Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Electrical Characteristics
1
C
IN
= C
CP
= C
F
= C1 = C2 = C3 = 1.0µF; T
A
= -40°C to 85°C, unless otherwise noted.
Symbol
Description
Conditions
Min Typ Max Units
2.7
-
5.5
4.5
V
AAT2801
Input Power Supply
V
IN
Operation Range
I
CC
Operating Current
I
SHDN
I
DX
I
(D-Match)
V
OUT
Shutdown Current
Output Current Accuracy
2
Current Matching
3
Flash Charge Pump Output
Voltage
Maximum Continuous I
OUT
I
OUT
Maximum Pulsed I
OUT
η
CP
White LED Charge Pump
Section Efficiency
Charge Pump Section
T
SS
F
CLK
EN/SET
V
EN(L)
V
EN(H)
T
EN/SET LO
T
EN/SET HI MIN
T
EN/SET HI MAX
T
OFF
T
LAT
I
EN/SET/EN_FLSH
Soft-Start Time
Clock Frequency
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
Input Leakage
3.0
≤
V
IN
≤
5.5, No Load Current; V
OUT_FLSH
= 5V, EN/SET = GND, EN_FLSH = V
IN
3.0
≤
V
IN
≤
5.5, EN/SET = V
IN
, EN_FLSH =
GND, VD1:VD4 = 2.0V, CP = 1X
3.0
≤
V
IN
≤
5.5, No Load Current; EN/SET =
-
V
IN
, EN_FLSH = GND, CP = 1.5X
EN_FLSH = EN/SET = 0
-
V
IN
= 3.5, Code = 32, T
A
= 25°C
-10
VD1:D4 = 3.6, V
IN
= 3.5V; LED Charge
-3.0
Pump Only
3.0V < V
IN
< 5V, I
OUT
= 120mA;
4.3
EN_FLSH = V
IN
V
IN
= 3.6V; V
OUT
= 4.5V; EN_FLSH = V
IN
120
V
IN
= 3.6V; V
OUT
= 4.5V; I
Pulsed
< 500mS
250
V
IN
= 3.5V, I
OUT(TOTAL)
= 120mA,
Measured from IN to CP
Backlight Charge Pump
Flash Charge Pump
3.0
0.55
3.0
mA
5.0
1.0
10
3.0
4.7
-
-
µA
%
%
V
mA
%
±0.5
4.5
93
50
200
1.0
-
1.4
0.3
50
-
-
-
-1.0
75
500
500
1.0
0.4
-
75
µs
MHz
V
V
µs
µs
µs
µs
µs
µA
V
EN/SET
< 0.6V
V
EN/SET
> 1.4V
V
EN/SET
> 1.4V
V
EN/SET
< 0.6V
V
EN/SET
> 1.4V
V
EN/SET/EN_FLSH
= 5V, V
IN
= 5V
1. The AAT2801 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. Codes 2 through 7 are guaranteed to be within ±15% of stated current level.
3. Current matching is defined as I
(D-Match)
= (I
D
- I
AVE
)/I
AVE
.
4
2801.2006.04.1.3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
