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AAT3122 데이터시트 PDF




AAT에서 제조한 전자 부품 AAT3122은 전자 산업 및 응용 분야에서
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부품번호 AAT3122 기능
기능 High Efficiency 1X/1.5X Fractional Charge Pump
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AAT3122 데이터시트, 핀배열, 회로
AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
General Description
Features
ChargePump
The AAT3122 is a low noise, constant frequency
charge pump DC/DC converter that uses a dual
• VIN Range: 2.7V to 5.5V
• <1µA of Shutdown Current
mode load switch (1X) and fractional (1.5X) con-
• 1 MHz Switching Frequency
version to increase efficiency in white LED applica-
• Dual Mode 1X and 1.5X Charge Pump for
tions. With input voltages ranging from 2.7V to
Maximum Efficiency
5.5V, the device can produce an output current of
• Only Four External Components
up to 120mA. A low external parts count (two 1µF
• Simple Serial Control (S2Cwire) Interface
flying capacitors and two small bypass capacitors
• Low Noise Constant Frequency Operation
at VIN and OUT) makes the AAT3122 ideally suited
for small battery-powered applications.
• 33% Less Input Current Than Doubler Charge
Pumps
AnalogicTech's Simple Serial Control™ (S2Cwire™)
interface is used to enable, disable, and set the
LED drive current with a 32-level logarithmic scale
LED brightness control. The AAT3122 has a ther-
mal management system to protect the device in
the event of a short-circuit condition on any of the
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• No Inductors
• TSOPJW-12 Package
• -40°C to +85°C Temperature Range
output pins. Built-in soft-start circuitry prevents
excessive inrush current during start-up. High
switching frequency enables the use of small exter-
nal capacitors. A low shutdown current feature dis-
Applications
connects the load from VIN and reduces quiescent
current to less than 1µA. The AAT3122 provides awww.DataSheet4U.com
single current source output that can be used to
Programmable Current Source
White LED Backlighting
drive up to six LEDs at 20mA each. The AAT3122
is available in a Pb-free TSOPJW-12 package.
Typical Application
VBATTERY
CIN COUT
1µF 1µF
EN/SET
VIN C1+
AAT3122
VOUT
C1-
C2+
C2-
EN/SET
D
GND
C1
1µF
C2
1µF
D1 D2 D3 D4 D5 D6
3122.2005.11.1.3
1




AAT3122 pdf, 반도체, 판매, 대치품
AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Electrical Characteristics1
VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C. Unless otherwise noted, typical values are
TA = 25°C.
Symbol
Description
Input Power Supply
VIN Operation Range
Icc Operating Current
ISHDN
ID
Charge Pump
TSS
FCLK
Shutdown Current
Maximum Output Current
Soft-Start Time
Clock Frequency
ηCP Charge Pump Efficiency
EN/SET
VEN(L)
VEN(H)
TLO
THI
TOFF
Input Current
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Input Leakage
Conditions
Min Typ Max Units
3.0 VIN 5.5, Active,
No Load Current
EN = 0
VIN = 3.5V; Code = 32
VIN = 3.6V, IOUT(Total) = 120mA;
Measured from IN to OUT
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
2.7 5.5
1.8 3.5
1.0
108 120 132
200
1000
93
0.5
1.4
0.3 75
50
500
-1.0 1.0
V
mA
µA
mA
µs
kHz
%
V
V
µs
ns
µs
µA
1. The AAT3122 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.
4 3122.2005.11.1.3

4페이지










AAT3122 전자부품, 판매, 대치품
AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Functional Block Diagram
VIN
Soft Start
1MHz
Oscillator
Voltage
Reference
1.5X
Charge
Pump
C1+
C1-
C2+
C2-
OUT
EN/SET
S2Cwire
Interface
5 32x8 bit 8
ROM
Current
Mode
DAC
D
GND
Functional Description
The AAT3122 is a dual mode load switch (1X) and
high efficiency (1.5X) fractional charge pump device
intended for white LED backlight applications. The
fractional charge pump consists of a low dropout lin-
ear voltage regulator followed by a 1.5X charge
pump. To maximize power conversion efficiency, an
internal feedback control sensing circuit monitors
the voltage required on the constant current source
output. This control circuit then sets the load switch
and charge pump functions based upon the input
voltage level versus the output voltage level needed.
This function significantly enhances overall device
efficiency when the input voltage level is greater
than the voltage required at the constant current
source output. Switchover between the 1.5X
(charge pump) operating mode and the 1X (load
switch) mode occurs automatically (as a function of
input and output voltages) and does not require user
intervention to maintain maximum efficiency.
The AAT3122 requires only four external compo-
nents: two 1µF ceramic capacitors for the charge
pump flying capacitors (C1 and C2), one 1µF
ceramic capacitor for CIN, and one 0.33µF to 1µF
ceramic capacitor for COUT. The LDO/1.5X charge
pump output is converted into a constant current
output capable of driving up to six individual LEDs
with a maximum of 20mA each. The current source
output magnitude is controlled by the EN/SET seri-
al data S2Cwire interface. The interface records ris-
ing edges of the EN/SET pin and decodes them into
32 individual current level settings each 1dB apart.
This is summarized in Figure 1 and Table 1. Code
32 is full scale, and Code 1 is full scale attenuated
by 31dB. The modulo 32 interface wraps states
back to State 1 after the 32nd clock.
3122.2005.11.1.3
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