1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified in not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Derate 20mW/°C above 40°C ambient temperature.
3. Mounted on a FR4 circuit board.
2847.2008.05.1.2
www.analogictech.com
3
PRODUCT DATASHEET
AAT2847
ChargePump
TM
Electrical Characteristics
1
V
IN
= 3.6V; C
IN
= C
LDOA
= C
LDOB
= 2.2µF; C
OUT
= 1µF; C1 = C2 = 1µF; T
A
= 25°C, unless otherwise noted. Typical values
are at T
A
= 25°C.
Symbol
Description
Conditions
Min
2.7
V
EN/SET
= V
ENA
= V
ENB
= 0V
1x Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load,
V
ENA
= V
ENB
= 0V
1.5x Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load,
V
ENA
= V
ENB
= 0V
2x Mode, 3.0
≤
V
IN
≤
5.5, Active, No Load,
V
ENA
= V
ENB
= 0V
DATA 1, 20mA Range
DATA 2, ADDRESS 4
DATA 1, 30mA Range
DATA 1, 15mA Range
V
IN
- V
F
= 1.5V, 20mA Range
20mA Range
Four-Channel Backlight Driver with Dual LDOs
Typ
Max
5.5
1.0
1.0
4.0
5.0
Units
V
µA
Power Supply
Input Voltage Range
V
IN
I
SHDN
Total Shutdown Current at IN
Charge Pump
I
IN
Input Operating Current
mA
I
DX
I
(D-Match)
Average Current Accuracy
18
0.9
Current Matching
2
1x to 1.5x or 1.5x to 2x Transition
V
TH
Threshold at Any DX Pin
f
CLK
Clock Frequency
T
SD
Over-Temperature Shutdown Threshold
T
HYS
Over-Temperature Shutdown Hysteresis
EN/SET Logic Control
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 Timeout
T
LAT
EN/SET Latch Timeout
V
IL(EN/SET)
EN/SET Logic Low Threshold Voltage
V
IH(EN/SET)
EN/SET Logic High Threshold Voltage
I
EN/SET
EN/SET Input Leakage
20
1.0
30
15
0.5
150
1
140
15
22
1.1
mA
%
mV
MHz
°C
°C
1
0.3
50
75
75
500
500
0.4
V
EN/SET
= V
IN
= 5V
1.4
-1
1
µs
ns
µs
µs
µs
V
V
µA
1. The AAT2847 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range is assured by design, characterization and correlation
with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
www.analogictech.com
2847.2008.05.1.2
PRODUCT DATASHEET
AAT2847
ChargePump
TM
Electrical Characteristics
1
V
IN
= 3.6V; C
IN
= C
LDOA
= C
LDOB
= 2.2µF; C
OUT
= 1µF; C1 = C2 = 1µF; T
A
= 25°C, unless otherwise noted. Typical values
are at T
A
= 25°C.
Symbol
I
IN
Four-Channel Backlight Driver with Dual LDOs
Description
IN Operating Current
Conditions
V
ENA
= V
ENB
= V
IN
, V
EN/SET
= 0V, No Load
V
ENA
= V
IN
; V
ENB
= 0V; V
EN/SET
= 0V; No Load
I
LDO[A/B]
= 1mA to 200mA
I
LDO[A/B]
= 150mA
V
IN
= (V
LDO[A/B]
+ 1V) to 5V
I
LDO[A/B]
=10mA, 1kHz
V
ENA
= V
ENB
= V
IN
, V
EN/SET
= 0V, No Load
V
ENA
= V
IN
; V
ENB
= 0V; V
EN/SET
= 0V; No Load
I
LDOA
= 1mA to 150mA
I
LDOB
= 1mA to 150mA
I
LDOA
= 150mA
V
IN
= (LDOA + 1V) to 5V; V
IN
= (LDOB + 1.2V) to 5V
I
LDO[A/B]
=10mA, 1kHz
V
ENA
= V
ENB
= V
IN
, V
EN/SET
= 0V, No Load
V
ENA
= V
IN
; V
ENB
= 0V; V
EN/SET
= 0V; No Load
I
LDOA
= 1mA to 150mA
I
LDOB
= 1mA to 150mA
I
LDOA
= 150mA
V
IN
= (LDO[A/B] + 1V) to 5V
I
LDO[A/B]
= 10mA, 1kHz
Min
Typ
80
60
1.2
150
0.09
50
80
60
2.8
1.5
150
0.09
50
80
60
2.8
1.8
150
0.09
50
Max
150
112
1.23
300
Units
µA
V
mV
%/V
dB
LDOs: AAT2847-EE
Feedback Voltage
V
FBA
, V
FBB
V
DO
Dropout Voltage
∆V
OUT
/
Line Regulation
V
OUT
*∆V
IN
PSRR
Power Supply Rejection Ratio
LDOs: AAT2847-QG
I
IN
LDOA
LDOB
V
DO
∆V
LDO[A/B]
/
V
LDO[A/B]
*∆V
IN
PSRR
IN Operating Current
LDOA Voltage Tolerance
LDOB Voltage Tolerance
LDOA Dropout Voltage
2
LDOA, LDOB Line Regulation
1.17
2.716
1.455
150
112
2.884
1.545
300
µA
V
V
mV
%/V
dB
LDOA, LDOB Power Supply
Rejection Ratio
LDOs: AAT2847-QI
I
IN
LDOA
LDOB
V
DO
∆V
LDO[A/B]
/
V
LDO[A/B]
*∆V
IN
PSRR
IN Operating Current
LDOA Voltage Tolerance
LDOB Voltage Tolerance
LDOA Dropout Voltage
2
LDOA, LDOB Line Regulation
2.716
1.746
150
112
2.884
1.854
300
µA
V
V
mV
%/V
dB
LDOA, LDOB Power Supply
Rejection Ratio
LDO Logic Control – All Options
V
IL(ENA)
,
ENA, ENB Input Logic Low
V
IL(ENB)
Threshold Voltage
V
IH(ENA)
,
ENA, ENB Input Logic High
V
IH(ENB)
Threshold Voltage
ENA, ENB Input Leakage
I
EN[A/B]
0.4
1.4
V
EN[A/B]
= V
IN
= 5V
-1
1
V
V
µA
1. The AAT2847 is guaranteed to meet performance specifications over the –40˚C to +85°C operating temperature range is assured by design, characterization and correlation
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