QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 805
LOW NOISE HIGH CURRENT LED CHARGE PUMP
1
LTC3216
DESCRIPTION
Demonstration circuit 805 is a low noise high current
LED charge pump featuring the LTC®3216 and the
LXCL-PWF1 Lumileds Luxeon Flash. The board is op-
timized for 800mA 300ms LED flash current or
200mA constant LED torch current with a single lith-
ium ion battery input voltage range of 2.9V to 4.4V or
three AAA batteries in series. The lithium ion battery
input voltage range, high LED flash current and sepa-
rate torch mode current setting, internal charge pump
switches, inductorless solution, minimal external
components, and simple design makes the LTC3216
is the top solution for space-constrained cellular tele-
phone camera flash solutions.
DC805 comes with three AAA batteries in series to
simulate the capabilities of a typical lithium ion cellu-
lar telephone battery. This portable board is turned on
and off by pressing the ON/OFF button. A TORCH but-
ton turns the LED on at 200mA for cellular telephone
video recording. The FLASH button flashes the LED at
800mA for 300ms for cellular telephone camera flash
operation. The buttons control the state of the PIC
microcontroller IC that is programmed with DC805
software. The PIC keeps the LED from being flashed
constantly, preventing overheating and burnout. The
PIC also controls the flash time. When no buttons are
pressed for a short time, the PIC turns off and the
circuit enters low-power mode for battery-life preser-
vation.
A red/green LED indicates the state of the PIC. The
LED is ready to flash or torch if the state indicator is
blipping green. If the indicator is not on, the PIC is
turned off. For a brief time after the flash has oc-
curred, the state-indicator LED is red, indicating that
another flash cannot happen, even if the button is
pressed, until the red LED is off and the green LED is
blipping again.
The LTC3216 datasheet gives a complete description
of the part, operation and applications information.
The datasheet must be read in conjunction with this
Quick Start Guide for demonstration circuit 805. In
addition, Lumileds Luxeon Flash datasheet featuring
LXCL-PWF1 (www.lumileds.com) must be read to
understand thermal and LED current constraints for
varying flash current pulse-widths and intensity. The
LTC3216 is assembled in a small low profile DFN
package. Proper board layout is essential for maxi-
mum thermal performance. See the datasheet section
‘Layout Considerations’.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a trademark of Linear Technology Corporation
QUICK START PROCEDURE
Demonstration circuit 805 is easy to set up to evalu-
ate the performance of the LTC3216. Follow the pro-
cedure below:
NOTE:
Make sure that the input voltage does not ex-
ceed 5V if a source other than the three AAA batteries
is used.
NOTE:
If batteries are not used, do not hot-plug the
input voltage terminals VIN (+) and GND (-). The ab-
solute maximum voltage on VIN is 5V and hot-
plugging a power supply through wire leads to the
demonstration circuit can cause the voltage on the
extremely low-ESR ceramic input capacitor to ring to
twice its DC value.
See Application Note 88 for more
details.
NOTE:
Connect the three AAA batteries as indicated in
the battery pack with the polarity indicated on the
back of the PCB.
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 805
LOW NOISE HIGH CURRENT LED CHARGE PUMP
2
1.
Insert three AAA batteries in the battery pack on
the back of the PCB.
2.
If the state-indicator LED is not blipping green,
press the ON/OFF button to turn on the circuit.
3.
Press ‘FLASH’ to observe a 300ms, 800mA camera
flash on the LXCL-PWF2 LED.
4.
Press ‘TORCH’ to observe constant 200mA LED
light for recording video.
5.
Press ‘TORCH’ to turn off the 200mA video mode.
6.
Press ‘ON/OFF’ to turn off the circuit or let the cir-
cuit turn off by not pressing any buttons for ap-
proximately 10 seconds.
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
HOLDS 3 AAA CELLS IN SERIES
PC MOUNT
PLASTIC BATTERY HOLDER
KEYSTONE
A
DC805A-1* LTC3216EDE
Thursday, September 09, 2004 1 1
LOW NOISE HIGH CURRENT LED CHARGE PUMP
KIM T.
KEITH S.
A
SCHEMATIC
SIZE
DATE:
DWG NO. REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER:
DESIGNER:
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
VIN
EN1
EN2
R5
10k
LED2
LTST-C155KGJRKT
31
2 4
+LED1
LXCL-PWF1
LUMILEDS
200mA/800mA
1 2
C3
2.2uF,6.3V
0603
R4
1%
6.34k
C2
4.7uF,6.3V
0603
SW1
Flash
BOURNS-7914J
1 2 R3
1%
19.1k
R1
1K
C6
2.2uF,6.3V
0603
C4
0.1uF,6.3V
U2
PIC16F630I/ST
9
10
11
13
12
1
2
3
4
5
14
6
7 8
RC1
RC0
RA2
RA0
RA1
VDD
RA5
RA4
MCLR#
RC5
VSS
RC4
RC3 RC2 R6
10k
U1
LTC3216EDE
8
2
5
6
4
9
7
3
12
1
10
11
13
EN2
C1+
ILED
ISET2
ISET1
VIN
EN1
CPO
C1-
C2+
C2-
GND
GND
R7
10k
C5
0.1uF,6.3V
SW3
ON/OFF
BOURNS-7914J
1 2
SW2
Torch
BOURNS-7914J
1 2
JP1
HD2X3-079
OPT
4
5
12
3
6
4
5
12
3
6
+BT1
2479
C1
2.2uF,6.3V
0603
R2
1K
Linear Technology Corporation
LTC3216EDE
LOW NOISE HIGH CURRENT LED CHARGE PUMP
ENG: KEITH SZOLUSHA (23-30)
BILL OF MATERIALS
DC805A-1
6/20/2005
10:47 AM
Item Qty Reference Part Description Manufacture / Part #
11
BT1 (CUSTOMER PROVIDE) BATTERY HOLDER, 3AAA KEYSTONE, 2479
22
SCREWS (CUSTOMER PROVIDE) M2 X 0.4 SCREW M2 X 0.4 SCREW
32
HEX NUT (CUSTOMER PROVIDE) M2 X 0.4 HEX NUT M2 X 0.4 HEX NUT
44
WASHER (CUSTOMER PROVIDE) 3MM METRIC WASHER H275125019
5 3 C1,C3,C6 CAP., X5R, 2.2uF 6.3V, 10%,0603 AVX, 06036D225KAT1A
6 1 C2 CAP., X5R, 4.7uF 6.3V, 10%,0603 AVX, 06036D475KAT1A
7 2 C4,C5 CAP., X5R, 0.1uF 6.3V, 20%,0402 AVX, 04026D104MAT1A
8 0 JP1 JMP, 2X3PIN, 0.079CC COMM CON, 2202S-06G2
91
LED1 (CUSTOMER PROVIDE) LED EMITTER, LXCL-PWF1 LUMILEDS, LXCL-PWF1
10 1 LED2 LED CHIP, GREEN/RED COLOR,LED-LTST-C155KGJRKT LITE-ON, LTST-C155KGJRKT
11 2 R1,R2 RES., CHIP, 1K 1/16W, 5%, 0402 AAC., CR05-102JM
12 1 R3 RES., CHIP, 19.1K, 1%, 0402 AAC., CR05-1912FM
13 1 R4 RES., CHIP, 6.34K, 1%, 0402 VISHAY, CRCW0402 6.34K 1%
14 3 R5,R6,R7 RES., CHIP, 10K 1/16W, 5%, 0402 AAC., CR05-103JM
15 3 SW1,SW2,SW3 (CUSTOMER PROVIDE) SWITCH, PUSH BUTTON,SW-7914J BOURNS, 7914J-1-000-E
16 1 U1 IC, LTC3216EDE,DFN12DE LINEAR TECH., LTC3216EDE
17 1 U2 IC, PIC16F630I/ST, TSSOP14 MICROCHIP, PIC16F630I/ST
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