LTC4416-1 Linear Technology, LTC4416-1 Datasheet

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LTC4416-1

Manufacturer Part Number
LTC4416-1
Description
Low Loss Dual PowerPath Controllers
Manufacturer
Linear Technology
Datasheet
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
PowerPath is a trademark of Linear Technology corporation.
All other trademarks are the property of their respective owners.
GND
V1
V2
, LT, LTc and LTM are registered trademarks of Linear Technology corporation.
V1 = 13.5V (RESTORE)
Designed Specifically to Drive Large and Small Q
PFETs
Very Low Loss Replacement for Power Supply
OR’ing Diodes
Wide Operating Voltage Range: 3.6V to 36V
–40°C to 125°C Operating Temperature Range
Reverse Battery Protection
Automatic Switching Between DC Sources
Low Quiescent Current: 35µA per Channel
Load Current Sharing
MOSFET Gate Protection Clamp
Precision Input Control Comparators for Setting
Switchover Threshold Points
Open-Drain Feedback Points for Customer Specified
Hysteresis Control
Minimal External Components
Space Saving 10-Lead MSOP Package
High Current PowerPath Switch
Industrial and Automotive Applications
Uninterruptible Power Supplies
Logic Controlled Power Switch
Battery Backup System
Emergency Systems with Battery Backups
V2 = 10.8V
V1 = 12V (FAIL)
187k
Automatic PowerPath Switchover
221k
24.9k
PRIMARY SUPPLY
E1
GND
E2
H2
H1
BACKUP SUPPLY
LTC4416
U
V1
G1
V
G2
V2
S
SUP75P03_07
SUP75P03_07
U
4416 TA01
V
S
8.0
3.6
0
LTC4416 vs Schottky Diode
0.02
LTc4416
Forward Voltage Drop
FORWARD VOLTAGE (V)
cONSTANT
cONSTANT
VOLTAGE
R
ON
G
ScHOTTKY
DIODE
DESCRIPTIO
The LTC
P-channel MOSFETs to create two near ideal diode functions
for power switchover circuits. This permits highly efficient
OR’ing of multiple power sources for extended battery life
and low self heating. When conducting, the voltage drop
across the MOSFET is typically 25mV. For applications with
a wall adapter or other auxiliary power source, the load is
automatically disconnected from the battery when the aux-
iliary source is connected.
The LTC4416 integrates two interconnected PowerPath
controllers with soft switchover control. The “soft-off”
switchover permits the users to transfer between two dis-
similar voltages without excessive voltage undershoot (or
V
contain a “fast-on” feature that dramatically increases gate
drive current when the forward input voltage exceeds 25mV.
The LTC4416 “fast off” feature is engaged when the sense
voltage exceeds the input voltage by 25mV. The LTC4416-1
enables the fast off under the same conditions and when
the other external P-channel device is selected using the
enable pins.
The wide operating supply range supports operation from one
to eight Li-Ion cells in series. The low quiescent current (35µA
per channel) is independent of the load current. The gate driver
includes an internal voltage clamp for MOSFET protection.
The LTC4416/LTC4416-1 are available in low profile 10-lead
MSOP packages.
DROOP
PowerPath Controllers for
4416 TA01b
0.5
) in the output supply. The LTC4416/LTC4416-1 also
®
HYSTERESIS
GND
4416/LTC4416-1 control two sets of external
V
V
TH2
IN
24.9k
WITH
Under and Overvoltage Shutdown Operation
UV ENABLED AT 5V, V
OV ENABLED AT 13.5V, V
LTC4416/LTC4416-1
36V, Low Loss Dual
221k
HYSTERESIS
187k
V
U
TH1
24.3k
WITH
IN
RESTORED TO LOAD WHEN V
75k
IN
RESTORED TO LOAD WHEN V
182k
H1
E1
GND
E2
H2
Large PFETs
www.DataSheet4U.com
LTC4416-1
G1
G2
V1
V
V2
S
IN
RISES TO 5.5V
IN
FALLS TO 12V
4416 TA01c
4416fa

V
TO
LOAD
OUT
TM

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LTC4416-1 Summary of contents

Page 1

... The LTC4416 “fast off” feature is engaged when the sense voltage exceeds the input voltage by 25mV. The LTC4416-1 enables the fast off under the same conditions and when the other external P-channel device is selected using the enable pins ...

Page 2

... LTC4416/LTC4416-1 ABSOLUTE AXI U RATI (Note 1) Supply Voltage (V1, V2) .............................. –14V to 40V Voltage from ....................... –40V to 40V S Input Voltage E1, E2 .................................................... –0.3V to 40V V ........................................................... –14V to 40V S Output Voltage G1 ....... –0.3V to the Higher 0. ....... –0.3V to the Higher 0. H1, H2 ..................................................... –0. Operating Ambient Temperature Range (Note 2) LTC4416E ............................................ – ...

Page 3

... V – < –6V 17nF (Note > –1.5V 17nF (Note (Note 14) LTC4416-1 Only 3.6V ≤ ≤ 36V (Note 10 3.6V ≤ ≤ 36V (Note 10 (Note 11) (Note 11) 3.6V ≤ ≤ 36V, –40°C to 85° ≤ ...

Page 4

... LTC4416/LTC4416-1 TYPICAL PERFOR A CE CHARACTERISTICS Temperature and Supply FR Voltage 40 35 –40°C 27°C 30 125° SUPPLY VOLTAGE (V) 4416 G01 V1, V2 and V Pin Leakage vs S Temperature –0.25 –0. – 28V – 28V – ...

Page 5

... If the E1 signal is driven low, the V1 path will perform a “soft-off” provided the PFET(s) are properly configured for blocking DC current. An internal current sink will pull the E1 pin down when the E1 input exceeds 1.5V. E1 (Pin 2): LTC4416-1 Comparator Enable Input. A high signal greater than V will enable the V1 path. The ideal REF diode action will then determine if the V1 path should turn on by controlling any PFET(s) connected to the G1 pin ...

Page 6

... OPERATIO U Operation can best be understood by referring to the Block Diagram which illustrates the internal circuit blocks. The LTC4416/LTC4416-1 are divided into three sections, namely: 1. The channel 1 controller consisting of A1, C1, the “first analog contoller,” the G1 drivers and the H1 output driver. 2. The band-gap reference 3. The channel 2 controller consisting of A2, C2, the “ ...

Page 7

... This means that G2 will only provide an I current instead of either an I G(SRC) current. 4416 F01 When V E2 enabled, and G2 will become active implementing the I – output current listed in Figure 1. LTC4416/LTC4416-1 www.DataSheet4U.com FR – When GFON(SNK) E2 Operation Mode I ...

Page 8

... GFON(SNK) LTC4416-1 OPERATION The LTC4416-1 is designed for overvoltage/undervoltage protection or when either voltage path must be turned off rapidly, regardless of the status of the other voltage input. The LTC4416-1 does not implement the soft-off feature < channel 2 VS RTO implemented in the LTC4416. The E1 and E2 inactive will force the I Table 2 explains the operation of the E1 and E2 inputs ...

Page 9

... In this case the LTC4416 acts S as two interconnected ideal diode controllers. V supplied by the higher of the two supplies, V1 and V2 and V2 are exactly the same, then 50% of the current for V will be supplied by each supply. As the two supplies S LTC4416/LTC4416-1 www.DataSheet4U.com SUP75P03_07 PRIMARY SUPPLY Q1 R1A 221k LTC4416 ...

Page 10

... Figure 5. Dual PowerPath for Current Sharing LTC4416-1 The LTC4416-1 will support all three of the LTC4416 applications without the “soft-off” feature. The only dif- ference in the two designs is the LTC4416-1 will rapidly switch off the load from a supply whenever a channel disabled ...

Page 11

... Figure 8. Transient Response of the LTC4416 vs the LTC4416-1 Light Load with a Large Capacitor OUT TO LOAD 4416 F07 Figure 9. Close Up of the Transient Response of the LTC4416 Rapidly Rising Input LTC4416/LTC4416-1 www.DataSheet4U.com time prior to the rapid pull- E(OFF) which has a minimum current of 500µA. G(OFF) = ...

Page 12

... LTC4416/LTC4416-1 PACKAGE DESCRIPTIO 0.889 ± 0.127 (.035 ± .005) GAUGE PLANE 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.18 0.305 ± 0.038 0.50 (.007) (.0120 ± .0015) (.0197) BSc TYP REcOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INcH) 2. DRAWING NOT TO ScALE 3. DIMENSION DOES NOT INcLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. ...

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