AAT3132/32A
High Efficiency 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
3.0
≤
V
IN
≤
5.5
T
A
= 25°C AAT3132-1
T
A
= 25°C AAT3132
VD1:D3 = 3.6, V
IN
= 3.3V
V
IN
= 3.5V, I
OUT(TOTAL)
= 90mA,
Measured from IN to OUT
1.8
Typ
Max
5.5
3.5
1.0
22
27.5
33
Units
V
mA
µA
mA
mA
%
%
Input Power Supply
V
IN
Operation Range
I
CC
I
SHDN
I
DX
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
Operating Current
Shutdown Current
Maximum Output Current D1 to D3
Maximum Output Current D4
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
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Input Leakage
18
22.5
27
20
25
30
0.5
93
200
1000
0.5
V
EN/SET
< 0.5
V
EN/SET
> 1.4
V
EN/SET
< 0.5
1.4
0.3
50
-1
500
1
75
µs
kHz
V
V
µs
ns
µs
µA
1. The AAT3132/32A 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
3132.2005.12.1.4