SC801中文资料_数据手册_规格书

SC801

Fully Integrated High Current

Lithium-Ion Battery Charger System

POWER MANAGEMENT

Description

Features

The SC801 is a fully integrated, single cell, constant-cur- u Fully integrated charger with FET pass transistor,

rent/constant-voltage Lithium-Ion\Li-Polymer battery

charger management system. The SC801 has built in in-

telligence 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

SC801 delivers up to 1.5A to the battery based on the

IPRGM pin resistor.

reverse-blocking diode, sense resistor and thermal

protection

u 4.1V, 4.2V & Adjustable Output Voltage

u Programmable precharge, fastcharge & termination

current

u Battery voltage controlled to 1% accuracy

u Soft-start for step load and adaptor plug-in

u Up to 1.5A continuous charge current

u Charge current monitor output from microcontroller

or ADC Interface

u Input voltages range from 4.2V to 14V

u 0.1µA Battery leakage in shutdown and monitor

modes

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

u Operates without a battery in regulated LDO mode

u Small 4mm x 4mm 16 lead MLP package

be monitored by the voltage on the IPRGM pin allowing a u Low thermal impedance of 50°C/watt

microcontroller or ADC to access the current informa-

u Few external components

tion to determine when to externally terminate the charge

u Over current protection in all charging modes

cycle. Once the charge cycle is complete and terminates,

u Over voltage protection

the device enters the charge monitor mode where the

u All outputs able to drive LEDs and interface to host

output voltage of the battery is monitored. If this voltage

processor

drops below the recharge threshold the device will enter

u Remote Kelvin sensing at the battery terminal

the fast charge mode again, to bring the battery to its

u Small input & output filter capacitors

fully charged state. Both the shutdown and monitor

u Status output communicates charging and end of

modes drain no more than 1uA from the battery guaran-

charge cycle

teed.

u Now Available in Lead-Free Packaging

u Charges Li-Ion, Li-Polymer, NiCd and NiMH Batteries

The output voltage to the battery is controlled to within

1% of the programmed voltage for either 4.1V or 4.2V.

Applications

The SC801 can also function as a general purpose cur-

rent source or as a current source for charging nickel- u Cellular phones

cadmium (NiCd) and nickel-metal-hydride (NiMH) batter-

u PDAs and Handheld computers

ies using external termination.

u Handheld meters

u Charging stations

u Digital cameras

Typical Application Circuit

14

13

3

7

4

8

6

5

11

C H AR G ER VIN

VC C

IPR G M

EN

ITER M

BIP

C P

10

STAT

9

O V P

2

VPR G M

1

BSEN

16

VO U T

15

G N D

N C

VO U T

12

C H AR G ER

PR ESEN T

N C

F AU LT

STATU S

C 1

R 1

R 2

SC 801

1uF

C 2

2.2uF

BATTER Y

2.8

1.5

R₁

1.5

R₂

Pre-ChargeCurrent =

• 88 Fast -Charge Current =

• 1000 Termination Current =

• 88

R₂

Revision 3, April 2003

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SC801

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

Units

VCC, EN to GND

-0.3 to 14.0

-0.3 to +6.0

2.5

V

VOUT, VPRGM, IPRGM, CP, OVP, STAT, ITERM, BIP to GND

Power Dissipation

P_D

W

MLP (Derate 20mW/ °C above 85 °C)

VOUT short to GND

Continuous

Thermal Resistance, Junction to Ambient

Operating Junction Temperature

Lead Temperature

50

150

°C/W *

°C

θ_JA

T_J

T_LEAD

T_STG

ESD

235

°C

Storage Temperature (Soldering) 10 seconds

-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

T_A

Units

(-40°C to +85°C)

Min

Max

Min

4.2

Max

14

Input Voltage

VCC

V_OP

I_CC

V

Operating Voltage

Operating Current

6.5

2

Charging Mode

OVP, STATUS, CP = 0µA

mA

LDO Mode

OVP, STATUS, CP = 0µA

25

1

Battery Leakage Current

Regulated Voltage

I_VOUT

V_BAT

VCC = 0V

0.1

µA

V

V_PRGM= Logic High

V_PRGM= Logic Low

4.20

4.10

4.16

4.06

4.24

4.14

Adjust Mode Feedback

Voltage

V_PRGM= External Divider

V_CC= 4.2V - 6.5V

3.0

82

45

2.97

3.03

V

Battery Pre-Charge Current

Battery Termination Current

Battery Fast-Charge Current

P_CI

I_TERM

F_CI

72

92

I_TERMResistor R = 3.01k

V_BATTERY> 2.5V

mA

38

52

I_PRGM= 3.01k

500

800

450

750

550

850

I_PRGM= 1.87k

V_BATTERY= 3.8V

Dropout Voltage = 550mV

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SC801

POWER MANAGEMENT

Electrical Characteristics Cont.

Unless otherwise noted: VCC = 4.75V - 5.25V

Parameter

Symbol

Conditions

25°C

T_A

(-40°C to

+85°C)

Units

Min Typ Max Min

Max

Battery Fast-Charge

Current Limit

2.8V < V_BATTERY< V_BAT

Dropout voltage = 1V

1.5**

A

I_PROGRegulated Voltage

1.5

4.2

90

1.4

1.6

4.3

V

V_INUVLO Rising Threshold

Adjust Mode Threshold

Voltage

mV

V_BATPrecharge Threshold

V_BATRecharge Threshold

V_INOVP Rising Threshold

V_INOVP Falling Threshold

V_INOVP Hysteresis

2.8

200

6.8

6.5

300

165

10

2.7

170

6.525

6.2

2.9

220

7.1

V

mV

V

V_BAT- V_BATTERY

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

mA

µA

No Adaptor or LDO mode,

High Impedance

OVP Output Source Current

CP Output Source Current

VCC > OVP

10

mA

µA

VCC > UVLO

BSENSE Input Leakage

Current

0.1

1

STAT, OVP, CP Outputs

V_OH

Load = 10mA

Load = 1mA

2.4

2.6

V

V_OL

V_IH

V_IL

Load = -500µA

0.25

0.4

V

EN, BIP, VPRGM Inputs

** Thermally Limited

1.8

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SC801

POWER MANAGEMENT

Pin Configuration

Ordering Information

VOUT VOUT VCC VCC

DEVICE⁽¹⁾

SC801IMLTR

SC801IMLTRT⁽²⁾

SC801EVB⁽³⁾

PACKAGE

MLP16

16

15

14

13

NC

12

11

10

9

BSEN

VPRGM

IPRGM

1

2

3

4

TOP VIEW

Evaluation Board

CP

Notes:

STAT

(1) Only available in tape and reel packaging. A reel con-

tains 3,000 devices.

OVP

ITERM

(2) TRT extension designates the lead-free leadframe

package option.

5

6

7

8

(3) Specify the desired IC part number when ordering.

NC

GND

EN

BIP

MLP16: 4X4 16 LEAD

Pin Descriptions

Pin #

Pin Name

Pin Function

1

BSEN

Battery voltage sense pin. Connect to battery terminal to Kelvin sense battery voltage. Do not

leave this pin floating.

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.

4

ITERM

Selection for current termination and pre-charge current. Requires a resistor to ground to

program pre-charge and termination current.

5

6

7

8

NC

GND

EN

No Connect

Ground

Device enable/disable pin. Logic high enables device. Logic low disables device.

BIP

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.

9

OVP

Overvoltage fault flag if charger input voltage is higher than 6.5V This pin can Source 10mA.

10

STAT

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.

11

CP

Charger present indicator, logic high when there is power to the VCC pins regardless of the

Enable pin state. This pin can source 10mA.

12

13

14

15

16

NC

No Connect

VCC

VOUT

Supply pin, connect to adaptor power.

Charger output, connect to battery.

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SC801

POWER MANAGEMENT

Block Diagram

VCC

13,14

Fast Charge

Enable

EN

7

UV

OV

Control

Charge

Pump

OVP

9

1.2V

4.2V

+

-

100

1

0.1

Reference

and OT SD

GND

6

4.1V

15,16 VOUT

EN

3.0V

Vout

-

STAT

CP

10

11

Status

+

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

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SC801

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 SC801 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

SC801 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 SC801 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 SC801 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

R

TERM

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 SC801 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

R

PRGM

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

R

PRGM

mination current set by the termination resistor on the There are three LED drivers on the SC801: OVP (Over

ITERM pin, the SC801 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 table above

defines each LED output.

1.5

ITERM=

• 88

R

TERM

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SC801

POWER MANAGEMENT

Applications Information (Cont.)

C 1

330pF

R 4

HIGH

R 3

LED FLAG

ON

OFF

IMPEDANCE

100K

59K

+5V

14

13

3

7

4

8

6

5

11

10

9

2

1

16

15

12

VC C

IPR GM

EN

ITER M

BIP

C P

STAT

OVP

VPR GM

BSEN

VOU T

N C

POWER TO VCC

PINS

NO POWER TO

VCC PINS

X

CP

GN D

N C

C H AR G ER

VCC OVER-

VOLTAGE

VCC VOLTAGE

NORMAL

C 2

1uF

R 1

R 2

SC 801

F AU LT

STATU S

PR ESEN T

X

OVP

C 3

2.2uF

BATTER Y

BATTERY

BATTERY FULLY

CHARGED

LDO MODE

STAT

CHARGING

R4

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.

R3

FIGURE 1

Remote Kelvin Sensing at the Battery

Another nice feature of the SC801 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.

The OVP LED will light whenever the SC801 is enabled

and there is an overvoltage on the VCC pins. When this

occurs the SC801 will turn off and stay off as long as the

overvoltage condition remains. As soon as the overvolt-

age is removed the SC801 will resume operation. The

OVP LED will not light if the part is disabled, even though

an overvoltage is present on the VCC pins.

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 SC801. The

SC801 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 165^oC.

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SC801

POWER MANAGEMENT

Applications Information (Cont.)

selection of an adjustable 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 demon-

stration platform to exemplify the SC801 operation. Other

components on the eval board consist of Semtechs

SD12 and SD05 ESD clamp diodes which should be part

of any system requiring ESD protection. LEDs 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 SC801 With a Charge Controller IC

The SC801 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

SC801. The best method of interfacing the SC801 with

such a device is to place the SC801 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 SC801 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 SC801 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

SC801 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 SC801 and the SC801M. 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 SC801. 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 SC801 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 SC801) and you want to set the output voltage to

4.2V you should remove any jumper on JP1 and manu-

ally 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 in-

serted when an adjustable voltage is required, with the

addition of R1, R2 & C2. For more information about

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SC801

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 SC801 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.

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SC801

POWER MANAGEMENT

Evaluation Board Schematic

J 1

1

3

5

7

9

11

13

15

2

4

6

8

10

12

14

16

+

C ON 16AP

TP1

+5VIN

TP2

G N D

J P1

4.2V

J P2

1

2

1

2

TP3

ISEN SE

Adjus table Vout

+

D 1

SD 12

C 1

10uF /25V

J P4

BIAS

J P3

4.1V

R 1

O PEN

TP4

VO U T

TP5

G N D

J P5

C H G R

J P6

EN ABLE

U 1

/

LD O

/

D ISABLE

C 3

0.1uF

/

VC H G

14

13

3

7

4

8

6

5

12

2

10

9

1

16

15

11

C 2

O PEN

R 2

J P7

VC C

IPR GM

EN

ITER M

BIP

N C

O PEN Li-Ion

VPR GM

STAT

O VP

BSEN

VO U T

C P

G N D

N C

R 3

10K

R 4

1M

R 5

1.24K

R 6

3.01K

D 2

SD 05

SC 801

D 3

C P

D 4

F AU LT

D 5

STATU S

C 4

2.2uF

J P8

1

2

R 7

619

SC 801/SC 801M

MINIMUM PARTS REQUIREMENT WITHIN DOTTED LINE

Evaluation Board Gerber Plots

Top Gerber

Bottom Gerber

Silk Screen Gerber

Inner Gerber

2002 Semtech Corp.

10

www.semtech.com

SC801

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

I_LIMIT

Iout

I_LIMIT

Soft Start

Precharge

Limit

1ms

CP

OVP

Stat

High Z

EN

2002 Semtech Corp.

11

www.semtech.com

SC801

POWER MANAGEMENT

Charge Mode Timing Diagram

Charge Mode

4.2V

Vcc

BIP

4.0V

4.2V

Vout

4ms

1ms

2.8V

precharge

Icharge

1ms

Iout

4ms

Soft Start

Termination

Current

Precharge

Limit

End of Charge

CP

OVP

Stat

Monitor

Mode

EN

2002 Semtech Corp.

12

www.semtech.com

SC801

POWER MANAGEMENT

State Diagram

Vin > UVLO

Shutdown Mode

Vout/Iout off

Over Voltage, Under

CP,STAT,OVP Low

Voltage, or Over

Temperature will

force the SC801 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=280/Rterm

VBAT > 2.8V

VOUT=CV

Yes

Soft Start

Fast Charge Mode

Iou t > 1500/Rprog

Yes

VBAT>2.8V

Yes

Iout=1500/Rprog

LDO Current Limit

VOUT=CV

Iou t = 1500/Rprog

Yes

Start CV Mode

VOUT=CV ?

Yes

IOUT < ITERM

Yes

Monitor Mode

STAT=Low

Vout off

VBAT = CV-200mv

Yes

2002 Semtech Corp.

13

www.semtech.com

SC801

POWER MANAGEMENT

Typical Characteristics

Charge Mode Bias Current vs Input Voltage

LDO Mode Bias Current vs Input Voltage

16

14

12

10

8

2

1.75

1.5

1.25

1

6

4

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)

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 Re s istance (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)

2002 Semtech Corp.

14

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SC801

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)

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

2002 Semtech Corp.

15

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SC801

POWER MANAGEMENT

Outline Drawing - MLP (16 pin)

Marking Information

Top Mark

yy = two-digit year of manufacture

ww = two-digit week of manufacture

2002 Semtech Corp.

16

www.semtech.com

SC801

POWER MANAGEMENT

Land Pattern MLP-16 pin (Standard Lead)

C

DIMENSIONS

DIM

C

INCHES

0.0880

0.0090

0.0085

0.0170

0.0290

0.1620

MM

E

2.2352

0.2286

0.2159

0.4318

0.7366

4.1148

E

C

Z

S

X

Y

X

Y

S

Z

Land Pattern MLP-16 pin (Extended Lead)

C

DIMENSIONS

DIM

C

INCHES

0.0880

0.0090

0.0085

0.0170

0.0390

0.1820

MM

E

2.2352

0.2286

0.2159

0.4318

0.9906

4.6228

E

C

Z

S

X

Y

X

Y

Z

S

Z

Contact Information

Semtech Corporation

Power Management Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: (805)498-2111 FAX (805)498-3804

2002 Semtech Corp.

17

www.semtech.com

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