AAT3175
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Flash Applications
Electrical Characteristics
1
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,
V
IN
= 3.5V.
Symbol
Description
Conditions
Min
2.7
1X Mode, 3.0
≤
V
IN
≤
5.5,
Active, No Load Current
1.5X Mode, 3.0
≤
V
IN
≤
5.5,
Active, No Load Current
2X Mode, 3.0
≤
V
IN
≤
5.5,
Active, No Load Current
EN/SET = 0
D1, D4 Max Setting
D2, D3 Max Setting
V
F
:D1:D4 = 3.6V, D2 and D3
in Parallel
0.3
1.0
2.0
Typ
Max
5.5
1.0
3.0
3.7
1.0
110
55
5.0
Units
V
Input Power Supply
V
IN
Operation Range
I
CC
Operating Current
mA
I
SHDN
I
DX
I
(D-Match)
V
TH
Shutdown Current
I
SINK
Average Current Accuracy
Current Matching
2
µA
mA
%
mV
90
45
100
50
0.5
250
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any I
SINK
Pin
Charge Pump Section
T
SS
Soft-Start Time
F
CLK
Clock Frequency
EN/SET
V
EN(L)
Enable Threshold Low
V
EN(H)
Enable Threshold High
T
EN/SET LO
EN/SET Low Time
T
EN/SET HI MIN
Minimum EN/SET High Time
T
EN/SET HI MAX
Maximum EN/SET High Time
T
OFF
EN/SET Off Timeout
T
LAT
EN/SET Latch Timeout
I
EN/SET
EN/SET Input Leakage
100
1000
V
IN
= 2.7V
V
IN
= 5.5V
0.4
1.4
0.3
50
75
500
500
1
75
µs
kHz
V
V
µs
ns
µs
µs
µs
µA
-1
1. The AAT3175 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 the deviation of any sink current from the average of all active channels.
4
3175.2006.01.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
