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| 型号： | LTC4010CFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER NIMH/NICD 16-TSSOP |
| 标准包装： | 95 |
| 功能： | 充电管理 |
| 电池化学： | 镍镉（NiCd）、镍金属氢化物（NiMH） |
| 电源电压： | 4.5 V ~ 34 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
LTC4010
OPERATION
Status Outputs
(Refer to Figure 1)
PWM Current Source Controller
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
V CDIV pin as a function of LTC4010 operation. The status
outputs can directly drive current-limited LEDs terminated
to the DC input. The V CDIV column in Table 1 is strictly
informational. V CDIV should only be used to terminate the
V CELL resistor divider, as previously discussed.
Table 1. LTC4010 Status Pins
READY FAULT CHRG V CDIV CHARGER STATE
Off Off Off Off Off
On Off Off On Ready to Charge
(V TEMP Held Low)
or Automatic Recharge
On Off On On Precharge, Fast or Top Off
Charge (May be Paused)
On On On or Off On Temperature Limits
Exceeded
Off On Off On Fault State (Latched)
An integral part of the LTC4010 is the PWM current source
controller. The charger uses a synchronous step-down
architecture to produce high efficiency and limited thermal
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-
mount power FETs likely to appear in applications providing
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 R SENSE is averaged by integrating error amplifier
EA. An internal programming current is also pulled from
input resistor R1. The I PROG ? R1 product establishes the
desired average voltage drop across R SENSE , and hence,
V CC
LTC4010
14
TGATE
Q
S
R
PWM CLOCK
12
BGATE
9
SENSE
R3
R SENSE
10
BAT
R4
CC
R1
R2
EA
I TH
I PROG
4010 F02
Figure 2. LTC4010 PWM Control Loop
4010fb
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