High Efficiency 1X/1.5X/2X Charge Pump with
PWM Control for White LED Applications
Electrical Characteristics
1
C
IN
= C
CP
= 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
VD1:D4 = 2.0V, CP = 1X
No Load Current, CP = 1.5X
EN/PWM = 0
I
OUT
= 20mA, T
A
= 25°C, V
IN
= 3.5V
VD1:D4 = 3.6V, V
IN
= 3.5V
V
IN
= 3.5V, I
OUT(TOTAL)
= 80mA,
Measured from IN to CP
550
3
18
-3
20
±0.5
93
1000
0.4
1.4
50
2
AAT3143
Typ
Max
5.5
5
1
22
3
Units
V
µA
µA
mA
%
%
kHz
V
V
kHz
µs
Input Power Supply
V
IN
Operation Range
I
CC
I
SHDN
I
DX
I
(D-Match)
η
CP
Charge Pump
F
CLK
EN/PWM
V
EN(L)
V
EN(H)
F
PWM
t
ON(MIN)
Operating Current
Shutdown Current
Output Current Accuracy
Current Matching
2
Charge Pump Efficiency
Section
Clock Frequency
Enable Threshold Low
Enable Threshold High
Maximum PWM Frequency
Minimum Pulse Width
1. The AAT3143 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 I
(D-Match)
= (I
D
- I
AVE
)/I
AVE
.
4
3143.2006.05.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
