AAT3123/23A/24
High Efficiency 1X/1.5X Fractional 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
3.0
≤
V
IN
≤
5.5, Active,
No Load Current
EN = 0
V
IN
=
3.5V, Code = 32, T
A
= 25°C
VD1:D4 = 3.6V, V
IN
= 3.5V
VD5:VD6 = 3.6V, V
IN
= 3.5V
V
IN
= 3.5V, I
OUT(TOTAL)
= 120mA,
Measured from IN to OUT
1.8
Typ
Max
5.5
3.5
1
22
Units
V
mA
µA
mA
%
%
Input Power Supply
V
IN
Operation Range
I
cc
Operating Current
I
SHDN(MAX)
I
DX
I
(D-Match)
η
CP
Charge Pump
T
SS
F
CLK
EN/SET
V
EN(L)
V
EN(H)
T
EN/SET LO
T
EN/SET HI
T
OFF
Input Current
Shutdown Current
Output Current
Current Matching Between Any
Two Outputs
Charge Pump Section Efficiency
Section
Soft-Start Time
Clock Frequency
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minumum EN/SET High Time
EN/SET Off Timeout
EN/SET Input Leakage
18
20
0.5
0.5
93
200
1000
V
IN
= 2.7V to 5.5V
V
IN
= 2.7V to 5.5V
0.5
1.4
0.3
50
-1
500
1
75
µs
kHz
V
V
µs
ns
µs
µA
1. The AAT3123/4 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
3123.2005.12.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
