LTC3455_15 Datasheet, PDF (2/28 Pages) Linear Technology – Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

LTC3455/LTC3455-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
FB1 1
PROG 2
TIMER 3
CHRG 4
USBHP 5
SUSPEND 6
18 FB2
17 AO
16 AI
25
15 HSON
14 HSO
13 HSI
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
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
LTC3455EUF#PBF
LTC3455EUF#TRPBF
3455
24-Lead (4mm × 4mm) Plastic QFN
LTC3455EUF-1#PBF
LTC3455EUF-1#TRPBF 34551
24-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications 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.
PARAMETER
CONDITIONS
MIN
TYP
MAX
Battery Undervoltage Lockout Voltage V_BAT Rising
Battery Undervoltage Lockout Hysteresis
2.9
3.0
3.2
450
V_BAT Pin Quiescent Current (Note 3)
Burst Mode, Battery Powered
PWM Mode, Battery Powered
USB Powered
Wall Powered
Shutdown
ON Pin Threshold
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
160
500
800
10
20
10
20
2
4
0.8
1.1
PWRON Pin Threshold
0.8
1.0
ON2 Pin Threshold
0.8
1.0
MODE Pin Threshold
0.8
1.0
WALLFB Pin Threshold Voltage
WALLFB Rising
l 1.20
1.23
1.26
WALLFB Pin Hysteresis
60
UNITS
V
mV
μA
μA
μA
μA
μA
V
V
V
V
V
mV
3455fc
2