SC803IMLTRT [SEMTECH]
Fully Integrated High Current Lithium-Ion Battery Charger System; 完全集成的大电流锂离子电池充电器系统
| 型号： | SC803IMLTRT |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fully Integrated High Current Lithium-Ion Battery Charger System |
| 文件： | 总17页 (文件大小：736K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC803
Fully Integrated High Current
Lithium-Ion Battery Charger System
POWER MANAGEMENT
Description
Features
Fully integrated charger with FET pass transistor,
reverse-blocking diode, sense resistor and thermal
protection
Complete voltage ranges of 4.1V, 4.2V &
adjustable
The SC803 is a fully integrated, single cell, constant-cur-
rent constant-voltage Lithium-Ion battery charger man-
agement system. The SC803 has built in intelligence and
extreme functionality. When the battery voltage is below
2.8V the charger operates in a pre-charge mode with a
charging current of up to 125mA based on the ITERM
pin resistor. This pre-charge mode is set to limit power
dissipation due to an undercharged battery. When the
battery voltage exceeds 2.8V, the charger enters a fast
charge mode. In this mode, the SC803 delivers up to
1.5A to the battery based on the IPRGM pin resistor.
Programmable precharge, fastcharge & termination
current
Battery voltage controlled to 1% accuracy
Soft-start for step load and adaptor plug-in
Up to 1.5A continuous charge current
Charge current monitor output from microcontroller
or ADC Interface
The part also features current termination, ending the
charge cycle when the battery is charged and the charge
current drops below the current programmed by the
ITERM pin resistor. In addition, the charge current can
be monitored by the voltage on the IPRGM pin allowing a
microcontroller or ADC to access the current informa-
tion to determine when to externally terminate the charge
cycle. Once the charge cycle is complete and terminates,
the device enters the charge monitor mode where the
output voltage of the battery is monitored. If this voltage
drops below the recharge threshold the device will enter
the fast charge mode again, to bring the battery to its
fully charged state. Both the shutdown and monitor
modes drain no more than 1uA from the battery guaran-
teed.
Input voltages range from 4.2V to 7V
0.1µA Battery drain current in shutdown and
monitor modes
Operates without a battery in regulated LDO mode
Small 4mm x 4mm 16 lead MLP package
Low thermal impedance of 50°C/watt
Few external components
Over current protection in all charging modes
Over voltage protection with fault pin output
All outputs able to drive LED’s and interface to host
processor
Remote Kelvin sensing at the battery terminal
Small input & output filter capacitors
Status output communicates charging and end of
charge cycle
The output voltage to the battery is controlled to within
1% of the programmed voltage for either 4.1V or 4.2V.
The SC803 can also function as a general purpose cur-
rent source or as a current source for charging nickel-
cadmium (NiCd) and nickel-metal-hydride (NiMH) batter-
ies using external termination.
Applications
Cellular phones
PDA’s
Handheld meters
Charging stations
Handheld computers
Digital cameras
Programmable current source
Typical Application Circuit
14
11
CHARGER VIN
VCC
VCC
IPRGM
EN
CP
10
13
3
STAT
9
OVP
2
7
VPRGM
4
1
ITERM
BIP
BSEN
VOUT
VOUT
NC
8
16
15
12
6
GND
5
CHARGER
PRESENT
NC
FAULT
STATUS
C1
R1
R2
SC803
1uF
C2
BATTERY
2.2uF
1.5
R2
1.5
R1
2.8
TerminationCurrent =
• 88
Fast −ChargeCurrent =
•1000
Pre−ChargeCurrent=
• 88
R2
Revision 4, November 2004
1
www.semtech.com
SC803
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
-0.3 to 7.0
-0.3 to +6.0
2.5
Units
V
VCC, EN to GND
VOUT, VPRGM, IPRGM, CP, OVP, STAT, ITERM, BIP to GND
V
Power Dissipation
MLP (Derate 20mW/ °C above 85 °C)
PD
W
VOUT short to GND
Continuous
Thermal Resistance, Junction to Ambient
Operating Junction Temperature
48
150
°C/W *
°C
θJA
TJ
IR Reflow Temperature
(Soldering) 10 seconds
TR option
TIRRT
TIRRT
TSTG
ESD
240
°C
TRT option (lead-free leadframe)
260
°C
Storage Temperature
-65 to 150
2
°C
ESD Rating (Human Body Model)
kV
* Tied to PCB with 1 Square Inch, 2 Ounce Copper
Electrical Characteristics
Unless otherwise noted: VCC = 4.75V - 5.25V
Parameter
Symbol
Conditions
25°C
Typ
TA
Units
(-40
°
C to +85 C)
°
Min
Max
Min
4.2
4.2
Max
7
Input Voltage
VCC
VOP
ICC
V
V
Operating Voltage
Operating Current
6.5
2
Charging Mode
OVP, STATUS, CP = 0µA
mA
LDO Mode
25
1
OVP, STATUS, CP = 0µA
Battery Leakage Current
Regulated Voltage
IVOUT
VBAT
VCC = 0V
0.1
µA
V
VPRGM = Logic High
VPRGM = Logic Low
4.20
4.10
4.16
4.06
4.24
4.14
Adjust Mode Feedback
Voltage
VPRGM = External Divider
VCC = 4.2V - 6.5V
3.0
82
45
2.97
3.03
V
Battery Pre-Charge Current
Battery Termination Current
Battery Fast-Charge Current
PCI
ITERM
FCI
72
92
ITERM Resistor = 3.01kΩ
VBATTERY > 2.5V
mA
mA
38
52
I
= 3.01kΩ
500
800
450
750
550
850
IPPRRGGMM = 1.87kΩ
VBATTERY = 3.8V
Dropout Voltage = 550mV
2004 Semtech Corp.
2
www.semtech.com
SC803
POWER MANAGEMENT
Electrical Characteristics Cont.
Unless otherwise noted: VCC = 4.75V - 5.25V
Parameter
Symbol
Conditions
25°C
TA
Units
(-40°C to
+85°C)
Min Typ Max Min
Max
Battery Fast-Charge
Current Limit
2.8V < VBATTERY < VBAT
Dropout voltage = 1V
1.5**
A
IPROG Regulated Voltage
1.5
4.2
90
1.4
1.6
4.3
V
V
VIN UVLO Rising Threshold
Adjust Mode Threshold
Voltage
mV
VBAT Precharge Threshold
VBAT Recharge Threshold
VIN OVP Rising Threshold
VIN OVP Falling Threshold
VIN OVP Hysteresis
2.8
200
6.8
6.5
300
165
10
2.7
170
6.525
6.2
2.9
230
7.0
V
mV
V
VBAT - VBATTERY
6.8
V
200
400
mV
°C
mA
Over Temperature Shutdown
Status Output Source Current
Hysteresis = 10°C
Pre-Charge or Fast-Charge
VSTAT = 2.8V
End of Charge, VSTAT= 0.25V
1
1
mA
µA
No Adaptor or LDO mode,
High Impedance
OVP Output Source Current
CP Output Source Current
VCC > OVP
10
10
mA
mA
µA
VCC > UVLO
BSENSE Input Leakage
Current
0.1
1
STAT, OVP, CP Outputs
VOH
Load = 10mA
Load = 1mA
Load = -500µA
Load = 0mA
2.4
2.6
V
VOL
VOH
0.25
3.0
V
V
STAT Output
2.8
4
EN, BIP, VPRGM Inputs
VIH
VIL
1.8
V
V
0.4
10
EN Input Sink Current
** Thermally Limited
EN Voltage = 1.8V
uA
2004 Semtech Corp.
3
www.semtech.com
SC803
POWER MANAGEMENT
Pin Configuration
Ordering Information
DEVICE(1)
SC803IMLTR
SC803IMLTRT(2)
SC803EVB(3)
PACKAGE
VOUT VOUT VCC VCC
MLP16
MLP16
16
15
14
13
NC
Evaluation Board
12
11
10
9
BSEN
VPRGM
IPRGM
1
2
3
4
TOP VIEW
Notes:
CP
(1) Only available in tape and reel packaging. A reel con-
tains 3,000 devices.
STAT
OVP
(2) TRT extension designates the lead-free leadframe
package option.
T
ITERM
(3) Specify the desired IC part number when ordering.
5
6
7
8
NC
GND
EN
BIP
MLP16: 4X4 16 LEAD
Pin Descriptions
Pin #
Pin Name
BSEN
Pin Function
Battery voltage sense pin. Connect to battery terminal to Kelvin sense battery voltage. Do not
leave this pin floating.
1
2
3
VPRGM
IPRGM
Selectable voltage program pin. Logic low = 4.1V. Logic high = 4.2V. Resistor = adjustable.
Charger current program pin in fast charge mode. Requires a resistor to ground to program
fast-charge current.
Selection for current termination and pre-charge current. Requires a resistor to ground to
program pre-charge and termination current.
4
ITERM
5
6
7
NC
GND
EN
No Connect
Ground
Device enable/disable pin. Logic high enables device. Logic low disables device.
Input derived from external circuitry or microcontroller that signals Battery In Place. Logic high
indicates Battery In Place and in charging mode. Logic low puts device into LDO mode. Do
not leave this pin floating.
8
BIP
9
OVP
Overvoltage fault flag if charger input voltage is higher than 6.5V. This pin can source 10mA.
Charger Status Pin: Pre-charge (High), Fastcharge (High) and end of charge (Low). When in
LDO mode this pin is high impedance. This pin can source 10mA.
10
STAT
Charger present indicator, logic high when there is power to the VCC pins regardless of the
Enable pin state. This pin can source 10mA.
11
CP
12
13
14
15
16
NC
No Connect
VCC
VCC
VOUT
VOUT
Supply pin, connect to adaptor power.
Supply pin, connect to adaptor power.
Charger output, connect to battery.
Charger output, connect to battery.
Thermal-conduction pad on bottom of the package. Solder directly to the ground plane with
multiple thermal vias to all other ground planes.
T
Thermal Pad
2004 Semtech Corp.
4
www.semtech.com
SC803
POWER MANAGEMENT
Block Diagram
VCC
13,14
Fast Charge
Enable
EN
EN 7
UV
OV
Control
Charge
Pump
OVP
9
1.2V
1.2V
4.2V
+
-
100
100
1
0.1
Reference
and OT SD
GND
6
4.1V
3.0V
15,16 VOUT
EN
-
STAT
CP
10
11
Status
+
Vout
8
1
BIP
BSEN
1.2V
V_FB
-
+
-
Vprog
Detect
+
VPRGM
2
Termination
-
+
1.2V
4.2V
4.1V
3.0V
4
3
ITERM
IPRGM
2004 Semtech Corp.
5
www.semtech.com
SC803
POWER MANAGEMENT
Applications Information
Monitor Mode
Pre-Charge Mode
In the monitor mode the voltage of the battery will be
monitored against the programmed voltage. This will oc-
cur after a battery has been fully charged and the device
has shut off. If the voltage of the battery falls below the
recharge threshold (specified at 200mV) the charger will
activate and charge the battery to its programmed volt-
age. This means that it will enter the full charging se-
quence from fast-charge to terminating the charging cycle
when the programmed termination current is reached.
The maximum current drain of the battery during moni-
tor mode will be no more than 1uA over temperature.
Pre-charge mode is automatically enabled whenever the
battery voltage is below 2.8V. It is primarily used to limit
the power dissipation of the battery and the SC803 de-
vice whenever the battery is undercharged. As the bat-
tery begins to charge in this mode, the voltage of the
battery will rise and when the 2.8V limit is reached, the
SC803 will switch to the fast charge mode. The pre-
charge current value is selected by the termination re-
sistor on the ITERM pin. The maximum range of the pre-
charge current is from 10mA to 125mA. Whenever the
charger is in pre-charge or fast-charge the status LED
will light indicating that the battery is being charged. The
equation to select the pre-charge current is given by:
LDO Mode
One of the nice features of the SC803 is its ability to
work with or without a battery. If the battery is not in
place the device can enter the LDO mode. In this mode
the SC803 will act like a low dropout regulator. The out-
put voltage is set to 4.1V, 4.2V or externally set by a
2.8
PCI=
• 88
RTERM
Fast-Charge Mode
The fast-charge mode exists while the battery voltage is resistor divider. See the section titled “Configuring the
above 2.8V and the battery is not fully charged. The fast- Output Voltage to the Battery” for setting an output volt-
charge current can be set to a maximum of 1.5A and is age other than 4.1V or 4.2V. The input pin BIP (Battery
selected by the program resistor on the IPRGM pin. In In Place) is used to switch the SC803 from charger mode
fact, the voltage on this pin will represent the current to LDO mode. If this pin is logic high the device will be in
through the battery enabling a microprocessor or ana- charger mode, if it is logic low it will be in the LDO mode.
log-to-digital converter (ADC), to monitor battery current During LDO mode the device will regulate the output volt-
by sensing the voltage on the IPRGM pin. The equation age with a current limit set by the resistor tied to the
to set the fast-charge current is given by:
IPRGM pin. The BIP pin can be tied to the CP pin to place
the device in charge mode whenever the adaptor is in
place. The maximum voltage on the BIP input pin is 6V,
so do not tie it to the VCC input since this voltage can
exceed 6V in some conditions. The BIP pin should never
be left floating, but instead, should be tied through pull-
up/pull-down resistors when connected to a high imped-
ance control pin, otherwise it can be connected directly
to the CP pin or GND. The equation for setting the cur-
rent limit in the LDO mode will be:
1.5
FCI=
•1000
RPRGM
Note that for a given program resistor the current through
the battery can be determined by replacing 1.5 with the
actual voltage on the IPRGM pin in the above equation.
Termination Current
Once the battery reaches the program voltage of 4.1V,
4.2V or externally set voltage, the device will transition
from a constant current source to a constant voltage
source, as the current through the battery begins to de-
crease while the voltage remains constant. During this
time when the current falls below the programmed ter- LED Flags
1.5
ILDO=
•1000
RPRGM
mination current set by the termination resistor on the There are three LED drivers on the SC803: OVP (Over
ITERM pin, the SC803 will turn off and the end of charge Voltage), STAT (Status) and CP (Charger Present). Each
will be indicated by the status LED turning off. The equa- output can drive an LED directly without a current limit
tion to set the termination current is given by:
resistor. In addition, each output can be monitored by a
microprocessor for change in their status. The following
table defines each LED output.
1.5
ITERM=
• 88
RTERM
2004 Semtech Corp.
6
www.semtech.com
SC803
POWER MANAGEMENT
C1
Applications Information (Cont.)
330pF
R4
HIGH
IMPEDANCE
R3
LED FLAG
CP
ON
OFF
100K
59K
+5V
14
13
3
11
10
9
VCC
VCC
IPRGM
EN
CP
STAT
OVP
POWER TO VCC
PINS
NO POWER TO
VCC PINS
X
7
2
VPRGM
BSEN
VOUT
VOUT
NC
4
1
ITERM
BIP
8
16
15
12
6
GND
NC
5
VCC OVER-
VOLTAGE
VCC VOLTAGE
NORMAL
CHARGER
C2
R1
R2
SC803
FAULT
STATUS
PRESENT
X
OVP
1uF
C3
2.2uF
BATTERY
BATTERY
CHARGING
BATTERY FULLY
CHARGED
LDO MODE
STAT
R4
R3
VOUT = 1 +
• 3.0
The CP output can be used for a UVLO indicator. Regard-
less of the state of EN, the CP output reflects the volt-
age of the VCC (adapter) input. When VCC is above UVLO,
CP is high, 2.8V. When VCC is below UVLO, CP is low, 0V.
The CP pin can also put the device into the charge mode
whenever the adaptor has power, by connecting it to the
BIP pin.
The OVP LED will light whenever the SC803 is enabled
and there is an overvoltage on the VCC pins. When this
occurs the SC803 will turn off and stay off as long as the
overvoltage condition remains. As soon as the overvolt-
age is removed the SC803 will resume operation. The
OVP LED will not light if the part is disabled, even though
an overvoltage is present on the VCC pins.
FIGURE 1
Remote Kelvin Sensing at the Battery
Another nice feature of the SC803 is its ability to sense
the battery voltage directly at the battery with its Kelvin
BSEN pin. This allows the designer great flexibility in PCB
layout and achieves a much greater accuracy in sensing
the battery voltage where it counts, at the battery termi-
nals! Therefore, when laying out the PCB the designer
should route the BSEN pin directly to the terminal at which
the battery gets connected. In addition, in the LDO mode,
the BSEN pin will still need to sense the output voltage.
In LDO mode, the BSEN pin becomes the regulation feed-
back for the control-loop. In this case it is sensing the
output voltage of itself, since the battery is not in place.
Therefore BSEN should never be left floating.
Configuring the Output Voltage to the Battery
The battery voltage is set by the VPRGM pin. If this pin is
logic high the output voltage is set to 4.2V. If this pin is
logic low the output voltage will be set to 4.1V. The VPRGM
pin can be tied to the CP pin for 4.2V operation and ground
for 4.1V operation. For a value other than 4.1V or 4.2V a
resistor divider is required. This divider is set between
the VOUT pin and the VPRGM pin with the divider tap
connected to the BSEN pin. The schematic for such a
connection and the equation to set the output voltage is
given in Figure 1. The output voltage for Figure 1 will be
set to 4.77V with the resistors shown. The capacitor C1
may be needed for stability and or reduced ripple volt-
age. It is advisable to leave room on the PCB for adding
this capacitor, since it can be left out if it is not needed.
The evaluation board does have a place for the resistor
divider and capacitor to allow an adjustable voltage to
be set on this board via R1, R2 and C2 (see schematic
on page 10). With JP7 removed, jumper JP2 should be
added to complete the changes required for adjustable
mode operation on the evaluation board. For further
evaluation board information, see the section tilted Evalu-
ation Board.
Capacitor Selection
Input and output capacitors can be low cost ceramic type.
The output capacitance range is 1uF to 4.7uF. The input
capacitor should be between 0.1uF to 1uF.
Overcurrent and Temperature Protection
Overcurrent protection is inherent to the SC803. The
SC803 operates as a current source and the output cur-
rent is limited by the mode it is in at the time. If in the
fast-charge mode the current is limited by the IPRGM
resistor, the fast-charge current. When the output volt-
age is less than 2.8V, the current is limited by the ITERM
resistor, the pre-charge current. Both of these functions
protect the device in an event of a short circuit condition
on the output. In the LDO mode the current is limited to
the fast-charge current, provided there is voltage on the
output. Under a short circuit condition in the LDO mode
the current will enter a “hiccup” mode. The temperature
shutdown can protect the device in conditions of excess
current as well, by shutting down the device when its die
temperature exceeds 165oC.
2004 Semtech Corp.
7
www.semtech.com
SC803
POWER MANAGEMENT
Applications Information (Cont.)
Using the SC803 With a Charge Controller IC
justable voltage see the section titled, Configuring the
Output Voltage to the Battery. Note, only one of these
jumpers JP2 or JP7 should be inserted at any given time.
Jumper JP8 should be left open and is used only for test-
ing SC801M operation. Connector J1 is used for con-
necting the evaluation board to a demonstration plat-
form to exemplify the SC803 operation. Other compo-
nents on the eval board consist of Semtech’s SD12 and
SD05 ESD clamp diodes which should be part of any
system requiring ESD protection. LED’s for status infor-
mation and TP3 which will allow the current through the
battery to be monitored. The input capacitor C1 is cho-
sen to be 10uF to decouple any inductance from a labo-
ratory supply when evaluation is taking place.
The SC803 can also be used with numerous charge con-
troller ICs on the market. In many instances the charge
controller will control the charging and termination of the
SC803. The best method of interfacing the SC803 with
such a device is to place the SC803 in LDO mode, and
monitor the current to the battery by an ADC that
samples the voltage on the IPRGM pin. Slow and fast
charge can be controlled by placing two resistors in se-
ries from IPRGM to GND and adding a transistor switch
across one of the resistors. This way the current can be
monitored for proper termination by the charge control-
ler. In LDO mode the STAT LED will not light. When charg-
ing the battery in LDO mode the charge profile will be the
same as in charge mode except there will be no precharge
or termination current function. Meanwhile, the maxi-
mum current the battery will see is set by the battery
equivalent circuit or the fast-charge current limit. The
battery will still charge in this mode, albeit a slightly dif-
ferent approach than placing the charger in the charge
mode.
Complete Charge Cycle
The complete charge cycle of the SC803 is shown on
page 15. The pre-charge current will be under control
until the precharge threshold of 2.8V is reached. At this
time the device enters the fast-charge mode and the
output voltage continues to increase as the constant
current is applied to the battery. Eventually constant volt-
age is reached and the current begins to decrease until
the termination current threshold is reached at which
time the SC803 will turn off. Many Lithium-Ion batteries
have a built in under-voltage detect circuit. This makes
the battery pack open circuited when the battery volt-
age falls below 3V typically. With these batteries the
SC803 will unlikely enter pre-charge operation because
the battery voltage will always be above 2.8V.
Evaluation Board
The evaluation board is shown on Page 10. The evalua-
tion board was designed to test the complete operation
of the SC803. Note the minimum parts requirement is
shown within the dotted rectangle on the schematic. The
adaptor voltage of 5V is applied to TP1 and TP2 which
supplies power to the SC803. The output charger volt-
age or LDO output voltage is taken off of TP4 and TP5.
Jumper JP5 will set the device in LDO mode when in-
serted or charge mode when left open. Jumper JP6 will
enable the device when inserted or disable the device
when left open. Note as long as power is applied to VCC
the CP LED will light, regardless of the EN pin level. Jumper
JP4 is used to measure the bias current of the SC803
and should always be in place except when measuring
bias current. JP1 and JP3 set the charge limit voltage to
4.2V or 4.1V respectively. Only one of these jumpers JP1
or JP3 should be in place at any given time. If you expect
VCC to exceed 6V (testing breakdown of the SC803) and
you want to set the output voltage to 4.2V you should
remove any jumper on JP1 and manually tie pin 2 of JP1
to the CP pin, because the absolute maximum voltage
on the VPRGM input pin is 6V. Jumper JP7 when inserted
will short the BSEN line to Vout for charging Lithium-Ion
batteries. Jumper JP2 should be inserted when an ad-
justable voltage is required, with the addition of R1, R2
& C2. For more information about selection of an ad-
2004 Semtech Corp.
8
www.semtech.com
SC803
POWER MANAGEMENT
Applications Information (Cont.)
Layout Guidelines
Try to keep the traces from the adaptor input to the VCC
pins as wide as possible, to eliminate any voltage drop
across the device input traces. You want to make sure
the input-to-output voltage differential of the device does
not approach the dropout voltage. A curve of the drop-
out voltage vs. output current is shown on page 15. Any
voltage dropped over the input traces from the adaptor
will reduce the dropout voltage margin.
Make the high current output trace from the VOUT pins
as wide as possible. The BSEN line should be used prop-
erly to compensate for any voltage drops from the out-
put trace to the battery. Make a Kelvin connection with
the BSEN trace to where VOUT connects the battery ter-
minals. This is done by taking the BSEN trace and tying it
to the VOUT trace as close to the battery terminals as
possible. This way, any voltage drop across the trace re-
sistance to the battery will be compensated for because
BSEN will regulate the device output voltage (VOUT) at
the point it connects to the VOUT trace. If you tie the
BSEN line to the VOUT pin at the device you will eliminate
the benefit of its purpose and the trace resistance drop
will not be compensated. Therefore, it is best to have
the BSEN trace follow in parallel the VOUT trace and tie
them together at the contact point of the battery termi-
nal for the best result.
The bottom of the SC803 package has a heat slug and
this slug should be tied to a ground plane of the PCB
through one large via or a series of smaller vias. If there
is no ground plane, an area should be dedicated on the
bottom of the PCB to act as a heat sink. The evaluation
board has 1 square inch of copper and allows an output
current of greater that 1A. The more copper tied to this
slug the greater the output current available before ther-
mal limitations dominate. The two pins that are labeled
NC are not connected to the die. Therefore, tying these
pins to the ground plane offers no aide in heat removal
and has no electrical benefit.
2004 Semtech Corp.
9
www.semtech.com
SC803
POWER MANAGEMENT
Evaluation Board Schematic
J1
1
3
2
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
4
5
6
7
8
9
10
12
14
16
11
13
15
CON16AP
TP1
TP2
+5VIN
GND
JP1
4.2V
JP2
1
1
2
2
1
2
TP3
ISENSE
Adjustable Vout
D1
SD12
+
C1
JP4
JP3
R1
10uF/25V
BIAS
4.1V
OPEN
TP4
TP5
JP5
JP6
GND
U1
CHGR / LDO
ENABLE / DISABLE
C3
VOUT / VCHG
0.1uF
14
13
3
12
C2
R2
JP7
VCC
VCC
IPRGM
EN
NC
2
OPEN
OPEN Li-Ion
VPRGM
STAT
OVP
10
9
7
4
1
ITERM
BIP
BSEN
VOUT
VOUT
CP
8
16
15
11
6
GND
NC
5
R3
R4
1M
R5
1.24K
R6
D2
100K
3.01K
SD05
SC803
D3
CP
D4
D5
STATUS
C4
FAULT
2.2uF
JP8
1
2
R7
619
SC801/SC801M
Evaluation Board Gerber Plots
Bottom Gerber
Top Gerber
Inner Gerber
Silk Screen Gerber
2004 Semtech Corp.
10
www.semtech.com
SC803
POWER MANAGEMENT
LDO Mode Timing Diagram
LDO Mode
6.5V
6.3V
5V
Vcc
BIP
4.2V
Low
4.2V
Vout
4ms
1ms 1ms
1ms 1ms 4ms
ILIMIT
Iout
ILIMIT
Soft Start
Precharge
Limit
1ms
CP
OVP
Stat
High Z
EN
2004 Semtech Corp.
11
www.semtech.com
SC803
POWER MANAGEMENT
Charge Mode Timing Diagram
Charge Mode
4.2V
Vcc
BIP
4.0V
4.2V
Vout
4ms
1ms
1ms
2.8V
precharge
Icharge
1ms
1ms
Iout
4ms
Soft Start
Termination
Current
Precharge
Limit
End of Charge
CP
OVP
Stat
Monitor
Mode
EN
2004 Semtech Corp.
12
www.semtech.com
SC803
POWER MANAGEMENT
State Diagram
Vin > UVLO
Shutdown Mode
Vout/Iout off
CP,STAT,OVP Low
Over Voltage, Under
Voltage, or Over
Temperature will
force the SC803 into
Shutdown Mode from
any state.
CP Output = High
En = High
And
Tj < Over Temp SD
Yes
Charge Mode
STAT=High,
LDO Mode
STAT = High Z,
Yes
BIP High
Start Pre-Charge
Iout = 246/Rterm
VOUT > 2.8V
Yes
BSEN = CV
Soft Start
Fast Charge Mode
Iout > 1500/Rprog
Yes
VOUT > 2.8V
Yes
Iout = 1500/Rprog
LDO Current Limit
BSEN = CV
Iout = 1500/Rprog
Yes
Start CV Mode
BSEN = CV ?
Yes
IOUT < ITERM
Yes
Monitor Mode
STAT = Low
Vout off
BSEN < CV-200mV
Yes
2004 Semtech Corp.
13
www.semtech.com
SC803
POWER MANAGEMENT
Typical Characteristics
Charge Mode Bias Current vs Input Voltage
LDO Mode Bias Current vs Input Voltage
16
14
12
10
8
6
4
2
1.75
1.5
1.25
1
2
0
4.3
4.7
5.1
5.5
5.9
6.3
6.7
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 6.3 6.5 6.7 6.9
Input Voltage (Volts)
Input Voltage (Volts)
Fast Charge Current vs IPRGM Resistance
Vout Leakage Current vs Temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1400
1200
1000
800
600
400
200
0
1.2 1.3 1.5 1.6 1.9 2.2 2.6 3.1 4.0 5.6 9.4 27.6
-40
-20
0
20
40
60
80
100
120
IPRGM Resistance (kohm)
Temperature (Degrees C)
Output Voltage vsTemperature
Output Voltage vs Temperature
4.21
4.11
4.1
4.2
4.19
4.18
ILOAD = 250mA
ILOAD = 500mA
ILOAD = 250mA
ILOAD = 500mA
4.09
4.08
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
Temperature (Degrees C)
Temperature (Degrees C)
2004 Semtech Corp.
14
www.semtech.com
SC803
POWER MANAGEMENT
Typical Characteristics
Dropout Voltage vs Output Current
IPRGM Voltage vs Output Current
1600
1400
1200
1000
800
600
400
200
0
650
550
450
350
250
150
50
RPRGM = 1.87K
0
200 400 600 800 1000
10
210
410
610
810 1010
Output Current (mA)
Output Current (mA)
Battery Charge Profile
4.5
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
4
3.5
3
Vout
Iout
2.5
2
1.5
Charge Time
2004 Semtech Corp.
15
www.semtech.com
SC803
POWER MANAGEMENT
Outline Drawing - MLP (16 pin)
DIMENSIONS
INCHES MILLIMETERS
DIM
A
MIN NOM MAX MIN NOM MAX
A
D
-
-
-
-
.031
A1 .000
.040 0.80
.002 0.00
1.00
0.05
-
B
E
-
(.008)
-
-
(0.20)
A2
b
D
.010 .012 .014 0.25 0.30 0.35
.153 .157 .161 3.90 4.00 4.10
PIN 1
INDICATOR
D1 .074 .085 .089 1.90 2.15 2.25
.153 .157 .161 3.90 4.00 4.10
E
(LASER MARK)
E1 .074 .085 .089 1.90 2.15 2.25
e
.026 BSC
0.65 BSC
L
N
.018 .022 .026 0.45 0.55 0.65
16
.003
.004
16
0.08
0.10
aaa
bbb
A2
A
SEATING
PLANE
aaa C
A1
C
D1
e/2
LxN
E/2
E1
2
1
N
e
bxN
bbb
C A B
D/2
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
Marking Information
Top Mark
yy = two-digit year of manufacture
ww = two-digit week of manufacture
2004 Semtech Corp.
16
www.semtech.com
SC803
POWER MANAGEMENT
Land Pattern MLP-16 pin
K
DIMENSIONS
INCHES MILLIMETERS
DIM
(.148)
.106
.091
.091
.026
.016
.041
.189
(3.75)
2.70
2.30
2.30
0.65
0.40
1.05
4.80
C
G
H
K
P
X
Y
Z
2x Z
H
2x G
Y
2x (C)
X
P
NOTES:
1.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation
Portable Power Management Products Division
200 Flynn Rd., Camarillo, CA 93012-8790
Phone: (805)498-2111 FAX (805)498-3804
2004 Semtech Corp.
17
www.semtech.com
相关型号：
©2020 ICPDF网 联系我们和版权申明