LTC3261
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = EN = 12V, MODE = 0V, RT = 200kΩ.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Charge Pump
l
V
V
Input Voltage Range
4.5
3.4
32
4
V
IN
l
l
V
Undervoltage Lockout Threshold
V
IN
V
IN
Rising
Falling
3.8
3.6
V
V
UVLO
IN
I
V
Quiescent Current
Shutdown, = EN = 0V
2
60
3.5
5
120
5.5
μA
μA
mA
VIN
IN
MODE = V , I
= 0mA
= 0mA
IN VOUT
MODE = 0V, I
VOUT
V
V
RT Regulation Voltage
Regulation Voltage
1.200
V
RT
V
MODE = 12V
MODE = 0V
–0.94 • V
IN
V
V
OUT
OUT
–V
IN
f
Oscillator Frequency
RT = GND
450
100
0.4
500
32
550
KHz
Ω
OSC
R
Charge Pump Output Impedance
MODE = 0V, RT = GND
OUT
l
l
l
I
Max I
Short-Circuit Current
V
V
V
= GND, RT = GND
160
1.1
1.0
0.7
1.1
1.0
0.7
250
2
mA
V
SHORT_CKT
VOUT
OUT
V
V
MODE Threshold Rising
MODE(H)
MODE(L)
MODE
MODE Threshold Falling
V
I
MODE Pin Internal Pull-Down Current
EN Threshold Rising
= MODE = 32V
= EN = 32V
μA
V
IN
IN
l
l
V
V
2
EN(H)
EN Threshold Falling
0.4
V
EN(L)
I
EN Pin Internal Pull-Down Current
μA
EN
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.
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
The junction temperature (T , in °C) is calculated from the ambient
J
temperature (T , in °C) and power dissipation (P , in Watts) according to
A
D
Note 2: The LTC3261 is tested under pulsed load conditions such that
the formula:
T ≈ T . The LTC3261E is guaranteed to meet specifications from
J
A
T = T + (P • θ ),
J
A
D
JA
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
LTC3261I is guaranteed over the –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
than 125°C. Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
where θ = 40°C/W is the package thermal impedance.
JA
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 150°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
3261f
3
Linear Systems [ Linear Systems ]
