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參數(shù)資料
| 型號： | LM3655TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封裝： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 833K |
| 代理商： | LM3655TLX |
7.0 LM3655 Pin Description (Continued)
Pin #
Name
I/O
Type
Description
E2
BATT_DETB
Input
Logic
This pin is used to detect the presence of a battery. When the battery
is missing, the internal 100K resistor will pull up this pin to the voltage
on CELL. When the battery is present, this pin should be pulled low.
E3
CHRG_STATE
Output
Open
Drain
This pin is used to indicate the charge status. An external 30K pull-up
resistor needs to be connected between this pin and RADIO+ if output
on this pin is desired. A low output signifies that the IC is charging the
battery cell in full-rate mode. A high output indicates that trickle/top-off
charging is in process. The output is also high when the charger is
disabled (DIS pin tied high).
E4
CHRG_DETB
Output
Open
Drain
An external 30K pull-up resistor needs to be connected between this
pin and RADIO+ if output on this pin is desired. The CHRG_DETB
indicates whether an external power supply has been detected (output
= low) or not (output = high).
E5
VDET
Input
Analog
VDET provides the internal control with a signal that is proportional to
the external voltage level and also provides power to the internal
control circuitry.
8.0 Ordering Information
Order Number
Packaging Type
NSC Package
Marking (*)
Supplied As
LM3655TL
25-bump Wafer Level
Chip Scale
(micro SMD)
XY TT S50
250 units, Tape-and-Reel
LM3655TLX
XY TT S50
3000 units, Tape-and-Reel
(*) XY - denotes the date code marking (2 digits) in production
(*) TT - refers to die/lot tracking for production
(*) S - product line designator
Package markings may change over the course of production
9.0 Operation Description
Refer to Typical Application Circuit for external and internal component reference designators such as Q1, M5, etc.
10.0 Pin Functions
10.1 V
IN
V
IN is the input pin for the charging current from the external power source to the battery/cell. When the phone is operating from
an external supply, cell phone operating current also passes through this pin. Total input current into the V
IN pin is internally
sensed by monitoring the voltage drop across the series sensing FET M5.
V
IN is derived from the output (collector) of Q1, and not directly connected to the external source. If the external power supply
(VPS) potential exceeds a maximum safe limit, Q1 will be controlled to protect the cell and phone circuits from over-voltage. Q1
provides the primary over-voltage protection mechanism for the phone circuits and the cell.
10.2 CELL
CELL is connected directly to the battery/cell positive terminal. Under normal operation of the phone, it serves as the main power
supply pin for the LM3655.
When the phone is drawing current from the battery, current will flow into this pin and out through the internal FET M4 to supply
the phone’s operating rail (RADIO_B+). When connected to an external supply to charge the battery, current will flow through M5
and out of this pin into the cell. If the phone is being operated while connected to an external power supply, the phone’s operating
current (current out of the RADIO_B+ pin) will be the sum of the currents into the CELL and V
IN pins.
10.3 RADIO_B+
All power for the phone’s operation (other than battery charging) is derived from this pin. The phone’s operating current flows
through M4, which is controlled and monitored to prevent overload or short-circuit currents, and disabled during cell under-voltage
conditions.
LM3655
www.national.com
4
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