LTC4410
USB Power Manager
in ThinSOT
FEATURES
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DESCRIPTIO
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
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
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Cellular Phones
PDAs
Digital Cameras
MP3 Players
Battery Backup Systems
TYPICAL APPLICATIO
100mA 500mA
4.35V TO 5.5V
FROM
USB
4.7µF
1Ω
USB Powered Battery Charger and Power Manager
MODE
V
IN
GND
LTC4410
CHP
USBP
IRLML6401
3.4k
1%
1M
BATTERY
CHARGER
CURRENT
LOAD
CURRENT
0mA
440mA
V
OUT
4.7µF
SYSTEM POWER
SUPPLY
200mA
OFF ON
SHDN
V
CC
TIMER
PROG
BAT
NTC
GND
1-CELL
Li-Ion
240mA
LTC4053
0.1µF
0mA
4410 TA01
USB
LTC4410
MODE
MODE
500mA
1
100mA
0
SUSPEND
1
LTC4053
SHDN
1
1
0
sn4410 4410fs
U
System Load Step Response
5µs/DIV
4410 TA02
U
U
1
LTC4410
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
IN
1
GND 2
MODE 3
6 V
OUT
5 CHP
4 USBP
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
ORDER PART
NUMBER
LTC4410ES6
S6 PART MARKING
LTK8
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 100°C/W TO 150°C/W
DEPENDING ON PC BOARD LAYOUT
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating V
IN
Range
Quiescent Current—Active
CHP Compliance Voltage
Reverse Current
MODE Input Current
MODE Input High
MODE Input Low
USBP Output High
USBP Output Low
UVLO and USBP Threshold
UVLO and USBP Hysteresis
CHP Output Current
The
●
denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted.
CONDITIONS
●
MIN
4.35
TYP
500
80
MAX
5.5
700
125
4.0
3.5
UNITS
V
µA
µA
V
V
µA
µA
µA
V
V
V
mV
V
mV
µA
µA
µA
µA
µA
µA
100mA Mode (MODE = Low)
500mA Mode (MODE = High)
MODE = 5V, I
VOUT
= 500mA
MODE = 0V, I
VOUT
= 0mA
V
OUT
= 4V, V
IN
= 0V
MODE = 0V
MODE = 5V
●
●
0
0
1
0.1
0.1
1.2
5
5
5
0.4
1M Resistor to GND, V
IN
= 5V
1M Resistor to V
IN
, V
IN
= 3.5V
Measured on V
IN
Rising
Measured on V
IN
MODE = High, I
VOUT
= 0mA (Note 2)
MODE = High, I
VOUT
= 500mA (Note 2)
MODE = High, I
VOUT
= 500mA, T
A
≥
0°C, (Note 2)
MODE = High, I
VOUT
= 500mA, T
A
< 0°C, (Note 2)
MODE = Low, I
VOUT
= 0mA (Note 2)
MODE = Low, I
VOUT
= 100mA (Note 2)
●
4.8
4.05
80
470
460
450
430
4.98
20
4.2
100
0
500
500
500
370
470
100
4.35
120
30
530
540
550
510
●
●
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.
sn4410 4410fs
2
U
W
U
U
W W
W
LTC4410
TYPICAL PERFOR A CE CHARACTERISTICS
I
REF
Turn-Off Response
5V
0V
MODE PIN
0mA
CHP CURRENT
INTO A 3.4k
RESISTOR
0mA
1µs/DIV
4410 G01
CHP CURRENT
INTO A 3.4k
RESISTOR
I
REF
(µA)
370µA
I
REF
vs V
CHP
(MODE = 0)
450
400
350
R
DS(ON)
(mΩ)
T
A
= 25°C
R
DS(ON)
(mΩ)
300
I
REF
(µA)
250
200
150
100
50
0
0
1
2
3
V
CHP
(V)
4410 G04
4
Reverse Current vs Temperature
5.0
4.5
4.0
100
90
80
70
REVERSE CURRENT (µA)
3.5
2.5
2.0
1.5
1.0
0.5
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80
100
I
CC
(µA)
3.0
U W
5
6
CHP Current with I
LOAD
Step
400
I
REF
vs V
IN
(MODE = 0)
T
A
= 25°C
350
300
500mA
0mA
500µA
500mA LOAD STEP
250
200
150
10µs/DIV
4410 G02
100
50
0
0
1
2
3
V
IN
(V)
4
5
6
4410 G03
R
DS(ON)
vs V
IN
176
174
200
250
R
DS(ON)
vs Temperature
T
A
= 25°C
172
170
168
166
164
162
4.2
50
150
100
4.4
4.6
4.8 5.0
V
IN
(V)
5.2
5.4
5.6
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4410 G06
4410 G05
I
CC
vs Temperature
60
50
40
30
20
10
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80
100
4410 G07
4410 G08
sn4410 4410fs
3
LTC4410
PI FU CTIO S
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).
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).
BLOCK DIAGRA
M1
×1
R1
370µA
M2
×1000
BODY
SWITCH
MODE
3
S1
USBP
–
+
+
R3
M3
THERMAL
SHUTDOWN
5
CHP
6
V
OUT
2
GND
4
–
+
W
U
U
U
V
IN
1
VB
R2
–
REF
1.25V
4
USBP
4410 BD
sn4410 4410fs
LTC4410
OPERATIO
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
U
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.
sn4410 4410fs
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