AAT3152
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
EN/SET = 0
I
SET
= 20mA, T
A
= 25°C
V
F
:D1:D4 = 3.6V
0.3
1
1.5
50
-10
0.5
150
1
10
Typ
Max
5.5
1
3
3
Units
V
Input Power Supply
V
IN
Operation Range
mA
I
CC
Operating Current
Shutdown Current
I
SINK
Average Current Accuracy
I
(D-Match)
Current Matching Between Any
Two Current Sink Inputs
2, 3
V
TH
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any Current Sink Pin
Charge Pump Section
T
SS
Soft-Start Time
F
CLK
Clock Frequency
EN/SET
V
EN(L)
Enable Threshold Low
V
EN(H)
Enable Threshold High
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
µA
µA
%
%
mV
100
1000
0.4
1.4
0.3
50
75
500
500
1
75
µs
kHz
V
V
µs
ns
µs
µs
µs
µA
-1
1. The AAT3152 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 at I
OUT
= 20mA and 2mA.
3. Specification applies only to the tri-mode charge pump.
4
3152.2005.08.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
