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Ordering number : EN0697
LB8684CL
Overview
Monolithic Digital IC
Digital Camera Motor Driver for Cell Phones
The LB8684CL is a low-voltage, low-saturation 1.5-channel constant current forward/reverse driver IC provided in a miniature package suitable for use in cell phone cameras. The LB8684CL can be driven directly from a microcontroller and is optimal for control of the voice coil motors used for shutter and aperture control in cell phone cameras.
Features
* Supports low-voltage drive. (2.2V or more) * Ultraminiature package (ECSP2828-12)
Functions
* Constant current control (IOUT = 100mA at RF = 2) * Built-in thermal protection circuit * Built-in reference voltage (0.2V typical) * Built-in spark killer diode * ENA input logic (3-port interface)
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Output voltage Input voltage Ground pin source current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VOUT max VIN max IGND Pd max Topr Tstg OUT1, OUT2, OUT3 ENA, CHSEL, IN Per channel When mounted on a circuit board * Conditions Ratings -0.3 to +8.0 VCC + VSF -0.3 to +8.0 400 450 -30 to +85 -40 to +150 Unit V V V mA mW C C
* Specified circuit board : 20.0 x 10.0 x 0.8mm3, paper-phenol
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
31407 TI PC B8-8900 No.0697-1/5
LB8684CL
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage High-level input voltage Low-level input voltage Symbol VCC VIH VIL ENA, CHSEL, IN Conditions Ratings 2.2 to 7.5 1.5 to 7.5 -0.3 to 0.5 Unit V V V
Electrical Characteristics at Ta = 25C, VCC = 3.3V
Parameter Supply current Symbol ICCO ICCO1 ICCO2 Output saturation voltage VOUT1 VOUT2 Output constant current IOUT1 IOUT2 Input current Spark killer diode Reverse current Forward voltage IS(leak) VSF1 VSF2 IOUT = 100mA IOUT = 200mA* 1 1.7 1.7 A V V IIN ENA = 0V ENA = 3V, FC = 0V ENA = 3V, RF = 2, excluding the output current, IO ENA = 3V, IOUT = 100mA ENA = 3V, IOUT = 200mA* Between REF and GND : 2 Between REF and GND : 1* VIN = 3V 95 190 Conditions min Ratings typ 0.1 3.8 5.5 0.2 0.41 100 200 50 max 1 5.5 8.0 0.3 0.6 105 210 70 A mA mA V V mA mA A Unit
* Design guarantee: These characteristics are design targets and are not measured.
Package Dimensions
unit:mm (typ) 3324
TOP VIEW 2.8 SIDE VIEW 0.4 BOTTOM VIEW (0.425) 2 0.8 SIDE VIEW (0.8) 0.8 1 1 2.8 0.35 2 0.015
SANYO : ECSP2828-12
0.65
No.0697-2/5
LB8684CL
Pin Assignment
OUT1 VCC
500 450 400
Pd max - Ta
Specified circuit board : 20.0x10.0x0.8mm3 paper-phenol board
CHSEL
1
12
11
10
RSE
Allowable power dissipation, Pd max - mW
ENA
2
9
RFG
300
LB8684CL
IN 3 8 OUT2
234 200
100
NC
4
5
6
7
OUT3
0 - 30
0
30
60
85 90
Ambient temperature, Ta - C
FC GND
Top View
Block Diagram
Shutter OUT1 VCC 1F ENA
Reference voltage
Iris OUT2 OUT3
0.2V + Constant current control amplifier
CPU
CHSEL
Logic block
IN
Thermal protection circuit GND FC 0.001F to 0.1F RSE RFG RF
[Constant current formula] IOUT = 0.2 / RF
Example : If IO is 100mA, RF will be 2.
Usage Notes : The set current is determined, as described by the above equation, by the resistor RF inserted between the RFG pin and ground.
Truth Table
Input ENA Low CHSEL x Low High High IN x Low High Low High OUT1 - High Low - - Output OUT2 - Low High Low High OUT3 - - - High Low Aperture Shutter Notes Standby Forward Reverse Forward Reverse
Note: "-" indicates the output off state. (high-impedance)
No.0697-3/5
LB8684CL
Timing Chart
ENA Standby
Standby
Operate
CHSEL OUT1/OUT2 drive OUT2/OUT3 drive
IN
OUT1
OUT2
OUT3
* * * * *
The LB8684CL will be in standby mode when ENA is low and in normal operating mode when ENA is high. CHSEL selects OUT1/OUT2 drive when low, and OUT2/OUT3 drive when high. The IN pin is used for forward/reverse switching. The broken line (----) indicates the off state. During either OUT1/OUT2 or OUT2/OUT3 drive, the output high side transistor will be saturated and the low side transistor will not be saturated. Note that the output current is a constant current.
No.0697-4/5
LB8684CL
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This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. PS No.0697-5/5

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