AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Electrical Characteristics1
CIN = CCP = CF = C1 = C2 = C3 = 1.0µF; TA = -40°C to 85°C, unless otherwise noted.
Symbol
Description
Conditions
Min Typ Max Units
Input Power Supply
VIN Operation Range
2.7
-
5.5
4.5
V
3.0 ≤ VIN ≤ 5.5, No Load Current; VOUT_FLSH
= 5V, EN/SET = GND, EN_FLSH = VIN
3.0 ≤ VIN ≤ 5.5, EN/SET = VIN, EN_FLSH =
GND, VD1:VD4 = 2.0V, CP = 1X
3.0 ≤ VIN ≤ 5.5, No Load Current; EN/SET =
VIN, EN_FLSH = GND, CP = 1.5X
EN_FLSH = EN/SET = 0
3.0
0.55
3.0
ICC
Operating Current
mA
-
5.0
ISHDN
IDX
Shutdown Current
Output Current Accuracy2
-
1.0
10
µA
%
VIN = 3.5, Code = 32, TA = 25°C
VD1:D4 = 3.6, VIN = 3.5V; LED Charge
Pump Only
-10
-3.0 ±0.5 3.0
%
I(D-Match)
VOUT
Current Matching3
Flash Charge Pump Output 3.0V < VIN < 5V, IOUT = 120mA;
Voltage
4.3
4.5
4.7
V
EN_FLSH = VIN
Maximum Continuous IOUT
Maximum Pulsed IOUT
White LED Charge Pump
Section Efficiency
VIN = 3.6V; VOUT = 4.5V; EN_FLSH = VIN
VIN = 3.6V; VOUT = 4.5V; IPulsed < 500mS
VIN = 3.5V, IOUT(TOTAL) = 120mA,
Measured from IN to CP
120
250
-
-
IOUT
mA
%
ηCP
93
Charge Pump Section
Backlight Charge Pump
Flash Charge Pump
50
200
1.0
TSS
Soft-Start Time
µs
FCLK
EN/SET
VEN(L)
Clock Frequency
MHz
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
-
0.4
-
V
VEN(H)
1.4
0.3
V
TEN/SET LO
VEN/SET < 0.6V
75
µs
µs
µs
µs
µs
µA
TEN/SET HI MIN Minimum EN/SET High Time VEN/SET > 1.4V
TEN/SET HI MAX Maximum EN/SET High Time VEN/SET > 1.4V
50
-
75
500
500
1.0
TOFF
TLAT
EN/SET Off Timeout
VEN/SET < 0.6V
-
-
EN/SET Latch Timeout
VEN/SET > 1.4V
IEN/SET/EN_FLSH Input Leakage
VEN/SET/EN_FLSH = 5V, VIN = 5V
-1.0
1. The AAT2801 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. Codes 2 through 7 are guaranteed to be within ±15% of stated current level.
3. Current matching is defined as I(D-Match) = (ID - IAVE)/IAVE
.
4
2801.2006.04.1.3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
