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參數(shù)資料
| 型號(hào)： | LTC4010EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 281K |
| 代理商： | LTC4010EFE |
LTC4010
4010fb
Figure 2. LTC4010 PWM Control Loop
10
–
+
CC
EA
ITH
IPROG
R3
Q
PWM CLOCK
S
R
R4
R1
BAT
9
SENSE
RSENSE
12
BGATE
14
TGATE
LTC4010
VCC
R2
4010 F02
operaTion (Refer to Figure 1)
Status Outputs
The LTC4010 open-drain status outputs provide valuable
information about the IC’s operating state and can be
used for a variety of purposes in applications. Table 1
summarizes the state of the three status outputs and the
VCDIV pin as a function of LTC4010 operation. The status
outputscandirectlydrivecurrent-limitedLEDsterminated
to the DC input. The VCDIV column in Table 1 is strictly
informational. VCDIV should only be used to terminate the
VCELL resistor divider, as previously discussed.
Table 1. LTC4010 Status Pins
READY
FAULT
CHRG
VCDIV
CHARGER STATE
Off
On
Off
On
Ready to Charge
(VTEMP Held Low)
or Automatic Recharge
On
Off
On
Precharge, Fast or Top Off
Charge (May be Paused)
On
On or Off
On
Temperature Limits
Exceeded
Off
On
Off
On
Fault State (Latched)
PWM Current Source Controller
An integral part of the LTC4010 is the PWM current source
controller. The charger uses a synchronous step-down
architecturetoproducehighefficiencyandlimitedthermal
dissipation. The nominal operating frequency of 550kHz
allows use of a smaller external inductor. The TGATE and
BGATE outputs have internally clamped voltage swings.
They source peak currents tailored to smaller surface-
mountpowerFETslikelytoappearinapplicationsproviding
an average charge current of 3A or less. During the various
charging states, the LTC4010 uses the PWM controller to
regulate an average voltage between SENSE and BAT that
ranges from 10mV to 100mV.
A conceptual diagram of the LTC4010 PWM control loop
is shown in Figure 2.
The voltage across the external current programming
resistor RSENSE is averaged by integrating error amplifier
EA. An internal programming current is also pulled from
input resistor R1. The IPROG R1 product establishes the
desired average voltage drop across RSENSE, and hence,
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