Diodes API9221 User Manual

API9221

CAR/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

Description

The API9221 has two supply inputs for highly integrated portable applications, enabling charging from a USB host, wall adapter, or car adapter.

The

pin indicates to a host controller that a safe and

PPR

valid supply is connected to either VUSB or VDC. The hig her charge current option from VDC will take priority if both supplies are connected. The host controller can control the state of charging via the enable pin

. The API9221

implements the constant current/constant voltage (CC/CV) charge algorithm for Lithium based battery cells. The connected cell will be charged to 4.2V with an accuracy of 1% over the entire temperature range. The termination

current is programmable via an external resistor, R The

reached, and is reset by

pin indicates when the termination current is

CHG

EN , power off, or battery below

3.9V. The maximum charge current can be programmed independently via the resistors R

IUSB

and R

IVDC

The API9221 comes with several protection features. To prevent system damage, the VUSB pin uses over voltage

NEW PRODUCT

protection (OVP) at 5.4V, and the VDC OVP is at 6.9V. Above these levels, the non-operating device is protected against damage up to 28V. For control and system start-up the API9221 has a current limited linear regulator.

To protect the chip against excessive power dissipation, temperature monitoring is integrated, which folds back the current to a safe level. As the temperature rises, this foldback begins at 125°C without completely interrupting charging.

Applications

• Handheld Consumer Devices

• Cell Phones, PDAs, MP3 Players

• Handheld Test Equipment

• Digital Still Cameras

• Multimedia players

Pin Assignments

(Top View)

VDC

PPR

CHG

IMIN

2 3

Exposed Pad

4 5

VUSB

U-DFN4030-12

IMIN

Features

• Linear Lithium Ion / Lithium Polymer charging IC

• Supplied from USB host or car/wall adapter

• Overvoltage protection USB: 5.4V, wall:6.9V

• Supply inputs safe up to 28V

• Fast charging with maximum current of 1.2A

• Integrated linear regulator of 4.9V at 10mA with current limit

• Separate resistor-programmable charging current for wall and USB

• Resistor programmable end-of-charge

• Current limit on USB bypass path

• Indicator pins for charging and power present

• Enable pin to enable host control charging

• Reverse current protection

• Thermal protection

• U-DFN4030-12: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.

VDC_LDO

BAT

USB_BYP

IVDC

GND

IUSB

Typical Application Circuit

DC Input

USB Input

OFF

API9221

Document number: DS32204 Rev. 2 - 2

VDC

VUSB

GND

API9221

IMIN IUSB IVDC

IMIN

IUSB

VDC_LDO

BAT

USB_BYP

PPR

CHG

IVDC

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To Battery

I/O_VDD

To MCU

I/O_VDD

LDO Output

USB_BYP

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Pin Descriptions

Name Pin # Descriptions

VDC 1

VUSB 2

PPR

NEW PRODUCT

CHG

IMIN 6

IUSB 7

GND 8 Ground Ground return path.

IVDC 9

USB_BYP 10

BAT 11 Battery connector

VDC_LDO 12 LDO output

API9221

CAR/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

The recommended input to this pin is 4.5V to 6.7V with a maximum safe value of Input pin from a wall AC/DC or car adapter

USB Host device input

Power present

signal output, active-low

Charge indicator

output, active-low

Charge enable

input, active-low Current setting for

end-of-charge state

Current setting, USB Power

Current setting, wall or car adapter

USB Bypass output

28V. If a sufficient voltage is detected on VDC, no charge current is taken from

the VUSB pin. Internal OVP trips at 6.9V. The input current can be programmed

with a resistor at IVDC (pin 9). Decoupling with a 1μF ceramic capacitor is

recommended.

The recommended input to this pin is 4.5V to 5.3V with a maximum safe value of

28V. Internal OVP trips at 5.4V. The supply current drawn at this pin is the sum

of the charge current and the USB_BYP current. Decoupling with a 1μF ceramic

capacitor is recommended. Special attention has to be given to the maximum

capacitance on the USB connection. Refer to the USB standard.

The power present pin can indicate to a host processor that an external source is

present and that current can be derived from the input. This is an open drain

output pin, which goes LOW when a valid source voltage is connected to either

VUSB or VDC. If connected to a processor I/O a pull up resistor should be

utilized.

Alternatively this pin can be used to drive an indicator LED up to 10mA.

Open drain pin is pulled LOW when charging is performed. Goes high when

charge current reaches IMIN. Remains high (including top-up), until the battery

voltage falls below 3.9V or the device is power cycled or

connected to a processor I/O a pull up resistor should be utilized.

Alternatively this pin can be used to drive an indicator LED up to 10mA.

Logic level input pin to control charging from an external processor. An internal

600kΩ (nominally) pull-down resistor is provided, This pin normally requires a

pull up resistor when connected to a processor I/O.

The end-of-charge current is set by a resistor connected from this pin to GND.

This applies to charging from either VDC or VUSB.

The USB input maximum charging current is set by a resistor connected from this

pin to GND. This current is also limited by a thermally controlled current fold-

back circuit.

VDC input maximum charging current is set by a resistor connected from this pin

to GND. This current is also limited by a thermally controlled current fold-back

circuit.

Provides an external load path from the USB input, with current limiting. Protected

against reverse current.

Connect this pin to the positive terminal of the battery. This pin is also used to

monitor the charge state of the battery. It is not recommended to operate the part

without a battery connected to this pin. Protected against reverse current.

Low current linear regulator for system supply, available when a valid VDC input

supply is used. Stabilize with a 0.1F to 1F ceramic capacitor to ground.

Protected against reverse current.

is cycled. If

API9221

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Functional Block Diagram

API9221

CAR/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

NEW PRODUCT

API9221

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Absolute Maximum Ratings

Symbol Parameter Rating Unit

VDC, VUSB to GND -0.3 to 28V V

USB_BYP, VDC_LDO -0.3 to 7V V

ESD Susceptibility (Note 2)

HBM Human Body Model 2 kV

MM Machine Model 200 V

Thermal Resistance (Note 3)

Symbol Parameter Rating Unit



NEW PRODUCT



CHG

Junction to Ambient 41 Junction to Case 3.5

CAR/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

, IMIN, IVDC, IUSB, BAT -0.3 to 7V

PPR

-0.3 to 7V

API9221

°C/W

Recommended Operating Conditions (Note 4)

Symbol Parameter Rating Unit

Ambient Temperature Range -40 to +85 °C

VUSB

VDC

VDC_CHRG

USB_CHRG

Notes: 2. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting this device.

3. Test condition for U-DFN4030-12: Measured on approximately 1” square of 1 oz copper.

4. The device function is not guaranteed outside of the recommended operating conditions.

USB-BYP

LDO

Supply Voltage (VUSB) 4.5 to 5.3 V Supply Voltage (VDC) 4.5 to 6.7 V Typical Adapter Charge Current Typical USB Charge Current Typical USB Bypass Current

Typical LDO Current

0.1 to 1.2

46.5 to 465 0 to 200

0 to 10

A mA mA mA

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CAR/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

Electrical Characteristics

API9221 is tested at VDC = VUSB = 5V at an ambient temperature of +25°C unless otherwise noted.

Symbol Parameter Test Conditions Min Typ. Max Unit

CHARGER POWER-ON THRESHOLDS

Rising VUSB/VDC Threshold Falling VUSB/VDC Threshold

Rising VDC or VUSB, relative to V

BAT

Falling VDC or VUSB, relative to V

BAT

BAT Pin Sink Current VDC Pin Supply Current VUSB Pin Supply Current

VDC/VUSB Pin Supply Current

Final Output Voltage, BAT Pin

VDC Linear ON-resistance VUSB Linear ON-resistance

VDC Pin Output Voltage VDC Constant Current

VDC Trickle Charge Current

= 4.0V, use

BAT

CHG

pin to indicate the comparator output

= 4.0V, use

BAT

CHG

pin to indicate the comparator output

= HIGH or both inputs

are floating

= HIGH, I

= HIGH, USB_BYP

LDO

= 0

disconnected

= LOW, I

LDO

= 0,

USB_BYP disconnected

Load = 10mA 4.158 4.2 4.242 V Load = 10mA (T

= +25°C)

BAT

=3.8V, I

VDC

= 0.3A,

(TJ = +25°C)

= 3.8V, I

BAT

= +25°C)

= 3.8V

BAT

= 12.4k,

IVDC

= 2.7V to 3.8V

BAT

= 12.4k,

IVDC

= 2.2V, given as a %

BAT

of the I

VDC_CHARGE

USB

= 0.3A,

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VPO

INPUT VOLTAGE OFFSET

VOSHC

VOSLC

STANDBY CURRENT I

STANDBY

VDC

VUSB

VDC_VUSB

VOLTAGE REGULATION

BATMAX

DS(ON)_VDC

DS(ON)_VUSB

CHARGE CURRENT V

IVDC

VDC_CHRG

VDC_TRKL

API9221

3.4 3.9 4.2 V

3.2 3.7 4.0 V

- 150 250 mV

20 80 - mV

- 0.05 0.5 µA

- 380 460 µA

- 330 400 µA

- 0.63 1.1 mA

4.174 4.2 4.226 V

- 550 - m

1.22 1.25 1.28 V 450 550 600 mA

15 17 19 %

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