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AS3644 bảng dữ liệu(PDF) 5 Page - ams AG

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AS3644 bảng dữ liệu(HTML) 5 Page - ams AG

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AS3644
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VVIN = +2.7V to +5.5V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB =
+25ºC, unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
General Operating Conditions
VVIN
Supply Voltage
2.7
3.7
4.5
V
VVINREDUCE
D_FUNC
Supply Voltage
AS3644 functionally working, but not all
parameters fulfilled
1
2.5
5.0
V
ISHUTDOWN
Shutdown Current
SCL=L, SDA=L, VVIN<3.7V,
0ºC < TAMB < 50ºC
0.5
1.0
µA
ISTANBY
Standby Current
interface active, VVIN<3.7V
0.5
5
µA
TAMB
Operating
Temperature
-30
25
85
ºC
DCDC Step Up Converter
VVOUT
DCDC Boost output
Voltage (pin VOUT)
For high supply voltages the output voltage can
reach up to VVOUTMAX (the AS3644 always
runs in PWM mode unless VVOUT>VVOUTMAX
or during startup)
2.8
4.7
V
Eta
Efficiency
ILED_OUT=300mA,VVOUT=4.2V
82
%
fCLK
Operating Frequency
All internal timings are derived from this
oscillator
-7.5%
4.0
+7.5%
MHz
DCDC operating frequency for short pulses
(close to 100% operating mode)
-7.5%
1.0
+7.5%
Current Source
ILED_OUT
LED_OUT current
source output
51.6
320
mA
ILED_OUT
LED_OUT current
source accuracy
ILED_OUT=300mA or 72.3mA
-7
+7
%
ILED_OUT
RAMP
LED_OUT ramp time
at ILED_OUT=300mA
Ramp-up During startup
0.6
1.0
ms
Ramp-down after AS3644 is disabled by
interface
0.2
0.7
ms
ILED_OUT
RIPPLE
LED_OUT current
ripple
ILED_OUT = 300mA
10
mAPP
VILED_COMP
LED_OUT current
source voltage
compliance
Minimum voltage between pin VOUT and
LED_OUT for operation of the current source
210
350
mV
Protection and Fault Detection Functions (see page 9)
VVOUTMAX
VVOUT overvoltage
protection
DCDC Converter Overvoltage Protection
5.0
5.25
5.5
V
ILIMIT
Current Limit for coil
LDCDC (Pin SW)
measured at 50%
PWM duty cycle
2
maximum 40000s lifetime operation in
overcurrent limit
0.7
0.8
0.9
A
VLEDSHORT
Flash LED short
circuit detection
voltage
Voltage measured on pin LED_OUT
1.45
1.65
V



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