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參數資料
| 型號： | LTC4010CFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 615 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, LEAD FREE, EXPOSED PAD, PLASTIC, TSSOP-16 |
| 文件頁數： | 10/24頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LTC4010CFE#PBF |
18
LTC4010
4010fa
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Minimum 1 Amp LTC4010 Application
FAULT
CHRG
READY
VCC
TGATE
VCDIV
VCELL
CHEM
VTEMP
LTC4010
TIMER
INTVDD
GND
SENSE
BAT
FROM
ADAPTER
5.5V TO 34V
10
H
TO
SYSTEM
LOAD
0.1
NiCd
PACK
(1AHr)
4010 F06
3k
R
49.9k
10k
8.66k
0.1
F
10
F
R2
33nF
10
F
BGATE
PGND
Sample Applications
Figures 6 through 8 detail sample charger applications
of various complexities. Combined with the Typical
Application on the first page of this data sheet, these
figures demonstrate some of the proper configurations
of the LTC4010. MOSFET body diodes are shown in these
figures strictly for reference only.
Figure 6 shows a minimum application, which might be
encountered in low cost NiCd fast charge applications. The
LTC4010 uses –
V to terminate the fast charge state, as
no external temperature information is available.
Nonsynchronous PWM switching is employed to reduce
external component cost. A single LED indicates charging
status.
A full-featured 2A LTC4010 application is shown in Fig-
ure 7. The inherent voltage ratings of the VCELL, VCDIV,
SENSE and BAT pins allow charging of one to sixteen
series nickel cells in this application, governed only by the
VCC overhead limits previously discussed. The application
includes all average cell voltage and battery temperature
sensing circuitry required for the LTC4010 to utilize its full
range of charge qualification, safety monitoring and fast
charge termination features. The VTEMP thermister net-
work allows the LTC4010 to accurately terminate fast
charge under a variety of applied charge rates. Use of a
synchronous PWM topology improves efficiency and re-
duces excess heat generation. A green LED indicates valid
DC input voltage and installed battery, while a red LED
indicates charging. Fault conditions are indicated by a
yellow LED. The grounded CHEM pin selects the NiMH
charge termination parameter set.
P-channel MOSFET Q4 functions as a switch to connect
the battery to the system load whenever the DC input
adapter is removed. If the maximum battery voltage is less
than the maximum rated VGS of Q4, diode D1 and resistor
R1 are not required. Otherwise choose the Zener voltage
of D1 to be less than the maximum rated VGS of Q4. R1
provides a bias current of (VBAT – VZENER)/(R1 + 20k) for
D1 when the input adapter is removed. Choose R1 to make
this current, which is drawn from the battery, just large
enough to develop the desired VGS across D1.
While the LTC4010 is a complete, standalone solution,
Figure 8 shows that it can also be interfaced to a host
microprocessor. The host MCU can control the charger
directly with an open-drain I/O port connected to the
VTEMP pin, if that port is low leakage and can tolerate at
least 2V. The charger state is monitored on the three
LTC4010 status outputs. Charging of NiMH batteries is
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