Datasheet

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LTC4089-3

40893f

For more information www.linear.com/4089-3

APPLICATIONS

HVIN

BOOST

HVEN

4.7µF

10µF

4.7µF

1µF

TIMER

CLPROG

LTC4089-3

GND PROG

HVOUT

HVPR

OUT

BAT

0.1µF

100k2k

5V (NOM)

FROM USB

CABLE V

BUS

HIGH (6V-36V)

VOLTAGE INPUT

Li-Ion BATTERY

TO LDOs

EGS

, ETC.

40893 TAO1a

OUT

(TYP)

BAT

+ 0.3V

BAT

AVAILABLE INPUT

HV INPUT

USB ONLY

BAT ONLY

10µH

0.1µF

USB Power Manager with

High Voltage Switching Charger

The LT C

4089-3 is a USB power manager plus high voltage

Li-Ion battery charger. This device controls the total cur-

rent used by the USB peripheral for operation and battery

charging. Battery charge current is automatically reduced

such that the sum of the load current and the charge cur-

rent does not exceed the programmed input current limit.

The LTC4089-3 also accommodates high voltage power

supplies, such as 12V AC/DC wall adapters, Firewire, or

automotive power.

The LTC4089-3 provides an adaptive output that tracks

the battery voltage for high efﬁciency charging from the

high voltage input. This 3.95V version of the the standard

LTC4089 is intended for applications which have extended

battery lifetime requirements or those that require high

temperature (approximately >60°C) operation or stor-

age. Under these conditions, a reduced ﬂoat voltage will

trade-off initial cell capacity for the beneﬁt of increased

capacity retention over the life of the battery. The charge

current is programmable and an end-of-charge status

output (CHRG) indicates full charge. Also featured are

programmable total charge time, an NTC thermistor input

used to monitor battery temperature while charging and

automatic recharging of the battery.

L, LT, LTC and LTM are registered trademarks and Bat-Track, PowerPath and ThinSOT are

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 6522118, 6700364, 7733061.

Portable USB Devices—GPS Receivers, Cameras,

MP3 Players, PDAs

Seamless Transition Between Power Sources: Li-Ion

Battery, USB, and 6V to 36V External Supply

High Efﬁciency 1.2A Charger from 6V to 36V Input

with Adaptive Output Control

3.95V Float Voltage Improves Battery Lifespan and

High Temperature Safety Margin

Load Dependent Charging from USB Input

Guarantees Current Compliance

215m Internal Ideal Diode plus Optional External

Ideal Diode Controller Provides Low Loss Power

Path When External Supply/USB Not Present

Constant-Current/Constant-Voltage Operation with

Thermal Feedback to Maximize Charging Rate

without Risk of Overheating

Selectable 100% or 20% Current Limit (e.g., 500mA/

100mA) from USB Input

Preset 3.95V Charge Voltage with ±0.8% Accuracy

C/10 Charge Current Detection Output

NTC Thermistor Input for Temperature Qualiﬁed

Charging

Tiny (6mm × 3mm × 0.75mm) 22-Lead DFN Package

LTC4089 High Voltage

Battery Charger Efﬁciency

BATTERY VOLTAGE (V)

2.5

EFFICIENCY (%)

3.5

40893 TA01b

4.5

CC CURRENT = 970mA

NO OUTPUT LOAD

FIGURE 10 SCHEMATIC

WITH R

PROG

= 52k

HVIN = 8V

HVIN = 12V

HVIN = 24V

HVIN = 36V

TYPICAL APPLICATION

DESCRIPTIONFEATURES

Summary of content (24 pages)

PAGE 1
LTC4089-3 USB Power Manager with High Voltage Switching Charger FEATURES n n n n n n n n n n n DESCRIPTION Seamless Transition Between Power Sources: Li-Ion Battery, USB, and 6V to 36V External Supply High Efficiency 1.2A Charger from 6V to 36V Input with Adaptive Output Control 3.
PAGE 2
LTC4089-3 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2, 3, 4, 5) TOP VIEW Terminal Voltage BOOST ....................................................... –0.3V to 50V BOOST above SW......................................................25V HVIN, HVEN ............................................... –0.3V to 40V IN, OUT, HVOUT t < 1ms and Duty Cycle < 1%................... –0.3V to 7V DC............................................................. –0.3V to 6V BAT....................................
PAGE 3
LTC4089-3 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. HVIN = 12V, BOOST = 17V, VIN = 5V, VBAT = 3.7V, HVEN = 12V, HPWR = 5V, RPROG = 100k, RCLPROG = 2k, SUSP = 0V, unless otherwise noted.
PAGE 4
LTC4089-3 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. HVIN = 12V, BOOST = 17V, VIN = 5V, VBAT = 3.7V, HVEN = 12V, HPWR = 5V, RPROG = 100k, RCLPROG = 2k, SUSP = 0V, unless otherwise noted.
PAGE 5
LTC4089-3 TYPICAL PERFORMANCE CHARACTERISTICS Battery Regulation (Float) Voltage vs Temperature VFLOAT Load Regulation 4.05 TA = 25°C, unless otherwise specified. 3.970 RPROG = 34k 3.965 4.00 Battery Current and Voltage vs Time 5 VIN = 5V IBAT = 2mA 4 VFLOAT (V) VFLOAT (V) 3.85 3.955 3.950 3.945 3.940 3.80 0 200 400 600 IBAT (mA) 3.930 –50 1000 800 40893 G01 0 50 25 TEMPERATURE (°C) 40893 G03 800 IBAT (mA) 300 100 VIN = 5V VBAT = 3.
PAGE 6
LTC4089-3 TYPICAL PERFORMANCE CHARACTERISTICS High Voltage Regulator Maximum Load Current, L = 10µH High Voltage Regulator Maximum Load Current, L = 33µH 1.6 1.8 1.5 1.6 TYPICAL 450 1.2 1.3 MINIMUM 1.2 MINIMUM 1.1 1.0 0.9 0.9 10 15 20 VIN (V) 25 30 35 5 10 20 VIN (V) 15 25 0 35 30 SWITCHING FREQUENCY (kHz) 760 740 720 700 680 660 640 0 25 50 75 100 125 150 TEMPERATURE (°C) 40893 G12 2.0 1.8 700 600 500 400 300 200 0 1 0 2 3 HVOUT (V) 1.4 1.2 1.0 0.8 0.6 0.
PAGE 7
LTC4089-3 TYPICAL PERFORMANCE CHARACTERISTICS Input Disconnect Waveforms Input Connect Waveforms VIN 5V/DIV VOUT 5V/DIV VIN 5V/DIV VOUT 5V/DIV IIN 0.5A/DIV IBAT 0.5A/DIV IIN 0.5A/DIV IBAT 0.5A/DIV VBAT = 3.85V IOUT = 100mA 1ms/DIV TA = 25°C, unless otherwise specified. Response to HPWR HPWR 5V/DIV IIN 0.5A/DIV IBAT 0.5A/DIV 40893 G18 VBAT = 3.85V IOUT = 100mA 40893 G19 1ms/DIV VBAT = 3.85V IOUT = 50mA Wall Disconnect Waveforms Wall Connect Waveforms SUSP 5V/DIV VOUT 5V/DIV IWALL 0.
PAGE 8
LTC4089-3 PIN FUNCTIONS GND (Pins 1, 2, Exposed Pad Pin 23): Ground. Tie the GND pin to a local ground plane below the LTC4089-3 and the circuit components. The exposed package pad is ground and must be soldered to the PC board for proper functionality and for maximum heat transfer (use several vias directly under the LTC4089-3). CHRG (Pin 8): Open-Drain Charge Status Output. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET.
PAGE 9
LTC4089-3 PIN FUNCTIONS OUT (Pin 13): Voltage Output. This pin is used to provide controlled power to a USB device from either USB VBUS (IN), an external high voltage supply (HVIN), or the battery (BAT) when no other supply is present. The high voltage supply is prioritized over the USB VBUS input. OUT should be bypassed with at least 4.7µF to GND. while in suspend mode.
PAGE 10
LTC4089-3 BLOCK DIAGRAM D2 C3 20 21 BOOST HVIN SW Q1 L1 19 + + D1 – R S – Q Q DRIVER DRIVER OSCILLATOR 4 GM 10pF + + 1.8V ENABLE 350mV R3 22 HVOUT – VC + – HVEN 3 – 3.6V + – C1 + 75mV (RISING) 25mV (FALLING) + C4 – 4.25V (RISING) 3.
PAGE 11
LTC4089-3 OPERATION (Refer to Block Diagram) The LTC4089-3 is a complete PowerPath™ controller for battery-powered USB applications. The LTC4089-3 is designed to receive power from a low voltage source (e.g., USB or 5V wall adapter), a high voltage source (e.g., Firewire/IEEE1394, automotive battery, 12V wall adapter, etc.), and a single-cell Li-Ion battery.
PAGE 12
LTC4089-3 OPERATION Input Current Limit Whenever the input power path is enabled (i.e., SUSP = 0V and HVIN = 0V) and power is available at IN, power is delivered to OUT. The current limit and charger control circuits of the LTC4089-3 are designed to limit input current as well as control battery charge current as a function of IOUT.
PAGE 13
LTC4089-3 OPERATION The battery charger will reduce its current as needed to ensure that the USB specification is not exceeded. If the load current is greater than the current limit, the output voltage will drop to just under the battery voltage where the ideal diode circuit will take over and the excess load current will be drawn from the battery. In USB applications, the minimum value for RCLPROG should be 2.1k.
PAGE 14
LTC4089-3 OPERATION LTC4089 CONSTANT I0N SLOPE: 1/RDIO(ON) CONSTANT R0N CURRENT (A) IMAX IFWD SLOPE: 1/RFWD 0 VFWD SCHOTTKY DIODE CONSTANT V0N FORWARD VOLTAGE (V) 40893 F03 Figure 3. LTC4089-3 Versus Schottky Diode Forward Voltage Drop OUT is sufficient to keep a transition from input power to battery power from causing significant output voltage droop.
PAGE 15
LTC4089-3 OPERATION An external capacitor on the TIMER pin sets the total minimum charge time. When this time elapses the charge cycle terminates and the CHRG pin assumes a high impedance state, if it has not already done so. While charging in constant-current mode, if the charge current is decreased by thermal regulation or in order to maintain the programmed input current limit the charge time is automatically increased.
PAGE 16
LTC4089-3 OPERATION Consider, for example, a USB charge condition where RCLPROG = 2k, RPROG = 100k and CTIMER = 0.1µF. This corresponds to a three hour charge cycle. However, if the HPWR input is set to a logic low, then the input current limit will be reduced from 500mA to 100mA. With no additional system load, this means the charge current will be reduced to 100mA. Therefore, the termination timer will automatically slow down by a factor of five until the charger reaches constant-voltage mode (i.e.
PAGE 17
LTC4089-3 OPERATION resistance of the NTC thermistor rises. The LTC4089-3 is designed to go into hold mode when the value of the NTC thermistor increases to 2.82 times the value of RNOM. This resistance is RCOLD. For a Vishay NTHS0603N02N1002J thermistor, this value is 28.2k which corresponds to approximately 0°C. The hot and cold comparators each have approximately 2°C of hysteresis to prevent oscillation about the trip point. Grounding the NTC pin will disable the NTC function.
PAGE 18
LTC4089-3 APPLICATIONS INFORMATION USB and 5V Wall Adapter Power Although the LTC4089-3 is designed to draw power from a USB port, a higher power 5V wall adapter can also be used to power the application and charge the battery (higher voltage wall adapters can be connected directly to HVIN). Figure 5 shows an example of combining a 5V wall adapter and a USB power input. With its gate grounded by 1k, P-channel MOSFET MP1 provides USB power to the LTC4089-3 when 5V wall power is not available.
PAGE 19
LTC4089-3 APPLICATIONS INFORMATION The high voltage regulator output capacitor controls output ripple, supplies transient load currents, and stabilizes the regulator control loop. Ceramic capacitors have very low equivalent series resistance (ESR) and provide the best ripple performance. A good value is 10µF. Use X5R or X7R types, and note that a ceramic capacitor biased with VHVOUT will have less than its nominal capacitance. Table 2 lists several capacitor vendors.
PAGE 20
LTC4089-3 APPLICATIONS INFORMATION where RCOLD is the resistance ratio of RNTC at the desired cold temperature trip point. To shift the trip points to higher temperatures use the following equation: RNOM = RHOT •RNTC at 25°C 0.484 trip points. Continuing the forementioned example with a desired hot trip point of 50°C: RNOM = = where RHOT is the resistance ratio of RNTC at the desired hot temperature trip point. The following example uses a 100K R-T Curve 1 Thermistor from Vishay Dale.
PAGE 21
LTC4089-3 APPLICATIONS INFORMATION Power Dissipation and High Temperature Considerations The die temperature of the LTC4089-3 must be lower than the maximum rating of 110°C. This is generally not a concern unless the ambient temperature is above 85°C. The total power dissipated inside the LTC4089-3 depends on many factors, including input voltage (IN or HVIN), battery voltage, programmed charge current, programmed input current limit, and load current.
PAGE 22
LTC4089-3 APPLICATIONS INFORMATION C1 AND D1 GND PADS SIDE-BY-SIDE AND SEPERATED WITH C3 GND PAD MINIMIZE D1, L1, C3, U1, SW PIN LOOP 40893 F09 Figure 9. Ground Currents Follow Their Incident Path at High Speed. Slices in the Ground Plane Cause High Voltage and Increased Emissions. VIN and VHVIN Bypass Capacitor U1 THERMAL PAD SOLDERED TO PCB. VIAS CONNECTED TO ALL GND PLANES WITHOUT THERMAL RELIEF. MINIMIZE TRACE LENGTH Figure 8.
PAGE 23
LTC4089-3 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DJC Package 22-Lead Plastic DFN (6mm × 3mm) (Reference LTC DWG # 05-08-1714 Rev Ø) 0.889 0.70 ±0.05 R = 0.10 0.889 3.60 ±0.05 1.65 ±0.05 2.20 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 5.35 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 3.
PAGE 24
LTC4089-3 APPLICATIONS INFORMATION D2 SD101AWS VIN 6V TO 36V VIN E1 + E2 GND 21 C9 22µF 50V R1 1M 1% C1 1µF 50V 20 HVIN BOOST SW 19 L1 C2 10µH 0.1µF 6.3V SLF6028T-100M1R3 E16 HVOUT C3 22µF 6.3V D1 DLFS160 JP1 VIN 1 ON 22 2 C7 1000pF 50V 3 OFF USB E3 4.35V TO 5.5V JP2 CURRENT USB 500mA 100mA 1 2 3 15 16 C4 0.1µF 10% 17 R3 2.1k 1% JP3 USB ON/OFF 1 OFF HVEN HVPR IN OUT HPWR SUSP GATE BAT TIMER CHRG 14 R4 71.5k 1% 9 2 ON HVOUT HVOUT 12 C5 4.7µF 6.