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SC2422A Datasheet Preview

SC2422A Datasheet

BIPHASE CURRENT MODE CONTROLLER

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BIPHASE CURRENT MODE
CONTROLLER
SC2422A
PRELIMINARY - August 7, 2000
DESCRIPTION
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
The SC2422A biphase, current mode controller is de-
signed to work with Semtech smart synchronous
drivers, such as the SC1205, SC1305 or the SC1405 to
provide the DC/DC converter solution for the most
demanding Micro-processor applications. Input current
rather than output current sensing is used to guarantee
precision phase to phase current matching using a
single sense resistor on the input power line. Accurate
current sharing and pulse by pulse current limit are
implemented without the power loss and transient re-
sponse degradation associated with output current
sense methods. Two phase operation allows significant
reduction in input/output ripple while enhancing tran-
sient response.
The DAC step size and range are programmable with
external components thus allowing compliance with
new and emerging VID ranges.
A novel approach implements active droop, minimizing
output capacitor requirements during load transients.
This avoids the pitfalls of the passive droop implemen-
tation. This feature also allows easy implementation of
N+1 redundancy and current sharing among modules.
Programmable Under Voltage Lockout assures proper
start-up and shutdown by synchronizing the controller
to the driver supply. Wide PWM frequency range allows
use of low profile, surface mount components.
TYPICAL APPLICATION SCHEMATIC
Precision, pulse by pulse phase current match-
ing
Active drooping allows for best transient response
Input Sensing Current mode control
Programmable DAC step size/offset allows
Compliance with VRM9.0, VRM8.3 or VRM8.4
Externally programmable soft-start
5V or 12V input for next generation processors
0% minimum duty cycle improves transient re-
sponse
Externally Programmable UVLO with hysteresis
Cycle by cycle current limiting
Programmable Internal Oscillator to 1 MHz
VID IIIII Inhibit (No CPU)
APPLICATIONS
Intel Advanced Microprocessors
AMD AthlonTM power supplies
Servers/Workstations, high density power supplies
ORDERING INFORMATION
DEVICE(1)
SC2422ACS.TR
PACKAGE
SO-16
TEMP. RANGE (TJ)
0 - 125°C
SC2422A.EVB
Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 1000 devices.
INPUT
Rsens
VIN
Rf
Ri
1 VID4
2 VID3
3 VID2
4
VID1
5 VID0
6 ERROUT
7
FB
8 RREF
VCC 16
BGOUT 15
OC+ 14
13
OUT1
OUT2 12
OC- 11
10
UVLO
GND 9
Rref
SC2422A
© 2000 SEMTECH CORP.
1 IN
3
VCC
4
VDD
DRVH 7
6
PHASE
5
DRVL
SC1305
1 IN
3
VCC
4
VDD
DRVH 7
6
PHASE
5
DRVL
VIN
SC1305
Vout
1
652 MITCHELL ROAD NEWBURY PARK CA 91320




Semtech Corporation

SC2422A Datasheet Preview

SC2422A Datasheet

BIPHASE CURRENT MODE CONTROLLER

No Preview Available !

BIPHASE CURRENT MODE
CONTROLLER
SC2422A
PRELIMINARY - August 7, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Input DC Rail Voltage to GND
PGND to GND
Operating Temperature Range
Junction Temperature
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
Symbol
VIN
TA
TJ
θJC
θJA
TSTG
TLEAD
Maximum
15
+1
-20 to 125
0 to 125
20
60
-65 to +150
300
ELECTRICAL CHARACTERISTICS
Unless specified: VCC = +5V, TAMB = 25°C, RREF = 11.5k. See Typical Application Circuit
Parameter
Conditions
Min Typ
Chip_Supply
IC Supply Voltage
4.5 5
IC Supply Current
Reference Section
VCC = 5.0 ~ 12.0V
9
Bandgap Output
Source Impedance
CBG = 4.7nF
1.5
3
Supply Rejection
VID Step
Voltage Accuracy
Temperature Stability
Voltage Accuracy
Oscillator Section
Frequency Range
Frequency Accuracy
Temperature Stability
Voltage Error Amplifier
Input Offset Voltage
Input Offset Current
Open Loop Gain
PSRR
Output Sink Current
Output Source Current
Unity Gain Bandwidth
Slew Rate
VCC = 5.0V ~ 12.0V
RI = 6.49k, RREF = 11.5k
0°C < TAMB < 70°C
0°C < TAMB < 70°C
VIN = 12.0V, RREF = 13k
or VIN = 5.0V, RREF =11.5k
0°C < TAMB < 70°C
1V < VERROUT < 4V
VCC = 5 - 12V
VERROUT = 1V
VERROUT = 4V
IO < 100µA
IO < 100µA
2
25
-1
5
+/-1
400
450 500
+/-5
+/-5
0.1
90
80
2.5
2
5
10
Units
V
V
°C
°C
°C/W
°C/W
°C
°C
Max Units
14 V
mA
V
k
mV/V
mV
1%
%
%
1000
550
kHz
kHz
%
mV
µA
dB
dB
mA
mA
MHz
V/uS
2
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320


Part Number SC2422A
Description BIPHASE CURRENT MODE CONTROLLER
Maker Semtech Corporation
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