HM5082E [HMSEMI]

3A Synchronous Buck 2 Cells Li-ion Charger;


型号：	HM5082E
厂家：	H&M Semiconductor
描述：	3A Synchronous Buck 2 Cells Li-ion Charger
文件：	总9页 (文件大小：1204K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

DESCRIPTION

The HM5082 is a 3A Li-Ion battery charger. It utilizes a 500 KHz synchronous buck

converter topology to reduce power dissipation during charging. Low power

dissipation, an internal MOSFET allow a physically small charger that can be

embedded in a wide range of handheld applications. The HM5082 includes complete

charge termination circuitry, automatic recharge and a ±1% 8.4V float voltage. Battery

charge current, charge timeout and end-of-charge indication parameters are set with

external components. Additional features include shorted cell detection; temperature

qualified charging and overvoltage protection. The HM5082 is available in a ESOP8 and

DNF10 package

FEATURES



Input voltage range 4V~22V

Dynamic input current allocation for maximum charging rate

3A Maximum Charge Current

No External MOSFETs and Blocking Diode Required

Efficiency up to 95%

Constant-Current/Constant-Voltage Operation with Thermal Regulation to

Maximize Charge Rate Without Risk of Overheating

Optional Battery Temperature Monitoring Before and During Charge Automatic

Sleep Mode for Low-Power



Over Current Protection

Consumption Available in ESOP8 and DFN10

RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS

Portable Media Players

Cellular and Smart mobile phone

PDA/DSC

Handheld Battery-Powered Devices

Handheld Computers

Charging Docks and Cradles

- 1 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

PACKAGE AND APPLICATION

VIN

BAT

VIN

LV5

VBAT

R1 20R

45mR

SNS

BST

STAT

FBADJ

NTC

0.1uF

5.1K

47uF

0.1uF

4.7uH

NTC

10K

1uF

ORDING INFORMATION

Part Number

HM5082E

HM5082D

Package Type

ESOP8

DFN10

Package Qty

4000

Op Temp(°C)

-40~85

MARK INFORMATION

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HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

ABSOLUTE MAXIMUM RATINGS ⁽¹⁾

Over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER

MIN

MAX

UNIT

VIN /VBAT/SNS/LX

VIN, VBAT, SNS,LX

to GND

-0.3

BST to LX

BST,LX

-0.3

6.5

ALL OTHER PINS to

GND

VIN, BAT, SNS, LX, BST

VIN

ESD rating, Human

Body Model (HBM)

BAT, SNS, LX, GND ,BST

ESD rating,

Charging Device

Model (CDM)

Operating Junction

Temperature

Storage

Temperature Range

200

T_J

-40

-65

125

150

C

T_stg

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

These are stress ratings only, and functional operation of the device at these or any other conditions beyond those

indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated

conditions for extended periods may affect device reliability.

THERMAL CHARACTERISTICS

over operating free-air temperature range (unless otherwise noted)

THERMAL METRIC(θ_JA)

UNIT

Package thermal impedance⁽¹⁾

ESOP8

DFN8

°C/W

Package thermal impedance⁽¹⁾

(1) The package thermal impedance is calculated in accordance with JESD 51-7.

- 3 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

PINOUT

PIN FUNCTIONS

PIN Number

Pin Name

ESOP8

ESSOP10 Description

Switch pin. Connect to external inductor.

Internal charge pump boost pin.

6,7

BST

Open-Drain Charge Status Output. When the battery is

charging, this pin is pulled low by an internal N-channel

MOSFET. When the HM5082 detects an under voltage lockout

condition, STAT is forced high impedance.

STAT

NTC

NTC (Negative Temperature Coefficient) Thermistor Input.

This pin senses the

Temperature of the battery pack and stops the charger when

the temperature is out of range. Connect to GND for disabling

Battery pin.

VBAT

SNS

Detecting pin of charge current.

5V LDO output PIN. Connect a minimum 1uF capacitor

between this PIN and GND.

LV5

Positive Supply Voltage Input. Decouple with a 10µF or larger

surface mounted

VIN

Ceramic capacitor.

ePAD

GND

ePAD

Ground.

CV adjust PIN.

Connect resistor to GND increase CV voltage.

Connect resistor to VBAT decrease CV voltage.

FBADJ

- 4 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

ELECTRICAL CHARACTERISTICS

(TA=25℃, VIN = 5V, unless otherwise noted)

Symbol

V_IN

Parameter

Min Typ

Max

Units

Condition

Adapter/USB Voltage

Standby Mode

I_CC

Input Supply Current

(Charge Terminated)

Regulated Output (Float)

Voltage

V_FLOAT

V_RS

FBADJ floating

8.4

Program Charging Current

(For RS to BAT)

V_TRIKL<V_BAT<V_FLOAT

R_SNS=50mΩ,

R_SNS=25mΩ,

1000

2000

μA

I_BAT

BAT Pin Current

Standby Mode

V_BAT<V_TRIKL

100

I_TRIKL

Trickle Charge Current

V_BAT<2.3V

V_TRIKL

V_TRHYS

V_STAT

I_STAT

R_SNS=50mΩ, V_BAT

R_SNS=50mΩ

I_STAT=5mA

Trickle Charge Threshold

Trickle Charge Hysteresis

STAT Pin Output Low

5.6

100

0.5

STAT Pin Weak Pull-Down

Recharge Battery Threshold

V_STAT=5V

ΔV_REC

V_FLOAT-V_RECHRG

150

Junction Temperature in

Constant

℃

T_LIM

I_TERM

100

R_SNS=50mΩ

C/10 Terminal Current

V_INrising

V_INfalling

VIN rising

hysteresis

VIN UVLO Under Voltage Lockout of VIN

3.8

VIN OVP

V_NTC-H

VIN over voltage protect

High Temperature Protection

Threshold Voltage

Battery Temperature

%V_LV5

rising

Battery Temperature

Low Temperature Protection

Threshold Voltage

V_NTC-L

%V_LV5

KHz

falling

Frequency

500

F_OSC

- 5 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

APPLICATION INFORMATION

HM5082 is a wide range V (4V-20V), 3A 1cell

asynchronous boost Li-Ion battery charger integrates

500KHz switching frequency and full protection functions. The charge current can be programmed up

to Max 2.5A by using the external resistor for different portable applications and indicates the charger

by the external

current information simultaneous. In constant current mode, the charge current is set

sense resistor RSNS and an internal 50mV reference;

IBAT=VRS/RSNS=50mV/RSNS

When the battery voltage approaches the programmed float voltage, the charge current will start to

decrease. When the current drops to 10% of the full-scale charge current, an internal comparator turns

off charging is terminated

Input Source Qualification

After REGN amplifier powers up, the HM5082 checks the current capability of the input source. The

input source has to meet the VREG>1V to enable the chip

Battery Temperature Detection

The HM5082 continuously monitors temperature by measuring the voltage between the NTC and GND

pins. A negative or a positive temperature coefficient thermistor (NTC, PTC) and an external voltage

divider typically develop this voltage. The HM5082 compares this voltage against its internal VNTC-H

and VNTC-L thresholds to determine if charging is allowed. The temperature sensing circuit is immune

to any fluctuation in LV5, since both the external voltage divider and the internal thresholds (VNTC-H

and VNTC-L) are referenced to LV5.

The resistor values of R1 and R2 are calculated by the following equations:

For NTC Thermistors:

K1 (VNTC-H) =30%,

K2 (VNTC-L) =70%.

Automatic Recharge

Once the charge cycle is terminated, the HM5082 continuously monitors the voltage on the BAT pin

using a comparator with a 1.8ms filter time (tRECHARGE). A charge cycle restarts when the battery

voltage falls below 8.1V (which corresponds to approximately 80% to 90% battery capacity). This

ensures that the battery is kept at or near a fully charged condition and eliminates the need for periodic

charge cycle initiations.

Where RTL is the low temperature resistance and RTH is the high temperature resistance of thermistor,

as specified by the thermistor manufacturer. R1 or R2 can be omitted if only one temperature (low or

high) setting is required. Applying a voltage between the VNTC-H and VNTC-L thresholds

NTC

to pin

disables the temperature-sensing feature.

- 6 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

CV adjustment

Battery termination voltage default set to 8.4V. If other CV voltage wanted, the follow equations change

the CV voltage.

If increase CV voltage, connect a resistor from FBADJ to GND. the increased voltage determined by:

2.1

V =

R_divup

trim

If decrease CV voltage, connect a resistor from battery to FBADJ, the decreased voltage determined

V_CV 2.1

V =

 R_divdown

trim

Rdivup=156K

Rdivdown=156K/3 for 2cell

Shutdown

The HM5082 can be shut down by pulling the NTC pin to VIN. When the NTC pin is released, the internal

timer is reset and a new charge cycle starts.

Inductor Selection

A operating frequency was chosen for the buck switcher in order to minimize the size of the inductor.

However, take care to use inductors with low core loss at this frequency. To calculate the inductor

ripple current:

Charge Status Indicator (STAT)

The charge status output has two different states: strong pull-down (~5mA) and high impedance. The

strong pull-down state indicates that the HM5082 is in a charge cycle. Once the charge cycle has

terminated, the pin state is determined by under voltage lockout conditions. High impedance indicates

that the charge cycle complete.

Layout Considerations

Switch rise and fall times are kept under 5ns for maximum efficiency. To minimize radiation, the SW pin

and input bypass capacitor leads (between VIN and GND) should be kept as short as possible. A

ground plane should be used under the switching circuitry to prevent inter plane coupling. The

Exposed Pad must be connected to the ground plane for proper power dissipation. The other paths

contain only DC and/or 500KHz tri-wave ripple current and are less critical. With the exception of the

input and output filter capacitors (which should be connected to GND) all other components that return

to ground.

- 7 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

PACKAGE INFORMATION

DFN10

- 8 -

HM5082

3A Synchronous Buck 2 Cells Li-ion Charger

ESOP8

- 9 -

HM5082E [HMSEMI]

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