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Final Electrical Specifications
LTC4410 USB Power Manager in ThinSOT
January 2003
FEATURES
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DESCRIPTION
The LTC4410 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) ThinSOT package.
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 Low Profile (1mm) ThinSOTTM Package Dual Battery Charge Priority Management
APPLICATIO S
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Cellular Phones PDAs Digital Cameras MP3 Players Battery Backup Systems
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
USB Powered Battery Charger and Power Manager
100mA 500mA 4.35V TO 5.5V FROM USB 4.7F 1 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 LTC4053
BAT NTC GND 1-CELL Li-Ion
240mA
0.1F
0mA
4410 TA01
USB LTC4410 MODE MODE 500mA 1 100mA 0 SUSPEND 1
LTC4053 SHDN 1 1 0
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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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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 Operating Temperature Range LTC4410E (Note 3) ..............................-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 JA = 256C/W
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 q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 5V unless otherwise noted.
CONDITIONS
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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, IL = 500mA MODE = 0V, IL = 0mA VOUT = 4V, VIN = 0V MODE = 0V MODE = 5V
q q
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, IL = 0mA (Note 2) MODE = High, IL = 500mA (Note 2) MODE = High, IL = 500mA, TA 0C, (Note 2) MODE = High, IL = 500mA, TA < 0C, (Note 2) MODE = Low, IL = 0mA (Note 2) MODE = Low, IL = 100mA (Note 2)
q
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
q q
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.
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 which 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 IOUT/ 1000. When MODE is low, the current out of CHP will be IOUT/1000 + 370A (typical).
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LTC4410
PI FU CTIO S
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
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R3
M3
THERMAL SHUTDOWN 5 CHP 5 VOUT 2 GND
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 ILOAD current equal to ILOAD/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 when the USB voltage is present and drive an external switch to connect or disconnect a battery from the USB peripheral.
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VIN 1
VB
R2
-
REF 1.25V 4 USBP
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LTC4410
OPERATIO
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 ILOAD/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 IOUT/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.
PACKAGE DESCRIPTIO
0.62 MAX
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 0.09 - 0.20 (NOTE 3) 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
RELATED PARTS
PART NUMBER LTC1733 LTC1734 LTC1734L LTC4053 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 PowerPath 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 More Efficient than Diode OR'ing, Automatic Switching Between DC Sources, Simplified Load Sharing, 3V VIN 28V
4410i LT/TP 0103 1.5K * PRINTED IN USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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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.
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.95 REF 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 0.80 - 0.90 0.01 - 0.10 0.30 - 0.45 6 PLCS (NOTE 3) 1.90 BSC
S6 TSOT-23 0302
5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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