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PDF AS3630 Data sheet ( Hoja de datos )
| Número de pieza | AS3630 | |
| Descripción | 8A Supercap Flash Driver | |
| Fabricantes | ams | |
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AS3630
8A Supercap Flash Driver
General Description
Figure AS3630 – 1:
Key Benefits and Features
The AS3630 is an inductive high efficient 4MHz dual DCDC step
up converter with several sources. It supports the charging of a
Supercap, its voltage balancing and a highly efficient DCDC step
up from the Supercap to the LED and from VIN to the LED to
power the flash LED with up to 8A. The AS3630 supports the
pre-charging of the Supercap (to VIN) to reduce the startup time
for the flash without reducing the lifetime of the Supercap.
The system concept supports an immediate torch function
without first charging the Supercap.
The AS3630 includes flash timeout, over- undervoltage,
overtemperature and LED short circuit protection.
The AS3630 is controlled by an I²C interface for adjustment of
the currents and timings, set the end of charge voltage and
measure the Supercap and LED parameters through the internal
ADC. A dedicated TXMASK/TORCH input can be used for a torch
button -or- reducing the battery current if a RF PA is operated
at the same time (TX Masking). A hardware enable pin -ON can
be used as a reset input.
The AS3630 is available in a space-saving WL-CSP 5x5 balls
package measuring only 2.5x2.5x0.6mm and operates over the
-30ºC to +85ºC temperature range.
Benefits
Features
Reduce Supercap size
Dual high efficiency boost converter with soft start
allows small coils
Instantaneous Torch operation for improved user
experience
Immediate Torch functions with charging of the
Supercap
Tiny external coils
4MHz fixed frequency DCDC
System Safety
10bit ADC converter for system monitoring with
Protection functions:
Automatic Flash Timeout timer to protect the LED
Overvoltage and undervoltage Protection
LED (NTC) and device Overtemperature Protection
LED short/open circuit protection
Improved thermal performance (ground = heat sink) Flash LED(s) cathode connected to ground:
8A Supercap Flash Driver
AS3630 – 1
1 page  
Pin Number
Pin Name
Description
DCDC converter 1 and 2 output capacitor - make a short
D1
VDCDC
connection to CVOUT1 and connect all VDCDC pins together as
short as possible
DCDC converter 2 switching node - make a short connection to
D2 SW2 the coil LDCDC2 and connect all SW2 pins together on top plane
D3
PGND
Power ground - connect to ground (GND) and connect all PGND
pins together on top plane
DCDC converter 1 switching node - make a short connection to
D4 SW1 the coil LDCDC1 and connect all SW1 pins together on top plane
D5
LED_OUT
Flash LED current source output and connect all LED_OUT pins
together on top plane
DCDC converter 1 and 2 output capacitor - make a short
E1
VDCDC
connection to CVOUT1 and connect all VDCDC pins together as
short as possible
DCDC converter 2 switching node - make a short connection to
E2 SW2 the coil LDCDC2 and connect all SW2 pins together on top plane
E3
PGND
Power ground - connect to ground (GND) and connect all PGND
pins together on top plane
DCDC converter 1 switching node - make a short connection to
E4 SW1 the coil LDCDC1 and connect all SW1 pins together on top plane
E5
LED_OUT
Flash LED current source output and connect all LED_OUT pins
together on top plane
1. Application Information: The pin STROBE is usually connected directly to the camera processor.
2. When SCL and SDA exchanged, the AS3630 uses a different I²C address and the functionality of SCL/SDA is also exchanged - see “I²C Address
Selection” on page 43.
3. Only input: The AS3630 does not perform clock stretching.
8A Supercap Flash Driver
AS3630 – 5
5 Page 
Symbol Parameter
Conditions
Min Typ Max Units
Averaging
ADC internal
averaging filter
Number of conversion per
measurement (averaged);
measurements can be started
immediately, at begin of flash and
end of flash - see ADC_convert
4
Protection and Fault Detection Functions
VVOUTMAX
VDCDC
overvoltage
protection
DCDC Converter Overvoltage
Protection
9.3
10.0 V
ILDCDC1
Current Limit for
coil LDCDC1 (Pin
SW1) measured at
75% PWM duty
cycle3
Set by coil1_peak
and
coil1_txmask_curr
_red during
TXMask
Range
Accuracy, ΔI
500
-10
3500 mA
+10 %
ILDCDC2
Current Limit for
coil LDCDC2 (Pin
SW1) measured at
75% PWM duty
cycle3
Set by coil2_peak
Range
Accuracy, ΔI
1000
-10
6000 mA
+10 %
VLEDSHORT
Flash LED short
circuit detection
voltage
Voltage measured on pin LED_OUT
monitored once the LED_OUT current
is at or above a minimum current -
“Short/Open LED Protection -
fault_led” on page 35
1.45
V
TOVTEMP
TOVTEMP
HYST
Overtemperature
Protection
Overtemperature
Hysteresis
tFLASHTIMEO Flash Timeout
UT Timer
Junction temperature
Set by
flash_timeout
Range
Accuracy, Δt
144 ºC
5 ºC
4
-10%
-2ms
760
+10%
+2ms
ms
VUVLO
Undervoltage
Lockout
Falling VVIN
Rising VVIN
2.3 2.4 2.5
VUVLO VUVLO VUVLO
+0.05 +0.1 +0.15
V
V
8A Supercap Flash Driver
AS3630 – 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3630.PDF ] | |
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