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PDF AS3681 Data sheet ( Hoja de datos )

Número de pieza AS3681
Descripción Power and Lighting Management Unit
Fabricantes austriamicrosystems　
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austriamicrosystems
AS3681
Power and Lighting Management Unit
Data Sheet
1 General Description
The AS3681 is a highly-integrated CMOS Power and Light-
ing Management Unit to supply power to LCD-and camera-
modules in mobile telephones, and other 1-cell Li+ or 3-cell
NiMH powered devices.
The AS3681 incorporates one low-power, low-dropout reg-
ulator (LDO), one Step Up DC/DC Converter for white
backlight LEDs, one high-power Charge Pump for camera
flash LEDs, one Analog-to-Digital Converter, support for up
to 11 current sinks, a serial interface, and control logic all
onto a single die.
The linear analog regulator features extremely high analog
performance regarding:
! Noise (< 30µVrms from 100Hz to 100kHz)
! Line/load Regulation
(<1mV Static and <20mV Transient)
! Power Supply Rejection (>70dB@1kHz)
! Ultra-Low Power Consumption
(1µA Shutdown, 6µA Standby)
LDO output voltages and output currents are programma-
ble via a serial interface.
2 Key Features
! Programmable High-Performance Regulator
- Low-Noise LDO (1.85 to 3.4V, 150mA)
- 2.8V Default Output Voltage after Power-up
- 3µA Quiescent Current in Standby (Iout <5mA)
- Turns On/Off with Rising/Falling Edge of GPIO
Supply Voltage
- Programmable via Serial Interface
! High-Efficiency Step Up DC/DC Converter
- Up to 25V/50mA for White LEDs
- Programmable Output Voltage with External Resistors
and Serial Interface
! High-Efficiency High-Power Charge Pump
- 1:1, 1.5:1, and 2:1 Mode
- Output Current up to 400mA
- Efficiency up to 95%
- Only 4 External Capacitors Required:
2 x 1µF Flying Capacitors, 2 x 2.2µF Input/Output
Capacitors
- Supports LCD White Backlight LEDs,
Camera Flash White LEDs, and Keypad Backlight
LEDs
! Supports up to 11 Current Sinks
- Three Programmable (4-bit) from: 10 to 300mA
- Two Programmable (4-bit) from: 2.5 to 37.5 mA
- Three Programmable (4-bit) from: 2.5 to 37.5 mA for
RGB LEDs
- Three Programmable (4-bit) from: 2.5 to 37.5mA for
General Purpose Applications
- Programmable Hardware Control (Strobe, PWM)
- Selectively Enable/Disable Current Sinks
! 10-bit Successive Approximation ADC
- 11µs Conversion Time
- Two Selectable Inputs: GPIO0 and GPIO1
! Four General Purpose Inputs/Outputs
- Digital Input, Digital Output, and Tristate
- Programmable Pull-Up, and Pull-Down
- GPIO2 can be used as Camera Flash Strobe
! Negative or High-Voltage Charge Pump
- Regulated Output Voltage, Programmable by Dual
Resistors e.g. -6V, 10mA for OLED or ±15V, 5mA for
TFT
- ±5% Accuracy
- Requires Few External Components
! Standby LDO
- Regulated 2.5V
- Maximum Output Current 10mA
- Always On (Supplies Internal Digital Blocks)
- 3µA Quiescent Current
! Wide Battery Supply Range: 3.0 to 5.5V
! Serial Interface Control
! On-Chip Bandgap Tuning for High Accuracy (±1%)
! Overcurrent and Thermal Protection
! 32-Pin, Small Form-Factor QFN Package
(5 x 5 x 1mm, 0.5mm pitch), Enhanced Thermal Charac-
teristics
! 1 Watt Power Dissipation @ TAMB = 70ºC
3 Application
Power- and lighting-management for mobile telephones
and other 1-cell Li+ or 3-cell NiMH powered devices.
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Revision 2.07
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AS3681 pdf
AS3681
Data Sheet
austriamicrosystems
Contents
1 General Description ................................................................................................................................ 1
2 Key Features .......................................................................................................................................... 1
3 Application .............................................................................................................................................. 1
4 Block Diagrams ...................................................................................................................................... 2
5 Absolute Maximum Ratings (Non-Operating) ......................................................................................... 6
5.1 Operating Conditions ....................................................................................................................................... 6
6 Detailed Functional Descriptions ............................................................................................................ 7
6.1 Analog LDO ..................................................................................................................................................... 7
6.1.1 LDO Registers ....................................................................................................................................... 8
6.2 Step Up DC/DC Converter ............................................................................................................................ 10
6.2.1 Feedback Selection ............................................................................................................................. 11
6.2.2 Voltage Feedback ............................................................................................................................... 12
6.2.3 PCB Layout Tips ................................................................................................................................. 12
6.2.4 Step Up DC/DC Converter Registers .................................................................................................. 13
6.2.5 Efficiency of 15V Step Up DC/DC Converter ...................................................................................... 14
6.3 Charge Pump ................................................................................................................................................ 15
6.3.1 Charge Pump Registers ...................................................................................................................... 17
6.3.2 Efficiency of Charge Pump with Resistive Loads ................................................................................ 18
6.4 Efficiency of Charge Pump with LED Loads .................................................................................................. 18
6.5 Current Sinks ................................................................................................................................................. 19
6.5.1 High-Voltage Current Sinks CURR1 and CURR2 (37.5mA) ................................................................ 19
6.5.2 High-Voltage Current Sink Registers .................................................................................................. 20
6.5.3 Low-Voltage Current Sink CURR3x (3x300mA) ................................................................................... 21
6.5.4 Low Voltage Current Sink Registers ................................................................................................... 21
6.5.5 Preview and Strobe Operations .......................................................................................................... 23
6.5.6 RGB Current Sinks (37.5mA) .............................................................................................................. 25
6.5.7 RGB Current Sink Registers ............................................................................................................... 25
6.5.8 General Purpose Current Sinks (37.5mA) .......................................................................................... 27
6.5.9 General Purpose Current Sink Registers ............................................................................................ 27
6.6 External Charge Pump .................................................................................................................................. 29
6.6.1 Charge Pump Registers ...................................................................................................................... 33
6.7 General Purpose Inputs/Outputs ................................................................................................................... 34
6.7.1 GPIO Characteristics .......................................................................................................................... 35
6.7.2 GPIO Registers ................................................................................................................................... 35
6.8 Analog-to-Digital Converter ........................................................................................................................... 38
6.8.1 ADC Registers .................................................................................................................................... 38
6.9 Power-On Reset ............................................................................................................................................ 40
6.9.1 Reset Control ...................................................................................................................................... 40
6.10 Temperature Supervision ............................................................................................................................ 41
6.10.1 Temperature Supervision Registers .................................................................................................. 41
6.11 Serial Interface ............................................................................................................................................. 42
6.11.1 Serial Interface Features ................................................................................................................... 42
6.11.2 Device Address Selection ................................................................................................................. 42
7 Register Map ........................................................................................................................................ 45
8 External Components ........................................................................................................................... 46
8.1 Capacitor Selection ....................................................................................................................................... 46
8.2 Diode Selection ............................................................................................................................................. 46
8.3 Inductor Selection .......................................................................................................................................... 46
8.4 Transistor Selection ....................................................................................................................................... 46
8.5 Resistor Selection ......................................................................................................................................... 46
8.6 External Component Specifications ............................................................................................................... 47
9 Pinout and Packaging ........................................................................................................................... 48
9.1 Pin Descriptions ............................................................................................................................................ 48
9.2 Package Drawings and Markings .................................................................................................................. 50
10 Ordering Information ........................................................................................................................... 52
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Revision 2.07
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AS3681 arduino
AS3681
Data Sheet
austriamicrosystems
Step Up DC/DC Converter
Table 4. Step Up DC/DC Converter Parameters
Symbol
Parameter
Min
L Inductor
tMIN_ON
MDC
Minimum on Time
Maximum Duty Cycle
TYP
10
130
91
Max
Unit Note
µH
Use inductors with small Cparasitic
(<100pF) to get high efficiency.
ns
% Guaranteed per design.
6.2.1 Feedback Selection
Register 12 (page 13) selects the type of feedback for the Step Up DC/DC Converter.
The feedback for the DC/DC converter can be selected either by current sinks CURR1 or CURR2 (see Figure 5 on
page 10) or by a voltage feedback at pin DCDC_FB (see Figure 6). Bit step_up_res (page 13) should be set to 0 in both
modes.
Setting step_up_fb (page 13) = 01 enables feedback at pin 19 (CURR1); setting step_up_fb = 10 enables feedback at
pin 20 (CURR2). 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 higher voltage drop as feedback to guarantee adequate supply for the other
(unregulated) path.
Figure 6. Step Up DC/DC Converter Block Diagram; Option: Regulated Output Voltage, Feedback is at Pin
DCDC_FB
CLK
Comparator
+–
+
Ramp
Generation
MUX
Current
Sense +
-
PWM
Logic
Driver
24 SENSE_P
R2 (RSENSE)
0.15Ω/5%
C2
1µF
23 SENSE_N
10µH, 5x5x1.2mm
L1 Coiltronics SD12-100
Q1
Si1304
SOT-323
28 DCDC_GATE
D1
R3
1MΩ
C10
1.5nF
Pulse Skip
Comparator
-
+
-
+ 1.25V
Error Amplifier
-
+ 0.5V
Error Amplifier
-
+ 0.5V
Error Amplifier
MUX
29 DCDC_FB
19 CURR1
20 CURR2
R4
100kΩ
C11
15nF
VSS
Battery
White
LEDs
C9
2.2µF
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