery
chargers that use a program pin to set the maximum
charge current, with a charge current to program pin
current ratio of 1000:1. The voltage on CHP can be
externally monitored to signal overcurrent conditions.
When V
IN
> 4.2V, the internal USB present comparator
forces the USBP pin high. This signal can be used to detect
when the USB voltage is present and drive an external
switch to connect or disconnect a battery from the USB
peripheral.
The MODE pin controls the state of an internal 370µA
current reference (I
REF
). When active (MODE pin low), the
total current sourced out of CHP is I
VOUT
/1000 +I
REF
. The
primary function of the current reference is to offset the
battery charger charge current for 100mA mode. When
MODE is high, the current reference is disabled. The total
current out of CHP with MODE high is I
VOUT
/1000. The
MODE controlled current offset makes it possible to con-
figure the battery charger and the LTC4410 to support the
USB specification 1.0 and 2.0 required 100mA and 500mA
modes of operation.
The low quiescent current (80µA, when MODE is high) of
the LTC4410 makes the system easily compliant with the
USB specifications 1.0 and 2.0 SUSPEND MODE current
consumption requirements.
When V
OUT
> V
IN
, the LTC4410 transitions to low power
mode, draining 1µA (typical) from the Lithium-Ion battery.
This condition occurs when the USB device is operating
off of its internal battery and not connected to the USB
port.
6
LTC4410
sn4410 4410fs
APPLICATIO S I FOR ATIO
WUUU
USB Power Management and Wall Adapter Power
With the addition of a few components, the LTC4410
allows for simultaneous device operation and battery
charging while connected to USB port or wall adapter. The
LTC4410 will proportionally reduce the battery charge
current to keep the total current within the current rated for
the wall adapter. Figure 1 shows an example of how to
combine the USB power and wall adapter inputs. A
P-channel MOSFET, MP1, is used to prevent back con-
ducting into the USB port when a wall adapter is present.
The pull-down resistor, R1, is to assure that MP1 is on
when there is no wall adapter. The Schottky diode, D1, is
used to prevent USB power loss through R1. If the wall
adapter used has more than 500mA capability, a resistor,
R3, connected in parallel with R2 using N-channel MOSFET
MN1 will increase the charge current when the wall adapter
is present. In this example the battery charge current is
340mA without the wall adapter (see the LTC4053 data
sheet for details on how to program the battery charge
current). When the wall adapter is present, the charge
current is 750mA.
4.7µF
1Ω
R1
1k
D1
R3
4.87k
1%
MN1
R2
3.4k
1%
VOUT
LTC4410
VIN
GND USBP
CHP
MP1
MODE100mA 500mA
4.35V TO 5.25V
FROM USB
5V WALL ADAPTER
750mA
0.1µF
GND
NTC
TIMER
LTC4053
VIN
BAT
1-CELL
Li-Ion
SHDN
OFF ON
4410 F01
PROG
4.7µF
1M
ILOAD
MP2
SYSTEM
POWER SUPPLY
Figure 1. USB Power Management and Wall Adapter Power
7
LTC4410
sn4410 4410fs
APPLICATIO S I FOR ATIO
WUUU
C1
4.7µF
C3
4.7µF
C2
0.15µF
R1
1Ω
R3
2k
R2
2k
VOUT
GND
NTC
TIMER BAT2
LTC4410
LTC4053
VIN
VIN
BAT
GND
SHDN
USBPCHP
MODE
OFF ON
5V WALL
ADAPTER
4410 F02
PROG
+
+
+
C4
0.1µF
GND
NTC
TIMER BAT1
LTC4053
VIN
BAT
SHDN
OFF ON
PROG
+
Figure 2. Priority Dual Battery Charging with Wall Adapter
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Dual Battery Charging with Priority
The LTC4410 can be used to manage two battery chargers,
giving one of the chargers (see Figure 2) priority. When
BAT1 is being charged, the charge current is flowing
through the LTC4410. The LTC4410 is sensing the current
and sourcing a current equal to BAT1 charge current/1000
out of CHP. This effectively reduces the BAT2 charger
current. As BAT1 current demands reduce, the current
sourced out of CHP is reduced, enabling BAT2 to have
more current. In this example the power supply is a 750mA
minimum wall adapter, R
PROG
(R2 and R3) for the charg-
ers are 2kΩ, resulting in a 750mA charge current. In this
application, the total current out of the wall adapter will
never exceed 750mA.
8
LTC4410
sn4410 4410fs
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2002
LT/TP 1203 1K • PRINTED IN USA
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PowerPath is a trademark of Linear Technology Corporation.
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.30 – 0.45
6 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX 0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
PIN ONE ID
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62
MAX
0.95
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
