SC2422ACS.TR Semtech Corporation, SC2422ACS.TR Datasheet

no-image

SC2422ACS.TR

Manufacturer Part Number
SC2422ACS.TR
Description
Manufacturer
Semtech Corporation
Datasheet
1.SC2422ACS.TR.pdf (10 pages)
PRELIMINARY - August 7, 2000
DESCRIPTION
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
© 2000 SEMTECH CORP.
Rf
Ri
INPUT
1
2
3
4
5
6
7
8
Rref
VID4
VID3
VID2
VID1
VID0
ERROUT
FB
RREF
SC2422A
BGOUT
Rsens
UVLO
OUT1
OUT2
GND
VCC
OC+
OC-
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
BIPHASE CURRENT MODE
CONTROLLER
16
15
14
13
12
11
10
9
FEATURES
APPLICATIONS
ORDERING INFORMATION
SC2422ACS.TR
SC2422A.EVB
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 1000 devices.
652 MITCHELL ROAD NEWBURY PARK CA 91320
1
3
4
1
3
4
DEVICE
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)
Intel Advanced Microprocessors
AMD Athlon
Servers/Workstations, high density power supplies
IN
VCC
VDD
IN
VCC
VDD
PHASE
PHASE
DRVH
DRVH
DRVL
SC1305
DRVL
SC1305
(1)
7
6
5
7
6
5
TM
VIN
VIN
power supplies
PACKAGE
SO-16
Evaluation Board
Vout
TEMP. RANGE (T
0 - 125°C
SC2422A
J
1
)

Related parts for SC2422ACS.TR

Image
Part Number
Description
Manufacturer
Datasheet
Request R
sc2422a
Part Number:
sc2422a
Description:
Biphase Current Mode Controller
Manufacturer:
Semtech Corporation
Datasheet:
SC2422A.pdf (10 pages)
6666
Part Number:
6666
Description:
HIGH VOLTAGE CAPACITORS MONOLITHIC CERAMIC TYPE
Manufacturer:
Semtech Corporation
Datasheet:
6666.pdf (2 pages)
EZ1084CM
Part Number:
EZ1084CM
Description:
EZ1084CM5.0 AMP POSITIVE VOLTAGE REGULATOR
Manufacturer:
Semtech Corporation
Datasheet:
EZ1084CM.pdf (4 pages)
EZ1587CM
Part Number:
EZ1587CM
Description:
3.0 AMP LOW DROPOUT POSITIVE VOLTAGE REGULATORS
Manufacturer:
Semtech Corporation
Datasheet:
EZ1587CM.pdf (5 pages)
ACS8515
Part Number:
ACS8515
Description:
Manufacturer:
Semtech Corporation
Datasheet:
ACS8515.pdf (50 pages)
SR3.3
Part Number:
SR3.3
Description:
RailClamp Low Capacitance TVS Diode Array
Manufacturer:
Semtech Corporation
Datasheet:
SR3.3.pdf (7 pages)
SMF05C
Part Number:
SMF05C
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SMF05C.pdf (7 pages)
SC1151CS
Part Number:
SC1151CS
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1151CS.pdf (6 pages)
SC1182CSW
Part Number:
SC1182CSW
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1182CSW.pdf (12 pages)
SC1185CSW
Part Number:
SC1185CSW
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1185CSW.pdf (12 pages)
SC1205
Part Number:
SC1205
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1205.pdf (12 pages)
SC1150CS
Part Number:
SC1150CS
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1150CS.pdf (6 pages)
SC1152CS
Part Number:
SC1152CS
Description:
Manufacturer:
Semtech Corporation
Datasheet:
SC1152CS.pdf (7 pages)
MMBT9012
Part Number:
MMBT9012
Description:
Manufacturer:
Semtech Corporation
Datasheet:
MMBT9012.pdf (3 pages)
MMBT9013
Part Number:
MMBT9013
Description:
Manufacturer:
Semtech Corporation
Datasheet:
MMBT9013.pdf (3 pages)

SC2422ACS.TR Summary of contents

Page 1

... Cycle by cycle current limiting Programmable Internal Oscillator to 1 MHz VID IIIII Inhibit (No CPU) APPLICATIONS Intel Advanced Microprocessors AMD Athlon Servers/Workstations, high density power supplies ORDERING INFORMATION DEVICE SC2422ACS.TR SC2422A.EVB Note: (1) Only available in tape and reel packaging. A reel con- tains 1000 devices. Rsens 1 IN DRVH ...

Page 2

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 ...

Page 3

PRELIMINARY - August 7, 2000 ELECTRICAL CHARACTERISTICS (Cont) Unless specified +5V 25° AMB PARAMETER Current Sense Amplifier Amplifier Gain Input Offset Voltage, Input Referred CMRR PSRR Input Common Mode Range Max Differential Signal/ Current ...

Page 4

PRELIMINARY - August 7, 2000 PIN DESCRIPTION Pin 1: VID4 , MSB Pin 2: VID3 Pin 3: VID2 Pin 4: VID 1 Pin 5: VID0 , LSB Pin 6: ERROUT Error-amplifier output. Pin 7: FB Error-amplifier inverting input. Pin 8: ...

Page 5

PRELIMINARY - August 7, 2000 OUTPUT VOLTAGE (VRM 9.0) Unless specified GND High (or Floating 5V, 2-Phase operation A CC VID4 VID3 ...

Page 6

PRELIMINARY - August 7, 2000 Figure 1: SC2422A SCHEMATIC WITH +5V INPUT FOR THE AMD ATHLON BST 3 820uf,16V 820uf,16V 820uf,16V 1u,16V © 2000 SEMTECH CORP. BIPHASE CURRENT MODE CONTROLLER GND BST GND 8 3 652 MITCHELL ROAD NEWBURY PARK ...

Page 7

PRELIMINARY - August 7, 2000 Applications Information The SC2422A is an Input Current Mode Controller de- signed for High Current, High performance two phase DC/DC converters. The Current mode control is imple- mented by generating the PWM ramp from the ...

Page 8

PRELIMINARY - August 7, 2000 Programming the DAC Step Size The SC2422A allows programming the output voltage and the DAC step size by selecting external resistors. The DAC current step size, for one MSB is DAC _ ...

Page 9

PRELIMINARY - August 7, 2000 Where Input current sense resistor Oscillator period OSC G = Current Amplifier Gain CA 0.3V is the ramp added for slope compensation when the output current is near zero. The ...

Page 10

PRELIMINARY - August 7, 2000 OUTLINE DRAWING SO-16 LAND PATTERN SO-16 ECN00-1242 © 2000 SEMTECH CORP. BIPHASE CURRENT MODE CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A Jedec MS-012AC 10 ...

Related keywords