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PDF HB6298A-2009 Data sheet ( Hoja de datos )
| Número de pieza | HB6298A-2009 | |
| Descripción | Switchmode Single-Cell/Two-Cell Li-ion/Li Polymer Battery Charger | |
| Fabricantes | Huatai Electronics | |
| Logotipo |  |
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Huatai Electronics
HB6298A-2009.12.28
Switchmode Single-Cell/Two-Cell Li-ion/Li Polymer Battery Charger
1、 HB6298A functions
1.1、Features
● High conversion efficiency charger for
1-cell/2-cell Li-ion/Li polymer battery
● 0.5％ voltage accuracy
● Full charged voltage trimming by external
resistors
● Build-in battery detection
● Integrated power MOSFET
● Soft starting
● 300kHz PWM Oscillator frequency
● Programmable charge current up to 1.5A
● Reverse leakage protection prevents
battery drainage
● NTC Thermistor interface for battery
temperature monitor
● Status outputs for LED
● Cycle-by-cycle current limit, charge
current thermal foldback , short circuit
protection
● 18V absolute maximum voltage rating on IN
pins
● Ambient temperature range: -20℃～70℃
2、 Typical application circuit
1.2、Applications
● Handheld devices, include medical
handhelds
● Portable-DVD，PDA，cell phones and smart
phones
● Portable instruments
● Self-charging battery packs
● Stand-alone chargers
1.3、Introduction
HB6298A is an integrated 1-cell/2-cell
Li-ion/Li polymer switch-mode charge management
device, targeted at a wide range of portable
applications. HB6298A offers integrated power FET,
high-accuracy current and voltage regulation,
charge preconditioning, charge status, and charge
termination, in a small TSSOP20 package. HB6298A
charges the battary in three phase: preconditioning,
constant current(CC), and constant voltage(CV).
The charge current is programmable with an
external resistor up to 1.5A. HB6298A features
cycle-by-cycle current limit, charge current
thermal foldback and short circuit protection to
guarantee safe operation. Additional features
include NTC thermistor interface to monitor
the battery temperature.
Figure2.1、HB6298A application circuit
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1 page  
Huatai Electronics
Oscillator frequency
Internal PMOS on-resistor
Maximum duty cycle
Minimum duty cycle
DMAX
DMIN
BATTERY DETECTION
Battery detection current
during time-out
Discharge current
Discharge time
Wake current
Wake time
PROTECTION
OVP threshold voltage
Cycle-by-cycle current
limit
Short-circuit voltage
Short-circuit current
IDETECT
IDISCHARG
TDISCHARG
IWAKE
TWAKE
HB6298A-2009.12.28
400 KHz
500 mΩ
98％
0％
2
400
1
5
0.5
117
3
2
25
mA
uA
S
mA
S
％VOREG
A
V/cell
mA
5/13
5 Page 
Huatai Electronics
HB6298A-2009.12.28
then the HB6298A disables the IDETECT current and
executes the recovery method described in Condition
1. Once the battery falls below the recharge
threshold, the HB6298A clears the fault and enters
the battery absent detection routine. A POR also
clears the fault.
8.15、Output overvoltage protection
HB6298A provides a built-in overvoltage
protection to protect the device and other
components against damages if the battery voltage
gets too high, as when the battery is suddenly
removed. When an overvoltage condition is detected,
this feature turns off the PWM and STAT2 pins. The
fault is cleared once VIBAT drops to the recharge
threshold.
8.16、Inductor selection guideline
To insure the stability of the loop, in
precharge and fast charge stages, the control loop
works in continuous current conduction mode(CCM).
The current ripple formula:
ΔI
=
1
L × FS
(
VIN
− VBAT
VIN
)
×
VBAT
Where, ΔI is inductor ripple current, FS is
PWM oscillator frequency. To insure the control
loop works in CCM mode, set ΔI to precharge
current, which is 1/5 of fast charge current. The
inductor value can be calculate from input voltage.
8.17、Output capacitor selection guidelines
To insure the stability of the control loop,
as inductor value is determined， determine the
minimum output capacitor value using the following
equation:
L × C ≥ 100 ×10−12
where, L、C are the values of inductor and
output capacitor.
8.18、Application advice
1 、 For better EMI performance, connect a
resistor and a capacitor in series between pin OUT
and pin GND， as R10、C10 in figure 2.1. The
resistor is 10 Ω to 30 Ω，the capacitor is less
than 1nF.
2、Connect capacitors between VTRIM and GND,
between VTRIM and BAT, the value recommended is
0.22uF，to suppress the noise which affect the
feedback voltage.
3、Pin CELL is connected to VTSB when charging
one cell battery.
4 、 Select a schottky diode which reverse
leakage current is small for blocking diode D1,
because the diode leakage current affecting battery
self-discharge. In high voltage application,
select a normal power diode.
5、The capacitors should be placed as close as
possible to HB6298A；
6 、 VTRIM is a sensitive signal, should be
routed away from the periodical high current paths.
8.19、Full charged battery voltage trimming
（1） One cell application
Firstly, measure the full charged battery
voltage VCV , define VCV = 4.200V±△V. Determine
trimming resistor value using the following
equation:
RTRIM =（2Δ.1V00 − 0.5）R
(where R=80k)
To change VCV lower, connect the trimming
resistor between pin BAT and pin VTRIM; to change
VCV higher, connect the trimming resistor between
pin VTRIM and pin GND.
（2） Two cell application
Firstly, measure the full charged battery
voltage VCV , define VCV = 8.400V±△V.
To change VCV higher, connect the trimming
resistor between pin VTRIM and pin GND. Determine
trimming resistor value using the following
equation:
RTRIM =（2Δ.1V00 − 0.5）R
（其中 R=80 kΩ）
To change VCV lower, connect the trimming
resistor between pin VTRIM and pin BAT. Determine
trimming resistor value using following equation:
RTRIM
=（
6.300
ΔV
− 1）R
（其中 R=80 kΩ）
11/13
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HB6298A-2009.PDF ] | |
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