InfoCard 18
Solutions for Desktop Computers
Rev F 0997
ICs for Low Voltage Microprocessor, Logic and Bus Termination
, LTC and LT are registered trademarks of Linear Technology Corporation.
UltraFast is a trademark of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
■
Linear Regulation Solutions Featuring
Fast Transient Response
■
Switching Regulators for Up to 30A
at >90% Efficiency
■
GTL+ Termination Solutions
■
Reset Generation for PCI Applications
■
15kV ESD Tolerant RS232 Interface
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
Switching Regulator for Pentium
®
II Processor Includes Digital Control
LTC
®
1553 High Efficiency Switching Regulator Controller
■
Digitally Programmable 1.8V to 3.5V Fixed Output Voltage
■
Provides All Features Required by the Intel Pentium
®
Pro
Processor Specifications
■
Flags for Power Good, Over-Temperature and Over-Voltage Fault
■
Output Current Exceeds 14A from a 5V or 12V Supply
■
All N-Channel External MOSFETs
■
Excellent Output Regulation: ±1% Over Line, Load
and Temperature Variations
■
High Efficiency: Over 95% Possible
■
Adjustable Current Limit Without External Sense Resistors
■
Fast Transient Response
■
Available in 20-Pin SSOP
PWRGD
FAULT
OT
V
ID0
TO V
ID4
OUTEN
COMP SS SGND GND SENSE
10µF
Q1*
Q2*
0.1µF
V
CC
I
MAX
PV
CC
PV
CC
12V
V
IN
5V
L
O
1.5µH
18A
LTC1553
G1
I
FB
G2
+
0.1µF
1553 F01
C
C
1000pF
R
C
33k
5.6k 1.6k
5.6k
5.6k
C
SS
0.01µF
0.1µF10µF
C
IN
1200µF
×3
v
OUT
1.8V TO
3.5V
14A
C
OUT
1500µF
×4
+
+
C1
100pF
+
5
PENTIUM PRO
SYSTEM
*SILICONIX SUD50N03-10
■
Single (LT1573, LT1575) and
Dual (LT1577) Regulators
■
Use External MOSFET (LT1575,
LT1577) for High Efficiency
or PNP (LT1573) for Lower Cost
■
Reduces Cost by Eliminating Alumi-
num and Tantalum Output Capacitors*
■
Short-Circuit Protection Without
Current Sense Resistor
■
Guaranteed 1% Output Voltage
Accuracy (Over Temperature)
■
Extremely Low Dropout Voltage
Possible: 0.1V at 10A
*LT1573 requires only one 220µF tantalum capcitor
330µ
6.3v
UltraFast
TM
Regulators Minimize Bulk Output Capacitors
Single and Dual Fast Transient Response Pecision Regulators
+
COMP
V
OUT
V
IN
DRIVE
FB
LATCH
SHDN
GND
LT1573
+
C
TIME
C
OUT2
220µF
TANT
C
OUT1
1µF
CER
× 24
+
C
C
, 100pF
V
IN
R
C
1k
R
D
24Ω
V
OUT
GND
1573 F01
R
B
50Ω
R1
1.6k
R2
1k
LOAD
+ +
Q
OUT
MOTOROLA
D45H11
V
OUT
= 1.265V (1 + R1/R2)
FOR T < 45°C, C
OUT1
= 24 × 1µF Y5V CERAMIC
FOR T > 45°C, C
OUT1
= 24 × 1µF X7R CERAMIC
PLACE C
OUT1
IN THE µPROCESSOR SOCKET CAVITY
C
IN
100µF
TANT
InfoCard 18
Solutions for Desktop Computers
High Power, High Efficiency Switching Regulator Contoller Solution
LTC1430 Drives Large N-Channel MOSFETs for High Output Currents
+
C
IN
220µF
×4
C
OUT
330µF
×6
+
+
+
2.4µH/15A
PV
CC1
V
CC
FREQSET
SHDN
COMP
SS
PV
CC2
PGND
GND
G1
I
FB
I
MAX
G2NC
IC18 1430-1
SHUTDOWN
FB NC
Q1, Q2: IR IRL3103
C
IN
: AVX-TPSE227M010R0100
C
OUT
: AVX-TPSE337M006R0100
SENSE
+
LTC1430
SENSE
–
16k
100Ω
R
C
7.5k
C
C
4700pF
C1
220pF
1N4148
1k
0.1µF
1µF
0.01µF
0.1µF
4.7µF0.1µF
3.3V
10A
Q1
Q2
5V
2
C3 TO C6
100µF
C1, C2
100µF
A SINGLE LT1585-1.5 5A REGULATOR
MAY BE USED IN APPLICATIONS WITH
A CENTRALIZED REGULATOR AND
MINIMAL V
TT
DISTRIBUTION DROPS
+
C7 TO
C12
1µF
R1
75ΩR5
100ΩR7
100ΩR8
100ΩR6
100ΩR3
75Ω
R4
150Ω
R2
150Ω
V
REF
V
REF
Q1
+
3.3V
V
TT
= 1.5V
3A
V
IN
V
OUT
GND
LT1585A-1.5
C13
0.1µF
Q2
IC18 1587
C14
0.1µF
RX
TX
RX
TX
GTL+ Bus Regulator Has Fast Response and Tight Regulation
+
1 8
0.1µF
1µF
15
1k
IC18 1339
SYNC
I
AVG
V
C
V
REF
SENSE
+
SENSE
–
FB
TG
TS
BG
13
2
4
3
5
7
10
19
18
16
17 20
11
12
9
RUN
5V
REF
SLOPE
CT
SGND
12V
IN
BOOST
1N914
LT1339
PGND
2200pF
4.7k
100k
10V TO
16V
15k
2200pF
1500pF
1µF
2200µF
6.3V
OS-CON
3.3V
50A
IRL3803
IRL3103D2
×4
10µH
50A
R
SELECT
1.66k
R
SENSE
0.002Ω
1N5817
+
1000µF
16V
×2
OS-CON
R
SELECT
3K
1.66K
1.25K
450Ω
5Ω
V
OUT
5V
3.3V
2.8V
1.8V
1.3V
R
SENSE
0.01Ω
0.005Ω
0.002Ω
I
LIMIT
10A
20A
50A
■
High Voltage: Operation Up to 60V Max
■
High Current: Dual N-Channel
Synchronous Drive Handles Up to
10,000pF Gate Capacitance
■
Programmable Average Load
Current Limiting
■
Programmable Fixed Frequency
Synchronizable Current Mode
Operation Up to 150kHz
■
Undervoltage Lockout with Hysteresis
■
Programmable Start Inhibit for
Power Supply Sequencing and Protection
■
Adaptive Nonoverlapping Gate Drive
Prevents Shoot-Through
High Efficiency 10V-18V to 3.3V at 50A Conversion for
Multiple High Performance Processors
LT1339 Handles High Input Voltage and Large N-Channel MOSFETs
■
High Power 5V to 3.xV Switching Controller:
Can Exceed 10A Output
■
All N-Channel External MOSFETs
■
Excellent Output Regulation:
±1% Over Line and Load
■
Constant Frequency Operation—Small L
■
High Efficiency: Over 95% Possible
■
Fast Transient Response
■
Adjustable or Fixed 3.3V Output
■
Available in 8- and 16-Lead DIP
and Narrow SO Packages
■
Best Solution for Intel
Pentium Pro Processor
GTL+ Supply
■
Fast Transient Response
■
Guaranteed Dropout Voltage
■
Load Regulation: 0.05% Typ
■
Trimmed Current Limit
■
On-Chip Thermal Limiting
InfoCard 18
Solutions for Desktop Computers
SUPPLY DRIVER
PART DRIVERS RECEIVERS REQUIRED I
Q
(TYP) SHUTDOWN COMMENTS DISABLE
LT1133A 3 5 5V 15mA No PC/DTE Interface No
LT1137A 3 5 5V 12mA Yes Flow-Through Architecture Yes
LT1039A 3 3 5V, ±12V 1mA Yes One Receiver Active in Shutdown No
LT1039A-16 3 3 5V, ±12V 1mA No Rugged MC145406 Replacement No
LT1141A 3 5 5V, ±12V 8mA, ±2mA Yes PC/DTE Interface Yes
LT1180A 2 2 5V 9mA Yes Ideal for Surface Mount No
3
Dual High Performance Regulator for Microprocessor Core and I/O Supplies
LT1577 Dual Regulator Controller Handles High Current Loads
■
UltraFast Transient Response Eliminates
Tantalum and Electrolytic Output Capacitors
■
1% Reference for Each Regulator
■
Typical Load Regulation: 1mV
■
High Side Current Sense Limit
■
Independent Enables for Proper Sequencing
LT1577
12V
5V
IPOSA
INEGA
GATEA
SHDNA
OUTA
COMPA
IPOSB
INEGB
GATEB
SHDNB
OUTB
COMPB
ENABLE
2.5
2.5V
CORE
SUPPLY
ENABLE
3.3
IC18 1577
3.3V
I/O
SUPPLY
+
++
330µ
6.3v
Triple Supply Monitor for PCI Applications
LTC1536 Monitors Multiple Supply Voltages with High Accuracy
■
Monitors 5V, 3.3V and Adjustable Inputs Simultaneously
■
Guaranteed Threshold Accuracy: ±0.5%
■
Low Supply Current: 20µA (LTC1326)
65µA (LTC1536)
■
Internal Reset Time Delay: 200ms
■
Manual Pushbutton Reset Input
■
Active Low and Active High Reset Outputs
■
Active Low Soft Reset Output
■
Power Supply Glitch Immunity
■
Guaranteed Reset for VCC3 ≥ 1V
■
Meets PCI tFAIL Timing Specifications (LTC1536)
■
8-Pin SO and MSOP Packages
V
CC3
(V)
0
2.0
2.5
3.5
1.5 2.5
IC18 1536-2
1.5
1.0
0.5 1.0 2.0 3.0 3.5
0.5
0
3.0
HRST OUTPUT VOLTAGE (V)
V
CC5
= V
CCA
= 5V
4.7k PU FROM RST TO V
CC3
RST Output Voltage
vs Supply Voltage
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
LTC1326 OR
LTC1536
3.3V
SOFT RESET
SYSTEM RESET
PUSHBUTTON
RESET
5V
IC18 1536-1
ADJUSTABLE
REGULATOR
FEEDBACK PIN
Low Power, 15kV ESD Protected, RS232 Transceivers
■
±15kV ESD Human Body Model
■
±15kV IEC-1000-4-2 Air Gap Test
■
±8kV IEC-1000-4-2 Contact Test
InfoCard 18
Solutions for Desktop Computers
©1994 LT/GP 0997 10K
7A and 10A Very Low Dropout Regulators for Low Voltage Microprocessors
LT158x Regulates from 3.3V to 2.5V with
±
1% Accuracy
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
PROCESSOR TYPE CORE VOLTAGE CORE CURRENT REGULATOR I/O VOLTAGE I/O CURRENT REGULATOR
Pentium® II Processor 2.8V +100mV/–60mV 14.2A LTC1553 (S) or 3.3V 2A LT1587
233MHz/266MHz LTC1430 (S) LT1575
LT1573
Pentium® Pro Processor 3.3V ±5% 10A to 14A LTC1553 (S) or None
166MHz/180MHz/200MHz LTC1430 (S)
GTL+ Terminator 1.5V ±2% 5.7A LT1585-1.5 (L) ×2 None
LT1585A-1.5 (L)
LT1575 (L)
Pentium® Processor with 2.8V ±100mV 6.5A LTC1430 (S) 3.3V ±5% 0.65A LT1587
MMXTM Technology LT1584 (L)
166MHz/200MHz/233MHz LT1580 (L)
LT1575 (L)
Pentium Processor 3.5V ±2.9% 4.5A LTC1430 (S) Same as
133MHz/166MHz/200MHz LT1585 (L) Core
LT1575 (L)
AMD K6TM with MMX 2.9V ±5% 7.5A LTC1553 (S) or 3.3V ±5% 0.52A LT1587
166MHz/200MHz/233MHz 3.2V ±100mV 9.5A LTC1430 (S)
AMD K5 2.38V to 4A LTC1553 (S) 3.3V ±5% 1A to 3A LT1587
3.60V ±5% LTC1430 (S)
LT1585 (L)
LT1575 (L)
Cyrix 6x86MXTM 2.9V ±100mV 6.3A to 9.5A LTC1430 (S) 3.3V ±5% 0.1A
133MHz/150MHz/166MHz LT1581 (L)
188MHz/200MHz/225MHz LT1575 (L)
233MHz
Cyrix 6x86 3.15V to 3.6V 4.7A to 6.6A LTC1430 (S) Same as
80MHz/100MHz/110MHz LT1584 (L) Core
120MHz/133MHz LT1575 (L)
Cyrix 6x86L 2.8V ±6% 4.7A to 6A LTC1430 (S) 3.3V ±4.5% 0.1A
100MHz/110MHz/120MHz LT1584 (L)
133MHz/150MHz LT1575 (L)
IBM PowerPCTM 740/750 2.6V ±100mV 3A LT1587 (L) 3.3V ±5% 0.25A
200MHz/233MHz/266MHz LT1573 (L)
IBM PowerPC 604e 1.9V ±100mV 5.9A LT1584 (L) 3.3V ±5% 0.35A
250MHz/300MHz/350MHz LT1575 (L)
IBM PowerPC 604e 2.5V ±5% 5.3A LTC1430 (S) 3.3V ±5% 0.5A
180MHz/200MHz/225MHz LT1584 (L)
233MHz LT1580 (L)
IBM PowerPC 603e 2.5V ±5% 2.4A LT1587 (L) 3.3V ±5% 0.2A
200MHz/225MHz/233MHz LT1573 (L)
240MHz/250MHz
L = Linear Regulator, S = Switching Regulator, Penitum is a registered trademark of Intel Corp, MMX is a trademark of Intel Corp, K6 is a trademark of
Advanced Micro Devices Inc, 6x86MX is a trademark of Cyrix Corp, PowerPC is a trademark of IBM Corp.
■
Low Dropout: Tested Limits
■
Fast Transient Response
■
Remote Sense
■
1mV Load Regulation
■
Fixed 2.5V Output or
Adjustable Output
■
No Supply Sequencing
Problems in Dual Supply Mode
OUTPUT CURRENT (A)
0
MINIMUM POWER VOLTAGE (V)
(VPOWER – VOUT)
0.9
0.8
0.7
0.6
0.5
1 5 78910
IC18 1580-2
423 6
0.4
0.3
0.2
0.1
0
LT1580-2.5
LT1581-2.5
TJ = 25°C
DATA SHEET LIMITS
Dropout Power Guaranteed Test Points
OUTPUT
SENSE
ADJGND
0.1µF
IC18 1580-1
10µF
TANT
330µF
OS-CON
LT1580: 2.5V AT 7A
LT1581: 2.5V AT 10A
LT1580: 3.3V AT 7A
LT1581: 3.3V AT 10A
LT158x-2.5
100µF TANT
AVX TPS
× 7
POWER
5V
0.2A CONTROL
+
+
+
+
