LTC3456_15 Datasheet, PDF (4/28 Pages) Linear Technology – 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

LTC3456
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
USB
USB Turn-On Voltage Threshold
Rising Edge
3.9
4
4.1
USB Turn-On Voltage Hysteresis
75
USB PMOS Switch On-Resistance
USB Current Limit
SUSPEND Pin Threshold
USBHP Pin Threshold
SUSPEND Pin Pull-Down Current
USBHP Pin Pull-Down Current
USB Pin Bias Current (Suspend Mode)
AC Adapter
V_USB = 5V
V_USBHP = 2V (500mA Mode), V_USB = 5V
V_USBHP = 0V (100mA Mode), V_USB = 5V
V_USB = 5V
V_USB = 5V
V_USB = 5V, V_SUSPEND = 2V
V_USB = 5V, V_USBHP = 2V
V_USB = 5V, V_SUSPEND = 2V
0.5
●
420 500
85
100
0.3
0.8
1.2
0.3
0.8
1.2
2.5
2.5
100 150
WALLFB Pin Threshold
Rising Edge
● 1.2
1.25
1.3
WALLFB Pin Hysteresis
20
WALLFB Pin Input Bias Current
V_EXT UVLO Voltage
V_EXT UVLO Hysteresis
EXT_PWR Pin Low Voltage
Gain Block
V_WALLFB = 1.25V, V_EXT = 5V
Rising Edge
V_USB > 4V and V_SUSPEND = 0V or
WALLFB > 1.25V, I_{EXT_PWR} = 1mA
●
±2
±20
3.9
4
4.1
150
0.25
0.5
AIN Pin Reference Voltage
0.76 0.800 0.84
AIN Pin Input Bias Current
AO Pin Low Voltage
Logic Inputs
V_AIN = 0.8V
V_AIN = 0V, I_AO = 1mA
●
±2
±20
0.25
0.5
PWRKEY Pin Input High Voltage
PWRKEY Pin Input Low Voltage
PWRKEY Pin Pull-Up Resistor to V_MAX
PBSTAT Pin Low Voltage
PWRON Pin Threshold
V_PWRKEY = 0V, I_PBSTAT = 100µA
0.7V_MAX
0.3V_MAX
400
0.05
0.1
0.3
0.8
1.2
PWRON Pin Pull-Down Current
MODE Pin Threshold
V_PWRON = 2V
1
0.3
0.8
1.2
MODE Pin Pull-Down Current
RESET Pin Low Voltage
RESET Pulse Duration
V_MODE = 2V
I_RESET = 100µA
After V_FB1 and V_INT in Regulation
1
0.05
0.1
262
UNITS
V
mV
Ω
mA
mA
V
V
µA
µA
µA
V
mV
nA
V
mV
V
V
nA
V
V
V
kΩ
V
V
µA
V
µA
V
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC3456 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Quiescent current is pulled from the V_INT pin when neither USB
nor wall power is present. Multiply this value by V_INT/V_BATT to get the
equivalent input (battery) current.
Note 4: Quiescent current is pulled from the V_EXT pin when either USB or
wall power is present.
Note 5: Specification is guaranteed by design and not 100% tested in
production.
3456fa
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