LT6660HCDC-5#TRPBF Linear Technology, LT6660HCDC-5#TRPBF Datasheet - Page 9

• Manufacturer Part Number: LT6660HCDC-5#TRPBF
• Description: IC PREC SERIES REF 5V 3-DFN
• Manufacturer: Linear Technology

Specifications of LT6660HCDC-5#TRPBF

• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±0.2%
• Temperature Coefficient: 20ppm/°C
• Voltage - Input: 5.9 ~ 20 V
• Number Of Channels: 1
• Current - Quiescent: 200µA
• Current - Output: 40mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 3-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Cathode: -

APPLICATIO S I FOR ATIO
Table 1 gives the maximum output capacitance for vari-
ous load currents and output voltages to avoid instability.
Load capacitors with low ESR (effective series resistance)
cause more ringing than capacitors with higher ESR such
as polarized aluminum or tantalum capacitors.
Table 1. Maximum Output Capacitance
Long-Term Drift
Long-term drift cannot be extrapolated from accelerated
high temperature testing. This erroneous technique
gives drift numbers that are wildly optimistic. The only
way long-term drift can be determined is to measure it
over the time interval of interest. The LT6660 long-term
drift data was taken on over 100 parts that were soldered
into PC boards similar to a “real world” application. The
boards were then placed into a constant temperature oven
with T
measured with an 8.5 digit DVM. Figure 5 shows typical
long-term drift of the LT6660s.
VOLTAGE
OPTION
2.5V
3.3V
10V
3V
5V
A
= 30°C, their outputs were scanned regularly and
–100
–150
– 50
I
150
100
OUT
50
0
>10µF
>10µF
>10µF
>10µF
>10µF
0
= 100µA
Figure 5. Typical Long-Term Drift
100
200
U
300
I
OUT
400
>10µF
>10µF
>10µF
>10µF
1µF
HOURS
U
= 1mA
500
600
700
I
OUT
W
800
0.15µF
2µF
2µF
1µF
1µF
= 10mA
900
6660 F05
1000
I
U
OUT
0.68µF
0.68µF
0.68µF
0.68µF
0.1µF
= 20mA
Hysteresis
Hysteresis data shown in Figure 6 and Figure 7 represents
the worst-case data taken on parts from 0°C to 70°C and
from –40°C to 85°C. The output is capable of dissipat-
ing relatively high power, i.e., for the LT6660-2.5, P
17.5V • 20mA = 350mW. The thermal resistance of the
DFN package is 102°C/W and this dissipation causes a
36°C internal rise. This elevated temperature may cause
the output to shift due to thermal hysteresis. For highest
performance in precision applications, do not let the
LT6660’s junction temperature exceed 85°C.
Input Capacitance
It is recommended that a 0.1µF or larger capacitor be
added to the input pin of the LT6660. This can help with
stability when large load currents are demanded.
12
18
16
14
10
6
5
4
2
8
6
4
0
9
8
7
3
1
0
2
–600
–240
WORST-CASE HYSTERESIS
ON 34 UNITS
WORST-CASE HYSTERESIS
ON 40 UNITS
–500
–200
Figure 7. – 40°C to 85°C Hysteresis
–400
–160
Figure 6. 0°C to 70°C Hysteresis
85°C TO 25°C
–300
–120
70°C TO 25°C
–200
– 80
HYSTERESIS (ppm)
HYSTERESIS (ppm)
–100
–40
0
0
100
40
0°C TO 25°C
–40°C TO 25°C
200
80
300
120
LT6660
400
160
200
500
6660 F07
6660 F06
600
240
6660fa
9
D
=