AAT3142
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
1
Electrical Characteristics
CIN = CCP = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C,
VIN = 3.5V.
Symbol
Description
Conditions
Min Typ Max Units
Input Power Supply
VIN
Operation Range
2.7
5.5
V
µA
mA
µA
%
VD1:D3 = 2.0V, CP = 1X
No Load Current, CP = 1.5X
VIN = 3.5V, EN/SET = 0
VIN = 3.5V, TA = 25°C
550
3
Icc
Operating Current
5
1
10
3
ISHDN
IDX
I(D-Match)
Shutdown Current
Output Current Accuracy
Current Matching
2
-10
-3
3
VD1:D3 = 3.6V, VIN = 3.5V
0.5
93
%
VIN = 3.5V, IOUT(TOTAL) = 90mA,
ηCP
Charge Pump Section Efficiency
%
Measured from IN to CP
Charge Pump Section
TSS
FCLK
Soft-Start Time
Clock Frequency
50
1
µs
MHz
EN/SET
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET HI MIN Minimum EN/SET High Time
TEN/SET HI MAX Maximum EN/SET High Time
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
50
75
500
500
1
TOFF
TLAT
IEN/SET
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
VEN/SET = 5.5V, VIN = 5.5V
-1
1. The AAT3142 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
3142.2007.03.1.2
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
