Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
, LTC and LT are registered trademarks of Linear Technology Corporation
PowerPath is a trademark of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corp.
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
Rev J 0299
LOW VOLTAGE
PENTIUM
®
II
PROCESSOR POWER
PROCESSOR,
MEMORY
AND
CORE LOGIC
SERIAL
PORT
2.XV
ENABLE
3.3V
5V
BACKUP
RESET
5V
3.3V
2.XV
RESET
NiCd/NiMH
BUTTON CELL
SMBus
SMBus
2
BACKUP
VPPEN
12V
BRIDGE
BATTERY
DC/DC
CONVERTER
LTC1558
LTC1559
TRIPLE
SUPPLY
MONITOR
LTC1326
SYSTEM
DC/DC
CONVERTER
*LTC1438/39
*LTC1625x 2
*LTC1628
CORE DC/DC
CONVERTER
*LTC1436A
*LTC1702/03
*LTC1735/36
POWER
MANAGEMENT
MICROCONTROLLER
Li-Ion/NiMH
SMART BATTERY
Li-Ion/NiMH
SMART BATTERY
†
U.S. PATENT #5,723,970
*
U.S. PATENT #5,481,178
BATTERY
CHARGER
LT1505
†
LT1511
†
LTC1759
†
LT1769
†
KEYBOARD
CONTROLLER
SERIAL
INTERFACE
LT1537
PCMCIA
INTERFACE
LTC1472 (2X)
LOW NOISE
DC/DC
CONVERTER
LT1376
PCMCIA
CONTROLLER
LCD
CONTROLLER
5V 3V
12V
V
BATT
LCD
DISK
DRIVE
MULTIMEDIA
AUDIO
SUBSYSTEM
KEYBOARD
BACKLIGHT
AND
CONTRAST
GENERATOR
LT1184F
LT1186F
LT1786F
(SMBus
Controlled)
2
2
CONTROL
IV
SMBus
POWER
SWITCH
CONTROLLER
LTC1623
LTC1710
N
N
CHARGER
DC INPUT
INFRARED
INTERFACE
LT1328
PC CARD
PowerPath
TM
CONTROLLER
LTC1473
LTC1479
SMBus
ACCELERATOR
LTC1694
V
DD
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
2
1-Step Power Conversion for Portables
1-Step for CPU Power Benefits
■Familiar Approach for Existing Portable Designs
■Power Losses More Evenly Distributed over Multiple Converters
LTC1735/LTC1736 Synchronous, VID for CPU Power
■Built-In 5-Bit Adjustable VID VOUT Selection
■Stronger Gate Drivers and Smaller RSENSE for Highest Efficiency
■Programmable Fixed Frequency Operation, Synchronizable
■±1% 0.8V Reference for Accurate Low Voltage Output
■Very Low Dropout: 99% Duty Cycle
■Micropower Shutdown, Overvoltage Protection, Latched Short-Circuit
Shutdown, Current Limit Foldback, Power Good Output, Optional
Programmable Soft Start
■Pin Compatible with LTC1435 with Minor Component Changes
LTC1628 2-Phase Synchronous for System Power
■Industry’s First 2-Phase Converter IC: Reduces Required Input Caps
and Lowers Power Supply Noise
■Stronger Gate Drivers and Smaller RSENSE for Highest Efficiency
■New OVP Soft-Latch Function Controls Output in Transient, Overload
and Noise Conditions Instead of Latching OFF
■Built-In 5V and 3.3V Standby Regulators Remain Active in Shutdown
I
IN(MEAS)
= 2.53A
RMS
1-Phase Operation
LDO
LDO
12V
0.2A
2.5V
0.5A
5V
2.5A
(TOT 3A)
3.3V
3A
(TOT 3.5A)
1.XV
9A+
1.8V
3A
LTC1735 OR
LTC1736 (VID)
LTC1624
LTC1628
V
BATT
INPUT VOLTAGE (V)
0
RMS CURRENT (A)
3.0
2.5
2.0
1.5
1.0
0.5
0
10 20 30 40
1628 F04
SINGLE PHASE
DUAL CONTROLLER
2-PHASE
DUAL CONTROLLER
V
O1
= 5V/3A
V
O2
= 3.3V/3A
Choose the Right Synchronous DC/DC Converter for Your Portable
LTC1438 LTC1538-AUX* LTC1702 LTC1735
CHARACTERISTICS LTC1436A LTC1438-ADJ LTC1539* LTC1625 LTC1628* LTC1703 LTC1736
Number of Controllers Single Dual Dual Single Dual Dual Single
2-Phase — ——
——
Built-In VID Output Control —
—
———
LTC1703 LTC1736
Reference Voltage/Accuracy 1.19V ± 1% 1.19V ± 1% 1.19V ± 1% 1.19V ± 1% 0.8V ± 1% 0.8V ± 1% 0.8V ± 1%
No Sense Resistor Required — — —— —
Auxiliary Linear Regulator(s) —— 3.3V & 5V — —
Synchronizable — — LTC1539 ——
Packaging 24-SSOP 28-SSOP 28-SSOP 16-SSOP, SO 28-SSOP 24-SSOP 16-SSOP, SO
36-SSOP 28-SSOP 24-SS0P
All controllers include: Dual Synchronous N-Channel Drive, Micropower Shutdown, Programmable Soft Start, Remote Output Sensing,
99% Maximum Duty Cycle for low dropout operation, and Wide V
IN
Range, 3.5V to 36V.
* Standby Regulators can be kept alive during shutdown.
I
IN(MEAS)
= 1.55A
RMS
2-Phase Operation
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
3
2-Step Power Conversion for Portables
Desktop/Server Distributed Power Architecture
1-Step vs 2-Step Operating Efficiency
V
IN
= 12V, Typical Load Conditions
Benefits
■Converters Operating Near 50% Duty Cycles Allow Lower Voltage
Swings, Less Switching Loss and Higher Switching Frequency
■Higher Switching Frequency Means Smaller, Lower Cost Compo-
nents and Faster Transient Response
■Allows Very Low Output Voltages for New Generations of
Microprocessors
■Symmetrical Transient Response: Fast in Both Directions
■Lower Heat Generation in the Area of the Microprocessor
■Easier, More Efficient Optimization of Loop Dynamics over
Narrower Input Voltage Range
■Reduced Peak Currents from Battery
■Same Overall System Efficiency (See Chart Below)
LTC1702/LTC1703 Dual Synchronous VID for
CPU Power
■2-Phase Dual Controllers for Core and I/O Supplies: Minimize CIN
■Voltage Mode with No Sense Resistors Required
■550kHz Minimizes Component Sizes, <1µH Inductor
■Intel Mobile VID Compliant (LTC1703)
■1% Output Accuracy over Line and Load Variations
■Strong Gate Drivers: To 20A Output per Channel
2-Step for CPU Power
*Efficiency = × 100%
Total Output Power
Total Output Power + Total Power Lost
2-Step for CPU Power
DC/DC OUTPUT POWER
OUTPUT/I
LOAD
POWER EFFICIENCY* LOST
3.3V/1.5A
†
8.54W 93% 0.64W
5V/1A
†
14.78W 94% 0.94W
1.6V/5.5A 8.8W 90% 0.98W
1.8V/1.5A 2.7W 92% 0.23W
2.5V/0.2A 0.5W 76% 0.16W
CCFL 8W 90% 0.89W
TOTAL POWER 30W 88.6% 3.84W
TO LOADS
LDO
LDO
12V
0.2A
2.5V
0.5A
5V
2.5A
(TOT 3A)
†
3.3V
3A
(TOT 3.5A)
†
1.XV
9A+
1.8V
3A
LTC1702 OR
LTC1703 (VID)
LTC1628
V
BATT
5V OR
3.3V
†
Does not include current required to power LTC1702 or LTC1703 for CPU power.
1-Step for CPU Power
DC/DC OUTPUT POWER
OUTPUT /I
LOAD
POWER EFFICIENCY* LOST
3.3V/1.5A 5.61W 93% 0.42W
5V/1A 5W 95% 0.26W
1.6V/5.5A 8.8W 86% 1.43W
1.8V/1.5A 2.7W 80% 0.68W
2.5V/0.2A 0.5W 76% 0.16W
CCFL 8W 90% 0.89W
TOTAL POWER 30W 88.6% 3.84W
TO LOADS
Same Overall System Efficiency!
4
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
LTC1694 SMBus Accelerator
Dual Battery Power Path Controller: LTC1473
Power Management Solution for Single and Dual Battery Notebook Computers
Comparison of SMBus Waveforms for
the LTC1694 vs Resistor Pull-Up
LTC1694
1V/DIV
V
CC
= 5V 1µs/DIV
C
LD
= 200pF
f
SMBus
= 100kHz
■
Generally Required to Meet SMBus Rise Time
Specs and Maintain Bus Speed
■
Dual SMBus Active Pull-Up Ensures Data Integrity
■
Improves Low State Noise Margin
■
Auto Detect Low Power Standby Mode
■
Tiny 5-Lead SOT-23 Package
■
Wide Supply Voltage Range: 2.7V to 6V
■
See Design Note 193 for Details
Battery Backup Controllers: LTC1558/LTC1559
LOAD CURRENT (mA)
0
0
BACKUP TIME (MINUTES)
50
150
200
250
350
400
450
1558 TA02
100
300
10 25 30
515 20
V
CC
= 3.3V
V
BAK
= 3.78V
NiCd CELL
CAPACITY = 110mAHrs
Backup Time
vs 3.3V Output Load Current
Backup Battery System
■
Complete Backup Battery System
■
Generates Adjustable Backup Voltage from a Single 1.2V NiCd Button Cell
■
Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency
■
Short-Circuit Protection and Thermal Limiting
■
SSOP and SO Packages
■
The LTC1559 Provides Fixed 3.3V or 5V Backup Voltages
Power Management System for Dual Battery Notebook Computer
■
Power Path Management for Systems with Multiple DC
Sources of up to 30V
■
All N-Channel Switching for Lower Power Losses and
Lower Cost
■
Adaptive High Voltage Step-Up Regulator for Gate Drive
■
Capacitor Inrush and Short-Circuit Current Limited
■
Programmable Timer to Limit Switch Dissipation
■
16-Pin Narrow SO Package
■
LTC1473L Version for 3.3V to 10V Sources
IN1
IN2
DIODE
TIMER
V
+
V
GG
SW
GND
GA1
SAB1
GB1
SENSE
+
SENSE
–
GA2
SAB2
GB2
LTC1473
C
OUT
R
SENSE
0.04Ω
1µF
1µF
MMBD914LTI
1mH*
Si9926DY
MMBD2838LTI
BAT1
DCIN
BAT2
INPUT OF SYSTEM
HIGH EFFICIENCY DC/DC
SWITCHING REGULATOR
(LTC1435, ETC)
FROM POWER
MANAGEMENT
µP
C
TIMER
4700pF
MBRD340
Si9926DY
*COILCRAFT 1812LS-105XKBC
+
+
+
1µF
1.2V
NiCd
BACKUP
**BATTERY
MAIN
BATTERY
4.5V TO 10V
14k 100k
LOAD CURRENT
3A AT NORMAL MODE
30mA AT BACKUP MODE
LTC1558-3.3
22µH*
R4
221k
1%
220k
100k
1%
8
7
6
5
2
1
RESET
S1
Si4431DY
1558 TA01
3
4
V
CC
V
BAK
BACKUP
RESET
GND
SW
CTL
FB
+
SUMIDA CD54-22µH
SANYO CADNICA N-110AA
CONSULT LTC1435 DATA SHEET FOR
CIRCUIT APPLICATION INFORMATION
100µF
16V
×2
*
**
†
V
CC
3.3V
SYSTEM
µP
0.1µF
+
LTC1435
†
SYNCHRONOUS
BUCK REGULATOR
+
R
PULL-UP
= 15.8k
V
CC
SCL
SMBus
SDA
Tiny SOT-23
Package
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
5
LCD Display Backlight and Contrast: LT1786F
CCFL Inverter with SMBus
Brightness Control
■Wide Battery Input Range: 4.5V to 30V
■Grounded Lamp or Floating Lamp Configurations
■Open Lamp Protection
■Precision 100µA Full-Scale DAC Programming
Current with 6-Bit Control
■DAC Setting Is Retained in Shutdown
■Micropower Standby Mode: 35µA Total Supply Current
Choose the Right LCD Illumination Supply
Characteristics LT1182 LT1183 LT1184F LT1186 LT1786F
LCD Contrast Supply
LCD Reference Pinned Out N/A N/A N/A
Digital Brightness Controller
■
Charge Li-Ion, NiCd, NiMH: Only One Resistor
(or DAC) Required to Program Charging Current
■
Charge Any Number of Cells Up to 21V
■
Small Surface Mount Packages
■
LT1505: Step-Down, 0.5V Dropout Voltage
– Precision 5% Charge Current Accuracy
– Precision ±1% Preset Battery Voltages: 12.3V,
12.6V, 16.4V and 16.8V
– AC Adapter Current Limit*
– End-of-Charge Flag 4A Lithium-Ion Battery Charger
5Ω
C
PROG
1µF
300Ω
C7
0.68µF
C6
0.1µF
C3
2.2µF
C
OUT
22µF
25V
×2
C2
0.68µF
V
BAT
12.6V
BATTERY
M1
Si4412
M2
Si4412 D4
MBRS140
D2
1N4148
D3
1N4148
R7
500Ω
100k
R5
4k
R1
1k
R6
4k
R
S4
0.025Ω
M3
Si4435
DBODY TO
SYSTEM POWER
V
IN
(FROM
ADAPTER)
R
S1
0.025Ω
L1
15µH
1505 F01
R
PROG
4.93k
1%
0.33µF
R
X4
3k
R
S2
200Ω
1%
R
S3
200Ω
1%
C
IN
47µF
35V
C1
1µF
C4
0.1µF
BAT2 BAT SENSE
LT1505
V
CC
BOOST BOOSTC
SPIN
PGND
AGND
4.1V
4.2V
V
FB
3 CELL
PROG
V
C
BGATE
COMP1
CAP
FLAG
SHDN
SYNC
UV
INFET
SW
TGATE
GBIAS
CLP
CLN
90% Efficient CCFL with SMBus Control of Lamp Current
– Soft Start, Shutdown Control and Sync
■
LT1505-1: Similar to LT1505 but No AC
Adapter Current Limit
■
LT1510: 1.5A Step-Down, On-Chip
Switch
– (+) or (–) Terminal Sensing
■
LT1511: 3A Step-Down, On-Chip Switch
– AC Adaptor Current Limit*
■
LT1512/ LT1513:
– SEPIC Topology: 500kHz
– 1.5A Switch (LT1512): 3A Switch
(LT1513)
■
LTC1759: Smart Battery Charger—
NEW
– 100% SMBus Compliant (Rev 1.0)
– AC Adapter Current Limit*
*U.S. Patent #5,723,970
High Efficiency Battery Chargers
Constant-Voltage/Constant-Current Battery Chargers
Battery Charger Selection Guide
CHARACTERISTICS LT1505 LT1510 LT1511 LT1512 LT1513 LTC1759 LT1769
Maximum Charging Current * 1.5A 3A 1A 2A to 8A 2A
Step-Up — — — —–
Step-Down
Packaging 24-SSOP 16-SO 24-SSOP SO-8 7-DD 36-SSOP 28-SSOP
16-PDIP 8-PDIP
*Dependent upon pass element and source chosen. 4A example below.
BAT
8V TO 28V
16
15
14
13
12
11
10
9
I
CCFL
DIO
CCFL V
C
AGND
SHDN
SMBSUS
CCFL V
SW
BULB
BAT
ROYER
V
CC
I
OUT
SCL
CCFL
PGND
ADR
LT1786F
LAMP
UP TO 6mA
10 6
L1
R1
750Ω
L2
100µH
321 5
4
+
+
C7, 1µF
C1*
0.068µF
C5
1000pF
R2
220k
R3
100k
C3A
2.2µF
35V
C4
2.2µF
V
IN
3.3V
OR 5V
LT1186F • TA01
C3B
2.2µF
35V
C2
27pF
3kV
+
Q2* Q1*
SHUTDOWN
D5
BAT85
SDA
1
2
3
4
5
6
7
8D1
1N5818
TIE ADR TO GND OR
V
CC
TO SELECT ONE
OF THE LT1786F'S
TWO SMBUS ADDRESSES
TO SMBUS
HOST
Portable Computer
Power Supply and Communications Solutions
InfoCard 15
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
ic15fj ©1994 LT/TP 0299 3K
Micropower Precision Triple Supply Monitor: LTC1326
Multiple Supply Monitoring with Integrated Reset
PUSHBUTTON
RESET
1326 TA01
V
CC3
V
CC5
0.1µF
V
CCA
GND
RST
PBR SRST
LTC1326
2.9V
3.3V
5V
DC/DC
CONVERTER SYSTEM
LOGIC
■
Simultaneously Monitors 5V, 3.3V and Adjustable Voltages
■
Guaranteed Threshold Accuracy: ±0.75%
■
Low Supply Current: 20µA
■
Power Supply Glitch Immunity
■
Manual Pushbutton Reset Input: Soft Reset
■
Active Low and Active High Reset Outputs
■
8-Lead SO and MSOP Packages
■
New LTC1326-2.5 Monitors 2.5V, 3.3V and Adjustable Voltages
■
LTC1536 Meets PCI t
FAIL
Timing Specifications
SMBus Dual High Side Switches: LTC1623/LTC1710
Linear Technology PCMCIA Product Family
DEVICE
DESCRIPTION PACKAGE
LT1312 Single PCMCIA VPP Driver/Regulator 8-Pin SO
LT1313 Dual PCMCIA VPP Driver/Regulator 16-Pin SO*
LTC1314 Single PCMCIA Switch Matrix 14-Pin SO
LTC1315 Dual PCMCIA Switch Matrix 24-Pin SSOP
LTC1470 Protected V
CC
5V/3.3V Switch Matrix 8-Pin SO
LTC1471 Dual Protected V
CC
5V/3.3V Switch Matrix 16-Pin SO*
LTC1472 Protected V
CC
and VPP Switch Matrix 16-Pin SO*
*Narrow Body
Protected PCMCIA Interface: LTC1472
■V
CC
and VPP Switching in a Single IC
■Built-In Current Limit and Thermal Shutdown
■Extremely Low R
DS(ON)
NMOS Switches
■1µA Quiescent Current in Standby
■Narrow SO Package
Low Power 5V RS232 Transceivers
■Uses Small Capacitors: 0.1µF, 0.2µF
■CMOS Compatible Low Power: 60mW
■3V Logic Compatible
■Operates to 120kBaud
■1µA Supply Current in Shutdown Mode
■Receiver Keep-Alive in Shutdown
■SO and SSOP Packages
3V TYP Rx I
Q
IN
SUPPLY OR 5V POWER ACTIVE SHDN DRIVER 10kV 0.1µF DEVICE
VOLTAGE LOGIC DISS(mW) IN SHDN (µA) DISABLE ESD CAPS TYPE
556001 15kV LT1137A
5 5 30 1 60 15kV * LT1237
3 3 1.5 0 1 — LTC1327
5 5 1.5 0 1 — LTC1337
5 & 3 3 1.5 0 or 5 0.2 or 10 — LTC1348
3 3 1.5 2 35 — LTC1350
554051 LT1537
*Requires one 1µF capacitor
±15kV
ESD
SMBus Controlled Dual-Load Switch
V
CC
2.7V TO 5.5V
10µF
(PROGRAMMABLE)
* SILICONIX Si69260Q
Q2
Q1
LOAD2
LOAD1
1623 TA01
(FROM
SMBus)
LTC1623
GND
V
CC
AD0
AD1
CLK
DATA
GA
GB
*
CHARGE
PUMP
81
2
10µF10µF
7
5
CLOCK
DATA 6
FROM SMBus
3
AD1
(PROGRAMMABLE)
4
1710 TA01
V
CC
2.7V TO 5.5V SW0D
0V TO V
CC
LTC1710
LOAD 1
SW0
SW1 LOAD 2
■SMBus and I2CTM Compatible
■Built-In Gate Drive Charge Pumps
■Low Standby Current: 17µA
■8-Lead MSOP and SO Packages
■Peripheral Control and Power
Plane Switching
■LTC1623: Drives External N-Channel
MOSFETs
■LTC1710: Dual Internal N-Channel
MOSFETs
MEMBER COMPANY
PCMCIA
I
2
C is a trademark of Philips Electronics N.V.
