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PDF SC908 Data sheet ( Hoja de datos )
| Número de pieza | SC908 | |
| Descripción | Power Management IC | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC908 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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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
1 page  
SC908
Electrical Characteristics (continued)
Parameter
Symbol
Core Functions (Excluding Charger)
Core Circuits Quiescent
Current (4)
I
Q-Core
VREF Reference Voltage
V
VREF
VREF Power Supply Rejection
PSRR
REF
VREF Reference Voltage Start-Up
Time (5, 10)
t
SU_REF
DC-DC Buck Converter
Buck Converter Input Voltage
Buck Converter Under-Voltage
Lockout Rising Threshold
Buck Converter Under-Voltage
Lockout Falling Threshold
Buck Converter Under-Voltage
Lockout Hysteresis
Buck Converter Quiescent
Current (2)
Buck Converter Minimum
On-Time
Buck Converter Maximum
Duty Cycle (10)
Buck Converter Program Output
Voltage Minimum (6,10)
Buck Converter Program Output
Voltage Maximum(6,7,8,10)
Buck Converter Feedback
Regulation Voltage
V
SVIN
VT
SUVLO-R
VT
SUVLO-F
VT
SUVLO-HYS
I
BAT-Q
t
SON_MIN
SDC
MAX
V
SVOUT_MIN
V
SVOUT_MAX
V
SFB
Buck Converter Output Voltage(6)
V
SVOUT
Buck Converter
Line Regulation(6)
Buck Converter
Load Regulation (6)
V
SVOUT_LINE
V
SVOUT_LOAD
Conditions
V = V = 0V,
VAD SEN
V = V = 4.2V
LEN BAT
V = 3.7V with 0.5V ripple,
BAT P-to-P
f ≤ 10kHz, C = 10nF
VREF
Delay from first of SEN high
LEN high, V = 3.7V
BAT
C = 10nF
VREF
VREF from 0V to 95% of final
BAT pin is also the switching regulator
supply input
V = V , I = 10mA
SEN BAT SVOUT
Low I mode of P
Q SAVE
V ≥V
/SDC +150mV
BAT SVOUT_MAX
MAX
V = 3.7V, L = 4.7μH
BAT
ISVOUT = 100mA
R = 340kΩ, R = 100kΩ
S1 S2
2.8V ≤ V ≤ 4.5V
BAT
I = 100mA
SVOUT
R = 340kΩ, R = 100kΩ
S1 S2
5mA ≤ I ≤ 150mA
SVOUT
V = 3.7V
BAT
R = 340kΩ, R = 100kΩ
S1 S2
Min
2.55
92
3
0.480
-0.3
www.DataSheet4U.com
Typ Max Units
100 μA
0.75 V
70 dB
0.4 ms
V
BAT
2.8
84
115
60
1
0.500
0.520
V
V
V
mV
μA
ns
%
V
V
V
2.2 V
0.3 %/V
0.002
%/mA
5
5 Page 
LDO Line Regulation
RL1 = 54.9kΩ, RL2 = 39.2kΩ, TA = 25οC
1.799
ILVOUT = 10mA
1.798
ILVOUT = 100mA
ILVOUT = 50mA
1.797
1.796
ILVOUT = 150mA
1.795
2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2
VLVIN (V)
LDO Temperature Regulation
RL1 = 54.9kΩ, RL2 = 39.2kΩ, VLVIN = 3.75V
1.8
1.795
ILVOUT = 10mA
ILVOUT = 50mA
1.79
ILVOUT = 100mA
1.785
ILVOUT = 150mA
1.78
1.775
1.77
-40
-20
0 20 40 60 80
Junction Temperature (oC)
100 120
LDO PSRR, BAT to LVOUT
TA = 25οC, VLVOUT = 1.8V, VLVIN = 3.7VDC, VBAT = 3.7VDC + 0.5VAC
-45
-50
-55
-60
-65
-70
-75
-80
-85
10
100
1000
10000
Frequency (Hz)
SC908
www.DataSheet4U.com
1.799
LDO Load Regulation
RL1 = 54.9kΩ, RL2 = 39.2kΩ, TA = 25οC, VLVIN = 3.75V
1.7985
1.798
1.7975
1.797
0
20 40 60 80 100 120 140
ILVOUT (mA)
LDO PSRR, LVIN to LVOUT
TA = 25οC, VLVOUT = 1.8V, VLVIN = 3.7VDC + 0.5VAC, VBAT = 3.7V
-45
-50
-55
-60
-65
-70
-75
-80
-85
10
100
1000
10000
Frequency (Hz)
LDO PSRR, LVIN and BAT to LVOUT
TA = 25οC, VLVOUT = 1.8V, VLVIN = VBAT = 3.7VDC + 0.5VAC
-45
-50
-55
-60
-65
-70
-75
-80
-85
10
100
1000
10000
Frequency (Hz)
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SC908.PDF ] | |
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