BIPHASE CURRENT MODE
CONTROLLER
PRELIMINARY - August 7, 2000
SC2422A
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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.
FEATURES
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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
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Intel Advanced Microprocessors
TM
AMD Athlon power supplies
Servers/Workstations, high density power supplies
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-16
TEMP. RANGE (T
J
)
0 - 125擄C
SC2422ACS.TR
SC2422A.EVB
Evaluation Board
TYPICAL APPLICATION SCHEMATIC
INPUT
Rsens
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 1000 devices.
VIN
1
1
VID4
VID3
VID2
VID1
VID0
ERROUT
FB
RREF
VCC
BGOUT
OC+
OUT1
OUT2
OC-
UVLO
GND
16
3
2
3
4
5
6
7
Rf
8
15
4
14
13
12
11
1
10
3
9
4
Rref
BOOST
8
IN
VCC
VDD
DRVH
7
6
5
To Processor
VID control
PHASE
DRVL
PGND
2
SC1305
BOOST
8
VIN
DRVH
7
6
5
IN
VCC
VDD
PHASE
DRVL
SC2422A
Ri
PGND
2
SC1305
Vout
1
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC2422AEVB相關(guān)型號(hào)PDF文件下載
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