sc1154 Semtech Corporation, sc1154 Datasheet

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sc1154

Manufacturer Part Number
sc1154
Description
Programmable Synchronous Dc/dc Hysteretic Controller For Advanced Processors
Manufacturer
Semtech Corporation
Datasheet

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PRELIMINARY - March 1, 2000
DESCRIPTION
The SC1154 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply
applications where efficiency is the primary concern.
The controller is a hysteretic type, with a user se-
lectable hysteresis. The SC1154 is ideal for imple-
menting DC/DC converters needed to power advanced
microprocessors such as Pentium
and multiple processor configurations. Inhibit, under-
voltage lockout and soft-start functions are included for
controlled power-up.
SC1154 features include an integrated 5 bit D/A con-
verter, temperature compensated voltage reference,
current limit comparator, over-current protection, and
an adaptive deadtime circuit to prevent shoot-through
of the power MOSFET during switching transitions.
Power good signaling, logic compatible shutdown, and
over-voltage protection are also provided. The inte-
grated D/A converter provides programmability of out-
put voltage from 2.0V to 3.5V in 100mV increments
and 1.3V to 2.05V in 50mV increments with no external
components.
The SC1154 high side driver can be configured as ei-
ther a grounded reference or as a floating bootstrap
driver. High and low side drivers have a peak current
rating of 2 amps.
PIN CONFIGURATION
© 2000 SEMTECH CORP.
(28-Pin SOIC)
Top View
®
ll, in both single
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
SIMPLIFIED BLOCK DIAGRAM
FEATURES
APPLICATIONS
ORDERING INFORMATION
Note:
(1) Add suffix ‘TR’ for tape and reel.
SC1154CSW
652 MITCHELL ROAD NEWBURY PARK CA 91320
DEVICE
Programmable hysteresis
5 bit DAC programmable output (1.3V-3.5V)
On-chip power good and OVP functions
Designed to meet latest Intel specifications
Up to 95% efficiency
+ 1% tolerance over temperature
Server Systems and Workstations
Pentium
Multiple Microprocessor Supplies
Voltage Regulator Modules
(1)
®
II Core Supply
Pentium is a registered trademark of Intel Corporation
PACKAGE
SO-28
TEMP. RANGE (T
0 - 125°C
SC1154
J
)
1

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sc1154 Summary of contents

Page 1

... D/A converter provides programmability of out- put voltage from 2.0V to 3.5V in 100mV increments and 1.3V to 2.05V in 50mV increments with no external components. The SC1154 high side driver can be configured as ei- ther a grounded reference floating bootstrap driver. High and low side drivers have a peak current rating of 2 amps. ...

Page 2

... Lead Temperature (Soldering) 10 seconds Storage Temperature © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS Symbol VIN MAX STG 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 Maximum Units -0 ...

Page 3

... Programming Input (LSB). (1) 28 PWRGD Power Good. This open collector logic output is high if the output voltage is within 5% of the set point. © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 DS(ON) LOAD 3 ...

Page 4

... UVLO threshold during start-up 200kHz, BOOT = 13V, BOOTLO = 0V 50pF DH 11.4V < VIN12V < 12.6V, over full VID REF range (see Output Voltage Table) TH(H) TH( 5mA SAT O OVP 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 MIN TYP MAX UNITS 11 µ 2. ...

Page 5

... V = 11.9V IOUT_ACC HISENSE IOUTLO V = 0.5V 12V, IOUT IOUT HISENSE V = 11.5V IOUTLO V = 0.05V 12V, IOUT IOUT HISENSE V = 12V IOUTLO V = 11V, HISENSE R = 10k0hm IOUT 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 MIN TYP MAX UNITS 10.4 13 15.6 µ 2.0 2.4 V 9.25 10 10.75 V 1 µ ...

Page 6

... DRV DRV DRV duty cycle < 2%, tpw < 100us, HIGHDR’ 125 C HIGHDR 6.5V, V BOOT BOOTLO HIGHDR = 1.5V (src HIGHDR (sink) (Note 1) 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 MIN TYP MAX UNITS 0 2 1.0 V 2. ...

Page 7

... LOWDR 10mV overdrive, 1.3V < Vref < 3. 9nF 6.5v, HIGHDR BOOT V = grounded, HIGHDR BOOTLO T = 125 ° 9nF 6.5v, DRV T = 125 °C LOWDR J 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 MIN TYP MAX UNITS 150 250 µ µs 1 µ ...

Page 8

... LOSENSE grounded VDSRED 3v < V < 11v SWXDLY HISENSE LOSENSE HISENSE PWRGD t overdrive = 10mv SLST t NUL 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 MIN TYP MAX UNITS 2 µs 3 µs 3 µs 300 500 ns 30 100 ns 1 µs ...

Page 9

... PRELIMINARY - March 1, 2000 BLOCK DIAGRAM © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 9 ...

Page 10

... MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 VID0 VDC (V) 1 1.30 0 1.35 1 1.40 0 1.45 1 1.50 0 1.55 1 1.60 0 1.65 1 1.70 0 1.75 1 1.80 0 1.85 1 1.90 0 1.95 1 2. CPU 0 2. ...

Page 11

... VOUT during a low to high load current transient. The overshoot during a high to low load current transient is reduced by subtracting the voltage that is on the DROOP pin from VREF. The voltage on the IO pin is divided down with an external 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 11 ...

Page 12

... The drive regulator provides drive voltage to the low side driver, and to the high side driver when the high side driver is configured as a floating driver. The mini- mum drive voltage is 7V. The minimum short circuit current is 100mA. is also the current 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 12 ...

Page 13

... PRELIMINARY - March 1, 2000 APPLICATION CIRCUIT © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 13 ...

Page 14

... AVX 0.1µF 0.33µF 470µF, 6.3V (TPS) AVX 2.2µF, 16V MBRD1035 MOT 1µH, DO5022P-102 Coilcraft 1.5µH, DO5022P-152HC Coilcraft IRL3103NS, D2PAK Int. Rect. IRL2203NS, D2PAK Int. Rect 2.7K 100 20K 150 10K 2.2 3.9 SC1154, SO-28 SEMTECH 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 Vendor Notes 14 ...

Page 15

... PRELIMINARY - March 1, 2000 EVALUATION BOARD ARTWORK © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS TOP LAYER BOTTOM LAYER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 15 ...

Page 16

... PRELIMINARY - March 1, 2000 EVALUATION BOARD LAYOUT © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS TOP VIEW BOTTOM VIEW 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 16 ...

Page 17

... PRELIMINARY - March 1, 2000 TEST DATA 100.0 95.0 90.0 85.0 % 80.0 75.0 70.0 65.0 60.0 0 5.00 4.00 3.00 2.00 1.00 % 0.00 0 -1.00 -2.00 -3.00 -4.00 -5.00 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS SC1154 Efficiency Vo Vin = Output Current, A SC1154 Voltage Regulation Output Current, A 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 3.5 2.8 2.0 1.5 20 3.5 2 1.5 17 ...

Page 18

... PRELIMINARY - March 1, 2000 OUTLINE - SO-28 ECN00-904 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 18 ...

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