PT8A2704PE [PERICOM]
Consumer Circuit, CMOS, PDIP8, MS-001BA, DIP-8;
| 型号： | PT8A2704PE |
| 厂家： | 
PERICOM SEMICONDUCTOR CORPORATION |
| 描述： | Consumer Circuit, CMOS, PDIP8, MS-001BA, DIP-8 光电二极管 |
| 文件： | 总7页 (文件大小：315K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT8A2704/04A
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Simple Fast Charger Controller
Product Features
Product Description
Fast charge of nickel cadmium (NiCd) or nickel-
metal hydride (NiMH) batteries
The PT8A2704/04A Fast-Charger IC is low-cost CMOS
battery-charge controller providing reliable charge
termination for both NiCd and NiMH battery
applications, such as Power tool and Consumer
electronics. A current-limited or constant–current supply
allows the PT8A2704/04A to be a cost-effective charger
Fast-charge termination by negative delta voltage,
maximum voltage, maximum temperature, and 90
minutes charging time
Support 1 to 8 cells fast charging
10% (PT8A2704) or 4% (PT8A2704A) of constant
charging current for trickle charging
On-chip 2.0V regulator
with only
a
few external components. The
PT8A2704/04A has programmable charging time and
programmable trickle charging rate control by options in
a single IC for charging NiCd or NiMH battery cells.
On chip precise ADC
Internal RC oscillator with external R&C
components
For safety, fast or trickle charging is inhibited if the
battery temperature is over a safety threshold. Fast
charge is terminated by any of the following:
- Negative delta voltage/zero delta voltage
- Maximum voltage
Low cost 8-pin DIP/SOIC package
Applications
Rechargeable shavers and hair cutters
- Maximum temperature
Rechargeable RC cars
- Maximum time
Rechargeable power tools
Pin Assignment and Pin Description
Pin Description
PT8A2704/04A
DIP-8 or SOIC-8
Package (Top View)
Pin
No.
1
2
3
Pin
Name
GND
VB
VT
I/O
Description
Power ground
Battery voltage input (1.6V – 1.8V)
NTC voltage input(1.6V – 1.8V)
RC oscillator input, external resistor
pull-up and capacitor pull-down
Cord detection input
Positive power supply voltage
Charging control enable
2.0v regulated voltage
-
I
I
4
OSC
I
5
6
7
8
CORD
VCC
CHARGE
VEE
I
-
O
O
12-07-0005
PT0199-8
07/05/12
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PT8A2704/04A
Simple Fast Charger Controller
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Block Diagram
Functional Description
Voltage Regulator (2.0V Regulator): Build-in voltage regulator used to power supply RC oscillator, precise ADC.
Oscillator: Internal RC oscillator to generate a 64 kHz clock for internal system.
POR (Power-on Reset): Power on reset to reset all internal logic while power on.
Charging Control: Charging control enables output CHARGE pin which can be used to show charging status. It is logic high
during constant current charging and 12.5Hz with 10% (for PT8A2704) or 4% (for PT8A2704A) duty cycle during trickle current
charging
AC Cord Control: CORD input is external cord detection pin (digital level), active high.
Precision ADC:
VB measures the battery voltage. VB is a divide voltage from the battery voltage. When VB exceeds the maximum voltage
(0.9VEE), fast charging will be terminated. Moreover, VB detects the negative delta voltage during fast charging. It is suggested
to set the termination voltage of VB within the input range of the ADC which is 0.8VEE to 0.9VEE.
VT measures the temperature of the battery with an external NTC (refer to How to determine RX1 on page5). Maximum
temperature termination occurs when the VT exceeds a temperature cut-off threshold voltage (eg. 50˚C which equivalent to
0.887VEE). Constant current or trickle charging will stop completely when the temperature exceeds another threshold voltage (eg.
55˚C which equivalent to 0.897VEE).
Charging Cycle Phases
No charging
Stop charging
Fast charging
Pulse-trickle
CORD
CHARGE
Fast charge is started when the CORD is high. If the battery voltage is over the limit or temperature exceeds 50˚C, pulse-trickle
charge begins and the device charges the battery with trickle charge till the CORD is low (see above Figure).
Fast charge will be termination by one or more of the four possible termination conditions:
negative delta voltage/delta voltage
maximum voltage
maximum temperature
maximum time
12-07-0005
PT0199-8
07/05/12
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PT8A2704/04A
Simple Fast Charger Controller
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Maximum Ratings
Note:
o
o
StorageTemperature…………………………………………... -25 Cto+85 C
SupplyVoltagetoGroundPotential(VCC)…………. ……………...…-0.5Vto 6V
DCInputVoltage…………………………………..……… -0.5VtoVCC+0.5V
DC Output Current……………………………………………....20mA
Power Dissipation…………………………………………...…500mW
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operation Condition
Parameters
VCC
Description
Min.
2.2
0.8
Type.
2.4
-
Max.
5.5
0.9
Unit
V
VEE
Operating Voltage
ADC VIN
Input voltage range (VT, VB)
Fosc
TA
Frequency of oscillator (C=390pF, R=47kΩohm)
54.4
0
64
25
73.6
70
kHz
Operation Temperature
˚C
DC Electrical Characteristics
(TA= 0~70°C, VCC= 2.4V unless otherwise claims)
Symbol Description
Test Conditions
Min.
Typ.
Max.
Unit
Input Low/HIGH leakage current for
CORD pin
IIL, IIH
VCC=2.4V,VIL=0.2V, VIH=2.2V
-1
-
1
μA
IOH
IOL
Output HIGH current
Output LOW current
CHARGE pin, VOH=2.2V
CHARGE pin, VOL=0.2V
No load
-3
3
1.9
-
-
-
2.0
-
-
1
2.1
50
mA
VEE Regulator output voltage
V
Line Regulation of regulator
Load regulation
mV
mV
VO
2.2VVCC3.0V, No load
-
-
50
VLDR
0mA IL3mA
Maximum battery voltage to stop fast-
charge
VBmax
-
-
0.9
-
VEE
Maximum VT voltage for battery
VTmax temperature detection to stop fast- -
charge
-
0.897
-
VEE
Rslt
Average A/D resolution of ADC
No load
6.00
6.25
6.50
mV
LSB
LSB
μA
DNL ADC Differential nonlinearity
No load
-
-
-
1
1
-
-
-
INL
ICC
ADC Integral nonlinearity
Supply Current
No load
R=47kΩ, C=390pF, no load
380
AC Electrical Characteristics
(TA= 0~70°C, VCC= 2.2V~3.0V)
Symbol Description
Test Conditions
Min.
Typ.
Max.
Unit
FOSC
Oscillator Frequency
C=390pF, R=47kΩ
54.4
64
73.6
kHz
TFC
Maximum fast-charge time
OSC=64kHz
-
90
10
4
-
13
5
Minutes
PT8A2704
7
3
%
%
Duty-cycle of charge pin output in
trickle charge mode
DC
PT8A2704A
12-07-0005
PT0199-8
07/05/12
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PT8A2704/04A
Simple Fast Charger Controller
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Typical Application Circuit
1. Application circuit for larger discharging current.
PT8A2704/04A Application Circuit for Shaver with Two Batteries
Note:
a. R1 value can be adjusted to make sure the CORD voltage is around 2.0V.
b. As the device is always powered by battery, the static consumption must be considered in application design.
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PT8A2704/04A
Simple Fast Charger Controller
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2. Application circuit for smaller discharging current.
If discharging current is smaller, suggest using the following schematic:
PT8A2704/04A Application Circuit for Shaver with Two Batteries
PCB Layout Constraint
1. Cross angle between two Tracks should be larger than 90 degree.
2. Track should be short and wide enough to reduce voltage drop, especially Power supply and Ground as well as some tracks
flowing with large current, such as switch Q1.
3. A ceramic cap C6 about 103 need to add between VT and Ground of PT8A2704 in order to prevent detection circuit from noise.
4. A ceramic cap C7 about 103 and C8 10μF Tan cap need to add between VB to Ground.
VEE
How to determine RX1
Assuming Resistance of NTC at 55˚C is RT.
See right figure, below formula can be attained.
VT=RX1*VEE/ (RX1+RT) =1.8V
NTC
VEE=2.0V, finally
RX1=9*RT
VT
RX1
12-07-0005
PT0199-8
07/05/12
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PT8A2704/04A
Simple Fast Charger Controller
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Mechanical Information
8-Pin DIP
Dimensions In Millimeters
Symbol
Min
3.710
0.510
3.200
0.380
Max
4.310
A
A1
A2
B
3.600
0.570
B1
c
D
1.524 BSC
0.204
9.000
6.200
7.320
0.360
9.400
6.600
7.920
E
E1
e
L
E2
2.540 BSC
3.000
8.400
3.600
9.000
Note:
1) Controlling dimensions in millimeters.
2) Ref: JEDEC MS-001D/BA
12-07-0005
PT0199-8
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PT8A2704/04A
Simple Fast Charger Controller
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WE (8-Pin SOIC)
Dimensions In Millimeters
Symbol
Min
1.350
0.100
1.350
0.330
0.170
Max
1.750
0.250
1.550
0.510
0.250
A
A1
A2
b
c
D
E
E1
e
L
θ
4.700
3.800
5.800
5.100
4.000
6.200
Note:
1) Controlling dimensions in millimeters.
2) Ref: JEDEC MS-012E/AA
1.27 BSC
0.400
0°
1.270
8°
Ordering Information
Part Number
Package Code
Package
PT8A2704PE
PT8A2704WE
PT8A2704APE*
PT8A2704AWE*
P
W
P
Lead free 8-Pin DIP
Lead free and Green 8-Pin SOIC
Lead free 8-Pin DIP
W
Lead free and Green 8-Pin SOIC
Notes:
E = Pb-free or Pb-free and Green
Adding X Suffix= Tape/Reel
*Contact Pericom for availability.
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply
the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
12-07-0005
PT0199-8
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