AS3647 Datasheet, PDF (7/38 Pages) ams AG – 1600mA High Current LED Flash Driver

AS3647/47B
Datasheet, Confidential - Electrical Characteristics
6 Electrical Characteristics
VVIN = +2.7V to +4.4V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB =
+25ºC, unless otherwise specified.
Table 4. Electrical Characteristics
Symbol
Parameter
Condition
Min Typ Max Unit
General Operating Conditions
VVIN
Supply Voltage
pin VIN
2.7
lid VVINREDUCE
D_FUNC
Supply Voltage
AS3647/47B functionally working, but not all ^2.5
parameters fulfilled
4.4
a ^{ISHUTDOWN Shutdown Current}
TXMASK/TORCH=L, SCL=SDA=0V,
VVIN<3.7V
v ^ISTANBY
Standby Current
interface active, TXMASK/TORCH=L,
VVIN<3.7V¹
ill ^TAMB
Operating
Temperature
-30
t ^Eta
Application Efficiency
(DCDC and current
sink)
LCOIL=0.6µH@3A, LESR=60m,
LED_OUT1,2=1300mA², tFLASH<300ms
G _{s DCDC Step Up Converter}
DCDC Boost output
A ^{t VVOUT}
Voltage
2.8
(pin VOUT1/2)
s _en VVOUT5V
DCDC Boost output
Voltage
(pin VOUT1/2)
constant voltage mode operation
const_v_mode (see page 25)=1
m ^{t RPMOS}
On-resistance
DCDC internal PMOS switch
RNMOS
On-resistance
DCDC internal NMOS switch
a ⁿ _fCLK
Operating Frequency
All internal timings are derived from this
oscillator
-7.5%
o _{Current Sinks}
c _VLED
LED forward voltage
single LED at 1600mA
2.8
l ILED_OUT
LED_OUT1/2 current
sinks output combined
single LED
0
a _{ILED_OUT}
LED_OUT1/2 current
sink accuracy
ILED_OUT>=800mA or ILED_OUT<500mA
0ºC < TJ < 100ºC
-7
ic^{500mA<ILED_OUT<800mA, 0ºC < TJ < 100ºC -5}
ILED_OUT
n ^RAMP
LED_OUT1/2 ramp
time
Ramp-up During startup
Ramp-down
ILED_OUT
h ^RIPPLE
LED_OUT current
ripple
ILED_OUT = 1000mA, BW=20MHz
c VILED_COMP
LED_OUT current
sink voltage
compliance
Minimum voltage between pin LED_OUT1/2
and GND for operation of the current sink
e _{VHIGH_VDS Comparator High VDS low vds and high vds comparator - see 4MHz/}
T^{VLOW_VDS Comparator Low VDS 1MHz Operating Mode Switching on page 13}
3.7 4.4
V
2.7
V
5.5
0.6 2.0 µA
1.0 10 µA
25 85 ºC
84
%
5.5
V
5.0
V
70
m
70
m
4.0 +7.5% MHz
3.5 4.2
V
1600 mA
+7
%
+5
%
250 1000 µs
500 1000 µs
20
mAPP
325
mV
900
mV
320
ILEAK_
LED_OUT
LED_OUT1/2
Leakage Current
Pins LED_OUT1 and LED_OUT2
-1.0 0.0 +1.0 µA
Protection and Fault Detection Functions (see page 13)
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