Datasheet

LT4180
3
4180fb
For more information www.linear.com/4180
elecTrical characTerisTics
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. The LT4180E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= SENSE = 5V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
INTVCC
LDO Regulator Output Voltage in
Dropout
V
IN
= 2.5V 2.2 V
V
OV
Overvoltage Threshold Rising 1.21 V
V
OHYST
Overvoltage Input Hysteresis V
RISING
– V
FALLING
15 80 mV
V
RUN
Run Threshold Falling 1.21 V
V
RHYST
Run Input Hysteresis V
RISING
– V
FALLING
15 80 mV
I
FB
Input Bias Current –0.2 0.2 µA
A
V(RATIO)
Current Amplifier Gain Ratio A
VL
/A
VH
, A
V
Measured in V/V 0.891 0.9 0.909
I
SENSE
Current Amplifier Input Bias Current Measured at SENSE with SENSE = V
IN
–1 1 µA
A
V
∆V
FB
Amplifier Gain 9.7 10 10.3 V/V
I
CHOLD1
Track/Hold Charging Current Measured at CHOLD1 with V
CHOLD1
= 1.2V ±60 µA
I
CHOLD2
Track/Hold Charging Current Measured at CHOLD2 with V
CHOLD2
= 1.2V ±25 µA
I
CHOLD3
Track/Hold Charging Current Measured at CHOLD3 with V
CHOLD3
= 1.2V ±25 µA
I
CHOLD4
Track/Hold Charging Current Measured at CHOLD4 with V
CHOLD4
= 1.5V,
V
CHOLD2
= 1V, V
CHOLD3
= 1.2V
10 µA
Measured at CHOLD4 with V
CHOLD4
= 1.5V,
V
CHOLD2
= 1.4V, V
CHOLD3
= 1.2V
–200 µA
I
SC
Soft-Correct Current Measured at CHOLD4 ±1.5 µA
I
LKG1
Track/Hold Leakage Current Measured at CHOLD1 with V
CHOLD1
= 1.2V ±1 µA
I
LKG2
Track/Hold Leakage Current Measured at CHOLD2 with V
CHOLD2
= 1.2V ±1 µA
I
LKG3
Track/Hold Leakage Current Measured at CHOLD3 with V
CHOLD3
= 1.2V ±1 µA
I
LKG4
Track/Hold Leakage Current Measured at CHOLD4 with V
CHOLD4
= 1.2V ±1 µA
f
OSC
Oscillator Frequency R
OSC
= 20k, C
OSC
= 1nF 170 200 230 kHz
g
mFB
Voltage Error Amplifier
Transconductance
Measured from FB to COMP, V
COMP
= 2V,
OSC Stopped with Voltage Feedback Loop Closed
120 µmho
g
mIAMP
Current Amplifier Transconductance Measured from SENSE to COMP, V
COMP
= 2V,
OSC Stopped with Current Feedback Loop Closed
700 µmho
to 125°C operating junction temperature range are assured by design
characterization and correlation with statistical process controls. The
LT4180I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT4180MP is guaranteed over the full –55°C to
125°C operating junction temperature range.
Note 3. Positive current is defined as flowing into a pin.