SEMTECH SC803

SC803
Fully Integrated High Current
Lithium-Ion Battery Charger System
POWER MANAGEMENT
Description
Features
‹ Fully integrated charger with FET pass transistor,
The SC803 is a fully integrated, single cell, constant-current constant-voltage Lithium-Ion battery charger management 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.
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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 information 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 guaranteed.
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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 current source or as a current source for charging nickelcadmium (NiCd) and nickel-metal-hydride (NiMH) batteries using external termination.
Applications
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Typical Application Circuit
14
13
3
7
4
8
6
5
CHARGER VIN
C1
1uF
R1
R2
reverse-blocking diode, sense resistor and thermal
protection
Complete voltage ranges of 4.1V, 4.2V &
adjustable
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
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
°C/watt
Low thermal impedance of 50°
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
VCC
CP
VCC
STAT
IPRGM
OVP
EN
VPRGM
BSEN
ITERM
BIP
VOUT
GND
VOUT
NC
NC
Cellular phones
PDA’s
Handheld meters
Charging stations
Handheld computers
Digital cameras
Programmable current source
11
10
9
2
1
16
15
12
BATTERY
2.8 
Pre − Charge Current = 
 • 88
 R2 
Revision 4, November 2004
FAULT
SC803
1.5 
Fast − Charge Current = 
 • 1000
 R1 
1
STATUS
CHARGER
PRESENT
C2
2.2uF
1.5 
Termination Current = 
 • 88
 R2 
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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
VC C , EN to GND
VOUT, VPRGM, IPRGM, C P, OVP, STAT, ITERM, BIP to GND
Power D i ssi pati on
MLP (D erate 20mW/ °C above 85 °C )
PD
VOUT short to GND
Maximum
U nits
-0.3 to 7.0
V
-0.3 to +6.0
V
2.5
W
C onti nuous
Thermal Resi stance, Juncti on to Ambi ent
θJ A
48
°C /W *
Operati ng Juncti on Temperature
TJ
150
°C
TR opti on
TIRRT
240
°C
TRT opti on (lead-free leadframe)
TIRRT
260
°C
Storage Temperature
TSTG
-65 to 150
°C
ESD Rati ng (Human Body Model)
ESD
2
kV
IR Reflow Temperature
(Solderi ng) 10 seconds
* 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
TA
Units
(-40°C to +85°C)
Min
Min
Max
VC C
4.2
7
V
Operating Voltage
VOP
4.2
6.5
V
Operating Current
ICC
Input Voltage
Typ
Charging Mode
OVP, STATUS, CP = 0µA
2
LDO Mode
OVP, STATUS, CP = 0µA
25
Battery Leakage Current
IVOUT
V C C = 0V
0.1
Regulated Voltage
VBAT
VPRGM = Logic High
VPRGM = Logic Low
4.20
4.10
VPRGM = External Divider
VCC = 4.2V - 6.5V
Adjust Mode Feedback
Voltage
Battery Pre-Charge Current
P CI
Battery Termination Current
ITERM
Battery Fast-Charge Current
FCI
 2004 Semtech Corp.
Max
ITERM Resistor = 3.01kΩ
VBATTERY > 2.5V
IPRGM = 3.01kΩ
IPRGM = 1.87kΩ
VBATTERY = 3.8V
Dropout Voltage = 550mV
2
mA
1
µA
4.16
4.06
4.24
4.14
V
3.0
2.97
3.03
V
82
72
92
45
38
52
500
800
450
750
550
850
mA
mA
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SC803
POWER MANAGEMENT
Electrical Characteristics Cont.
Unless otherwise noted: VCC = 4.75V - 5.25V
Parameter
Symbol
C onditions
25°C
TA
U nits
(-40°C to
+85°C )
Min
Typ
Max
Min
2.8V < VBATTERY < VBAT
D ropout voltage = 1V
Battery Fast-C harge
C urrent Li mi t
1.5**
A
1.6
V
4.3
V
IPROG Regulated Voltage
1.5
VIN UVLO Ri si ng Threshold
4.2
Adjust Mode Threshold
Voltage
90
VBAT Precharge Threshold
2.8
2.7
2.9
V
200
170
230
mV
VIN OVP Ri si ng Threshold
6.8
6.525
7.0
V
VIN OVP Falli ng Threshold
6.5
6.2
6.8
V
VIN OVP Hysteresi s
300
200
400
mV
VBAT Recharge Threshold
VBAT - VBATTERY
1.4
Max
mV
Over Temperature Shutdown
Hysteresi s = 10°C
165
°C
Status Output Source C urrent
Pre-C harge or Fast-C harge
VSTAT = 2.8V
10
mA
End of C harge, VSTAT= 0.25V
1
mA
No Adaptor or LD O mode,
Hi gh Impedance
1
µA
VC C > OVP
10
mA
VC C > UVLO
10
mA
OVP Output Source C urrent
C P Output Source C urrent
BSENSE Input Leakage
C urrent
STAT, OVP, C P Outputs
0.1
VOH
Load = 10mA
2.4
Load = 1mA
2.6
VOL
Load = -500µA
STAT Output
VOH
Load = 0mA
EN, BIP, VPRGM Inputs
VIH
2.8
EN Voltage = 1.8V
4
µA
V
0.25
V
3.0
V
1.8
VIL
EN Input Si nk C urrent
1
V
0.4
V
10
uA
** Thermally Limited
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SC803
POWER MANAGEMENT
Pin Configuration
VOUT VOUT
16
BSEN
1
VPRGM
2
IPRGM
3
15
Ordering Information
VCC
VCC
14
13
D EVIC E(1)
12
NC
11
CP
5
6
7
8
NC
GND
EN
BIP
MLP16
SC 803IMLTRT
MLP16
S C 803E V B
Evaluati on Board
10
STAT
9
OVP
(3)
Notes:
(1) Only available in tape and reel packaging. A reel contains 3,000 devices.
(2) TRT extension designates the lead-free leadframe
package option.
(3) Specify the desired IC part number when ordering.
T
4
SC 803IMLTR
(2)
TOP VIEW
ITERM
PAC K AGE
MLP16: 4X4 16 LEAD
Pin Descriptions
Pin #
Pin N ame
1
BSEN
2
VPRGM
Selectable voltage program pi n. Logi c low = 4.1V. Logi c hi gh = 4.2V. Resi stor = adjustable.
3
IPRGM
C harger current program pi n i n fast charge mode. Requi res a resi stor to ground to program
fast-charge current.
4
ITERM
Selecti on for current termi nati on and pre-charge current. Requi res a resi stor to ground to
program pre-charge and termi nati on current.
5
NC
6
GND
7
EN
D evi ce enable/di sable pi n. Logi c hi gh enables devi ce. Logi c low di sables devi ce.
8
BIP
Input deri ved from external ci rcui try or mi crocontroller that si gnals Battery In Place. Logi c hi gh
i ndi cates Battery In Place and i n chargi ng mode. Logi c low puts devi ce i nto LD O mode. D o
not leave thi s pi n floati ng.
9
OVP
Overvoltage fault flag i f charger i nput voltage i s hi gher than 6.5V. Thi s pi n can source 10mA.
10
STAT
C harger Status Pi n: Pre-charge (Hi gh), Fastcharge (Hi gh) and end of charge (Low). When i n
LD O mode thi s pi n i s hi gh i mpedance. Thi s pi n can source 10mA.
11
CP
C harger present i ndi cator, logi c hi gh when there i s power to the VC C pi ns regardless of the
Enable pi n state. Thi s pi n can source 10mA.
12
NC
No C onnect
13
VC C
Supply pi n, connect to adaptor power.
14
VC C
Supply pi n, connect to adaptor power.
15
VOUT
C harger output, connect to battery.
16
VOUT
C harger output, connect to battery.
T
Thermal Pad
 2004 Semtech Corp.
Pin Function
Battery voltage sense pi n. C onnect to battery termi nal to Kelvi n sense battery voltage. D o not
leave thi s pi n floati ng.
No C onnect
Ground
Thermal-conducti on pad on bottom of the package. Solder di rectly to the ground plane wi th
multi ple thermal vi as to all other ground planes.
4
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SC803
POWER MANAGEMENT
Block Diagram
VCC
13,14
Fast Charge
Enable
EN 7
EN
UV
Control
OVP 9
Charge
Pump
OV
1.2V
Reference
and OT SD
GND 6
1.2V
+
-
100
4.2V
1
100
4.1V
EN
0.1
15,16 VOUT
+
3.0V
Vout
+
+
-
BIP 8
+
Status
Termination
STAT 10
CP 11
BSEN 1
1.2V
V_FB
Vprog
Detect
+
+
-
VPRGM 2
4.2V
1.2V
+
Termination
4.1V
3.0V
4
ITERM
 2004 Semtech Corp.
5
3
IPRGM
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SC803
POWER MANAGEMENT
Applications Information
Monitor Mode
In the monitor mode the voltage of the battery will be
monitored against the programmed voltage. This will occur 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 voltage. This means that it will enter the full charging sequence from fast-charge to terminating the charging cycle
when the programmed termination current is reached.
The maximum current drain of the battery during monitor mode will be no more than 1uA over temperature.
Pre-Charge Mode
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 device whenever the battery is undercharged. As the battery 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 precharge current value is selected by the termination resistor on the ITERM pin. The maximum range of the precharge 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 output voltage is set to 4.1V, 4.2V or externally set by a
resistor divider. See the section titled “Configuring the
Output Voltage to the Battery” for setting an output voltage other than 4.1V or 4.2V. The input pin BIP (Battery
In Place) is used to switch the SC803 from charger mode
to LDO mode. If this pin is logic high the device will be in
charger mode, if it is logic low it will be in the LDO mode.
During LDO mode the device will regulate the output voltage with a current limit set by the resistor tied to the
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 pullup/pull-down resistors when connected to a high impedance control pin, otherwise it can be connected directly
to the CP pin or GND. The equation for setting the current limit in the LDO mode will be:
 2.8 
 • 88
PCI = 
 R TERM 
Fast-Charge Mode
The fast-charge mode exists while the battery voltage is
above 2.8V and the battery is not fully charged. The fastcharge current can be set to a maximum of 1.5A and is
selected by the program resistor on the IPRGM pin. In
fact, the voltage on this pin will represent the current
through the battery enabling a microprocessor or analog-to-digital converter (ADC), to monitor battery current
by sensing the voltage on the IPRGM pin. The equation
to set the fast-charge current is given by:
 1.5 
 • 1000
FCI = 
 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 decrease while the voltage remains constant. During this
time when the current falls below the programmed termination current set by the termination resistor on the
ITERM pin, the SC803 will turn off and the end of charge
will be indicated by the status LED turning off. The equation to set the termination current is given by:
 1.5 
 • 1000
ILDO = 
 RPRGM 
LED Flags
There are three LED drivers on the SC803: OVP (Over
Voltage), STAT (Status) and CP (Charger Present). Each
output can drive an LED directly without a current limit
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 
 • 88
ITERM = 
 R TERM 
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SC803
POWER MANAGEMENT
Applications Information (Cont.)
LED FLAG
ON
OFF
C1
330pF
HIGH
IMPEDANCE
+5V
CP
POWER TO VCC
P IN S
N O POWER TO
VCC PIN S
X
OVP
VCC OVERVOLTAGE
VCC VOLTAGE
N ORMAL
X
BATTERY
CHARGIN G
BATTERY FULLY
CHARGED
LDO MODE
STAT
14
13
3
7
4
8
6
5
C2
1uF
R1
R2
CP
VCC
VCC
STAT
OVP
IPRGM
VPRGM
EN
ITERM
BSEN
BIP
VOUT
GND
VOUT
NC
NC
R3
R4
100K
59K
11
10
9
2
1
16
15
12
SC803
BATTERY
C3
2.2uF
FAULT
STATUS
CHARGER
PRESENT
R4 

VOUT =  1 +
 • 3.0
R3 

The CP output can be used for a UVLO indicator. Regardless of the state of EN, the CP output reflects the voltage 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 overvoltage 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 terminals! 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 feedback for the control-loop. In this case it is sensing the
Configuring the Output Voltage to the Battery
output voltage of itself, since the battery is not in place.
The battery voltage is set by the VPRGM pin. If this pin is
Therefore BSEN should never be left floating..
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
Capacitor Selection
pin can be tied to the CP pin for 4.2V operation and ground
Input and output capacitors can be low cost ceramic type.
for 4.1V operation. For a value other than 4.1V or 4.2V a
The output capacitance range is 1uF to 4.7uF. The input
resistor divider is required. This divider is set between
capacitor should be between 0.1uF to 1uF.
the VOUT pin and the VPRGM pin with the divider tap
connected to the BSEN pin. The schematic for such a
Overcurrent and Temperature Protection
connection and the equation to set the output voltage is
Overcurrent protection is inherent to the SC803. The
given in Figure 1. The output voltage for Figure 1 will be
SC803 operates as a current source and the output curset to 4.77V with the resistors shown. The capacitor C1
rent is limited by the mode it is in at the time. If in the
may be needed for stability and or reduced ripple voltfast-charge mode the current is limited by the IPRGM
age. It is advisable to leave room on the PCB for adding
resistor, the fast-charge current. When the output voltthis capacitor, since it can be left out if it is not needed.
age is less than 2.8V, the current is limited by the ITERM
The evaluation board does have a place for the resistor
resistor, the pre-charge current. Both of these functions
divider and capacitor to allow an adjustable voltage to
protect the device in an event of a short circuit condition
be set on this board via R1, R2 and C2 (see schematic
on the output. In the LDO mode the current is limited to
on page 10). With JP7 removed, jumper JP2 should be
the fast-charge current, provided there is voltage on the
added to complete the changes required for adjustable
output. Under a short circuit condition in the LDO mode
mode operation on the evaluation board. For further
the current will enter a “hiccup” mode. The temperature
evaluation board information, see the section tilted Evalushutdown can protect the device in conditions of excess
ation Board.
current as well, by shutting down the device when its die
temperature exceeds 165oC.
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SC803
POWER MANAGEMENT
Applications Information (Cont.)
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 testing SC801M operation. Connector J1 is used for connecting the evaluation board to a demonstration platform to exemplify the SC803 operation. Other components 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 information and TP3 which will allow the current through the
battery to be monitored. The input capacitor C1 is chosen to be 10uF to decouple any inductance from a laboratory supply when evaluation is taking place.
Using the SC803 With a Charge Controller IC
The SC803 can also be used with numerous charge controller 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 series 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 controller. In LDO mode the STAT LED will not light. When charging 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 maximum 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 different 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 voltage 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 voltage 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 evaluation 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 voltage or LDO output voltage is taken off of TP4 and TP5.
Jumper JP5 will set the device in LDO mode when inserted 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 adjustable voltage is required, with the addition of R1, R2
& C2. For more information about selection of an ad 2004 Semtech Corp.
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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 dropout 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 properly to compensate for any voltage drops from the output trace to the battery. Make a Kelvin connection with
the BSEN trace to where VOUT connects the battery terminals. 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 resistance 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 terminal 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 thermal 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.
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SC803
POWER MANAGEMENT
Evaluation Board Schematic
1
3
5
7
9
11
13
15
J1
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
2
4
6
8
10
12
14
16
TP2
GND
1
1
CON16AP
TP1
+5VIN
1
1
JP4
BIAS
JP3
4.1V
2
1
JP2
2
Adjustable Vout
2
R1
OPEN
2
TP4
R3
100K
R4
1M
R5
1.24K
R6
3.01K
14
13
3
7
4
8
6
5
VCC
NC
VCC
VPRGM
STAT
IPRGM
EN
OVP
ITERM
BSEN
BIP
VOUT
GND
VOUT
NC
CP
C2
OPEN
12
2
10
9
1
16
15
11
SC803
C4
2.2uF
R7
619
1
JP8
VOUT / VCHG
R2
JP7
OPEN Li-Ion
TP5
GND
1
U1
1
C3
0.1uF
2
JP6
ENABLE / DISABLE
1
1
JP5
CHGR / LDO
1
2
1
1
D1
SD12
+
C1
10uF/25V
2
TP3
ISENSE
JP1
4.2V
D3
CP
D4
FAULT
D2
SD05
D5
STATUS
2
SC801/SC801M
Evaluation Board Gerber Plots
Bottom Gerber
Top Gerber
Inner Gerber
 2004 Semtech Corp.
Silk Screen Gerber
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SC803
POWER MANAGEMENT
LDO Mode Timing Diagram
LDO Mode
6.5V
6.3V
5V
Vcc
4.2V
BIP
Low
4.2V
Vout
1ms 1ms
4ms
1ms 1ms
ILIMIT
Iout
Precharge
Limit
4ms
ILIMIT
Soft Start
1ms
CP
OVP
Stat
High Z
EN
 2004 Semtech Corp.
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SC803
POWER MANAGEMENT
Charge Mode Timing Diagram
Charge Mode
4.2V
Vcc
BIP
4.0V
4.2V
Vout
4ms
1ms
precharge
2.8V
Iout
1ms
1ms
Precharge
Limit
Icharge
4ms
Soft Start
1ms
Termination
Current
End of Charge
CP
OVP
Stat
Monitor
Mode
EN
 2004 Semtech Corp.
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SC803
POWER MANAGEMENT
State Diagram
Vin > UVLO
Shutdown Mode
Vout/Iout off
CP,STAT,OVP Low
CP Output = High
En = High
And
Tj < Over Temp SD
Yes
LDO Mode
STAT = High Z,
Yes
BIP High
Start Pre-Charge
Over Voltage, Under
Voltage, or Over
Temperature will
force the SC803 into
Shutdown Mode from
any state.
Charge Mode
STAT=High,
VOUT > 2.8V
BSEN = CV
Yes
Iout = 246/Rterm
Soft Start
Fast Charge Mode
Iout > 1500/Rprog
Yes
LDO Current Limit
VOUT > 2.8V
Iout = 1500/Rprog
Yes
BSEN = CV
Iout = 1500/Rprog
Yes
Start CV Mode
Yes
BSEN = CV ?
IOUT < ITERM
Yes
Monitor Mode
STAT = Low
Vout off
BSEN < CV-200mV
Yes
 2004 Semtech Corp.
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SC803
POWER MANAGEMENT
Typical Characteristics
Charge Mode Bias Current vs Input Voltage
16
14
12
10
2
Bias Current (mA)
Bias Current (mA)
LDO Mode Bias Current vs Input Voltage
8
6
4
2
0
1.75
1.5
1.25
1
4.3
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
4.7
5.1
Fast Charge Current vs IPRGM Resistance
6.3
6.7
Vout Leakage Current vs Temperature
1400
1200
Leakage Current (uA)
Fast Charge Current (mA)
5.9
Input Voltage (Volts)
Input Voltage (Volts)
1000
800
600
400
200
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
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
IPRGM Resistance (kohm )
-20
0
20
40
60
80
100
120
Temperature (Degrees C)
Output Voltage vs Temperature
Output Voltage vsTemperature
4.11
Output Voltage (Volts)
4.21
Output Voltage (Volts)
5.5
4.2
ILOAD = 250mA
ILOAD = 500mA
4.19
4.18
4.1
ILOAD = 250mA
ILOAD = 500mA
4.09
4.08
-40 -20
0
20
40
60
80 100 120
-40 -20
Temperature (Degrees C)
 2004 Semtech Corp.
0
20
40
60
80 100 120
Temperature (Degrees C)
14
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SC803
POWER MANAGEMENT
Typical Characteristics
IPRGM Voltage vs Output Current
650
IPRGM Voltage (mV)
Dropout Voltage (mV)
Dropout Voltage vs Output Current
550
450
350
250
150
50
10
210
410
610
810
1600
1400
1200
1000
800
600
400
200
0
RPRGM = 1.87K
0
1010
200
400
600
800 1000
Output Current (mA)
Output Current (mA)
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
4
3.5
3
2.5
2
Vout
Iout
1:50
1:40
1:30
1:20
1:10
1:00
0:50
0:40
0:30
0:20
0:10
1.5
0:00
Charge Voltage (Volts)
4.5
Charge Current (Amps)
Battery Charge Profile
Charge Time
 2004 Semtech Corp.
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SC803
POWER MANAGEMENT
Outline Drawing - MLP (16 pin)
DIM
A
D
A
A1
A2
b
D
D1
E
E1
e
L
N
aaa
bbb
B
PIN 1
INDICATOR
(LASER MARK)
E
A2
A
aaa C
A1
C
DIMENSIONS
INCHES
MILLIMETERS
MIN NOM MAX MIN NOM MAX
.040
.002
(.008)
.012 .014
.157 .161
.085 .089
.157 .161
.085 .089
.026 BSC
.018 .022 .026
16
.003
.004
.031
.000
.010
.153
.074
.153
.074
0.80
1.00
0.00
0.05
(0.20)
0.25 0.30 0.35
3.90 4.00 4.10
1.90 2.15 2.25
3.90 4.00 4.10
1.90 2.15 2.25
0.65 BSC
0.45 0.55 0.65
16
0.08
0.10
SEATING
PLANE
D1
e/2
LxN
E/2
E1
2
1
N
e
D/2
bxN
bbb
C A B
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.
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SC803
POWER MANAGEMENT
Land Pattern MLP-16 pin
K
DIM
2x (C)
H
2x G
2x Z
Y
X
C
G
H
K
P
X
Y
Z
DIMENSIONS
INCHES
MILLIMETERS
(.148)
.106
.091
.091
.026
.016
.041
.189
(3.75)
2.70
2.30
2.30
0.65
0.40
1.05
4.80
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.
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