High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Electrical Characteristics
1
C
IN
= C
OUT
= C
1
= C
2
= 1.0µF; T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are T
A
= 25°C, V
IN
= 3.6V.
Symbol
Description
Conditions
Min
2.7
1X Mode, 3.0
≤
V
IN
≤
5.5, Active,
No Load Current
1.5X Mode, 3.0
≤
V
IN
≤
5.5, Active,
No Load Current
2X Mode, 3.0
≤
V
IN
≤
5.5, Active,
No Load Current
50µA Setting, 1X Mode
V
EN/SET
= 0V
I
SET
= 20mA, T
A
= 25°C
V
F
:D1:D4=3.6V
0.3
1
1
50
18
20
0.5
150
100
1000
0.4
1.4
0.3
50
75
500
500
1
75
1
22
1
µA
µA
mA
%
mV
µs
kHz
V
V
µs
ns
µs
µs
µs
µA
AAT3155
Typ
Max
5.5
1
3
Units
V
Input Power Supply
V
IN
Operation Range
I
CC
Operating Current
mA
Shutdown Current
I
SINK
Average Current Accuracy
I
(D-Match)
Current Matching
2
1X to 1.5X or 1.5X to 2X Transition
V
TH
Threshold at Any I
SINK
Pin
Charge Pump Section
T
SS
Soft-Start Time
F
CLK
Clock Frequency
EN/SET
V
EN(L)
Enable Threshold Low
V
IN
= 2.7V
V
EN(H)
Enable Threshold High
V
IN
= 5.5V
T
EN/SET LO
EN/SET Low Time
T
EN/SET_HI_MIN
Minimum EN/SET High Time
T
EN/SET_HI_MAX
Maximum EN/SET High Time
T
OFF
EN/SET Off Timeout
T
LAT
EN/SET Latch Timeout
I
EN/SET
EN/SET Input Leakage
I
SHDN
I
DX
-1
1. The AAT3155 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
3155.2006.05.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
