AAT3151B
High Efficiency 1X/1.5X Charge Pump
For White LED Applications
1
Electrical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted.
Typical values are TA = 25°C, VIN = 3.5V.
Symbol
Description
Conditions
Min Typ Max Units
Input Power Supply
VIN Operation Range
2.7
5.5
1
V
1X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current
1.5X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current
0.3
1
ICC
Operating Current
3
mA
50µA Setting, 1X Mode
EN/SET = 0
ISET = 30mA, TA = 25°C
50
µA
µA
mA
ISHDN
IDX
Shutdown Current
ISINK Current Accuracy
1
33
2
27
30
Current Matching Between Any
Two Current Sink Inputs
1X to 1.5X Transition Threshold at
Any ISINK Pin
I(D-Match)
VTH
VF:D1:D4 = 3.6V
ISET = 20mA
0.5
%
3, 4
150
mV
Charge Pump Section
TSS
FCLK
Soft-Start Time
Clock Frequency
100
1000
µs
kHz
EN/SET
VIL
VIH
TEN/SET LO
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
VIN = 2.7V
VIN = 5.5V
0.4
75
V
V
1.4
0.3
µs
ns
µs
µs
µs
µA
TEN/SET HI MIN Minimum EN/SET High Time
50
_
_
TEN/SET HI MAX Maximum EN/SET High Time
75
500
500
1
_
_
5
TOFF
TLAT
IEN/SET
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
6
-1
1. The AAT3151B 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. Determined by the average of all active channels.
3. Current matching is defined as the deviation of any sink current at IOUT = 20mA and 2mA.
4. Specification applies only to the tri-mode charge pump.
5. The EN/SET pin must remain logic low (less than VIL) for the duration of longer than 500µs to guarantee the off timeout.
6. The EN/SET pin must remain logic high (greater than VIH) for the duration of longer than 500µs to guarantee the latch timeout.
4
3151B.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
