LTC1473 LINER [Linear Technology], LTC1473 Datasheet

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LTC1473

Manufacturer Part Number
LTC1473
Description
Dual PowerPathTM Switch Driver
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIO S
TYPICAL
Power Path Management for Systems with Multiple
DC Sources
All N-Channel Switching to Reduce Power Losses and
System Cost
Switches and Isolates Sources Up to 30V
Adaptive High Voltage Step-Up Regulator for N-Channel
Gate Drive
Capacitor Inrush and Short-Circuit Current Limited
User-Programmable Timer to Limit Switch Dissipation
Small Footprint: 16-Pin Narrow SSOP
Notebook Computers
Portable Instruments
Handi-Terminals
Portable Medical Equipment
Portable Industrial Control Equipment
BAT1
4700pF
DCIN
C
TIMER
BAT2
*COILCRAFT 1812LS-105XKBC
1 F
APPLICATION
MMBD2838LTI
1 F
U
MMBD914LTI
MANAGEMENT
FROM POWER
U
1mH*
P
1
2
3
4
5
6
7
8
IN1
IN2
DIODE
TIMER
V
V
SW
GND
GG
+
LTC1473
MBRD340
SENSE
SENSE
SAB1
SAB2
GA1
GB1
GA2
GB2
+
16
15
14
13
12
11
10
9
DESCRIPTIO
The LTC
single and dual battery notebook computers and other
portable equipment. The LTC1473 drives two sets of back-
to-back N-channel MOSFET switches to route power to the
input of the main system switching regulator. An internal
boost regulator provides the voltage to fully enhance the
logic level N-channel MOSFET switches.
The LTC1473 senses current to limit surge currents both
into and out of the batteries and the system supply
capacitor during switch-over transitions or during fault
conditions. A user-programmable timer monitors the time
the MOSFET switches are in current limit and latches them
off when the programmed time is exceeded.
A unique “2-diode mode” logic ensures system start-up
regardless of which input receives power first.
PowerPath is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Si9926DY
Si9926DY
®
1473 provides a power management solution for
U
R
0.04
SENSE
Dual PowerPath
Switch Driver
C
OUT
INPUT OF SYSTEM
HIGH EFFICIENCY DC/DC
SWITCHING REGULATOR
(LTC1735, ETC)
LTC1473
1473 TA01
1
TM

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LTC1473 Summary of contents

Page 1

... The LTC 1473 provides a power management solution for single and dual battery notebook computers and other portable equipment. The LTC1473 drives two sets of back- to-back N-channel MOSFET switches to route power to the input of the main system switching regulator. An internal boost regulator provides the voltage to fully enhance the logic level N-channel MOSFET switches ...

Page 2

... SAB2 C = 1000pF 20V (Note 4) GS SAB1 SAB2 U W INFORMATION ORDER PART TOP VIEW NUMBER 16 GA1 15 SAB1 14 GB1 LTC1473CGN + 13 SENSE LTC1473IGN – 12 SENSE 11 GA2 GN PART MARKING 10 SAB2 9 GB2 1473 GN PACKAGE 1473I = 125 C, = 150 MIN TYP MAX 4.75 – = 20V 100 SENSE 7 ...

Page 3

... TEMPERATURE ( C) Undervoltage Lockout Threshold (V vs Temperature 5.5 5.0 START-UP 4.5 THRESHOLD 4.0 SHUTDOWN 3.5 THRESHOLD 3.0 2.5 2.0 1.5 1.0 – 50 – TEMPERATURE ( C) LTC1473 = 0V. Gate rise times are measured from 1V to SENSE DC Supply Current vs V 500 V 450 DIODE SENSE + V 400 350 300 250 200 150 100 0 2.5 5 7.5 10 12.5 100 125 ...

Page 4

... LTC1473 W U TYPICAL PERFORMANCE CHARACTERISTICS Turn-Off Delay and Gate Fall Time vs Temperature 2 20V 2 1000pF LOAD V = 20V SAB 1.8 GATE FALL 1.6 TIME 1.4 TURN-OFF 1.2 DELAY 1.0 0.8 0.6 0.4 – 50 – 100 125 0 TEMPERATURE ( C) 1473 G07 Logic Input Threshold Voltage vs Temperature 1 1.8 1.7 1.6 1.5 V HIGH 1.4 1.3 V LOW 1.2 1.1 1.0 – 50 – 25 ...

Page 5

... GB1 drive the gates of the first back-to-back external N-channel switches. switching GG SAB1 (Pin 15): Source Return. The SAB1 pin is connected to the sources and SW B1. A small pull-down current source returns this node to 0V when the switches are turned off. LTC1473 + – – exceeds SENSE SENSE 5 ...

Page 6

... LTC1473 U U FUNCTIONAL DIAGRA IN1 1 IN2 2 DIODE 5.5 A TIMER 4 TO GATE DRIVERS + GND INRUSH CURRENT SENSE + 900k – 1.20V V GG SWITCHING REGULATOR GA1 16 SW A1/B1 GATE SAB1 15 DRIVERS GB1 SENSE – 12 SENSE GA2 11 SW A2/B2 GATE SAB2 10 DRIVERS ...

Page 7

... U OPERATION The LTC1473 is responsible for low-loss switching and isolation at the “front end” of the power management system, where up to two battery packs can be connected and disconnected seamlessly. Smooth switching between input power sources is accomplished with the help of lowloss N-channel switches. They are driven by special ...

Page 8

... P. Using Tantalum Capacitors The inrush (and “outrush”) current of the system DC/DC regulator input capacitor is limited by the LTC1473, i.e., the current flowing both in and out of the capacitor during transitions from one input power source to another is limited. In many applications, this inrush current limiting makes it feasible to use smaller tantalum surface mount capacitors in place of larger aluminum electrolytics ...

Page 9

... DC/DC converter) to ensure that the power DCIN SW A1 BAT1 ON BAT2 Figure 4. LTC1473 PowerPath Switches in 2-Diode Mode W U management P is powered even under start-up or abnor- mal operating conditions. (An undervoltage lockout circuit defeats this mode when the V mately 3.2V. The supply to V sources, DCIN, BAT1 and BAT2 through three external diodes as shown in Figure 1 ...

Page 10

... LTC1473 U U APPLICATIONS INFORMATION As a general rule, select the switch with the lowest R and able to withstand the maximum allowable V will minimize the heat dissipated in the switches while increasing the overall system efficiency. Higher switch resistances can be tolerated in some systems with lower ...

Page 11

... C1 and C2 can be ceramic capacitors. DCIN LTC1473 + V + (8. GATE GG DRIVERS SWITCHING REGULATOR GND *COILCRAFT 1812LS-105 XKBC. (708) 639-6400 Figure 5. V Step-Up Switching Regulator GG LTC1473 output and should be at least 1 F and rated GG BAT1 BAT2 L1* 1mH 50V 50V 1473 F05 regu ...

Page 12

... NiCd DCIN * COILCRAFT 1812LS-105XKBC 12 U MMBD2838LT1 1 2 750k 3 C TIMER 4 4700pF 500k POWER MANAGEMENT P SMBus BATTERY CHARGER Si9926DY LTC1473 16 1 IN1 GA1 2 15 IN2 SAB1 3 DIODE 14 C GB1 TIMER 4700pF TIMER SENSE – V SENSE ...

Page 13

... F BATTERY 0.1% R21 164k 0.1% LTC1473 35V 2 L1* R SENSE 10 H 0.015 C OUT + Q2 R1 100 F 105k D2 10V MBRS140T3 1% 3 SGND Si9926DY LTC1473 16 1 IN1 GA1 15 2 IN2 SAB1 DIODE GB1 SENSE 0.033 TIMER SENSE – V SENSE GA2 GG ...

Page 14

... SUPPLY V2 *1812LS-105XKBC, COILCRAFT 14 Protected Automatic Switchover Between Two Supplies 1 8 LT1121 MMBD2838LT1 LT1490 7 C6 4700pF + L1*, 1mH Si9926DY LTC1473 1 16 IN1 GA1 2 15 IN2 SAB1 3 14 DIODE GB1 0.033 SENSE TIMER – V SENSE 6 11 ...

Page 15

... TYP 0.008 – 0.012 (0.203 – 0.305) LTC1473 0.189 – 0.196* (4.801 – 4.978) 0.009 (0.229 REF 0.150 – 0.157** (3.810 – 3.988) ...

Page 16

... COMMENTS Internal Charge Pump Requires No External Components Rugged, Designed for Harsh Environment Low Voltage Version of the LTC1473; Operates with 3.3V Input Designed to Interface with a Power Management Charge Current; High Efficiency; Adaptive Current Limiting Up to 1.5A Charge Current for Lithium-Ion, NiCd and NiMH Batteries ...

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