AAT2805 Datasheet, PDF (4/17 Pages) Advanced Analogic Technologies – Dual High Efficiency Charge Pump for White LED and Flash Applications

AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Electrical Characteristics¹
V_IN = 3.6V; C_IN = C_OUT = C₁ = C₂ = C₃ = 1.0µF; T_A = -40°C to- 85°C unless otherwise noted.
Typical values are at T_A = 25°C.
Symbol Description
Input Power Supply
V_IN
Operation Range
I_CC
Operating Current
I_SHDN
I_DX
I_(D-Match)
R_SINK
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
V_{OUT_FL Voltage}
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
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
Conditions
Min Typ Max Units
2.7
5.5 V
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,
0.3 1
1.0 3.0
mA
1.0 3.0
50
µA
1X Mode
3.0 ≤ V_IN ≤ 5.5, No Load Current;
EN_FLSH = V_IN, EN/SET = GND
EN_FLSH = EN/SET = 0
2.0 4.5 mA
1.0 µA
I_SET = 30mA; T_A = 25°C
VD1:D4 = 3.6, V_IN = 3.5V
-10
10 %
0.5
%
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
V_EN/SET < 0.6V
V_EN/SET > 1.4V
V_EN/SET < 0.6V
V_EN/SET > 1.4V
V_EN/SET = V_{EN_FLSH} = V_IN
7
Ω
4.32 4.5 4.68
V
4.3 4.5 4.7
120
mA
250
100
µs
1.0
MHz
0.4 V
1.4
V
0.3
75 µs
50
ns
500 µs
500 µs
-1.0
1.0 µA
1. The AAT2805 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 from the average of all active channels.
4
2805.2005.05.1.2