ltc4069edc-trpbf Linear Technology Corporation, ltc4069edc-trpbf Datasheet - Page 15

• Manufacturer Part Number: ltc4069edc-trpbf
• Description: Standalone 750ma Li-ion Battery Charger In 2 X 2 Dfn With Ntc Thermistor Input
• Manufacturer: Linear Technology Corporation

PACKAGE DESCRIPTIO
APPLICATIO S I FOR ATIO
NTC Trip Point Error
When a 1% resistor is used for R
40°C trip point is determined by the tolerance of the NTC
thermistor. A typical 100k NTC thermistor has ±10%
tolerance. By looking up the temperature coefficient of the
thermistor at 40°C, the tolerance error can be calculated in
degrees
NTHS0603N01N1003J thermistor, which has a tempera-
ture coefficient of –4%/°C at 40°C. Dividing the tolerance
by the temperature coefficient, ±5%/(4%/°C) = ±1.25°C,
gives the temperature error of the hot trip point.
R
R
2.50 ±0.05
NOM
1
=
=
= 604
10
=
1.15 ±0.05
8 8 8 87
3 266 0 5325
k
R
. , .
.
•
COLD
k
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
⎛
⎝ ⎜
Ω
centigrade.
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
3 26
TOP AND BOTTOM OF PACKAGE
0.61 ±0.05
,
(2 SIDES)
.
−
604
−
0 5325
R
.
6 6 0 5325
k is
.
HOT
−
is the nearest
U
.
the nearest
=
U
1.42 ±0.05
(2 SIDES)
10
⎞
⎠ ⎟
k
Consider
• .
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3 266 0 5325
• .
(
.
(
2 816 0 4086
HOT
0.50 BSC
2 816 0
1
1
%
%
W
, the major error in the
−
0.25 ± 0.05
0.675 ±0.05
value
U
value
−
−
.
PACKAGE
OUTLINE
.
. 4 4 086
.
.
the
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
(SEE NOTE 6)
U
)
)
−
TOP MARK
PIN 1 BAR
Vishay
0 4086
.
0.200 REF
DC Package
The cold trip point error depends on the tolerance of the
NTC thermistor and the degree to which the ratio of its
value at 0°C and its value at 40°C varies from 6.14 to 1.
Therefore, the cold trip point error can be calculated using
the tolerance, TOL, the temperature coefficient of the
thermistor at 0°C, TC (in %/°C), the value of the thermistor
at 0°C, R
R
For example, the Vishay NTHS0603N01N1003J thermistor
with a tolerance of ±5%, TC of –5%/°C and R
6.13, has a cold trip point error of:
Temperature Error C
Temperature Error C
HOT
. The formula is:
0.75 ±0.05
COLD
2.00 ±0.10
(4 SIDES)
, and the value of the thermistor at 40°C,
0.00 – 0.05
( )
( )
° =
° =
= −
0.56 ± 0.05
(2 SIDES)
0 95
⎛
⎝ ⎜
⎛
⎜ ⎜
⎝
R = 0.115
.
+ 1
1 0 05
BOTTOM VIEW—EXPOSED PAD
+
6 14
6 14
.
°
TYP
.
TOL R
C
.
, .
1.37 ±0.05
1 05
(2 SIDES)
3
4
•
• .
6 13 1
R
−
°
TC
COLD
C
5
HOT
6
1
0.50 BSC
LTC4069
0.38 ± 0.05
−
COLD
0.25 ± 0.05
− −
PIN 1
CHAMFER OF
EXPOSED PAD
⎞
⎠ ⎟
1
⎞
⎠ ⎟
• 100
/R
15
(DC6) DFN 1103
•
HOT
100
4069fa
of