AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Electrical Characteristics
1
V
IN
= 3.5V; 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.
Symbol
Description
Conditions
Min
2.7
3.0
≤
V
IN
≤
5.5, Active,
No Load Current
EN = 0
V
IN
= 3.5V; Code = 32
1.8
Typ
Max
5.5
3.5
1.0
132
Units
V
mA
µA
mA
µs
kHz
%
Input Power Supply
V
IN
Operation Range
I
cc
I
SHDN
I
D
Charge Pump
T
SS
F
CLK
η
CP
EN/SET
V
EN(L)
V
EN(H)
T
LO
T
HI
T
OFF
Input Current
Operating Current
Shutdown Current
Maximum Output Current
Soft-Start Time
Clock Frequency
Charge Pump Efficiency
V
IN
= 3.6V, I
OUT(Total)
= 120mA;
Measured from IN to OUT
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
108
120
200
1000
93
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Input Leakage
0.5
1.4
0.3
50
-1.0
500
1.0
75
V
V
µs
ns
µs
µA
1. The AAT3122 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.
4
3122.2005.11.1.3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
