OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

SC191AWLTRT

P1-P3P4-P6P7-P9P10-P12P13-P13
www.semtech.com
1
POWER MANAGEMENT
SC191
Low Supply Ripple Synchronous
Buck Conversion Regulator
April 12, 2006
Description
Features
Features
Typical Application Circuit
Applications
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 effi ciency.
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 fi xed 3.3V
and 5V fi xed input applications. The output is a fi 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 profi le (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
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
SC191
L
4.7H
C
IN
4.7F
VIN
VOUT
BP
GND
LX
PVIN
PGND
C
BP
4.7F
EN
V
OUT
C
OUT
4.7F
V
IN
1
5
8
6
3
4
2
7
Patent Pending
2
© 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC191
Absolute Maximum Ratings
Exceeding the specifi cations below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specifi ed in the
Electrical Characteristics section is not recommended.
Unless otherwise noted: V
IN
= 3.6V , V
EN
= V
IN
, T
A
= -40°C to 85°C . Typical values are at T
A
= 25°C.
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.
Electrical Characteristics
Absolute Maximum Ratings
Parameter Symbol Maximum Units
Input Voltage V
VIN
, V
PVIN
-0.3 to 7.0 V
Enable Input V
EN
-0.3 to 7.0 V
LX Voltage V
LX
-1 to V
BP
+ 1 (7V max) V
Output Voltage V
VOUT
-0.3 to 7.0 V
BP Voltage V
BP
0.3 to 7.0 V
Thermal Impedance Junction to Ambient
1
θ
JA
135 °C/W
V
OUT
Short Circuit to GND t
SC
Continuous s
Storage Temperature T
S
-60 to +160 °C
Junction Temperature T
JC
+150 °C
Peak IR Refl ow Temperature T
LEAD
260 °C
ESD Protection Level
2
V
ESD
2kV
Parameter Symbol Conditions Min Typ Max Units
Input Voltage Range V
IN
2.7 5.5 V
Input Voltage Ripple V
IN (P-P)
C
IN
= C
BP
= 10μF1mV
Line Regulation V
LINEREG
I
OUT
= 150mA -0.3 0.3 %/V
Load Regulation V
LOADREG
0mA < I
OUT
< 330mA 0.002 %/mA
P-Channel On Resistance R
DSP
I
LX
= 100mA 0.3 Ω
N-Channel On Resistance R
DSN
I
LX
= 100mA 0.2 Ω
Start-Up Time T
START
I
OUT
= 150mA 1.25 ms
Output Voltage Accuracy ΔV
OUT
I
OUT
= 150mA -3 3 %
I
OUT
= 150mA, T
A
= 25°C -1.5 1.5 %
Front End LDO (FELDO) V
BP
I
BP
= 110mA
(1)
300 325 mV
© 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
3
SC191
Electrical Characteristics (Cont.)
Note:
1) FELDO tested at I
BP
= 110mA. Equivalent to I
OUT
= 330mA at V
OUT
= 1.2V.
Parameter Symbol Conditions Min Typ Max Units
P-Channel Current Limit I
LIM(P)
550 730 940 mA
N-Channel Current Limit I
LIM(N)
-270 -420 -700 mA
Quiescent Current I
Q
Switching mode, I
OUT
= 100μA 2.5 mA
Shutdown Current I
SD
EN tied to GND 0.1 1 μA
LX Leakage Current PMOS I
LXP
V
IN
= 5.5V
LX, EN tied to GND
0.1 1 μA
LX Leakage Current NMOS I
LXN
V
IN
= V
LX
= 5.5V
EN tied to GND
-20 0.1 μA
Oscillator Frequency f
OSC
0.87 1.0 1.12 MHz
UVLO Threshold (Lower) V
UVLO
2.4 2.5 2.6 V
UVLO Hysteresis V
UVLO-HYS
50 mV
Thermal Shutdown T
SD
145 °C
Thermal Shutdown
Hysteresis
T
SD-HYS
10 °C
Logic Input High V
IH
EN pin 1.6 V
Logic Input Low V
IL
EN pin 0.6 V
Logic Input Current High I
IH
EN pin -2 0.1 2 μA
Logic Input Current Low I
IL
EN pin -2 0.1 2 μA
P1-P3P4-P6P7-P9P10-P12P13-P13

SC191AWLTRT

Mfr. #:
Buy SC191AWLTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators SYNCH BUCK CONVERTERS
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet