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SC1409 PDF даташит

Спецификация SC1409 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «1 A Synchronous Switching Regulator».

Детали детали

Номер произв SC1409
Описание 1 A Synchronous Switching Regulator
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1409 Даташит, Описание, Даташиты
1 A Synchronous Switching Regulator SC1409
June 28, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1409 is a versatile, voltage-mode switching
regulator designed for use in battery operated power
supply applications. A simple, fixed-voltage buck regu-
lator can be implemented using the SC1409 with a
minimum of external components. Internal MOSFETs
and control circuitry minimize board space and design
time. The small device footprint allows for compact
circuit design.
SC1409 features include a temperature compensated
voltage reference, triangle wave oscillator, hiccup
mode current limit, an internally compensated error
amplifier, overcurrent temperature protection, soft
start, and under voltage lock out.
The SC1409 operates at a selectable, fixed frequency
of 300kHz or 500kHz, or can be synchronized to an
external clock within this range, providing an optimum
compromise between efficiency, external component
size, and cost.
FEATURES
= Internal MOSFETs
= Excellent efficiency >88%
= 1% Voltage accuracy
= Built-in over current protection
= 1A Output current
= 5µA Standby current
= Industrial temperature range
= 300kHz/500kHz selectable frequency
APPLICATIONS
= Handheld equipment
= PDA power supplies
= Notebook I/O power supplies
= Peripheral card supplies
= High density DC/DC conversion
ORDERING INFORMATION
DEVICE(1)
PACKAGE
SC1409ISTR
SO-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
APPLICATION CIRCUIT
Vin=5V
Vout R3 R4
3.45V 1.87k 1.00k
3.30V 1.74k 1.00k
3.10V 1.58k 1.00k
2.90V 1.40k 1.00k
2.80V 1.33k 1.00k
2.50V 1.07k 1.00k
1.50V 249 1.00k
+
C1
47uF/16V
C3
0.033uF
R1
OPEN
U1
1 SYNC/FSET ISET 8
2 EN/SS
VIN 7
3 AGND
PHASE 6
4 FB
PGND 5
SC1409IS
C6
0.1uF
L1 100uH
R2
R4
Vout
+
C2
47uF/16V
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1409 Даташит, Описание, Даташиты
1 A Synchronous Switching Regulator SC1409
June 28, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Ground Differential
Input Voltage
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature
Lead Temperature (Soldering) 10 seconds
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
ESD Rating (Human Body Model)
Symbol
VCC
PGND to GND
VIN
TA
TJ
TSTG
TL
θ=JA
θ=JC
ESD
Maximum
-0.3 to +7
±1
-0.3 to +7
-40 to +85
-40 to +125
-60 to +150
300
165
40
2
ELECTRICAL CHARACTERISTICS
Unless specified; TA = 25°C, VIN = 5V, VO = 1.8V. Output current = 1A. Per typical application circuit.
Values in bold apply over full operating temperature range.
Parameter
Reference
Symbol
VREF
Conditions
Feedback Bias Current
Quiescent Current
Shutdown Quiescent Current
IFB
IQ
IQ
Current into VCC pin
Io=0mA
Enable = 0V
Min
1.191
1.179
Typ
1.203
10.0
2.0
5.0
Regulation Load
Regulation Line
Oscillator Frequency
REGLOAD
IO = 100mA to 1A
0.5
REGLINE
OSC
FSET=Vin
FSET=GND
425 500
255 300
Max Duty Cycle
Output Current Limit
Soft start charging current
δmax
IO
90 95
1.5
32
EN/SS Shutdown Threshold
UVLO Trip point
Vin Increasing
Vin decreasing
4.5
4.1
RDS(ON)
RDS(ON)
Top side PFET
250
Bottom side NFET
175
Max
1.215
1.227
50.0
4.0
15
10
1.0
0.5
575
345
1.0
375
525
250
350
Units
V
V
V
°C
°C
°C
°C
°C/W
°C/W
kV
Units
V
nA
mA
uA
%
%
kHz
kHz
%
A
uA
V
V
V
m
m
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1409 Даташит, Описание, Даташиты
June 28, 2000
BLOCK DIAGRAM
1 A Synchronous Switching Regulator SC1409
EN/SS
OC_DET
I
UV LOCKOUT
2I
4.5V
-
+
-
+
1.5V
AGND
SYNC/FSET
FB
THERMAL
SHUTDOWN
OSCILLATOR
VREF
SOFT
START
ERROR
AMP
+
-
-
+
S
Q
R
S
Q
R
R
Q
S
R
Q
S
1:800
VIN
ISET
SHOOT THRU
CONTROL
+
-
PHASE
60nS DELAY
PGND
PIN CONFIGURATION
Top View
SYNC/FSET
EN/SS
AGND
FB
1
2
3
4
8 ISET
7 VIN
6 PHASE
5 PGND
(8 LEAD SOIC)
PIN DESCRIPTION
Pin # Pin Name
Pin Function
1 SYNC/FSET Sets frequency, allows synchronization.
FSET = VIN, f = 500kHz
FSET = GND, f = 300kHz
2
EN/SS
Enable and Soft Start pin.
3
AGND
Analog ground.
4 FB Output voltage feedback.
5
PGND
Device power ground.
6
PHASE
Power output to the inductor.
7 VIN Input voltage.
8
ISET
Current limit programming input.
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320










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