F e a t u r e s
ØHigh Accuracy Linear Li-Lon Battery Charger ØProgrammable Charge Current Up to 700mA ØStep-up DC-DC Converter: Fixed Output Voltage (5V)
ØInput Voltage: 0-6V
ØShort-circuit Protection
ØMinimal External Components
ØSOP8/PP Package
A p p l i c a t i o n s
ØPortable Devices and PDAs
ØMP3/MP4 Players
ØWireless Handhelds
ØGPS Receivers, etc. D e s c r i p t i o n
The IT8327 is a complete, cost effective, high- efficient solution that is ideal for Li-lon Battery Powored Mobile Supply.
VBAT is a complete constant-current/ constant voltage linear charger for one cell lithium-ion battery. The charge current of pre-charging and constant –current charging is adjustable and it can be programmed to 700mA. An external sense resistor sets the charge current with high accuracy. VOUT（5V）is a step-up DC-DC converter with internal power MOSFETs. It achieves 1A or 1.8A continuous output current over a wide input supply range with excellent load and line regulation.
The is available in a low profile SOP8/PP package.
IT8327
T y p i c a l  A p p l i c a t i o n
Figure 1: Typical Application Circuit
* The charge current I BAT =1V/R SET
*900.
* NMOS , the maximum load is up to 1A, NMOS , the maximum load is up to 1.8A.
P i n  A s s i g n m e n t
Li-lon Battery
INZOTEK
IT8327
INZOTEK IT8327
A b s o l u t e M a x i m u m R a t i n g s(Note 1)
ØVIN Voltage ……………………………………………….……………………………… - 0.3 V ～7V ØSW, PROG Voltage………………………………………………….…………….………-0.3 V ～7V ØI SW……………………………………………………………………………………………………….4A ØOperating Temperature Range (Note 2)............................................................... –40℃to 85℃ØOperating Junction Temperature (Note 3).............................................................. –40℃to 125℃ØStorage Temperature Range …………………………………………….................. –65℃to 125℃ØLead Temperature (Soldering, 10 sec)................................................................................. 300℃
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damag
e to the device.
Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The IT8327 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: This IC includes over temperature protection that is intended to protect the device during momentary overload. Junction temperature will exceed 125°C when over temperature protection is active. Continuous operation above the specified maximum operating junction temperature my impair device reliability.
E l e c t r i c a l  C h a r a c t e r i s t i c s
VBAT: Operating Conditions: T A =25℃, V IN =5V, unless otherwise specified.
VOUT: Operating Conditions: TA=25℃, unless otherwise specified.
Õ EFFI = [(Output Voltage × Output Current) / (Input Voltage × Input Current)] × 100%
SYMBOL PARAMETER CONDITIONS
MIN TYP MAX UNITS V IN  Input Supply Voltage
4.5
5.0    6 V V FLOAT
Regulated Output (Float) Voltage 0℃≤T A ≤85℃
4.16
4.2    4.24 V I BAT
BAT Pin Current
R SET = 10k, Current Mode  90  mA R SET  = 2k, Current Mode  450  mA I TRIKL  Trickle Charge Current R SET  = 2k
45  mA V TRIKL  Trickle Charge Threshold Voltage R SET  = 10k, V BAT  Rising      2.9  V I TERM
C/10 Termination Current Threshold R SET  = 2k
45
mA
V PROG  PROG Pin Voltage R SET  = 2k, Current Mode    1  V
∆V RECHRG  Recharge Battery Threshold Voltage
V FLOAT  - V RECHRG
250  mV
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOUT5 Output Voltage Range      4.85    5    5.15 V EFFI ＊
Efficiency
V IN =3.6V, I OUT =1A  90  % ΔV OUT  V OUT  Line Regulation V IN =3.2V~4.2V    3  mV ΔV LOADRE
G
Output Voltage Load Regulation
V IN =3.6V,1mA~1000mA
7
mV
INZOTEK
IT8327
T y p i c a l  P e r f o r m a n c e  C h a r a c t e r i s t i c s  (Step-up DC-DC Converter )
Operating Conditions: TA=25, ℃C1 = 10uF, C2= C3= 20uF, C4 = 0.1uF, Q1=2301，Q2=Q3=2302, L1=4.7uH, D1=SK52*2, R1=R2=R3=R4=R5=2k,unless otherwise specified.
VOUT Ripple                                      VOUT Ripple
（V IN =3.6V, V OUT =5V, I LOAD =1A ）                    （V IN =4.2V, V OUT =5V, I LOAD =1A ）
INZOTEK
IT8327
Operating Conditions: TA=25, ℃C1 = 10uF, C2= 20uF, C3= 20uF+100uF(Electrolytic Capacitor), C4 = 0.1uF, Q1=2301，Q2=HX3400, Q3=2302,  L1=4.7uH, D1=SK52*2, R1=R2=R3=R4=R5=2k,unless otherwise specified.
VOUT Ripple
（V IN =4.2V, V OUT =5V, I LOAD =1.8A ）
float upINZOTEK
IT8327

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