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PDF AS3677 Data sheet ( Hoja de datos )
| Número de pieza | AS3677 | |
| Descripción | Triple Channel Lighting Management Unit | |
| Fabricantes | austriamicrosystems | |
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Datasheet
AS3677
Triple Channel Lighting Management Unit with DCDC step/up,
ALS, 2xDLS(=DBC) and RGB Driver
1 General Description
2 Key Features
The AS3677 is a highly-integrated CMOS Power and
Lighting Management Unit for mobile telephones, and
other Li+ battery powered devices.
The AS3677 incorporates one Step Up DC/DC Con-
verter for white backlight LEDs one Analog-to-Digital
Converter, six current sinks, LED in-circuit function test,
an I2C serial interface, and control logic all onto a single
device. It includes a charge pump to control e.g. an RGB
together with an internal pattern generator for smooth
blinking effects.
It supports ambient light sensor processing and two
Dynamic Luminance Scaling (DLS) (also called
Dynamic Backlight Control - DBC) input.
Internally the PWM signal for DLS can be used to
change the analog current through the current sources
(two channels can be used simultaneously). This avoids
noise in the system as the changes of backlight control
happen continuously without using the PWM modulation
scheme.
Output voltages and output currents are fully program-
mable.
The AS3677 is part of the austriamicrosystems AS3675,
AS3687/87XM, AS3688 and AS3689 lighting manage-
ment unit family. It is software compatible to AS3675,
AS3676, AS3687/87XM, AS3688 and AS3689.
The AS3677 is available in a space-saving WL-CSP
package measuring only 2.2x2.2x0.6mm and operates
over the -30ºC to +85ºC temperature range.
Figure 1. Function Diagram
AS3677
High-Efficiency Step Up DC/DC Converter
- Up to 25V, up to 50mA for White LEDs
- Programmable Over voltage Protection
(10V, 16V or 25V)
50mA Charge Pump
- 1:1 and 1:2 Mode with automatic Up Switching
- Only 2 External Capacitors Required
6 Current Sinks
- Fully Programmable (8-bit) from: 0.1mA to 25.5mA
- 3xHigh Voltage capable (up to 25V)
- 3xLow voltage for use with the CP (up to 5.5V)
- Selectively Enable/Disable Current Sinks
- Dual Dynamic Luminance Scaling (DLS) support to
improve backlight operating time (can adjust any
current source)
- Light Sensor input with internal hardware process-
ing to control backlight according to ambient light
using 3 groups
Internal PWM Generation
- 8 Bit resolution
- Autonomous Logarithmic up/down dimming
Led Pattern Generator
- Autonomous driving of Fun RGB or indicator LEDs
10-bit Successive Approximation ADC
- 27µs Conversion Time
- Selectable Inputs: VANA, DLS1, DLS2, ALS/
GPIO1, GPIO2, CURR1, CURR2, CURR6, VBAT,
RGB1, RGB2 and RGB3
- Internal Temp. Measurement
- Light Sensor input with Java support (JSR-256):
read ADC processed value
Support for automatic LED testing (open and
shorted LEDs can be identified)
Programmable LDO
- 1.8 to 3.35V, 10mA
- Programmable via Serial Interface
Wide Battery Supply Range: 3.0V to 5.5V
I2C Serial Interface Control with address control pin
Over current and Thermal Protection
Package
WL-CSP25, 2.2x2.2x0.6mm, 0.4mm pitch
3 Applications
Lighting Management Unit for mobile phones, smart-
phones, PMP or PND
www.austriamicrosystems.com/AS3677
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1 page  
AS3677
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Table 3, “General
Operating Conditions; typical values are at VBAT=3.7V and 25ºC,” on page 5 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Min Max Units
Comments
VIN_HV
26V Pins
-0.3 26
Applicable for high-voltage
V current sink pins CURR1,
CURR2, CURR6, SW
VIN_MV
VIN_LV
5V Pins
3.3V Pins
-0.3 7.0
-0.3 5.0
Applicable for 5V pins
VBAT, VBAT_CP, CLK,
V DATA, ADR, RGB1, RGB2,
RGB3, CPOUT, C1_P, C1_N,
INT
Applicable for 3.3V pins
V ALS/GPIO1, GPIO2, GPIO3,
DLS1, DLS2, VANA
GND pins
0.0 0.0
V
2xVSS, VSS_DCDC
Input Pin Current without causing
latchup
-25
+25
mA At 25ºC, Norm: EIA/JESD78
Tstrg
Storage Temperature Range
-55 125 ºC
IIN
Humidity
5 85 %
Non-condensing
HBM
-2000 2000
V
Norm: JESD22-A114F
VESD
CDM
-500
500
V
Norm: JEDEC JESD 22-
C101E
MM
-100
100
V
Norm: JEDEC JESD 22-
A115-B
Pt
TBODY
Total Power Dissipation
Peak Body Temperature
0.75
W
TA = 70 ºC, Tjunc_max =
125ºC; RTHJU=73 K/W
260
ºC
T = 20 to 40s, in accordance
with IPC/JEDEC J-STD 020.
MSL
Moisture sensitivity level
1
Represents a max. floor life
time of unlimited
6 Electrical Characteristics
Table 3. General Operating Conditions; typical values are at VBAT=3.7V and 25ºC
Symbol
Parameter
Condition
Min Typ Max Unit
VHV
High Voltage
Applicable for high-voltage current sink pins
CURR1, CURR2 and CURR6.
0.0
26.0 V
VBAT
Battery Voltage
Pin VBAT, VBAT_CP
3.0 3.7 5.5
V
VPERI
Periphery Supply
Voltage
For serial interface pins.
1.5 5.5 V
TAMB
Operating
Temperature Range
-30 25 85 ºC
IACTIVE
Battery current
Normal Operating current (see Operating
Modes on page 58)
110 µA
ISTANDBY Standby Mode Current
Current consumption in standby mode.
Interface active
10 15 µA
www.austriamicrosystems.com/AS3677
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5 Page 
AS3677
Datasheet - Detailed Description
Table 7. Step Up DC/DC Converter Parameters (Continued)
Symbol
Parameter
Condition
Feedback Voltage for
VFB
Current Sink
on CURR1, CURR2 or CURR6 in regulation.
Regulation
step_up_lowcur=0
ICOIL_MAX
Coil current limit
step_up_lowcur=1
For fixed startup time of step_up_lowcur=0
500us
step_up_lowcur=1
RSW
Switch Resistance ON-resistance of external switching transistor.
ILOAD
Load Current
At 25V output voltage
fIN Switching Frequency
Internally trimmed
COUT
Output Capacitor
Ceramic, ±20%. Use nominal 4.7µF capacitors
to obtain at least 0.7µF under all conditions
(voltage dependence of capacitors)
L
Inductor
Use inductors with small Cparasitic (<100pF) to
get high efficiency.
tMIN_ON
Minimum on Time
MDC Maximum Duty Cycle
Vripple
Voltage ripple >20kHz
Cout=4.7µF,Iout=0..45mA, VBAT=3.0...4.2V
Voltage ripple <20kHz
Efficiency
Efficiency
Iout=20mA,Vout=17V,VBAT=3.8V
Min
0.4
0
0.9
0.7
7
90
90
Typ Max
0.5 0.6
1200
750
600
330
0.42
1
1.0
50
1.1
4.7
10 13
140 190
160
40
85
Unit
V
mA
Ω
mA
MHz
µF
µH
ns
%
mV
mV
%
To ensure soft startup of the dcdc converter, the over current limits are reduced for a fixed time after enabling the dcdc
converter. The total startup time for an output voltage of e.g. 26V is less than 2ms.
8.2.1 Feedback Selection
Register DCDC control1 and DCDC control2 selects the type of feedback for the Step Up DC/DC Converter.
The feedback for the DC/DC converter can be selected to any of the current sinks (CURR1, CURR2, CURR6). If the
register bit step_up_fb_auto is set, the feedback path is automatically selected between CURR1, CURR2 and CURR6
(the lowest voltage of these current sinks is used)1. The Step Up DC/DC Converter is regulated such that the required
current at the feedback path can be supported.
Note: Always choose the path with the highest voltage drop as feedback to guarantee adequate supply for the other
(unregulated) paths or enable the register bit step_up_fb_auto.
8.2.2 Over voltage Protection
The over voltage protection is controlled by the register step_up_vmax (can be programmed to 10V, 16V or 25V) to
protect the external components (especially the output capacitor C1. If the voltage on the pin SW exceeds this voltage,
the DCDC is immediately disabled and the register bit step_up_ov is set. To re-enable the DCDC set step_up_on=0
and afterwards step_up_on=1.
The voltage rating of the external components must be chosen to fit to the software setting of step_up_vmax2.
Note: The voltage on CURR1, CURR2 and CURR6 must not exceed 26V (see page 20)
1. It is recommended to leave step_up_fb_auto=1 (default) all the times.
2. If the voltage is the DCDC overvoltage protection is chosen above the voltage ratings of the external com-
ponents, permanent damage might result.
www.austriamicrosystems.com/AS3677
1v3-1
11 - 67
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3677.PDF ] | |
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