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Linear Technology Electronic Components Datasheet

LTC3202EMS Datasheet

Low Noise High Efficiency Charge Pump

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LTC3202
Low Noise, High Efficiency
Charge Pump for White LEDs
FEATURES
s Low Noise Constant Frequency Operation
s 25% Less Input Current Than Doubler Charge Pump
s High Output Current: Up To 125mA
s Small Application Circuit
s Regulated Output Voltage or Current
s Automatic Soft-Start
s VIN Range: 2.7V to 4.5V
s No Inductors
s 1.5MHz Switching Frequency
s ICC < 1µA in Shutdown
s Available in 10-Pin MSOP and 3mm × 3mm
DFN Packages U
APPLICATIO S
s White LED Backlighting
s Programmable Boost Current Source
DESCRIPTIO
The LTC®3202 is a low noise, constant frequency charge
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
VIN and VOUT) make the LTC3202 ideally suited for small,
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 VOUT to GND. Built-in soft-start circuitry
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 VIN and reduces quiescent current to less
than1µA.
The LTC3202 is available in the 10-pin MSOP and 3mm ×
3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Programmable White LED Power Supply
C2
C3
1µF
1µF
8 79 6
C1+
10 D0
CURRENT
C1
C2+
C2
0mA TO 125mA
3 TOTAL CURRENT
VOUT
PROGRAMMING 1 D1 LTC3202
VIN
3V TO 4.5V
C1
1µF
4 VIN
2
FB
GND
5, 11
C4
1µF
36
36
36
36
3636
C1, C2, C3, C4 = MURATA GRM 39X5R105K6.3 OR TAIYO YUDEN JMK107BJ105MA
3202 TA01
Input and Output Ripple
VIN
(AC COUPLED)
20mV/DIV
VOUT
(AC COUPLED)
20mV/DIV
VIN = 3.6V
500ns/DIV
CIN = COUT = 1µF
IOUT = 60mA
3202 G09
3202fa
1


Linear Technology Electronic Components Datasheet

LTC3202EMS Datasheet

Low Noise High Efficiency Charge Pump

No Preview Available !

LTC3202
ABSOLUTE AXI U RATI GS (Note 1)
VIN, VOUT to GND ......................................... –0.3V to 6V
D0, D1 ............................................. –0.3V to VIN + 0.3V
VOUT Short-Circuit Duration ............................. Indefinite
IOUT (Note 2)....................................................... 150mA
Operating Temperature Range (Note 3) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
D1 1
FB 2
VOUT 3
VIN 4
GND 5
TOP VIEW
10 D0
9 C2+
8 C1+
7 C1
6 C2
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W
ORDER PART
NUMBER
LTC3202EMS
MS PART MARKING
LTWL
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
D1 1
10 D0
FB 2
9 C2+
VOUT 3
11
8 C1+
VIN 4
7 C1
SGND 5
6 C2
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 44°C/W, θJC = 3°C/W
EXPOSED PAD IS PGND (PIN 11) MUST BE
CONNECTED TO GROUND PLANE
ORDER PART
NUMBER
LTC3202EDD
DD PART MARKING
LABB
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Power Supply
VIN Operating Voltage
ICC Operating Current
ISHDN Shutdown Current
Feedback Pin Set Points
q 2.7
4.5
V
IOUT = 0mA, VOUT = 3.6V, VIN = D0 = D1 = 4.5V q
VOUT = 0V
q
2.5
5
mA
1
µA
0.2V Setting Feedback Voltage
0.4V Setting Feedback Voltage
0.6V Setting Feedback Voltage
IFB
Charge Pump
D0 = 1, D1 = 0, IOUT = 0mA, VIN = 3.6V
D0 = 0, D1 = 1, IOUT = 0mA, VIN = 3.6V
D0 = 1, D1 = 1, IOUT = 0mA, VIN = 3.6V
VFB = 0.8V
q 188 200 212
mV
q 380 400 420
mV
q 570 600 630
mV
q –50
50
nA
ROL Open Loop Output Impedance (1.5VIN – VOUT)/IOUT VIN = 3.3V, VOUT = 4.4V, VFB = 0
q
VOUT Load Regulation (VOUT/IOUT)
IOUT = 10mA to 90mA, VFB/VOUT = 1
CLK Frequency
4.5
6
0.35
mV/mA
1.5
MHz
D0, D1
High Level Input Voltage (VIH)
Low Level Input Voltage (VIL)
Input Current (IIH)
Input Current (IIL)
DO, D1 = VIN
DO, D1 = 0V
q 1.3
q
q –1
q –1
V
0.4
V
1
µA
1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Based on long-term current density limitations.
Note 3: The LTC3202E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
3202fa
2


Part Number LTC3202EMS
Description Low Noise High Efficiency Charge Pump
Maker Linear
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