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Buck Converter. SC198A Datasheet

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Buck Converter. SC198A Datasheet






SC198A Converter. Datasheet pdf. Equivalent




SC198A Converter. Datasheet pdf. Equivalent





Part

SC198A

Description

Dual DC-DC Buck Converter



Feature


SC198A Dual DC-DC Buck Converter www.Dat aSheet4U.com with High Current Capabili ty POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ Description The SC198A is a dual high-efficiency synch ronous buck converter designed for use in low power applications. Each convert er is capable of supplying up to 800mA of average current at one of eight prog rammable output voltages used.
Manufacture

Semtech

Datasheet
Download SC198A Datasheet


Semtech SC198A

SC198A; as microprocessor supply voltages. The SC198A uses a single control logic bloc k for the two converters, but their con trols can be set independently. The dev ice uses a flexible clocking method all owing the user to set the fixed interna l 1MHz oscillator or synchronize the cl ock to an external source. The device a lso has an optional power-save mode tha t optimizes effici.


Semtech SC198A

ency for light loads. The SC198A provide s output voltage flexibility while cons erving board space by using control pin s to select the output voltage. This el iminates at least four parts from the t raditional dual buck converter bill of materials. Input voltage range — 2.7 V to 5.5V Dual buck converters with ind ependent control High efficiency — ov er 90% peak Up to 800m.


Semtech SC198A

A Load Programmable output voltages per channel — 8 Fixed-frequency operation — 1MHz Optional SYNC clock input Opt ional power-save under light-load condi tions Shutdown current <1μA Soft-start to limit in-rush current 4mm x 4mm MLP Q package Applications „ „ „ „ „ „ „ „ Mobile phones Cordless phones MP3 players Digital cameras PDAs Singl e Li-Ion cell or (3) NiMH/NiCd .

Part

SC198A

Description

Dual DC-DC Buck Converter



Feature


SC198A Dual DC-DC Buck Converter www.Dat aSheet4U.com with High Current Capabili ty POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ Description The SC198A is a dual high-efficiency synch ronous buck converter designed for use in low power applications. Each convert er is capable of supplying up to 800mA of average current at one of eight prog rammable output voltages used.
Manufacture

Semtech

Datasheet
Download SC198A Datasheet




 SC198A
POWER MANAGEMENT
Features
„ Input voltage range — 2.7V to 5.5V
„ Dual buck converters with independent control
„ High efficiency — over 90% peak
„ Up to 800mA Load
„ Programmable output voltages per channel — 8
„ Fixed-frequency operation — 1MHz
„ Optional SYNC clock input
„ Optional power-save under light-load conditions
„ Shutdown current <1μA
„ Soft-start to limit in-rush current
„ 4mm x 4mm MLPQ package
Applications
„ Mobile phones
„ Cordless phones
„ MP3 players
„ Digital cameras
„ PDAs
„ Single Li-Ion cell or (3) NiMH/NiCd cell devices
„ Digital multimedia broadcast (DMB) devices
„ Portable gaming systems
Typical Application Circuit
SC198A
Dual DC-DC Bwuwcw.kDatCaSohenet4vU.ecormter
with High Current Capability
Description
The SC198A is a dual high-efficiency synchronous buck
converter designed for use in low power applications.
Each converter is capable of supplying up to 800mA of
average current at one of eight programmable output
voltages used as microprocessor supply voltages.
The SC198A uses a single control logic block for the two
converters, but their controls can be set independently.
The device uses a flexible clocking method allowing the
user to set the fixed internal 1MHz oscillator or synchro-
nize the clock to an external source. The device also has an
optional power-save mode that optimizes efficiency for
light loads.
The SC198A provides output voltage flexibility while con-
serving board space by using control pins to select the
output voltage. This eliminates at least four parts from the
traditional dual buck converter bill of materials.
VBATT
VINA SC198A
4.7μH
LXA
VINR
VOUTA
VINB
GNDA
CIN ENA
CTLA0
VOUTA
COUTA
CTLA1
CTLA2
4.7μH
LXB
VOUTB
ENB
CTLB0
VOUTB
GNDB
COUTB
CTLB1
CTLB2
GNDR
MODE/SYNC
September 26, 2007
1




 SC198A
Pin Configuration
VINA
LXA
GNDA
VOUTA
CTLA0
20 19 18 17 16
1 15 VINB
2 TOP VIEW 14 LXB
3 13 GNDB
4 12 VOUTB
5 T 11 CTLB0
6 7 8 9 10
MLPQ: 4mm x 4mm 20 Lead
θJA = 31°C/W
SC198A
www.DataSheet4U.com
Ordering Information
Device
Package
SC198AMLTRT(1) (2)
SC198AEVB
MLPQ-20
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.
Marking Information
198A
yyww
xxxxx
xxxxx
yyww = Date Code
xxxx = Semtech Lot No.
xxxx = Semtech Lot No.
2




 SC198A
SC198A
www.DataSheet4U.com
Absolute Maximum Ratings
Recommended Operating Conditions
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +7
VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN +0.3
VLXA and VLXB (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-1 to VIN +1
Pin Voltage - All Other Pins (V) . . . . . . . . . -0.3 to (VIN + 0.3)
Output Short Circuit to GND Duration . . . . . Continuous
LXA and LXB Currents (A). . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ambient Temperature Range (°C) . . . . . . . . . . . . . -40 to +85
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7 to 5.5
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . 31
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
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) Tested according to JEDEC standard JESD22-A114-B.
(2) 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
Unless otherwise noted: V = 3.6V, V
= V , L = 4.7μH, C = 10μF, T = -40°C to +85°C. Typical values are at T = 25°C for both outputs.
IN
MODE/SYNC
IN
A
A
Parameter
Symbol
Conditions
Min Typ Max Units
Input Voltage Range
V Accuracy(1)
OUT
Line Regulation
Load Regulation
Minimum Duty Cycle
LXA, LXB Current Limit
Quiescent Current
Shutdown Current
LXA and LXB
Leakage Current
P-Channel On Resistance
V
IN
ΔV
OUT
ΔVLINE
ΔV
LOAD
DC
MIN
ILIM
IQ
I
SD
I ,I
LXA LXB
R
DSP
V = 1.8V
OUT
V = 3.3V
OUT
I
OUT
=
10mA
to
800mA
,
V
IN
0.7V
+
V
OUT
V = 2.7 to 5.5V, V = 1.8V, I = 300mA
IN OUT OUT
V = 4.0 to 5.5V, V = 3.3V, I = 300mA
IN OUT OUT
I = 10mA to 800mA, V = 1.8V
OUT OUT
I = 10mA to 800mA, V = 3.3V, V = 5.0V
OUT OUT IN
IOUT = 0mA, SYNC = 0, ENA, ENB = VIN
V , V = 0, LXA, LXB = Open
ENA ENB
V = 5.5V, V = 0V, PMOS
IN LX
V = 5.5V, V = V , NMOS
IN LX IN
I , I = 100mA
LXA LXB
2.7 5.5
V
4.0 5.5
-3 3 %
0.2 %/V
0.0008 %/mA
1.2
0.1
0.1
-2 0.1
0.35
18
50
1
1
%
A
μA
μA
μA
μA
Ω
3






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