LTC3456 Datasheet, PDF (2/28 Pages) Linear Technology – 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

LTC3456
ABSOLUTE AXI U RATI GS
(Note 1)
V_BATT, V_MAX Voltages ................................. – 0.3V to 6V
V_INT, V_MAIN, V_EXT, HSO Voltages ................ – 0.3V to 6V
SW1, SW2_BK, SW2_BST Voltages ........... – 0.3V to 6V
USB, USBHP, SUSPEND Voltages .............. –0.3V to 6V
PWRKEY, PBSTAT, PWRON Voltages ........ –0.3V to 6V
MODE, AO, EXT_PWR, RESET Voltages ..... –0.3V to 6V
FB1, AIN, WALLFB 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
AIN 1
AO 2
AGND 3
V_BATT 4
SW1 5
PGND 6
18 SUSPEND
17 HSO
16 V_MAIN
25
15 V_INT
14 SW2_BST
13 SW2_BK
7 8 9 10 11 12
ORDER PART
NUMBER
LTC3456EUF
UF PART
MARKING
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/ W, θ_JC = 2°C/ W
EXPOSED PAD (PIN 25) IS PGND
MUST BE SOLDERED TO PCB
3456
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T_A = 25°C.
V_BATT = 2.4V, V_INT = 3.3V, V_PWRON = 2V, PWRKEY is open, V_USB = 0V, V_WALLFB = 0V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX
Battery Voltage Range
1.8
3.2
Quiescent Current (Battery Powered)
Burst Mode^® Operation
PWM Operation
Shutdown
V_BATT Pin Current (Wall Powered)
V_BATT Pin Current (USB Powered)
Switching Frequency
Battery Powered
USB or Wall Powered
Main Output
(Note 3)
V_MODE = 2V, V_FB1 = 1V, V_INT = 3.4V
V_MODE = 0V, V_FB1 = 1V, V_INT = 3.4V
V_PWRON = 0V, V_INT = 0V
V_WALLFB = 1.5V, V_EXT = 5V (Note 4)
V_USB = 5V, V_EXT = 5V (Note 4)
V_BATT = 2.4V
V_EXT = 5V, V_WALLFB = 1.5V
180 250
380 450
0.1
1
1
2
1
2
0.8
1
1.2
0.8
1
1.2
V_INT Voltage Regulation
V_INT Voltage Line Regulation
Max Duty Cycle
V_BATT = 1.8V to 3.2V
● 3.22
3.3
3.38
●
0.1
0.5
● 80
87
Switch Leakage (Battery Powered)
SW2_BST PMOS Switch
SW2_BST NMOS Switch
V_PWRON = 0V
V_{SW2_BST} = 0V
V_{SW2_BST} = 3.3V
Switch On-Resistance (Battery Powered)
SW2_BST PMOS Switch
SW2_BST NMOS Switch
I_{SW2_BST} = 150mA
I_{SW2_BST} = –150mA
Burst Mode is a registered trademark of Linear Technology
0.1
1
0.1
1
0.8
0.5
UNITS
V
µA
µA
µA
µA
µA
MHz
MHz
V
%/V
%
µA
µA
Ω
Ω
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