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Conversion Regulator. SC191 Datasheet

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Conversion Regulator. SC191 Datasheet






SC191 Regulator. Datasheet pdf. Equivalent




SC191 Regulator. Datasheet pdf. Equivalent





Part

SC191

Description

Low Supply Ripple Synchronous Buck Conversion Regulator

Manufacture

Semtech

Datasheet
Download SC191 Datasheet


Semtech SC191

SC191; Low Supply Ripple Synchronous www.DataSh eet4U.com Buck Conversion Regulator POW ER MANAGEMENT Description The SC191 is a synchronous step-down converter with integrated power devices and an integra ted front-end LDO regulator to minimize input supply ripple. If supply ripple is not a concern, the front-end LDO reg ulator can be bypassed externally to ma ximize efficiency. .


Semtech SC191

The internal MOSFET switches provide pea k current greater than 550mA to achieve a DC output of at least 330mA over the rated input voltage range, making the SC191 ideal for single-cell Li-ion batt ery applications as well as fixed 3.3V and 5V fixed input applications. The output is a fixed 1.2V - ideal for low -voltage microprocessors. Other voltage options are available (.


Semtech SC191

consult the factory for details). Additi onal features include internal soft-sta rt to limit inrush current, over-curren t protection, over-temperature protecti on, and over-voltage protection. The 1M Hz switching frequency allows the use o f small surface mount capacitors and in ductors, and no other external compensa tion components are needed. The device is available in a .



Part

SC191

Description

Low Supply Ripple Synchronous Buck Conversion Regulator

Manufacture

Semtech

Datasheet
Download SC191 Datasheet




 SC191
POWER MANAGEMENT
Description
SC191
Low Supply Ripple Synchronous
Buck Converwswiwo.DnataRSheeegt4Uu.cloamtor
Features
The SC191 is a synchronous step-down converter with
integrated power devices and an integrated front-end
LDO regulator to minimize input supply ripple. If supply
ripple is not a concern, the front-end LDO regulator can be
bypassed externally to maximize efciency.
The internal MOSFET switches provide peak current greater
than 550mA to achieve a DC output of at least 330mA over
the rated input voltage range, making the SC191 ideal for
single-cell Li-ion battery applications as well as xed 3.3V
and 5V xed input applications. The output is a xed 1.2V
- ideal for low-voltage microprocessors. Other voltage
options are available (consult the factory for details).
Additional features include internal soft-start to limit in-
rush current, over-current protection, over-temperature
protection, and over-voltage protection.
The 1MHz switching frequency allows the use of small
surface mount capacitors and inductors, and no other
external compensation components are needed. The
device is available in a low prole (0.8mm max height)
2.3mm x 2.3mm MLPD 8-lead package, minimizing area
without compromising performance.
‹ Less than 1mV Supply Ripple
‹ 2.7V to 5.5V Input Range
‹ 330mA Guaranteed Output Current
‹ Fixed Frequency 1MHz Operation
‹ No Schottky Diode Required
‹ Over-Current Protection
‹ Over-Voltage Protection
‹ Over-Temperature Protection
‹ Soft-Start
‹ No External Compensation Required
‹ MLPD-8, 2.3mm x 2.3mm Package
‹ WEEE and RoHS Compliant
Applications
‹ Cell Phones
‹ Cordless Phones
‹ Notebook and Subnotebook Computers
‹ PDAs and Mobile Communicators
‹ WLAN Peripherals
‹ Wireless Modules
‹ 1 Li-Ion or 3 NiMH/NiCd Powered Devices
Patent Pending
Typical Application Circuit
VIN
CIN
4.7μF
3 VIN SC191
4 EN
2 PVIN
7 PGND
8
LX
5
VOUT
BP
GND
1
6
L
4.7μH
CBP
4.7μF
COUT
4.7μF
VOUT
April 12, 2006
1 www.semtech.com





 SC191
SC191
POWER MANAGEMENT
www.DataSheet4U.com
Absolute Maximum Ratings
Exceeding the specications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specied in the
Electrical Characteristics section is not recommended.
Parameter
Symbol
Maximum
Units
Input Voltage
VVIN, VPVIN
-0.3 to 7.0
Enable Input
VEN -0.3 to 7.0
LX Voltage
VLX -1 to VBP + 1 (7V max)
Output Voltage
VVOUT
-0.3 to 7.0
BP Voltage
VBP 0.3 to 7.0
Thermal Impedance Junction to Ambient1
θJA
135
VOUT Short Circuit to GND
tSC Continuous
Storage Temperature
TS -60 to +160
Junction Temperature
TJC +150
Peak IR Reow Temperature
TLEAD
260
ESD Protection Level2
VESD
2
Notes:
1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad as per JESD51 standards.
2) Tested according to JEDEC standard JESD22-A114-B.
V
V
V
V
V
°C/W
s
°C
°C
°C
kV
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V , VEN = VIN , TA = -40°C to 85°C . Typical values are at TA = 25°C.
Parameter
Symbol
Conditions
Input Voltage Range
Input Voltage Ripple
Line Regulation
Load Regulation
P-Channel On Resistance
N-Channel On Resistance
Start-Up Time
Output Voltage Accuracy
Front End LDO (FELDO)
VIN
VIN (P-P)
VLINEREG
VLOADREG
RDSP
RDSN
TSTART
ΔVOUT
VBP
CIN = CBP = 10μF
IOUT = 150mA
0mA < IOUT < 330mA
ILX = 100mA
ILX = 100mA
IOUT = 150mA
IOUT = 150mA
IOUT = 150mA, TA = 25°C
IBP = 110mA(1)
Min Typ Max Units
2.7 5.5 V
1 mV
-0.3 0.3 %/V
0.002
%/mA
0.3 Ω
0.2 Ω
1.25 ms
-3 3 %
-1.5 1.5 %
300 325
mV
© 2006 Semtech Corp.
2
www.semtech.com





 SC191
SC191
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
P-Channel Current Limit
N-Channel Current Limit
Quiescent Current
Shutdown Current
LX Leakage Current PMOS
LX Leakage Current NMOS
Oscillator Frequency
UVLO Threshold (Lower)
UVLO Hysteresis
Thermal Shutdown
Thermal Shutdown
Hysteresis
Logic Input High
Logic Input Low
Logic Input Current High
Logic Input Current Low
ILIM(P)
ILIM(N)
IQ
ISD
ILXP
ILXN
fOSC
VUVLO
VUVLO-HYS
TSD
TSD-HYS
VIH
VIL
IIH
IIL
Switching mode, IOUT = 100μA
EN tied to GND
VIN = 5.5V
LX, EN tied to GND
VIN = VLX = 5.5V
EN tied to GND
EN pin
EN pin
EN pin
EN pin
Note:
1) FELDO tested at IBP = 110mA. Equivalent to IOUT = 330mA at VOUT= 1.2V.
Min
550
-270
-20
0.87
2.4
1.6
-2
-2
www.DataSheet4U.com
Typ
730
-420
2.5
0.1
0.1
0.1
1.0
2.5
50
145
10
0.1
0.1
Max
940
-700
1
1
1.12
2.6
0.6
2
2
Units
mA
mA
mA
μA
μA
μA
MHz
V
mV
°C
°C
V
V
μA
μA
© 2006 Semtech Corp.
3
www.semtech.com



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