AAT2806
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Electrical Characteristics
1
V
IN
= 3.6V; C
IN
= C
OUT
= C
1
= C
2
= C
3
= 1.0µF; T
A
= -40°C to- 85°C unless otherwise noted.
Typical values are at T
A
= 25°C.
Symbol
V
IN
Description
Operation Range
Conditions
Min Typ Max Units
2.7
5.5
1
3.0
3.7
µA
4.5
1.0
10
0.5
7
4.5
4.5
mA
µA
%
%
Ω
4.68
4.7
V
V
Input Power Supply
I
CC
Operating Current
I
SHDN
I
DX
I
(D-Match)
R
SINK
V
OUT_FL
Shutdown Current
Input Current Accuracy
2, 4
Current Matching Between Any
Two Current Sink Inputs
2, 5
Sink Switch Impedance (each)
2
Flash Charge Pump Output
Voltage
Maximum Continuous I
OUT
Maximum Pulsed I
OUT
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 Latch Timeout
Enable and EN/SET Input
Leakage
1X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = V
IN
1.5X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = V
IN
2X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = V
IN
EN_FLSH = GND, 50µA Output Setting,
1X Mode
3.0
≤
V
IN
≤
5.5, No Load Current;
EN_FLSH = V
IN
, EN/SET = GND
EN_FLSH = EN/SET = 0
I
SET
= 20mA and I
SET
= 4.1mA; T
A
= 25°C
VD1:D4 = 3.6, V
IN
= 3.5V
0.3
1.0
2.0
50
2.0
mA
-10
I
OUT_FL
T
SS
F
CLK
V
EN(L)
V
EN(H)
T
EN/SET LO
T
EN/SET HI
T
OFF
T
LAT
I
I
3.0V < V
IN
< 5V, I
OUT
= 100mA;
EN_FLSH = V
IN
3.0V < V
IN
< 5V, I
OUT
= 150mA;
EN_FLSH = V
IN
V
IN
= 3.6V; V
OUT
= 4.5V; EN_FLSH = V
IN
V
IN
= 3.6V; V
OUT
= 4.5V; I
PULSED
< 500mS
4.32
4.3
120
250
mA
100
1.0
0.4
µs
MHz
V
V
µs
ns
µs
µs
µA
1.4
0.3
50
75
500
500
1.0
-1.0
1. The AAT2806 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. Specification applies only to the tri-mode charge pump.
3. Specification applies only to the charge pump doubler.
4. Determined by the sum of all active channels
5. Current matching is defined as the deviation of any sink current at I
OUT
= 20mA and 2mA.
4
2806.2005.07.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
