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参数资料
| 型号： | LTC4001EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION BUCK 16-QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
LTC4001
TYPICAL PERFOR A CE CHARACTERISTICS
INPUT
CURRENT (I IN )
0.5A/DIV
Soft-Start (PWM Mode)
400
350
300
IDET Threshold vs R IDET for
R PROG = 549 ?
CHRG Pin Temperature Fault
Behavior (Detail)
INDUCTOR
CURRENT (I L )
0.5A/DIV
SOFT-START
0
0
250
200
CHRG
1V/DIV
VOLTAGE (V SS )
1V/DIV 0
150
EN PIN (V EN )
5V/DIV 0
V BAT = 3.5V
V IN = 5V
2ms/DIV
4001 G09
100
50
TIME (20 μ s/DIV)
4001 G11
0
300 400 500 600 700 800 900 1000 1100 1200
R IDET ( ? )
4001 G10
PI FU CTIO S
BAT (Pin 1): Battery Charger Output Terminal. Connect a
10 μ F ceramic chip capacitor between BAT and PGND to
keep the ripple voltage small.
SENSE (Pin 2): Internal Sense Resistor. Connect to exter-
nal inductor.
PGND (Pin 3): Power Ground.
GNDSENS (Pin 4): Ground Sense. Connect this pin to the
negative battery terminal. GNDSENS provides a Kelvin
connection for PGND and must be connected to PGND
schematically.
SW (Pin 5): Switch Node Connection. This pin connects to
the drains of the internal main and synchronous power
MOSFET switches. Connect to external inductor.
EN (Pin 6): Enable Input Pin. Pulling the EN pin high places
the LTC4001 into a low power state where the BAT drain
current drops to less than 3 μ A and the supply current is
reduced to less than 50 μ A. For normal operation, pull the
pin low.
CHRG (Pin 7): Open-Drain Charge Status Output. When
the battery is being charged, CHRG is pulled low by an
internal N-channel MOSFET. When the charge current
drops below the IDET threshold (set by the R IDET program-
ming resistor) for more than 5milliseconds, the N-channel
MOSFET turns off and a 30 μ A current source is connected
from CHRG to ground. (This signal is latched and is reset
by initiating a new charge cycle.) When the timer runs out
or the input supply is removed, the current source will be
disconnected and the CHRG pin is forced to a high imped-
ance state. A temperature fault causes this pin to blink.
PV IN (Pin 8): Positive Supply Voltage Input. This pin
connects to the power devices inside the chip. V IN ranges
from 4V to 5.5V for normal operation. Operation down to
the undervoltage lockout threshold is allowed with current
limited wall adapters. Decouple with a 10 μ F or larger
surface mounted ceramic capacitor.
V INSENSE (Pin 9): Positive Supply Sense Input. This pin
connects to the inputs of all input comparators (UVL, V IN
to V BAT ). It also supplies power to the controller portion of
this chip. When the BATSENS pin rises to within 30mV of
V INSENSE , the LTC4001 enters sleep mode, dropping I IN to
50 μ A. Tie this pin directly to the terminal of the PV IN
decoupling capacitor.
4001f
5
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