SI9731DQ-T1 [VISHAY]
Power Management Circuit;
| 型号： | SI9731DQ-T1 |
| 厂家： | 
VISHAY |
| 描述： | Power Management Circuit |
| 文件： | 总9页 (文件大小：55K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Si9731
Vishay Siliconix
mP Controlled Battery Charger
For 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries
FEATURES
D Pulse Charges 1-Cell Li-ion or 1-Cell to 3-Cell
D Complete Isolation from Battery to External Power
NiCd/NiMH Batteries
Supply In Shutdown
D Integrated MOSFETs With Bi-directional Reverse
D Thermal Shutdown
Current Blocking in “OFF” Mode
D Minimum Number 0f External Components
D PWM Controlled Fast Charging Mode
D ESD Protection to 4 kV on Charger Input and Battery
D Low Current Trickle Charge Mode
D Pin Selectable 4.1 V or 4.2 V Charge Termination for
Li-ion
Output
D TSSOP-16 Package (1.2-mm maximum height)
D Constant Voltage (CV) Termination For Li-ion
D Input Over-Voltage Detector with Automatic Shutdown
D External Shutdown
APPLICATIONS
D Cellular Phone Battery Charger
D Personal Digital Assistants
D Under 1-mA Reverse Battery Leakage Current In
Shutdown
DESCRIPTION
Si9731 is a chemistry independent battery charger designed
to pulse charge 1-cell to 3-cell NiCd/NiMH or 1-cell Li-ion
batteries. Battery charging is accomplished under direct
control from the system processor. An internal low rDS(on)
MOSFET can be pulsed on and off at varying duty cycle by the
system processor to pulse charge the battery at high charge
current while minimizing heat dissipation. Provision is also
made to trickle charge a discharged battery until the battery is
charged to a high enough voltage to wake up the processor so
that the processor can take control of the charging process.
For charging Li-ion batteries, Si9731 includes a precision
voltage reference and an error amplifier for constant voltage
(CV) charge mode.
FUNCTIONAL BLOCK DIAGRAM
V
BAT
V
CHARGER
ON/OFF
Fast
Charge
B
a
t
Trickle
Charge
t
e
r
y
TRICKLECHARGEENABLE
CV
MODE
Charge Control
4.1/4.2 V_TAP
FAST CHARGE
GND
Document Number: 71321
S-02258—Rev. A, 28-Sep-00
www.vishay.com
1
Si9731
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND = 0 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65 to 150_C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
V
V
V
, V
, V
, V
, V
, V
, V
, V
,
,
CHARGER (CVMODE) (TRICKLECHARGEEN) (MAINCHARGEREN) (ON/OFF)
a
Power Dissipation (Package)
(4.1 V_TAP) (VBAT+) (CHARGERPOWER_ON) (CHARGERPRESENT)
(TRICKLE_VBAT)
b
16-Pin TSSOP (Q Suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 W
Thermal Impedance (Q )
JA
V
, V
. . . . . . . . . –0.3 V to +13.5 V
(CHARGERPRESENTIN) (CHARGERPOWER_ONIN)
16-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100_C/W
Maximum Input Current (I
) . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 A
CHARGER(max)
Notes
Maximum Sink Current
a. Device mounted with all leads soldered or welded to PC board.
CHARGERPOWER_ON and CHARGERPRESENT Pins . . . . . . . . . . . 5 mA
b. Derate 10 mW/_C above 25_C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Voltages Referenced to GND = 0 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 V to 12 V
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 mF
OUT
V
C
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 mF
CHARGER
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40_C to +85_C
See application drawing Figure 1.
V
REF
Bypass Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 mF
SPECIFICATIONS
Test Conditions Unless Specified
–40_C t T t +85_C
A
Symbol
Mina
Typb
Maxa Unit
Parameter
3.0 V v V
v 6.5 V, V
= 1.5 V
CHARGER
ON/OFF
External Charger Voltage
Under Voltage Lockout on Charger
UVLO Hysteresis
V
3.0
2.45
70
12
CHARGER
V
mV
V
UVLO
Rising Edge of Battery Charger
2.6
90
2.75
UVLO
110
HYST
–10_C t T t +40_C
4.050
4.025
4.150
4.125
4.70
4.1
4.150
4.150
4.250
4.250
5.15
A
Regulated Output Voltage 4.1 V_TAP to
V
= 5.0 V
= 1 mA
CHARGER
V
BAT
I
–40_C t T t +85_C
4.1
BAT+
A
V
MAINCHARGEREN
= 5.0 V
CVMODE = 5.0 V
TERM+
–10_C t T t +40_C
4.2
A
Regulated Output Voltage 4.1 V_TAP Open
–40_C t T t +85_C
4.2
A
Battery Over Voltage Protection
Battery Over Voltage Hysteresis
Battery Minimum Operating Voltage
V
Rising Edge of V
4.95
0.11
3.41
–0.04
0.04
OVP
BAT+
V
V
OVP_HYS
V
Rising Edge, V
Latch
3.32
–0.08
0.01
3.50
–0.01
0.08
BAT(min)
BAT+
Comparator
Offset Voltage,
MAINCHARGEEN— High
MAINCHARGEEN— Low
Charger Voltage to Battery Voltage
Comparator Offset
V
OS_CB
V
– V
CHARGER
BAT+
Charger Voltage to Battery Voltage
Comparator Hysteresis
0.07
1
I
I
IN(VCHARGER Pin)
ON-Mode
Quiescent Current (Normal Mode)
1 mA v I
v 600 mA
3
1
mA
BAT+
Quiescent Current
(Shutdown Mode)
IN(VCHARGER Pin)
OFF-Mode
V
= 0 V, V
= 4.5 V
0.1
mA
ON/OFF
CHARGER
R
Pin 12 to Pin 14
Pin 12 to GND
1
FB1
Feedback Resistor
kW
mA
R
+ R
41
FB2
FB3
V
= 0 V
–1
–1
0.1
0.1
1
2
ON/OFF
Battery Leakage Current
I
+ I
PIN14
V
BAT+
= 4.2 V
PIN13
V
=
CHARGER
0 V
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
2
Si9731
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Specified
–40_C t T t +85_C
A
Symbol
Mina
Typb
Maxa Unit
Parameter
3.0 V v V
v 6.5 V, V
= 1.5 V
CHARGER
ON/OFF
MAINCHARGEREN
Q1 ON Resistance
Q2 ON Resistance
Q1 r
400
10
mW
DS(on)
w 1.5 V
TRICKLECHARGEEN
V
= 4.5 V
CHARGER
Q2 r
Q5 r
6
DS(on)
v 0.4 V
W
c
Q5 ON Resistance
CVMODE w 1.5 V
6
DS(on)
Over Voltage Detect Threshold
V
V
12.2
12.8
13.4
CHARGER(OVD)
V
CHARGER(OVD)
_HYS
Over Voltage Detect Threshold Hysteresis
0.4
0.1
Output High
Leakage
I
V
= 6.5 V
2
mA
OH
OH
CHARGERPRESENT and
CHARGERPOWER_ON
Current
Output Low
Voltage
V
V
I
OL
= 1 mA
0.4
0.4
OL
Logic Low
Voltage
V
IL
V
CHARGERPRESENTIN,
CHARGERPOWER_ONIN,
TRICKLECHARGEEN,
MAINCHARGEEN or
CVMODE
Logic High
Voltage
1.5
1.5
IH
Pull Down
Current
I
0.7
10
mA
_C
P/D
c
Thermal Shutdown Temperature
T
130
10
S/D
c
Thermal Shutdown Hysteresis
T
HYST
V
ON/OFF(high)
Shutdown High Voltage Logic Level
Shutdown Low Voltage Logic Level
Shutdown Hysteresis
V
V
0.3
ON/OFF(low)
ON/OFF(hyst)
V
100
mV
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
b. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.
c. Guaranteed by design and characterization, not subject to production testing.
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
3
Si9731
Vishay Siliconix
PIN CONFIGURATION
TSSOP-16
CHARGERPRESENTIN
CHARGERPOWER_ONIN
CHARGERPRESENT = (XCHARGERPRESENT)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CHARGERPOWER_ON = (XCHARGERPOWER_ON)
V
V
BAT+
CHARGER
ON/OFF
TRICKLE_V
4.1 V_TAP
GND
BAT
Si9731DQ
TRICKLECHARGEEN
CVMODE
MAINCHARGEEN
(N/C)
(N/C)
V
REF
Top View
Ordering Information
Part Number
Temperature Range
Package
Si9731DQ
–40 to 85_C
Tape and Reel
Eval Kit
Temperature Range
Board Type
Si9731DB
–40 to 85_C
Surface Mount
PIN DESCRIPTION
Pin Number
Name
Function
1
2
3
4
5
CHARGERPRESENTIN
CHARGERPOWER_ONIN Logic input for CHARGERPOWER_ON output
External charger
Logic input for CHARGERPRESENT output
V
CHARGER
ON/OFF
Master shutdown pin. Taking ON/OFF low shuts down the charger and quiescent current drops to under 1 mA
TRICKLECHARGEEN
Taking this pin high disables trickle (slow) charging
A logic high enables the error amplifier to linearly drive the gate of MOSFET Q1 when MAINCHARGEREN is
high.
6
7
CVMODE
An external PWM signal at MAINCHARGEREN pin controls the ON/OFF duty cycle of the Fast Charge
MOSFET, Q1.
MAINCHARGEEN
N/C
8, 10
9
Do not connect external circuitry to this pin. Circuitry internal to the IC is connected to this pin.
Internal 1.30-V precision bandgap reference voltage. Do not apply loads to this pin.
Low impedance system ground
V
REF
11
GND
12
13
14
15
16
4.1 V_TAP
Connect this pin to V
for 4.1-V charge termination in constant voltage mode
BAT+
TRICKLE_V
Resistor connected between this pin and V
to limit the trickle charge current.
BAT
BAT
V
BAT+
Charger output connected to battery’s positive terminal
Open drain logic output
CHARGERPOWER_ON
CHARGERPRESENT
Open drain logic output
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
4
Si9731
Vishay Siliconix
TABLE 1: BATTERY CHARGING CONTROL LOGIC (NOMINAL VOLTAGE VALUES)
TRICKLE
CHARGEEN
MAIN
CHARGEEN
VCHARGER
CVMODE
ON/OFF Q1b
Q2
OFF
OFF
Mode
Not Charging
Not Present
X
X
X
X
X
X
X
X
OFF
OFF
Not Present
OK to Charge
Not Charging
a
Over Voltage
X
X
X
X
OFF
OFF
Not Charging
V
u12.8 V
CHARGER
X
X
X
LOW
HIGH
OFF
OFF
OFF
ON
Not Charging (Shutdown)
Trickle Charge
LOW
LOW
LOW
Not Charging
(Current pulse off during Constant
Current Charge)
HIGH
LOW
LOW
HIGH
OFF
OFF
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
HIGH
ON
ON
OFF
OFF
Constant Current Charge
(current pulse on)
Present
OK to Charge
a
Not Charging
LOW
HIGH
HIGH
HIGH
LOW
LOW
HIGH
HIGH
OFF
OFF
OFF
OFF
(Current pulse off during Constant
Current Charge with output limited
to 4.1 V/4.2 V or end of charge in
Li-Ion charging)
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
ON
ON
OFF
OFF
Constant Current Charge
(Output Limited to 4.1 V/4.2 V or
Constant Voltage Charge)
Notes
a. “OK to Charge” is a flag signal that is enabled by satisfying all the following conditions:
6. Battery voltage is below 5 V
7. Charger voltage is greater than 3 V but below 12.8 V
8. If MAINCHARGEEN = Logic Low, V
> V
+ 40 mV,
CHARGER
BAT
If MAINCHARGEEN = Logic High, V
9. ON/OFF pin is at logic high.
> V
– 40 mV
CHARGER
BAT
b. Q1 drive is determined by the error amplifier during constant voltage mode.
Q1 drive is a combination of Q1 drive (digital) and the output of the error amplifier using the analog adder. The combinations are:
TABLE 2
Q1 Drive (Digital) Output of Error Amplifier
Q1 Drive
LOW
LOW
HIGH
HIGH
LOW
Intermediate
LOW
LOW (fully off)
Intermediate (linear mode)
HIGH (fully on)
HIGH
Should Never Happen
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
5
Si9731
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
V
(CV Mode) vs. V
V
BAT
(CV Mode) vs. Temperature
BAT
CHARGER
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.06
4.1 TAP Open
4.1 TAP Open
4.1 TAP to V
BAT
4.1 TAP to V
BAT
3
6
9
12
–40
–15
10
35
60
85
V
(V)
Temperature (_C)
CHARGER
Charger UVLO Rising vs. Temperature
V
Leakage vs. Temperature
BAT
700
600
500
400
300
200
100
0
0.40
0.32
0.24
0.16
0.08
0.00
C
iss
V
GS
= 4.5 V
C
oss
V
GS
= 10 V
C
rss
0
3
6
9
12
15
0
6
12
18
24
30
Temperature (_C)
Temperature (_C)
Document Number: 71321
S-02258—Rev. A, 28-Sep-00
www.vishay.com
6
Si9731
Vishay Siliconix
BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT
16
CHARGERPRESENT
1
Q3
CHARGERPRESENTIN
15
CHARGERPOWER_ON
2
CHARGERPOWER_ONIN
Q4
Latch
4
ON/OFF
1 MW
100 kW
Battery Min Voltage
–
3.4 V
5 V
UVL
+
3
+
V
V
BAT+
V
BAT
CHARGER
Circuit
Power
14
2.6 V
–
+
C
IN
2.2 mfd
OVP
–
C
OUT
OK to Charge
(OTC)
–
2.2 mfd
B
Battery Over
Voltage
a
t
12.8 V
+
t
e
r
y
56 W
+
–
13
Q2
Trickle_V
BAT
Trickle
Charge
Q1
Fast
Charge
RFB1
12
4.1 V_TAP
RFB2
RFB3
5
6
7
TRICKLECHARGEEN
Digital
CVMODE
+
Q5
11
9
GND
Enable
MAINCHARGEEN
–
+
Temp
OK
Analog
V
REF
2.6 V
3.4 V
5 V
E/A
Temp
Sensor
Voltage
Generator
Ref
Voltage
0.1 mfd
1.3 V
12.8 V
8
10
N/C
N/C
FIGURE 1.
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
7
Si9731
Vishay Siliconix
DETAIL OPERATIONAL DESCRIPTION
Si9731 is a chemistry independent battery charger designed
for use with a system processor. For example, Si9731 can be
integrated within a cellular phone whereby the fast charge and
trickle (slow) charge modes can be software controlled by the
DSP. The device is designed to charge 1-cell Li-ion or 1-cell to
3-cell NiCd/NiMH batteries. A regulated or unregulated
external dc power source such as a wall adapter rated at
typically 4.5 V to 12 V is connected to Si9731’s VCHARGER
input pin. Note that a typical low cost wall adaptor is comprised
of a transformer, bridge rectifier and a reservoir capacitor. The
wall adaptor’s output voltage decreases linearly with increase
in output current. When Si9731 is fast charging the battery, the
wall adaptor’s output voltage tracks the battery voltage plus
the voltage drop across Q1 (charging current times MOSFET
Q1’s rDS(on), see Figure 1). The key features of Si9731 are
described below.
Fast Charge
Fast charging is accomplished by the low “ON” resistance
MOSFET, Q1. The application microprocessor is able to
“Pulse Charge” the battery via the MAINCHARGEREN control
input of Si9731. The processor monitors the battery voltage
via the system A/D converter and varies the pulse charging
duty cycle accordingly to maintain fast charging. Note that
even though charging current may be sufficiently high, pulse
charging with short “ON” time and long “OFF” time ensures that
heat generation due to thermal heating is reduced.
In the case of NiCd or NiMH batteries, one of several charge
termination schemes may be used to terminate charge. For
example, the processor may disable fast charging by sensing
DV or dV/dt at the VBAT+ output or by monitoring the
temperature differential DT of the battery. Following fast
charge, trickle charge may be enabled to “top off” the battery.
Since the under voltage lock out (UVLO) point of Si9731 is
2.6 V (typical) , it is essential to keep the charger voltage above
this level under all conditions, especially for fast charging of
single cell NiCd/NiMH. One simple solution is adding a
external resistor between VBAT+ pin and the battery, which
creates extra voltage drop to elevate the charger voltage. The
value of the resistor is affected by the output V-I characteristic
of the ac charger.
When charging a 1-cell Li-ion battery, fast charging will operate
in two modes, constant current mode followed by constant
voltage mode. In the constant current mode, a discharged
Li-ion battery is charged with constant current available from
the external dc source. The MOSFET pass transistor (Q1) may
be pulsed “ON” and “OFF” at varying duty cycle by the control
signal present at the MAINCHARGEEN input pin. Once the
battery voltage reaches it’s termination voltage of 4.1 V or
4.2 V (depending on the connection of the 4.1-VTAP), Si9731
may be placed in the “Constant Voltage” charging mode by
taking the CVMODE pin high . Taking CVMODE pin high
disables trickle charging and enables the internal battery
voltage divider by turning ON Q5. Then the error amplifier will
compare divided VBAT+ voltage against an internal precision
1.3-V bandgap reference voltage (see Figure 1). The output of
the error amplifier drives the pass transistor Q1 to maintain
VBAT+ at the regulated termination voltage. This operation is
same as a linear regulator.
Trickle Charge
The charge path is via n-channel MOSFETs Q1 or Q2 (see
applications circuit of Figure 1). Si9731 defaults to trickle (slow)
charge mode if the battery voltage is too low to power the main
processor. With the main processor unable to drive the
MAINCHARGEEN pin as well as the TRICKLECHARGEEN
pins, Q1 is turned “OFF” preventing fast charging. Meanwhile
n-channel MOSFET Q2 turns “ON” and establishes a trickle
charge path from the external power source VCHARGER to the
battery. The trickle charge current is set by an external current
True Load Disconnect
limiting resistor, Rext, and is approximately ITRICKLE
=
(VCHARGER - VBAT+)/Rext. Once the battery voltage charges
up to minimum battery operating voltage 3.4 V, the internal
latch is triggered and the CHARGERPOWER_ON output
changes state to wake up the processor. The processor is now
able to disable trickle charge mode by taking the
TRICKLECHARGEEN pin high while taking control of fast
charging via the MAINCHARGEEN pin.
Both the fast charge FET (Q1 in Figure 1) and trickle charge
FET (Q2 in Figure 1) incorporate a floating body diode. In their
“OFF” state both FETs block current bidirectionally. Note that
because of the reverse blocking switches, a Schottky diode in
series with the external VCHARGER power supply is not
required.
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
8
Si9731
Vishay Siliconix
DETAIL OPERATIONAL DESCRIPTION
4.1 VTAP
over voltage detector will turn off MOSFETs Q1, Q2,and Q5
and disable charging.
The Si9731’s internal feedback resistors are set to provide
4.2-V charge termination at VBAT+ output if the 4.1 VTAP is left
open circuit. Connecting the 4.1 VTAP to VBAT+ configures
Si9731 for 4.1-V charge termination at VBAT+. This feature
allows Si9731 to accommodate Li-ion batteries requiring 4.1-V
or 4.2-V charge termination. Caution : the 4.1 VTAP should not
be connected to ground or any other voltage source as this will
cause the Si9731 to operate open loop and can result in over
charging the battery!
Thermal Shutdown
Si9731 also includes a thermal protection circuit that suspends
charging through Q1 and Q2 when die temperature exceeds
130_C due to overheating. Once the die temperature cools to
below 120_C, the charging will resume.
Shutdown
Si9731 can be completely turned off by applying 0.4 V or less
to the device’s ON/OFF pin. In shutdown mode, Si9731 draws
less than 1-mA quiescent current with charger voltage below
UVLO, and draws 500 mA when charger voltage is above
UVLO. The device is enabled by applying 1.5 V to 12 V at the
ON/OFF pin. In applications where the device will always
remain enabled, the ON/OFF pin may be connected to the
VCHARGER pin. Si9731’s shutdown circuitry includes
hysteresis, as such the device will operate properly even if a
slow moving signal is applied to the ON/OFF pin. When the
device is enabled, the battery voltage sense circuitry draws
Feedback Disconnect Switch
The Si9731 includes a feedback disconnect switch (Q5 in
Figure 1) connected in series with the device’s internal
feedback resistor string. The 42-kW feedback resistor string is
connected to ground when both the internal “OK to Charge”
signal and the CVMODE pin are at logic high, providing
feedback voltage to Si9731’s error amplifier. This action helps
prevent the Si9731 from discharging the battery.
approximately 25 mA from VBAT
.
CHARGERPRESENT and CHARGERPOWERON
OK to Charge (OTC)
CHARGERPRESENT and CHARGERPOWERON are open
drain outputs, each requiring an external pull-up resistor.
Si9731 also includes an internal signal that enables both trickle
charge mode and fast charge mode operations, the “OK to
Charge” (or OTC) signal. The OTC signal is at logic high if all of
the following are satisfied:
CHARGERPRESENT
pin
goes
low
with
CHARGERPRESENTIN pin goes high, signaling the processor
that a charger has been inserted. CHARGERPOWERON Pin
goes low when CHARGERPOWERONIN Pin is high, charger
voltage is not in UVLO and the battery voltage has increased to
above 3.4 V, turning on the system power supply since the battery
has been charged up to minimum operating voltage.
1. Battery voltage is below 5 V
2. Charger voltage is greater than 2.6 V but below 12.8 V
3. VCHARGER u VBAT + 40 mV when MAINCHARGEEN =
Low
VCHARGER u VBAT – 40 mV when MAINCHARGEEN =
Input Over-Voltage Detector
High
4. ON/OFF pin is at logic high.
The external dc source connected to the VCHARGER pin should
be at 12 V or less. In the unlikely event that the voltage at
VCHARGER pin is at or above 12.8 V (typical), Si9731’s internal
In order to charge the battery in any manner, the OTC signal
has to be high.
Document Number: 71321
www.vishay.com
S-02258—Rev. A, 28-Sep-00
9
相关型号：
SI9731_09
uP Controlled Battery Charger for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries
VISHAY
SI9802DY-T1
Small Signal Field-Effect Transistor, 4.5A I(D), 20V, 2-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, SO-8
VISHAY
SI9802DY-T1-E3
Small Signal Field-Effect Transistor, 4.5A I(D), 20V, 2-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, LEAD FREE, SOP-8
VISHAY
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