LTC3456 Datasheet, PDF (26/28 Pages) Linear Technology – 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

LTC3456
TYPICAL APPLICATIO
2 AA Cells Power Complete Power Supply for Handheld Devices
2 AA ⁺
CELLS
C1
4.7µF
L2
4.7µH
L3
10µH
C10
22µF
V_BATT
SW2_BST SW2_BK
V_INT
V_MAIN
USB
USBHP
A0
CONTROLLER
SUSPEND
USB POWER
(4.35V TO 5.5V)
USB
C2
AIN
4.7µF
1Ω
LTC3456
HSO
V_EXT
AC
ADAPTER
(5V ±10%)
1k
EXT_PWR
SW1
V_EXT
C4
D1
10µF
FB1
11.3k
C3
4.7µF
4.32k
1Ω
WALLFB
PWRKEY
V_MAX
PBSTAT RESET MODE PWRON PGND AGND
MAIN OUTPUT
3.3V
C9
1µF
100k
100mA
49.9k
20k
Q1
LCD LOGIC BIAS
2.8V
C8 _10mA
2.2µF
L1
10µH
100k
220pF
FLASH MEMORY CARD
3.3V
C7 50mA
1µF
CORE OUTPUT
1.8V
C6 ^200mA
10µF
80.6k
C5
1µF
V_MAX
(TO REAL-TIME CLOCK)
MICROCONTROLLER
3456 TA02a
C1, C6 TO C10: X5R OR X7R, 4V
L1, L3: MURATA LQH32CN100K53
C2 TO C5: X5R OR X7R, 6.3V
L2: MURATA LQH32CN4R7M53
D1: ON SEMICONDUCTOR MBRM120E Q1: PHILIPS MMBT3906
V_CORE
100mV/DIV
(AC COUPLED)
I_L1
200mA/DIV
V_MAIN
200mV/DIV
(AC COUPLED)
I_L2
200mA/DIV
Load Transient (Battery Powered)
V_BATT = 2.4V
100µs/DIV
I_MAIN = 20mA TO 100mA
I_CORE = 20mA TO 150mA
3456 TA02b
Load Transient (USB/Wall Powered)
V_CORE
100mV/DIV
(AC COUPLED)
I_L1
200mA/DIV
V_MAIN
200mV/DIV
(AC COUPLED)
I_L3
200mA/DIV
V_EXT = 5V
200µs/DIV
I_MAIN = 20mA TO 100mA
I_CORE = 5mA TO 150mA
3456 TA02c
3456fa
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