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Linear Technology Electronic Components Datasheet

LTC2952 Datasheet

Pushbutton PowerPath Controller

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FEATURES
n Pushbutton On/Off Control
n Automatic Low Loss Switchover Between DC
Sources
n Wide Operating Voltage Range: 2.7V to 28V
n Low 25μA Shutdown Current
n Guaranteed Threshold Accuracy: ±1.5% of
Monitored Voltage Over Temperature
n Adjustable Pushbutton On/Off Timers
n Simple Interface Allows Graceful μP Shutdown
n Extendable Housekeeping Wait Time Prior to
Shutdown
n 200ms Reset Delay and 1.6s Watchdog Timeout
n ±8kV HBM ESD on PB Input
n 20-pin TSSOP and QFN (4mm × 4mm) Packages
APPLICATIONS
n Desktop and Notebook Computers
n Portable Instrumentations
n Cell Phones, PDA and Handheld Computers
n Servers and Computer Peripherals
n Battery Backup Systems
LTC2952
Pushbutton PowerPath
Controller with Supervisor
DESCRIPTION
The LTC®2952 is a power management device that features
three main functions: pushbutton on/off control of system
power, ideal diode PowerPath™ controllers and system
monitoring. The LTC2952’s pushbutton input, which pro-
vides on/off control of system power, has independently
adjustable ON and OFF debounce times. A simple micro-
processor interface involving an interrupt signal allows
for proper system housekeeping prior to power-down.
The ideal diode PowerPath controllers provide automatic
low loss switchover between two DC sources by regulating
two external P-channel MOSFETs to have a small 20mV
forward drop.
High reliability systems may utilize the LTC2952’s monitor-
ing features to ensure system integrity. These features in-
clude: power-fail, voltage monitoring and μP watchdog.
The LTC2952 operates over a wide operating voltage range
to accommodate a large variety of input power supplies. The
part’s combination of low 20mV external MOSFET regula-
tion and very low standby current matches battery powered
and power conscious application requirements.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
TYPICAL APPLICATION
Pushbutton Controller with Automatic Switchover Between Adapter and Battery
ADAPTER, 3V TO 25V
Si6993DQ
12V BATTERY
Si6993DQ
G1
G2
VS
PFI
VIN VOUT
LT1767-2.5
SHDN
511k
100k
V1 EN **
LTC2952
V2 VM
RST
M1 G1STAT
M2 PFO
INT
PB KILL
365k
100k
2.5V
1k
1k
1k
D2
D3
D1
ONT GND OFFT WDE
*22nF
*68nF
*OPTIONAL
**SHDN INTERNALLY PULLED UP BY THE LT1767-2.5
10k
μP
2952 TA01
Ideal Diode vs Schottky Diode
Forward Voltage Drop
1
CONSTANT
RON
IDEAL
DIODE
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
0
0.02
FORWARD VOLTAGE (V)
0.50
2952 TA01b
2952fb
1


Linear Technology Electronic Components Datasheet

LTC2952 Datasheet

Pushbutton PowerPath Controller

No Preview Available !

LTC2952
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltages
V1, V2, VS.............................................. –0.3V to 30V
Input Voltages
PB.................................... –6V to MAX (V1, V2, VS) V
ONT, OFFT ............................................... –0.3V to 3V
M1, M2, PFI, VM, WDE, KILL................... –0.3V to 7V
Output Voltages
G1, G2, EN .................... –0.3V to MAX (V1, V2, VS) V
G1STAT, PFO, RST, INT............................ –0.3V to 7V
Input Currents
PB.......................................................–1mA to 100μA
Operating Temperature Range
LTC2952C ................................................ 0°C to 70°C
LTC2952I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
M2 1
M1 2
KILL 3
VM 4
PFI 5
WDE
PB
RST
PFO
ONT
6
7
8
9
10
TOP VIEW
20 G1STAT
19 G1
18 V1
17 VS
16 V2
15 G2
14 EN
13 INT
12 GND
11 OFFT
F PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 90°C/W
TOP VIEW
20 19 18 17 16
VM 1
PFI 2
WDE 3
PB 4
RST 5
15 V1
14 VS
21 13 V2
12 G2
11 EN
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21), PCB GND CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2952CF#PBF
LTC2952CF#TRPBF
LTC2952CF
20-Lead Plastic TSSOP
0°C to 70°C
LTC2952IF#PBF
LTC2952IF#TRPBF
LTC2952IF
20-Lead Plastic TSSOP
–40°C to 85°C
LTC2952CUF#PBF
LTC2952CUF#TRPBF
2952
20-Lead 4mm × 4mm Plastic QFN
0°C to 70°C
LTC2952IUF#PBF
LTC2952IUF#TRPBF
2952
20-Lead 4mm × 4mm Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2952fb
2


Part Number LTC2952
Description Pushbutton PowerPath Controller
Maker Linear Technology
Total Page 30 Pages
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