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參數資料
| 型號： | SAA1504T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | Safety IC(安全保護芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, MS-012, SOT-96-1, SOP-8 |
| 文件頁數： | 4/16頁 |
| 文件大小： | 80K |
| 代理商： | SAA1504T |
2000 Mar 07
4
Philips Semiconductors
Objective specification
Safety IC
SAA1504T
PINNING
FUNCTIONAL DESCRIPTION
The basic function of the SAA1504T is to protect a single
Li-ion cell against overcharge and overdischarge for
reasons of life time and safety. The voltage across the cell
terminals (V
bat
) is monitored continuously and compared
to an accurate internal reference voltage.
The circuit diagram (see Fig.3) of a Li-ion battery pack
shows the SAA1504T and 2 power NMOS transistors
which are connected in anti series. Both transistors must
have their backgate connected to their source, resulting in
2 backgate diodes in anti series.
The timing diagram (see Fig.6) shows the detection levels
for the various modes of operation.
Battery voltage between 2.6 and 4.18 V
The safety IC is in the normal operating mode for
V
bat
= 2.6 to 4.18 V, a charge or discharge current below
the current-protection level and a junction temperature
below the temperature protection activation level. In this
mode transistors SW1 and SW2 are driven with an
elevated supply voltage (with a charge pump) which
guarantees a low on-resistance in the main current path.
This is important for fully utilizing the high energy density
of the Li-ion battery technology.
SYMBOL PIN
DESCRIPTION
V
SS
DO
CO
VM
ST
n.c.
CEXT
V
CC
1
2
3
4
5
6
7
8
ground supply
output to gate of discharge power FET
output to gate of charge power FET
negative sense input
status output
not connected
connection for external delay capacitor
positive battery sense input
handbook, halfpage
1
2
3
4
8
7
6
5
MGS970
SAA1504T
VCC
CEXT
DO
n.c.
ST
VM
CO
VSS
Fig.2 Pin configuration.
handbook, full pagewidth
MGS971
C1
0.47
μ
F
C2
SW2
2
ST
5
3
1
7
SW1
DO
CEXT
VSS
CO
VM
4
8
SAA1504T
Vbat
R1
1 k
+
charger/load
charger/load
VCC
Fig.3 Safety IC connection diagram.
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