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SC1437ISK-L45TR PDF даташит

Спецификация SC1437ISK-L45TR изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «Precision Voltage Detector With Programmable Trigger Voltage & Timer Delay».

Детали детали

Номер произв SC1437ISK-L45TR
Описание Precision Voltage Detector With Programmable Trigger Voltage & Timer Delay
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1437ISK-L45TR Даташит, Описание, Даташиты
SC1437
Precision Voltage Detector With
Programmable Trigger Voltage & Timer Delay
POWER MANAGEMENT
Description
Features
The SC1437 is a battery over voltage detection circuit with driver
for external MOSFET. The trip point is adjustable with an external
resistor divider connected to the SENSE pin. The trip point is
preset to a nominal trip voltage of 4.2V if no external divider is
used. Other internal trip voltages of 4.5V and 4.7V are available,
specified by different part numbers. An internal delay, with two
selectable times or bypass, is on-board to suppress accidental
over voltage conditions due to glitches on the battery supply volt-
age, V+. The delay is externally adjustable by pulling the SEL pin
high, low, or left floating. During an actual over voltage condition,
the internal driver will pull the over voltage pin (OV) down to the
voltage present at the V- pin. This insures the external N-Channel
MOSFET will be completely off during an over voltage condition.
Supply current during the monitoring mode of operation is ap-
proximately 10µA. If an over voltage condition is detected, supply
currents increase when the timer is started. A voltage comparator
will engage at voltages greater than 6.8V, which bypasses the
timer and open circuits the battery by turning off the external
MOSFET. This important function protects the battery during the
timer delay in the event of a charger failure. There are three
functional options available. With the B option the OV pin is active
low. With the L option the OV pin is active high. With the H option
the OV pin is open drain, active high. All options are available in a
5 lead SOT-23 package.
! Low quiescent current, less than 10µA typical
! Input voltage range 1.8V to 6.8V
! Adjustable or preset voltage trip point
! Selectable timer delays of 0, 40 and 80ms without use of
external resistor
! SOT-23 5 lead package
! Accuracy is 2% over specified temperature range
! 30V maximum rating
Applications
! Battery packs
! Portable electronics
! Lithium Ion protection circuits
! Programmable Fuse
! Power Monitoring
! CPU Reset Circuits
Typical Application Circuit
BATTERY
R1
R2
Revision 01/10/2001
+
100
0.1uF
1 SEL
4
SENSE
3 OV
V+ 5
V- 2
SC1437
100
0.1uF
VTRIP = 2.1(1+R2/R1)
0.476 < (R2/R1) < 2
-
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SC1437ISK-L45TR Даташит, Описание, Даташиты
POWER MANAGEMENT
Absolute Maximum Rating
Parameter
V+ Supply Voltage to (V-)
Over Voltage Output to (V-)
Select to (V-)
Sense to (V-)
Thermal Resistance Junction to Ambient
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec.
ESD Rating (Human Body Model)
SC1437
Symbol
V+
OV
SEL
SENSE
θJA
TA
TJ
TSTG
TLEAD
ESD
Maximum
-0.3 to 30
-0.3 to 8
-0.3 to 7
-0.3 to 7
256
-40 to +85
-40 to +125
-65 to +150
300
2
Units
V
V
V
V
°C/W
°C
°C
°C
°C
kV
Electrical Characteristics
Unless specified, TA = 25 OC, V+ = 1.8V to 6.3V. Values in bold apply over the full operating temperature range.
Parameter
Input Supply Voltage
Input Supply Current
Over Voltage Threshold
with Respect to V-
Symbol
V+
I+
VTRIP
Input Bias Current
OV Threshold Hystersis
IBSEN
IBSEL
hyst
OV Drive Current
Delay
OVDRV
tdelay
Clamp Voltage
Turn Off Time
Turn-Off Time
VCLMP
toff
toffbpt
Test Conditions
Battery input voltage
With internal divider; V+ = 4.7V
SENSE = V-, 4.2V Option
SENSE = V-, 4.5V Option
SENSE = V-, 4.7V Option
External Divider, VSENSE + 2.1V, VSENSE = 1V to 4.2V
Sense Pin
Select Pin
SENSE = V-, 4.2V Option
SENSE = V-, 4.5V Option
SENSE = V-, 4.7V Option
SENSE = resistor divider
B Version
H & L Version; R = 100K, V+ = 4.2V
With SEL = V+
With SEL = V-
With SEL = no connect
Step Voltage = 3V to 15V
Turn off time of external FET with gate cap = 1nF
6.8V Bypass Timer Comparator
MIN
1.8
4.12
4.41
4.61
24
48
T YP
10
4.2
4.5
4.7
2
420
450
470
VTRIP* 0.1
150
42
0
40
80
6.8
50
MAX
6.3
14
4.28
4.59
4.79
1
1
56
112
50
Units
V
µA
V
V
V
%
µA
µA
mV
uA
uA
ms
V
µsec
µsec
2000 Semtech Corp.
2
www.semtech.com









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SC1437ISK-L45TR Даташит, Описание, Даташиты
POWER MANAGEMENT
Pin Configuration
Top View
SEL 1
V- 2
5 V+
OV 3
4 SENSE
SC1437
Ordering Information
DEVICE(1)
PACKAGE
SC1437ISK-BXXTR
SOT-23-5L
SC1437ISK-HXXTR
SOT-23-5L
SC1437ISK-LXXTR
SOT-23-5L
Notes:
(1) Where XX = 42 (4.2V), 45 (4.5V), 47 (4.7V)
Only available in tape and reel packaging.
A reel contains 3,000 devices.
SOT-23-5L
Marking Information
Top Mark
7B45
Bottom Mark
yyww
7 = SC1437 Device
Output Option: B = Output active low
L = Output active high
H = Output active high, with open drain
Voltage Option: 42 = 4.2V; 45 = 4.5V; 47 = 4.7V
yy = two-digit year of manufacture
ww = two-digit week of manufacture
Pin Descriptions
Pin #
1
2
3
4
5
Pin Name
SEL
V-
OV
SENSE
V+
Pin Function
Input for timer delay selection (V+, gnd or no connect).
Negative terminal of charger.
Over-voltage output. Active low for version B. Active high for versions H & L.
Voltage divider input for adjusting over voltage trip point. Tie to V- for voltage monitor
configuration.
Input supply pin.
2000 Semtech Corp.
3
www.semtech.com










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Номер в каталогеОписаниеПроизводители
SC1437ISK-L45TRPrecision Voltage Detector With Programmable Trigger Voltage & Timer DelaySemtech Corporation
Semtech Corporation

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