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LTC4410 USB Power Manager in ThinSOT
FEATURES

DESCRIPTIO
Manages Total Power Between a USB Peripheral and Battery Charger Minimal Voltage Drop (100mV at 500mA) Ultralow Battery Drain: 1A 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(R)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 peripheral 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 (80A in 500mA MODE) that is compliant with USB Suspend Mode. The LTC4410 is available in the low profile (1mm) SOT-23 (ThinSOTTM) package.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S

Cellular Phones PDAs Digital Cameras MP3 Players Battery Backup Systems
TYPICAL APPLICATIO
100mA 500mA 4.35V TO 5.5V FROM USB 4.7F 1
USB Powered Battery Charger and Power Manager
MODE VIN GND LTC4410 CHP USBP IRLML6401 3.4k 1% 1M
BATTERY CHARGER CURRENT LOAD CURRENT 0mA 440mA
VOUT 4.7F
SYSTEM POWER SUPPLY
200mA
OFF ON
SHDN VCC TIMER
PROG
BAT NTC GND 1-CELL Li-Ion
240mA
LTC4053
0.1F
0mA
4410 TA01
USB LTC4410 MODE MODE 500mA 1 100mA 0 SUSPEND 1
LTC4053 SHDN 1 1 0
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System Load Step Response
5s/DIV
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LTC4410
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW VIN 1 GND 2 MODE 3 6 VOUT 5 CHP 4 USBP
VIN, VOUT Voltages ...................................... -0.3V to 6V USBP, MODE, CHP Voltage ........................ -0.3V to 6V IVOUT (Note 5) ............................................................ 2A Operating Ambient Temperature Range LTC4410E (Notes 3, 4) ........................-40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC4410ES6 S6 PART MARKING LTK8
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125C, JA = 100C/W TO 150C/W DEPENDING ON PC BOARD LAYOUT
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Operating VIN 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 TA = 25C. VIN = 5V unless otherwise noted.
CONDITIONS
MIN 4.35
TYP 500 80
MAX 5.5 700 125 4.0 3.5
UNITS V A A V V A A A V V V mV V mV A A A A A A
100mA Mode (MODE = Low) 500mA Mode (MODE = High) MODE = 5V, IVOUT = 500mA MODE = 0V, IVOUT = 0mA VOUT = 4V, VIN = 0V MODE = 0V MODE = 5V

0 0 1 0.1 0.1 1.2
5 5 5 0.4
1M Resistor to GND, VIN = 5V 1M Resistor to VIN, VIN = 3.5V Measured on VIN Rising Measured on VIN MODE = High, IVOUT = 0mA (Note 2) MODE = High, IVOUT = 500mA (Note 2) MODE = High, IVOUT = 500mA, TA 0C, (Note 2) MODE = High, IVOUT = 500mA, TA < 0C, (Note 2) MODE = Low, IVOUT = 0mA (Note 2) MODE = Low, IVOUT = 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 0C to 70C. Specifications over the -40C to 85C 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 125C 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.
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LTC4410 TYPICAL PERFOR A CE CHARACTERISTICS
IREF Turn-Off Response
5V 0V MODE PIN
0mA
CHP CURRENT INTO A 3.4k RESISTOR
0mA
1s/DIV
4410 G01
CHP CURRENT INTO A 3.4k RESISTOR
IREF (A)
370A
IREF vs VCHP (MODE = 0)
450 400 350
RDS(ON) (m)
TA = 25C
RDS(ON) (m)
300
IREF (A)
250 200 150 100 50 0 0 1 2 3 VCHP (V)
4410 G04
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Reverse Current vs Temperature
5.0 4.5 4.0 100 90 80 70
REVERSE CURRENT (A)
3.5
2.5 2.0 1.5 1.0 0.5 0 -60 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100
ICC (A)
3.0
UW
5 6
CHP Current with ILOAD Step
400
IREF vs VIN (MODE = 0)
TA = 25C 350 300
500mA 0mA 500A 500mA LOAD STEP
250 200 150
10s/DIV
4410 G02
100 50 0 0 1 2 3 VIN (V) 4 5 6
4410 G03
RDS(ON) vs VIN
176 174
200 250
RDS(ON) vs Temperature
TA = 25C
172 170 168 166 164 162 4.2
50 150
100
4.4
4.6
4.8 5.0 VIN (V)
5.2
5.4
5.6
0 -50
-25
0 25 50 TEMPERATURE (C)
75
100
4410 G06
4410 G05
ICC vs Temperature
60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100
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LTC4410
PI FU CTIO S
VIN (Pin 1): Positive Input Supply. When VIN > 4.2V, the internal undervoltage lockout enables the main switch that connects VIN to VOUT. Bypass VIN with a 10F ceramic capacitor and a 1 resistor in series or use a 10F capacitor with at least 1 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 IVOUT/ 1000. When MODE is low, the current out of CHP will be IVOUT/1000 + 370A (typical). USBP (Pin 4): USB Voltage Present Output. This pin goes high when VIN 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. VOUT (Pin 6): LTC4410 Output. Bypass this pin with a 10F or larger X5R ceramic capacitor. This capacitor may be omitted if other circuitry connected to VOUT contains a bypass capacitor. When VOUT > VIN, the internal switch is held off, resulting in very low battery drain current (1A typical).
BLOCK DIAGRA
M1 x1 R1 370A
M2 x1000
BODY SWITCH
MODE 3
S1 USBP
-
+
+
R3
M3
THERMAL SHUTDOWN 5 CHP 6 VOUT 2 GND
4
-
+
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VIN 1
VB
R2
-
REF 1.25V 4 USBP
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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 battery 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 VOUT > VIN or VIN < 4.2V (typ). A replica of the IVOUT current equal to IVOUT/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 VIN > 4.2V, the internal USB present comparator forces the USBP pin high. This signal can be used to detect
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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 370A current reference (IREF). When active (MODE pin low), the total current sourced out of CHP is IVOUT/1000 +IREF. 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 IVOUT/1000. The MODE controlled current offset makes it possible to configure 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 (80A, 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 VOUT > VIN, the LTC4410 transitions to low power mode, draining 1A (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.
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LTC4410
APPLICATIO S I FOR ATIO
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 conducting into the USB port when a wall adapter is present. The pull-down resistor, R1, is to assure that MP1 is on
100mA 500mA 4.35V TO 5.25V FROM USB MP1
4.7F 1
D1 5V WALL ADAPTER 750mA R1 1k
OFF ON
0.1F
Figure 1. USB Power Management and Wall Adapter Power
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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.
ILOAD MODE VIN GND LTC4410 CHP USBP MP2 R3 4.87k 1% MN1 1M R2 3.4k 1% VOUT 4.7F SYSTEM POWER SUPPLY SHDN VIN TIMER
PROG
W
UU
BAT NTC GND 1-CELL Li-Ion
4410 F01
LTC4053
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LTC4410
APPLICATIO S I FOR ATIO
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
MODE 5V WALL ADAPTER C1 + 4.7F R1 1 VIN GND LTC4410 CHP
OFF ON
SHDN VIN
PROG
LTC4053
C2 0.15F
+
TIMER
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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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, RPROG (R2 and R3) for the chargers are 2k, resulting in a 750mA charge current. In this application, the total current out of the wall adapter will never exceed 750mA.
OFF ON VOUT SHDN VIN C3 4.7F TIMER C4 0.1F LTC4053
PROG
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BAT NTC GND BAT1
+
USBP R2 2k
+
R3 2k
BAT NTC GND BAT2
4410 F02
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LTC4410
PACKAGE DESCRIPTIO
0.62 MAX
0.95 REF
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.20 BSC 1.00 MAX DATUM `A'
0.30 - 0.50 REF
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
RELATED PARTS
PART NUMBER LTC1733 LTC1734 LTC1734L LTC4053 LTC4054 LTC4055 LTC4412 DESCRIPTION Li-Ion Linear Charger with Thermal Regulation 200mA to 700mA Li-Ion Charger in ThinSOT 50mA to 180mA Li-Ion Charger in ThinSOT USB Li-Ion Battery Charger 800mA Li-Ion Battery Charger in ThinSOT USB Power Controller and Li-Ion Linear Charger PowerPathTM Controller in ThinSOT COMMENTS Standalone Charger, No External MOSFET, Diode or Sense Resistor Tiny Design, No Blocking Diode, No Sense Resistor Tiny Design, High Accuracy for Low Charge Current, No Blocking Diode, No Sense Resistor Operates from USB Port, 100mA/500mA Charge Capability, Standalone Charger Standalone Charger, Thermal Regulation, C/10 Charge Termination Load Dependent Charging Guarantees USB Input Current Compliance, Automatic Battery Switchover when Supply is Removed, Tiny 4mm x 4mm QFN Package More Efficient than Diode OR'ing, Automatic Switching Between DC Sources, Simplified Load Sharing, 3V VIN 28V
PowerPath is a trademark of Linear Technology Corporation.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
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S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 - 0.45 6 PLCS (NOTE 3) 0.80 - 0.90 0.01 - 0.10 0.09 - 0.20 (NOTE 3) 1.90 BSC
S6 TSOT-23 0302
LT/TP 1203 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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