Datasheet

LTC3455/LTC3455-1
2
3455fc
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Transient (t < 1ms and Duty Cycle < 1%):
V
MAX
USB Voltages .................................. –0.3V to 7V
Steady State:
V
BAT
, V
MAX
, USB Voltages ........................ –0.3V to 6V
SW1, SW2 Voltages ................... –0.3V to (V
MAX
+ 0.3V)
TIMER Voltage ........................... –0.3V to (V
MAX
+ 0.3V)
PWRON, ON, ON2, HSON Voltages ............. –0.3V to 6V
PBSTAT, RST, CHRG, AO Voltages ............... –0.3V to 6V
HSI, HSO Voltages ....................................... –0.3V to 6V
MODE, USBHP, SUSPEND Voltages.............. –0.3V to 6V
WALLFB, AI, PROG Voltages ........................ –0.3V to 2V
FB1, FB2 Voltages ........................................ –0.3V to 2V
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range- .................–65°C to 125°C
(Note 1)
24
25
23 22 21 20 19
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
FB1
PROG
TIMER
CHRG
USBHP
SUSPEND
FB2
AO
AI
HSON
HSO
HSI
ON PBSTAT PWRON MODE RST ON2
SW1
USB
V
BAT
V
MAX
WALLFB
SW2
T
JMAX
= 125°C, θ
JA
= 37°C/W, θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3455EUF#PBF LTC3455EUF#TRPBF 3455
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
LTC3455EUF-1#PBF LTC3455EUF-1#TRPBF 34551
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Undervoltage Lockout Voltage V
BAT
Rising 2.9 3.0 3.2 V
Battery Undervoltage Lockout Hysteresis 450 mV
V
BAT
Pin Quiescent Current (Note 3)
Burst Mode,
Battery Powered
PWM Mode, Battery Powered
USB Powered
Wall Powered
Shutdown
V
ON2
= V
MODE
= 1V, Not Switching
V
ON2
= 1V, V
MODE
= 0V, Not Switching
V
USB
= 5V, Charger Off
V
WALL
= 1.5V, V
MAX
= 4.5V, Charger Off
V
PWRON
= 0V, V
MAX
= 0V
110
500
10
10
2
160
800
20
20
4
μA
μA
μA
μA
μA
ON Pin Threshold 0.8 1.1 V
PWRON Pin Threshold 0.8 1.0 V
ON2 Pin Threshold 0.8 1.0 V
MODE Pin Threshold 0.8 1.0 V
WALLFB Pin Threshold Voltage WALLFB Rising
l
1.20 1.23 1.26 V
WALLFB Pin Hysteresis 60 mV
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BAT
= 3.6V, V
MAX
= 3.6V, V
PWRON
= 2V, V
ON
is open, V
ON2
= 0V,
V
USB
= 0V, V
WALLFB
= 0V unless otherwise noted.