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 T
A
= 25°C.
Symbol
V
IN
AAT2806
Description
Operation Range
Conditions
Min Typ Max Units
2.7
5.5
1
3.0
3.7
µA
4.5
1.0
10
mA
µA
%
%
Ω
4.68
4.7
V
V
Input Power Supply
I
CC
I
SHDN
I
DX
I
(D-Match)
R
SINK
V
OUT_FL
I
OUT_FL
T
SS
F
CLK
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
I
1X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
0.3
Current; EN_FLSH = GND, EN/SET = V
IN
1.5X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
1.0
Current; EN_FLSH = GND, EN/SET = V
IN
2X Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load
2.0
Operating Current
Current; EN_FLSH = GND, EN/SET = V
IN
EN_FLSH = GND, 50µA Output Setting,
50
1X Mode
3.0
≤
V
IN
≤
5.5, No Load Current;
2.0
EN_FLSH = V
IN
, EN/SET = GND
Shutdown Current
EN_FLSH = EN/SET = 0
2, 3
Input Current Accuracy
I
SET
= 20mA and I
SET
= 4.1mA; T
A
= 25°C
-10
Current Matching Between Any VD1:D4 = 3.6V, V
IN
= 3.5V
0.5
2, 4
Two Current Sink Inputs
Sink Switch Impedance (each)
2
7
3.0V < V
IN
< 5V, I
OUT
= 100mA;
4.32 4.5
Flash Charge Pump Output
EN_FLSH = V
IN
5
3.0V < V
IN
< 5V, I
OUT
= 150mA;
4.3 4.5
Voltage
EN_FLSH = V
IN
5
Maximum Continuous I
OUT
V
IN
= 3.6V; V
OUT
= 4.5V; EN_FLSH = V
IN
120
5
Maximum Pulsed I
OUT
V
IN
= 3.6V; V
OUT
= 4.5V; I
PULSED
< 500ms
250
Soft-Start Time
100
Clock Frequency
1.0
Enable Threshold Low
Enable Threshold High
1.4
EN/SET Low Time
0.3
Minimum EN/SET High Time
50
Maximum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
Enable and EN/SET Input
-1.0
Leakage
mA
mA
µs
MHz
V
V
µs
ns
µs
µs
µs
µA
0.4
75
75
500
500
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. Determined by the average of all active channels.
4. Current matching is defined as the deviation of any sink current from the average of all active channels.
5. Specification applies only to the charge pump doubler.
4
2806.2006.04.1.8
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
