LTC3260_15 Datasheet, PDF (4/18 Pages) Linear Technology – Low Noise Dual Supply Inverting Charge Pump

LTC3260
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 LTC3260 is tested under pulsed load conditions such that
T_J ≈ T_A. The LTC3260E 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
LTC3260I is guaranteed over the –40°C to 125°C operating junction
temperature range, the LTC3260H is guaranteed over the –40°C to 150°C
operating junction temperature range and the LTC3260MP is tested and
guaranteed over the full –55°C to 150°C operating junction temperature
range. Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
The junction temperature (T_J, in °C) is calculated from the ambient
temperature (T_A, in °C) and power dissipation (P_D, in Watts) according to
the formula:
T_J = T_A + (P_D • θ_JA),
where θ_JA = 43°C/W is the package thermal impedance.
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.
Typical Performance Characteristics
(T_A = 25°C, C_FLY = 1µF, C_IN = C_OUT = C_LDO+ = C_LDO– = 10µF unless otherwise noted)
Oscillator Frequency
vs Supply Voltage
600
Oscillator Frequency vs R_T
600
R_T = GND
500
500
400
400
300
300
R_T = 200kΩ
200
200
100
0
05
10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3260 G01
Quiescent Current vs Temperature
160
V_IN = 12V
140
Burst Mode OPERATION
120
WITH BOTH LDOs ON
100
80
60
Burst Mode OPERATION
WITH NEGATIVE LDO ON
40
20
POSITIVE LDO ON
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G04
100
0
1
10
100
1000 10000
R_T (kΩ)
3260 G02
Quiescent Current vs Supply
Voltage (Constant Frequency Mode)
16
14
12
10
8
f_OSC = 500kHz
6
f_OSC = 200kHz
4
2
f_OSC = 50kHz
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3260 G05
4
Shutdown Current vs Temperature
30
25
20
15
10
V_IN = 32V
5
0
–50 –25
V_IN = 12V
V_IN = 5V
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G03
Quiescent Current vs Temperature
(Constant Frequency Mode)
10
9
V_IN = 12V
8
f_OSC = 500kHz
7
6
5
4
f_OSC = 200kHz
3
2
f_OSC = 50kHz
1
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G06
3260fa