Datasheet

LTC3226
4
3226f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 3). V
IN
= 3.3V, V
CPO
= 5V, V
OUT
= 3.3V, VMID = 1/2 V
CPO
unless
otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LDO
Minimum CPO Voltage for LDO Operation 2.4 V
V
LDO_FB
LDO FB Servo Voltage I
VOUT
= 1mA
l
0.76 0.8 0.82 V
Load Regulation ΔV
LDO_FB
/ΔI
OUT
1mA < I
VOUT
< 2A 2.7 mV/A
LDO FET R
DS(ON)
V
CPO
= 3.6V 200 mΩ
I
LDO_FB(LEAK)
LDO_FB Input Leakage Current V
LDO_FB
= 0.9V
l
–60 60 nA
I
LIM
LDO Current Limit 2 4 A
RST_FB, RST
V
RST_FB(TH)
RST_FB Threshold (Falling Edge)
l
0.72 0.74 0.76 V
V
RST_FB(HYS)
RST_FB Hysteresis 20 mV
I
RST_FB(LEAK)
RST_FB Input Leakage Current V
RST_FB
= 0.9V
l
–50 50 nA
RST Output Low Voltage I
SINK
= 5mA 65 mV
RST High Impedance Leakage Current V
RST
= 5V
l
1 µA
RST Delay (RST_FB Rising) 290 ms
Power-Fail Comparator
V
PFI(TH)
PFI Input Threshold (Falling Edge)
l
1.175 1.2 1.225 V
V
PFI(HYS)
PFI input Hysteresis 20 mV
I
PFI(LEAK)
PFI Input Leakage Current V
PFI
= 0.5V
l
–50 50 nA
PFO Output Low Voltage I
SINK
= 5mA 65 mV
I
PFO(LEAK
) PFO High Impedance Leakage Current V
PFO
= 5V
l
1 µA
PFI Delay to PFO (PFI Falling) 0.5 µs
EN_CHG
V
IH
Input High Voltage
l
1.3 V
V
IL
Input Low Voltage
l
0.4 V
I
IH
Input High Current
l
–1 1 µA
I
IL
Input Low Current
l
–1 1 µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much greater than
58.7°C/W.
Note 3: The LTC3226E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3226I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The junction temperature, T
J
, is calculated from the
ambient temperature, T
A
, and power dissipation, P
D
, according to the
formula:
T
J
= T
A
+ (P
D
• 58.7°C/W)
Note that the maximum ambient temperature, consistent with these
specifications, is determined by specific operating conditions in
conjunction with board layout, the rated thermal package thermal
resistance and the environmental factor.
Note 4: Output not in regulation; R
OL
= (2 • V
IN
– V
CPO
)/I
CPO
.