Datasheet

LTC3217
2
3217fa
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
BAT
, CPO to GND ......................................... –0.3V to 6V
EN1, EN2 ......................................–0.3V to (V
BAT
+ 0.3V)
I
CPO
(Note 2) ........................................................600mA
I
ILED1-4
(Note 3) ...................................................150mA
CPO Short-Circuit Duration .............................. Indefi nite
Operating Temperature Range (Note 4)....–40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
16 15 14 13
5 6 7 8
TOP VIEW
17
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1C1P
CPO
EN1
LED1
C2M
EN2
I
SET2
I
SET1
C2P V
BAT
C1M GND1
LED2 LED3 LED4
GND2
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3217EUD#PBF LTC3217EUD#TRPBF LBTQ
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
BAT
Operating Voltage
●
2.9 4.5 V
I
VBAT
Operating Current R
ISET1
= R
ISET2
= 20k, EN1 = EN2 = High
I
CPO
= 0mA, 1x Mode
I
CPO
= 0mA, 1.5x Mode
I
CPO
= 0mA, 2x Mode
1
4
6
mA
mA
mA
V
BAT
Shutdown Current 4μA
LED 1-4 Current
LED Current Ratio (I
LED
/I
SET1/2
)I
LED
= 25mA to 100mA
●
370 400 430 mA/mA
LED Dropout Voltage Mode Switch Threshold, I
LED
= 100mA 330 mV
Mode Switching Delay EN1 Only 2.5 ms
LED Current Matching Any Two Outputs, I
LED
= 100mA 1 %
Charge Pump (CPO)
1x Mode Output Voltage I
CPO
= 0mA V
BAT
V
1.5x Mode Output Voltage I
CPO
= 0mA 4.5 V
2x Mode Output Voltage I
CPO
= 0mA 5.05 V
1x Mode Output Impedance 0.5 Ω
1.5x Mode Output Impedance V
BAT
= 3.4V, V
CPO
≤ 4.6V (Note 5) 2.8 Ω
2x Mode Output Impedance V
BAT
= 3.2V, V
CPO
≤ 5.1V (Note 5) 3.2 Ω
CLOCK Frequency
●
0.6 0.85 1.15 MHz
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BAT
= 3.6V, C1 = C2 = C3 = C4 = 2.2μF, unless otherwise noted.