PRODUCT DATASHEET
AAT3151B
ChargePump
TM
High Efficiency 1X/1.5X 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
= 3.5V.
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
50μA Setting, 1X Mode
EN/SET = 0
I
SET
= 30mA, T
A
= 25°C
V
F
:D1:D4 = 3.6V
I
SET
= 20mA
0.3
1
50
27
30
0.5
150
100
1000
V
IN
= 2.7V
V
IN
= 5.5V
0.4
1.4
0.3
50
75
500
500
1
75
Typ
Max
5.5
1
3
1
33
Units
V
mA
μA
μA
mA
%
mV
μs
kHz
V
V
μs
ns
μs
μs
μs
μA
Input Power Supply
Operation Range
V
IN
I
CC
I
SHDN
I
DX
Operating Current
Shutdown Current
I
SINK
Current Accuracy
2
Current Matching Between Any
I
(D-Match)
Two Current Sink Inputs
3, 4
1X to 1.5X Transition Threshold
V
TH
at Any I
SINK
Pin
Charge Pump Section
T
SS
Soft-Start Time
F
CLK
Clock Frequency
EN/SET
V
IL
Enable Threshold Low
V
IH
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
5
T
LAT
EN/SET Latch Timeout
6
I
EN/SET
EN/SET Input Leakage
-1
1. The AAT3151B is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and cor-
relation with statistical process controls.
2. Determined by the average of all active channels.
3. Current matching is defined as the deviation of any sink current at I
OUT
= 20mA and 2mA.
4. Specification applies only to the tri-mode charge pump.
5. The EN/SET pin must remain logic low (less than V
IL
) for the duration of longer than 500μs to guarantee the off timeout.
6. The EN/SET pin must remain logic high (greater than V
IH
) for the duration of longer than 500μs to guarantee the latch timeout.
4
www.analogictech.com
3151B.2008.02.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
