AAT3151 Datasheet, PDF (4/14 Pages) Advanced Analogic Technologies – High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

AAT3151
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Electrical Characteristics¹
C_IN = C_OUT = C₁ = C₂ = 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 Typ Max Units
Input Power Supply
V_IN
Operation Range
2.7
5.5
V
1X Mode, 3.0 ≤ V_IN ≤ 5.5, Active,
No Load Current
0.3 1
I_CC
Operating 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
1
3
mA
2.0 3.7
50µA Setting, 1X Mode
50
µA
I_SHDN
I_DX
I_(D-Match)
Shutdown Current
I_SINK Current Accuracy²
Current Matching Between Any
Two Current Sink Inputs^{3, 4}
EN/SET = 0
I_SET = 30mA, T_A = 25°C
V_F:D1:D4 = 3.6V
1
µA
27 30 33 mA
0.5
%
V_TH
1X to 1.5X or 1.5X to 2X Transition I_SET = 20mA
Threshold at Any I_SINK Pin
Charge Pump Section
150
mV
T_SS
F_CLK
EN/SET
Soft-Start Time
Clock Frequency
100
µs
1000
kHz
V_IL
Enable Threshold Low
V_IH
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 Timeout⁵
T_LAT
EN/SET Latch Timeout⁶
I_EN/SET
EN/SET Input Leakage
V_IN = 2.7V
V_IN = 5.5V
0.4
V
1.4
V
0.3
75
µs
50
ns
75 µs
500 µs
500 µs
-1
1
µA
1. The AAT3151 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 I_OUT = 20mA and 2mA.
4. Specification applies only to the tri-mode charge pump.
5. The EN/SET pin must remain logic low (less than V_IL) for the duration of longer than 500µs to guarantee the off timeout.
6. The EN/SET pin must remain logic high (greater than V_IH) for the duration of longer than 500µs to guarantee the latch timeout.
4
3151.2005.12.1.7