ADP1650CB-EVALZ Analog Devices Inc, ADP1650CB-EVALZ Datasheet

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ADP1650CB-EVALZ

Manufacturer Part Number
ADP1650CB-EVALZ
Description
LED Flash Driver Eval. Board
Manufacturer
Analog Devices Inc
Datasheets

Specifications of ADP1650CB-EVALZ

Core Chip
ADP1650
Topology
Boost
Output Current
1.5A
No. Of Outputs
1
Input Voltage
2.7V To 5V
Kit Contents
Board
Development Tool Type
Hardware - Eval/Demo Board
Mcu Supported Families
ADP1650
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Ultracompact solution
High efficiency: 90% peak
I
Control
Safety
APPLICATIONS
Camera-enabled cellular phones and smart phones
Digital still cameras, camcorders, and PDAs
GENERAL DESCRIPTION
The ADP1650 is a very compact, highly efficient, single white
LED flash driver for high resolution camera phones that
improves picture and video quality in low light environments.
The device integrates a programmable 1.5 MHz or 3 MHz
synchronous inductive boost converter, an I
interface, and a 1500 mA current source. The high switching
frequency enables the use of a tiny, 1 mm high, low cost, 1 μH
power inductor, and the current source permits LED cathode
grounding for thermally enhanced, low EMI, and compact
layouts.
The LED driver maximizes efficiency over the entire battery
voltage range to maximize the input-power-to-LED-power
conversion and to minimize battery current draw during flash
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
2
C programmable
Small, 2 mm × 1.5 mm, 12-ball WLCSP package
Thin, 3 mm × 3 mm × 0.75 mm, 10-lead LFCSP package
Smallest footprint, 1 mm height, 1 μH power inductor
LED current source for local LED grounding
Synchronous 3 MHz PWM boost converter, no external diode
Reduces high levels of input battery current during flash
Limits battery current drain in torch mode
Currents up to 1500 mA in flash mode for 1 LED with
Currents up to 200 mA in torch mode
Programmable dc battery current limit (4 settings)
Programmable flash timer up to 1600 ms
Low VBAT mode to reduce LED current automatically
4-bit ADC for LED V
I
External STROBE and torch input pins
2 transmitter mask (TxMASK) inputs
Thermal overload protection
Inductor fault detection
LED short-/open-circuit protection
2
C-compatible control registers
Simplified routing to/from LED
Improved LED thermals
±7% accuracy over all conditions
F
, die/LED temperature readback
2
C-compatible
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
events. A programmable dc battery current limit safely maximizes
LED current for all LED V
Two independent TxMASK inputs permit the flash LED current
and battery current to reduce quickly during a power amplifier
current burst. The I
grammability of timers, currents, and status bit readback for
operation monitoring and safety control.
The ADP1650 is available in a compact 12-ball, 0.5 mm pitch
WLCSP package and a 10-lead LFCSP package, and operates
within specification over the full −40°C to +125°C junction
temperature range.
TX2/ILED/ADC
TX1/TORCH
1.5 A LED Flash Driver with
AREA = 16.4mm
I
L1
2
FUNCTIONAL BLOCK DIAGRAM
INDUCTOR
C-Compatible Interface
Li-ION +
©2010–2011 Analog Devices, Inc. All rights reserved.
2
Figure 2. PCB Layout (WLCSP)
C-compatible interface enables the pro-
2
GPIO1
GPIO2
STROBE
SCL
SDA
EN
F
ADP1650
and battery voltage conditions.
Figure 1.
C2
SGND
ANODE
PGND
LED
LED_OUT
INPUT VOLTAGE = 2.7V TO 5.0V
PGND
SW
1.0µH
ADP1650
Li-ION +
www.analog.com
MAX 1.5A
DIGITAL
INPUT/
OUTPUT
10µF
10µF

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ADP1650CB-EVALZ Summary of contents

Page 1

FEATURES Ultracompact solution Small × 1.5 mm, 12-ball WLCSP package Thin × × 0.75 mm, 10-lead LFCSP package Smallest footprint height, 1 μH power inductor LED current source for local LED grounding ...

Page 2

ADP1650 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Recommended Specifications: Input and Output Capacitance and Inductance ............................................................................. C-Compatible Interface Timing Specifications ...

Page 3

SPECIFICATIONS 3 −40°C to +125°C for minimum/maximum specifications, and Table 1. Parameter 2 SUPPLY Input Voltage Range Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Shutdown Current ( ...

Page 4

ADP1650 2 Parameter Pass-Through Mode Transition, Flash VIN to LED_OUT, Entry VIN to LED_OUT, Exit Pass-Through Mode Transition, Torch VIN to LED_OUT, Entry VIN to LED_OUT, Exit DIGITAL INPUTS/GPIO Input Logic Low Voltage Input Logic High Voltage GPIO1, GPIO2, STROBE ...

Page 5

RECOMMENDED SPECIFICATIONS: INPUT AND OUTPUT CAPACITANCE AND INDUCTANCE Table 2. Parameter CAPACITANCE Input Output MINIMUM AND MAXIMUM INDUCTANCE 2 I C-COMPATIBLE INTERFACE TIMING SPECIFICATIONS Table 3. 1 Parameter Min f SCL t 0.6 HIGH t 1.3 LOW t 100 SU, ...

Page 6

ADP1650 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter VIN, SDA, SCL, EN, GPIO1, GPIO2, STROBE, LED_OUT, SW, VOUT to Power Ground PGND to SGND Ambient Temperature Range ( Junction Temperature Range ( Storage Temperature ESD Human Body ...

Page 7

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS BALL A1 INDICATOR 1 2 PGND SGND A SW GPIO2 B VOUT STROBE C LED_OUT SDA D TOP VIEW (BALL SIDE DOWN) Not to Scale Figure 4. WLCSP Pin Configuration Table 6. Pin Function Descriptions ...

Page 8

ADP1650 TYPICAL PERFORMANCE CHARACTERISTICS I = inductor current LED current, LED_OUT = LED output LED LED_OUT 3 I LED STROBE 1 CH1 5V CH2 1A Ω M100µs CH3 1V CH4 500mA Ω ...

Page 9

LED_OUT I BAT 2 I LED 3 GPIO1 (TxMASK1 CH2 2V 1A Ω M40µs A CH1 CH2 1V CH4 500mA Ω CH4 T 16% Figure 12. Exit from TxMASK1 Mode 3.04 3.03 3.02 3.01 3.00 2.99 2.98 2.97 ...

Page 10

ADP1650 1111 1110 1100 1010 1000 0110 0100 0010 0000 DIE TEMPERATURE (°C) Figure 18. ADC Die Temperature Mode Transfer Characteristic 1111 1110 1100 1010 1000 0110 0100 0010 0000 2.8 3.0 3.2 3.4 3.6 3.8 ...

Page 11

3. 4.2V IN 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 – TEMPERATURE (°C) Figure 24. LED Current Error vs. Temperature, I 1.0 0.5 0 –0.5 ...

Page 12

ADP1650 THEORY OF OPERATION 2 The ADP1650 is a high power programmable white LED driver ideal for driving white LEDs for use as a camera flash. The ADP1650 includes a boost converter and a current regulator suitable for ...

Page 13

ASSIST LIGHT The assist light provides continuous current programmable from 200 mA. Set the assist light current using the I_TOR bits (in Register 0x03). To enable assist, set LED_MOD to assist light mode and set OUTPUT_EN = ...

Page 14

ADP1650 TORCH-TO-FLASH MODE The driver can move directly from external torch mode (using GPIO1) to flash mode by bringing STROBE high before GPIO1 = torch is brought low. Bringing torch low before STROBE goes high prevents the flash from firing ...

Page 15

PROGRAMMABLE BATTERY DC CURRENT LIMIT The ADP1650 has four optional programmable input dc current limits that limit the maximum battery current that can be taken over all conditions. This allows higher LED currents to be used in a system with ...

Page 16

ADP1650 initial peak as the junction temperature of the LED stabilizes. An LED temperature vs. flash time profile for the handset PCB design can be generated during the design phase by varying the FL_TIM bits from the lowest to the ...

Page 17

ON OFF 3.2 TO 5.0 MEGAPIXEL CMOS IMAGE SENSOR STROBE GPIO2 APPLICATIONS PROCESSOR SCL 2 SDA, SCL I C BUS SDA POWER-ON RESET EN GPIO1 Figure 41. ADP1650 Voltage Regulation Mode: Class-D Audio Application INPUT VOLTAGE = 2.7V TO 5.0V ...

Page 18

ADP1650 SAFETY FEATURES For critical fault conditions, such as output overvoltage, flash timeout, LED output short circuit, and overtemperature conditions, the ADP1650 has built-in protection modes critical fault occurs, OUTPUT_EN (Register 0x04) is set to 0, and the ...

Page 19

I C INTERFACE 2 The ADP1650 includes an I C-compatible serial interface for control of the LED current, as well as for readback of system 2 status registers. The I C chip address is 0x30 (0x60 in write mode ...

Page 20

ADP1650 REGISTER MAP The lowest bit number (0) represents the least significant bit, and the highest bit number (7) represents the most significant bit. Table 9. Design Information Register (Register 0x00) Bit R/W [7:0] R Table 10. ...

Page 21

Table 11. Current Set Register (Register 0x03) Bit Name Bit R/W Description I_FL [7:3] R/W Flash current value setting 00000 = 300 mA 00001 = 350 mA 00010 = 400 mA 00011 = 450 mA 00100 = 500 mA 00101 ...

Page 22

ADP1650 Table 12. Output Mode Register (Register 0x04) Bit Name Bit R/W IL_PEAK [7:6] R/W STR_LV 5 R/W FREQ_FB 4 R/W OUTPUT_EN 3 R/W STR_MODE 2 R/W LED_MOD [1:0] R/W Table 13. Fault Information Register (Register 0x05) Bit Name Bit ...

Page 23

Table 14. Input Control Register (Register 0x06) Bit Name Bit R/W I_TX2 [7:4] R/W I_TX1 [3:0] R/W Description TxMASK2 operational mode foldback current 0000 = 100 mA 0001 = 150 mA 0010 = 200 mA 0011 = 250 mA 0100 ...

Page 24

ADP1650 Table 15. Additional Mode Register, AD_MOD (Register 0x07) Bit Name Bit R/W DYN_OVP 7 R/W SW_LO 6 R/W STR_POL 5 R/W I_ILED [4:3] R/W IL_DC [2:1] R/W IL_DC_EN 0 R/W Table 16. Additional Mode Register, ADC (Register 0x08) Bit ...

Page 25

Table 17. Battery Low Mode Register (Register 0x09) Bit Name Bit R/W CL_SOFT 7 R/W I_VB_LO [6:3] R V_VB_LO [2:0] R/W Description Soft inductor peak current limit 0 = disabled (ADP1650 is disabled when the inductor peak current limit is ...

Page 26

ADP1650 APPLICATIONS INFORMATION EXTERNAL COMPONENT SELECTION Selecting the Inductor The ADP1650 boost converter increases the battery voltage to allow driving of one LED, whose voltage drop is higher than the battery voltage plus the current source headroom voltage. This allows ...

Page 27

The worst-case capacitance accounting for capacitor variation over temperature, component tolerance, and voltage is calcu- lated using the following equation × (1 − TEMPCO) × (1 − TOL) EFF OUT where the effective capacitance at ...

Page 28

ADP1650 PCB LAYOUT Poor layout can affect performance, causing electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problems, ground bounce, and power losses. Poor layout can also affect regulation and stability. Figure 45 shows optimized layouts implemented using the following guidelines: ...

Page 29

... PIN 1 INDEX AREA 0.80 0.75 0.70 SEATING PLANE ORDERING GUIDE 1 Model Temperature Range ADP1650ACBZ-R7 −40°C to +125°C ADP1650ACPZ-R7 −40°C to +125°C ADP1650CB-EVALZ ADP1650CP-EVALZ RoHS Compliant Part. 2 This package option is halide free. 0.660 0.602 0.544 0.022 SEATING REF PLANE 2.04 0.330 2 ...

Page 30

ADP1650 NOTES Rev Page ...

Page 31

NOTES Rev Page ADP1650 ...

Page 32

ADP1650 NOTES ©2010–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08837-0-4/11(C) Rev Page ...

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