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LTC3201EMS#TRPBF

P1-P3P4-P6P7-P8
LTC3201
1
3201f
APPLICATIO S
U
TYPICAL APPLICATIO
U
FEATURES
DESCRIPTIO
U
The LTC
®
3201 is an ultralow noise, constant frequency,
charge pump DC/DC converter specifically designed for
powering white LEDs. The part produces a low noise
boosted supply capable of supplying 100mA of output
current. LED current is regulated for accurate and stable
backlighting. A 3-bit DAC provides output current adjust
for brightness control.
Low external parts count (one small flying capacitor and
three small bypass capacitors) and small MSOP-10 pack-
age size make the LTC3201 ideally suited for space con-
strained applications. An input noise filter further reduces
input noise, thus enabling direct connection to the battery.
High switching frequency enables the use of small external
capacitors.
The LTC3201 contains overtemperature protection and
can survive an indefinite output short to GND. Internal
soft-start circuitry also prevents excessive inrush current
on start-up. A low current shutdown feature disconnects
the load from V
IN
and reduces quiescent current to less
than 1µA.
■
White LED Backlighting
■
Programmable Boost Current Source
■
Input Noise Filter Minimizes Supply Noise
■
Constant Frequency Operation
■
3-Bit LED Current Control
■
No Inductors
■
Low Shutdown Current: I
IN
< 1µA
■
Output Current: 100mA
■
V
IN
Range: 2.7V to 4.5V
■
1.8MHz Switching Frequency
■
Soft-Start Limits Inrush Current at Turn-On
■
Short-Circuit and Overtemperature Protected
■
Available in 10-Pin MSOP Package
100mA Ultralow Noise
Charge Pump LED Supply
with Output Current Adjust
Ultralow Noise White LED Driver
with Adjustable Current Control
Input Current Ripple
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC3201
V
IN
CM CP
V
OUT
D0-D2
FILTER
GND
FB
1µF
1µF
0.22µF
0.22µF
56Ω 56Ω 56Ω
UP TO
6-WHITE LEDs
Li ION
LED
CURRENT
ADJUST
3
3201 TA01a
+
• • •
3201 TA01b
50mA/DIV
I
OUT
= 100mA
I
IN
= 205mA
V
IN
= 3.6V
100ns/DIV
LTC3201
2
3201f
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, C
FILTER
= C
FLY
= 0.22µF, C
IN
= C
OUT
= 1µF,
t
MIN
to t
MAX
unless otherwise noted.
V
IN
, V
FILTER
, V
OUT
, CP, CM to GND ..............–0.3V to 6V
D0, D1, D2, FB to GND ................. –0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration............................. Indefinite
I
OUT
......................................................................................
150mA
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
MS PART
MARKING
T
JMAX
= 150°C
θ
JA
= 130°C/W (1 LAYER BOARD)
θ
JA
= 100°C/W (4 LAYER BOARD)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3201EMS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage ● 2.7 4.5 V
V
IN
Operating Current I
OUT
= 0mA ● 4 6.5 mA
V
IN
Shutdown Current D0, D1, D2 = 0V, V
OUT
= 0V ● 1 µA
Open-Loop Output Impedance I
OUT
= 100mA 8 Ω
Input Current Ripple I
IN
= 200mA 30 mA
P-P
Output Ripple I
OUT
= 100mA, C
OUT
= 1µF30mV
P-P
V
FB
Regulation Voltage D0 = D1 = D2 = V
IN
● 0.57 0.63 0.66 V
V
FB
DAC Step Size 90 mV
Switching Frequency Oscillator Free Running 1.4 1.8 MHz
D0 to D2 Input Threshold ● 0.4 1.1 V
D0 to D2 Input Current ● –1 1 µA
V
OUT
Short-Circuit Current V
OUT
= 0V 150 mA
V
OUT
Turn-On Time I
OUT
= 0mA 1 ms
LTVB
1
2
3
4
5
V
OUT
CP
FILTER
CM
GND
10
9
8
7
6
FB
V
IN
D2
D1
D0
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3201E 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.
LTC3201
3
3201f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SUPPLY VOLTAGE (V)
2.7
0.640
0.635
0.630
0.625
0.620
0.615
0.610
0.605
3.6 4.2
3201 G01
3.0 3.3
3.9 4.5
FEEDBACK VOLTAGE (V)
C
FLY
= C
FILTER
= O.22µF
C
IN
= C
OUT
= 1µF
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
LOAD CURRENT (mA)
0
4.15
4.10
4.05
4.00
3.95
3.90
3.85
3.80
3201 G02
20 40 60 80 100 120 140 160 180 200
OUTPUT VOLTAGE (V)
C
FLY
= C
FILTER
= O.22µF
C
IN
= C
OUT
= 1µF
T
A
= 25°C
V
IN
= 4.5V
V
IN
= 3.2V
V
IN
= 2.7V
SUPPLY VOLTAGE (V)
2.7
OSCILLATOR FREQUENCY (MHz)
2.2
2.0
1.8
1.6
1.4
1.2
3.3
3.9
4.2
3201 G03
3.0
3.6
4.5
C
FLY
= C
FILTER
= O.22µF
C
IN
= C
OUT
= 1µF
V
OUT
= 4V
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
SUPPLY VOLTAGE (V)
2.7
SHORT-CIRCUIT CURRENT (mA)
250
200
150
100
50
0
3.3
3.9
4.2
3201 G04
3.0
3.6
4.5
C
FLY
= C
FILTER
= O.22µF
C
IN
= C
OUT
= 1µF
T
A
= 25°C
FEEDBACK VOLTAGE (V)
0.620
0.615
0.610
0.605
0.600
0.595
0.590
C
FLY
= C
FILTER
= O.22µF
C
IN
= C
OUT
= 1µF
T
A
= 25°C
SUPPLY VOLTAGE (V)
2.7 3.3
3.9
4.2
3201 G05
3.0
3.6
4.5
Feedback Voltage vs Supply
Voltage
Oscillator Frequency vs Supply
Voltage
Feedback Voltage
vs Supply Voltage
I
OUT
= 100mA, V
OUT
= 4V
Output Voltage vs Load Current
Short-Circuit Current vs Supply
Voltage Feedback Voltage vs I
OUT
I
OUT
(mA)
0
V
FB
(V)
0.64
0.62
0.60
0.58
0.56
0.54
0.52
0.50
20
3201 G06
40 60 80 100 120 140 160180 200 220
C
FLY
= C
FILTER
= 0.22µF
C
IN
= C
OUT
= 1µF
T
A
= 25°C
V
IN
= 3.6V
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LTC3201EMS#TRPBF

Mfr. #:
Buy LTC3201EMS#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 100mA Ultralow N Ch Pump LED S w/ Out C
Lifecycle:
New from this manufacturer.
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