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Management IC. SC908 Datasheet

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Management IC. SC908 Datasheet






SC908 IC. Datasheet pdf. Equivalent




SC908 IC. Datasheet pdf. Equivalent





Part

SC908

Description

Power Management IC



Feature


SC908 Power Management IC for www.DataSh eet4U.com Single-Cell Li-Ion Devices PO WER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ „ Description The SC908 is a complete power manageme nt system designed for use in Bluetooth wireless headsets, portable media play ers, and other battery-powered electron ics where size is critical. Included ar e a full featured standalone Li-.
Manufacture

Semtech

Datasheet
Download SC908 Datasheet


Semtech SC908

SC908; Ion battery charger with a programmable low-battery monitor, a low noise LDO re gulator, and a DCDC buck converter. Bat tery charging features include programm able precharge, fast-charge, and termin ation current settings. Charge terminat ion is controlled by a programmable tim er and by a resistor that sets the term ination current. The 28V max input volt age protects again.


Semtech SC908

st hotplug overshoot and faulty adapters without additional protection circuitr y. The battery voltage Kelvin sense inp ut eliminates errors due to high chargi ng currents. A battery thermistor inter face disables charging when the battery temperature exceeds safe-to-charge lim its. The step-down switching regulator (buck converter) improves system effici ency and extends b.


Semtech SC908

attery life. The LDO regulator can be po wered directly from the battery or from the buck converter output when efficie ncy is critical. The fast-starting low noise LDO regulator is suitable for aud io, RF, or general purpose regulation r equired by peripheral devices, such as a vibrating alert motor. The low batter y detector warns when the battery level is below 3.3V, an.

Part

SC908

Description

Power Management IC



Feature


SC908 Power Management IC for www.DataSh eet4U.com Single-Cell Li-Ion Devices PO WER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ „ Description The SC908 is a complete power manageme nt system designed for use in Bluetooth wireless headsets, portable media play ers, and other battery-powered electron ics where size is critical. Included ar e a full featured standalone Li-.
Manufacture

Semtech

Datasheet
Download SC908 Datasheet




 SC908
SC908
POWER MANAGEMENT
Power Manawgwwe.DmataeShneett4UI.cComfor
Single-Cell Li-Ion Devices
Features
„ Single Cell Li-Ion battery charger — CC/CV charging
with current soft start
„ Charger regulated output voltage — 4.2V ±1% over
temperature with Kelvin sense of battery voltage
„ Charger input protection withstands 28V indefinitely
„ Charger max constant current setting — 500mA
„ Adjustable charge termination current down to
10mA
„ Battery NTC interface disables charging if battery
temperature out of range
„ Programmable low battery detector threshold
„ Four status indicators
„ Programmable charge completion timer
„ Buck converter with enable — output programmable
from 1V to 3V, 150mA max output
„ Buck converter efficiency — 88% at 50mA
„ General purpose low noise LDO regulator with fast
enable, active shutdown
„ 4x4x0.9 (mm) MLPQ package
„ WEEE and RoHS compliant
Applications
„ Bluetooth headsets
„ MP3 players
„ Low cost mobile phones
Typical Application Circuit
Description
The SC908 is a complete power management system
designed for use in Bluetooth wireless headsets, portable
media players, and other battery-powered electronics
where size is critical. Included are a full featured stand-
alone Li-Ion battery charger with a programmable
low-battery monitor, a low noise LDO regulator, and a DC-
DC buck converter.
Battery charging features include programmable pre-
charge, fast-charge, and termination current settings.
Charge termination is controlled by a programmable
timer and by a resistor that sets the termination current.
The 28V max input voltage protects against hotplug over-
shoot and faulty adapters without additional protection
circuitry. The battery voltage Kelvin sense input elimi-
nates errors due to high charging currents. A battery
thermistor interface disables charging when the battery
temperature exceeds safe-to-charge limits.
The step-down switching regulator (buck converter)
improves system efficiency and extends battery life. The
LDO regulator can be powered directly from the battery
or from the buck converter output when efficiency is criti-
cal. The fast-starting low noise LDO regulator is suitable
for audio, RF, or general purpose regulation required by
peripheral devices, such as a vibrating alert motor. The
low battery detector warns when the battery level is
below 3.3V, and when the battery has discharged below
a lower programmable voltage limit.
Charging Adapter
CVAD
Charging
Charger
Present
RRLBAT
CVREF
RNPU
CVSYS
RNTC (Battery
Pack NTC
Thermistor)
VAD
VSYS
BAT
BSEN
RTIME
ITERM
IPRGM
EN_NTC
LEN
SC908 LVIN
LVOUT
CHRGB
CPB
FLTB
LFB
SEN
SLX
LBATB
RLBAT
VREF
AGND
SFB
DGND
PGND
RRTIME
RITERM
RIPRGM
LS
CSFB
RS1
CSFG
RS2
January 24, 2008
© 2008 Semtech Corporation
CBAT
Li-Ion
BATTERY
CLVIN
Can supply LDO
from battery or from
DC-DC converter
To Audio Circuits
or vibrator motor
SVOUT,
To Bluetooth
Processor
CSVOUT
RL1
CLVOUT
RL2
US Patent: 6,836,095
1




 SC908
Pin Configuration
24 23 22 21 20 19
VAD 1
18 SEN
VSYS 2
IPRGM 3
TOP VIEW
17 CPB
16 LBATB
ITERM 4
15 FLTB
RTIME 5
RLBAT 6
14 SFB
T
13 LEN
7 8 9 10 11 12
SC908
www.DataSheet4U.com
Ordering Information
Device
Package
SC908MLTRT(1,2)
MLPQ-24
SC908EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package only. Device is WEEE and RoHS compliant.
MLP-24; 4x4, 24 LEAD
θ = 29°C/W
JA
Marking Information
SC908
yyww
xxxxx
xxxxx
yy = year of manufacture
ww = week of manufacture
xxxx = lot number
2




 SC908
SC908
www.DataSheet4U.com
Absolute Maximum Ratings(1)
Recommended Operating Conditions
VAD (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +28.0 Ambient Temperature Range (°C) . . . . . . . . . . . . . -40 to +85
BAT, VSYS, CHRGB, FLTB, LBATB (V) . . . . . . . . . . -0.3 to +5.5 Charger Input Voltage Range (V) . . . . . . . . . . . . 4.45 to 7.05
CPB
(V)
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
-0.3
to
V (2)
SRC
+
0.3
SLX, LVIN, LEN, SEN (V) . . . . . . . . . . . . . . . . . . . . . . . VBAT + 0.3
LVOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V + 0.3
LVIN
AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3
LDO Regulator Input Voltage Range (V) . . . . . . . . 2.2 to VBAT
Switching Regulator Input Voltage (V) . . . . . . . . . . . . . . . VBAT
PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0 to +0.3
Pin Voltage — All Other Pins (V) . . . . . . . . . . . . -0.3 to +6.5
BAT Output Current (A). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BAT Short Circuit Duration (s) . . . . . . . . . . . . . . . .Continuous
DC-DC Converter Output Current (mA)(3) . . . . . . -265, +180
DC-DC Converter Output Current (mA)(4) . . . . . . . . . . . ±600
Thermal Information
Thermal Resistance, Junction to Ambient (°C/W)(6) . . . . . 29
Junction Temperature Range (°C) . . . . . . . . . . . . .-40 to +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
IR Reflow Temperature (°C) . . . . . . . . . . . . . . . . . . . . . . . . +260
Total Power Dissipation (W) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ESD Protection Level (kV) (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) All absolute maximum ratings are with respect to DGND unless otherwise noted.
(2) V = larger of V and V
SRC BAT VSYS
(3) Continuous
(4) Peak
(5) Tested according to JEDEC standard JESD22-A114-B.
(6) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Test Conditions: V = 4.75V to 5.25 V; V = 3.7V; V = V ; Typ values at 25°C; Min and Max at -40°C < T < 85°C, unless specified.
VAD BAT LEN VAD
A
Parameter
Symbol
Conditions
Min Typ Max Units
Charger
VAD Input Voltage
Battery Leakage Current (2)
VAD (1)
OP
VAD
UVLO-R
VAD
UVLO-F
VADUVLO-H
VAD
OVP-R
VAD
OVP-F
VAD
OVP-H
lleak
BAT
Operating Voltage
UVLO Rising Threshold
UVLO Falling Threshold
UVLO Hysteresis
(VAD - VAD )
UVLO-R
UVLO-F
OVP Rising Threshold
OVP Falling Threshold
OVP Hysteresis
(VAD - VAD )
OVP-R
OVP-F
V =V =V =0V, V =4.2V
VAD SEN LEN
BAT
4.45 5 7.05
4.05 4.25 4.45
3.8 4 4.2
150
7.5 7.80
7.05 7.3
50
0.1 2
V
V
V
mV
V
V
mV
μA
3






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