LTC3455 Datasheet, PDF (2/24 Pages) Linear Technology – Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

LTC3455
ABSOLUTE AXI U RATI GS
(Note 1)
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
UW U
PACKAGE/ORDER I FOR ATIO
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
ORDER PART
NUMBER
LTC3455EUF
UF PART
MARKING
3455
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 36°C/W, θ_JC = 2.5°C/W
EXPOSED PAD (PIN 25) IS GND
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q 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
Battery Undervoltage Lockout Voltage
Battery Undervoltage Lockout Hysteresis
V_BAT Pin Quiescent Current (Note 3)
Burst Mode, Battery Powered
PWM Mode, Battery Powered
USB Powered
Wall Powered
Shutdown
ON Pin Threshold
PWRON Pin Threshold
ON2 Pin Threshold
MODE Pin Threshold
WALLFB Pin Threshold Voltage
WALLFB Pin Hysteresis
ON Pin Pullup Current
PWRON Pin Pulldown Current
ON2 Pin Pulldown Current
MODE Pin Pullup Current
WALLFB Pin Input Bias Current
PBSTAT Pin Low Voltage
RST Pin Low Voltage
RST Pulse Duration
CONDITIONS
V_BAT Rising
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
WALLFB Rising
V_ON = 1V
V_PWRON = 1V
V_ON2 = 1V
V_MODE = 1V
V_WALLFB = 1.35V
V_ON = 0V, I_PBSTAT = 100µA
V_ON = 0V, I_PBSTAT = 1mA
I_RST = 100µA
I_RST = 1mA
After FB1 and FB2 in Regulation
MIN TYP MAX UNITS
2.9
3.0
3.2
V
450
mV
110 160
µA
500 800
µA
10
20
µA
10
20
µA
2
4
µA
0.8
1.0
V
0.8
1.0
V
0.8
1.0
V
0.8
1.0
V
q 1.20 1.23 1.26
V
60
mV
2.5
µA
2.5
µA
2.5
µA
2.5
µA
q
±1
±30
nA
0.02 0.10
V
0.20 0.35
V
0.02 0.10
V
0.20 0.35
V
200
ms
3455f
2