LTC3202EDD Linear Technology, LTC3202EDD Datasheet

IC LED DRIVR WHITE BCKLGT 10-DFN

LTC3202EDD

Manufacturer Part Number
LTC3202EDD
Description
IC LED DRIVR WHITE BCKLGT 10-DFN
Manufacturer
Linear Technology
Type
Backlight, White LEDr
Datasheet

Specifications of LTC3202EDD

Topology
PWM, Switched Capacitor (Charge Pump)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
1.5MHz
Voltage - Supply
2.7 V ~ 4.5 V
Mounting Type
Surface Mount
Package / Case
10-DFN
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
125mA
Internal Switch(s)
Yes
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Output
-
Efficiency
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3202EDD
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC3202EDD#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC3202EDD#TR
Manufacturer:
LT
Quantity:
1 200
Part Number:
LTC3202EDD#TRPBF
Manufacturer:
LT
Quantity:
5 123
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
PROGRAMMING
3V TO 4.5V
Low Noise Constant Frequency Operation
25% Less Input Current Than Doubler Charge Pump
High Output Current: Up To 125mA
Small Application Circuit
Regulated Output Voltage or Current
Automatic Soft-Start
V
No Inductors
1.5MHz Switching Frequency
I
Available in 10-Pin MSOP and 3mm 3mm
DFN Packages
White LED Backlighting
Programmable Boost Current Source
CC
CURRENT
IN
1 F
< 1 A in Shutdown
V
Range: 2.7V to 4.5V
C1
IN
10
1
4
D0
D1
V
C1, C2, C3, C4 = MURATA GRM 39X5R105K6.3 OR TAIYO YUDEN JMK107BJ105MA
C1
IN
+
8
1 F
C2
C1
LTC3202
U
7
GND
Programmable White LED Power Supply
5, 11
C2
9
+
1 F
C3
V
C2
OUT
FB
6
3
2
TOTAL CURRENT
0mA TO 125mA
U
C4
1 F
36
36
36
Charge Pump for White LEDs
36
DESCRIPTIO
The LTC
pump DC/DC converter that uses fractional conversion to
increase efficiency in white LED applications. The part can
be used to produce a regulated voltage or current of up to
125mA from a 2.7V to 4.5V input. Low external parts count
(two flying capacitors and two small bypass capacitors at
V
battery-powered applications.
An internal 2-bit DAC allows LED current to be adjusted for
LED brightness control. The LTC3202 also has thermal
shutdown protection and can survive a continuous short-
circuit from V
prevents excessive inrush current during start-up. High
switching frequency enables the use of small external
capacitors. A low current shutdown feature disconnects
the load from V
than1 A.
The LTC3202 is available in the 10-pin MSOP and 3mm
3mm DFN packages.
Low Noise, High Efficiency
IN
, LTC and LT are registered trademarks of Linear Technology Corporation.
36
and V
3202 TA01
®
36
3202 is a low noise, constant frequency charge
OUT
) make the LTC3202 ideally suited for small,
OUT
IN
(AC COUPLED)
(AC COUPLED)
and reduces quiescent current to less
U
to GND. Built-in soft-start circuitry
20mV/DIV
20mV/DIV
V
OUT
V
IN
V
C
I
OUT
IN
IN
= 3.6V
= C
= 60mA
Input and Output Ripple
OUT
= 1 F
500ns/DIV
LTC3202
3202fa
3202 G09
1

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LTC3202EDD Summary of contents

Page 1

... High switching frequency enables the use of small external capacitors. A low current shutdown feature disconnects the load from V than1 A. The LTC3202 is available in the 10-pin MSOP and 3mm 3mm DFN packages. , LTC and LT are registered trademarks of Linear Technology Corporation ...

Page 2

... OUT Note 3: The LTC3202E is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. TOP VIEW ORDER PART NUMBER LTC3202EDD + – – PART MARKING DD PACKAGE LABB = 44 C/ C/W JA ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS V Set Point vs Input Supply FB (200mV Setting) 0. LOAD 0.20 T 0.19 2.7 ...

Page 4

LTC3202 W U TYPICAL PERFOR A CE CHARACTERISTICS V Soft-Start Ramp OUT V D0, D1 2V/DIV V OUT 1V/DIV V = 3.6V 200 s/DIV OUT CTIO S D1, D0 (Pin ...

Page 5

W SI PLIFIED BLOCK DIAGRA OUT 3 W – 2-BIT + DAC SOFT-START AND 1.5MHz SHUTDOWN OSCILLATOR CONTROL 5, 11 GND LTC3202 – ...

Page 6

LTC3202 U OPERATIO (Refer to Simplified Block Diagram) The LTC3202 uses a fractional conversion switched ca- pacitor charge pump to boost much as 1.5 times OUT the input voltage. A two-phase nonoverlapping clock acti- vates the charge ...

Page 7

U OPERATIO (Refer to Simplified Block Diagram) In this configuration the feedback factor ( V be very near unity since the small signal LED impedance will be considerably less than the current setting resistor R . Thus, this configuration will ...

Page 8

LTC3202 U OPERATIO R is dependent on a number of factors including the OL switching term, 1/( internal switch resis- OSC FLY tances and the nonoverlap period of the switching circuit. However, for a given R , the ...

Page 9

U OPERATIO 10nH 0 Figure 5. 10nH Inductor Used for Input Noise Reduction Flying Capacitor Selection Warning: A polarized capacitor such as tantalum or alumi- num should never be used for the ...

Page 10

LTC3202 U OPERATIO Layout Considerations Due to its high switching frequency and the transient currents produced by the LTC3202, careful board layout is necessary. A true ground plane and short connections to all capacitors will improve performance and ensure proper ...

Page 11

... MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U ...

Page 12

... Dual, 250mA/Channel, Spread Spectrum, High Efficiency Step-Down Charge Pump LT3465/LT3465A Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ...

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