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부품번호 | AAT2749 기능 |
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기능 | 3.0MHz Step-Down Converter and Low-V LDO | ||
제조업체 | Skyworks | ||
로고 | |||
전체 17 페이지수
DATA SHEET
AAT2749
3.0MHz Step-Down Converter and Low-VIN LDO
General Description
The AAT2749 is a two channel power regulator that oper-
ates from 2.3V to 5.5V. The AAT2749 contains a 3.0MHz,
600mA step-down converter and a low input voltage
300mA LDO regulator.
The step-down converter can deliver 600mA of load cur-
rent. The 3.0MHz switching frequency minimizes the size
of external components while keeping switching losses
low. The AAT2749 step-down converter maintains high
efficiency throughout the operating range, which is criti-
cal for portable applications. Fixed frequency, low noise
operation can be forced by a logic signal on the MODE
pin.
The AAT2749 also contains a 300mA LDO regulator with
input voltage capability as low as 1.62V. The LDO regula-
tor power input can be tied directly to the output of the
step-down regulator to increase efficiency.
Total quiescent current for the step-down converter and
LDO is a low 100μA under no load condition.
The AAT2749 is available in a Pb-free, space-saving
9-pin chip scale package (CSP) (200μm bump in 400μm
pitch) and is rated over the -40°C to +85°C temperature
range.
Features
• VIN Range: 2.3V to 5.5V
• Two Outputs
▪ VOUT_BUCK = 1.8V
▪ VOUT_LDO = 1.0V, 1.2V
• Step-Down Converter
▪ Ultra-Small 0603 Inductor (Height 1mm)
▪ Up to 92% Efficiency
▪ 3.0MHz Switching Frequency
▪ MODE Selection Pin to Select Forced PWM or PWM/
LL Operation Mode
▪ Current Limit Protection
▪ Automatic Soft Start
• LDO Regulator
▪ VINL Range: 1.62V to VIN
▪ 300mA Output Current
▪ Current Limit Protection
• 100μA No Load Quiescent Current
• Over-Temperature Protection
• -40°C to +85°C Temperature Range
Applications
• Battery-Powered Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• PDAs, Palmtops
• Portable Instruments
Typical Application
(2.3V - 5.5V)
(1.62V - 5.5V)
IN_BUCK
CIN_BUCK
4.7μF
LX
OUT_BUCK
IN_LDO OUT_LDO
CIN_LDO
1.0μF
AAT2749
CHIP_ENABLE
MODE
GND
2.2μH
1.8V: 600mA
CBUCK
4.7μF
1.2V: 300mA
CLDO
2.2μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
1
DATA SHEET
AAT2749
3.0MHz Step-Down Converter and Low-VIN LDO
Electrical Characteristics1
VIN = 3.6V; CIN = COUT_BUCK = 4.7μF; CIN_LDO = 1.0μF; COUT_LDO = 2.2μF; TA = -40oC to 85oC unless otherwise noted.
Typical values are at TA = 25oC.
Symbol Description
Step-Down Converter
VIN_BUCK
Input Voltage
VOUT_BUCK_ACC Output Voltage Accuracy
VOUT_BUCK_TOL Output Voltage Tolerance
VOUTB/VIN Line Regulation
ILIM P-Channel Current Limit
RDS(ON)H High Side Switch On Resistance
RDS(ON)L Low Side Switch On Resistance
IOUT_BUCK Out_BUCK Leakage Current
TS Start-Up Time
FOSC
Oscillator Frequency
LDO Regulator
VIN_LDO
Input Voltage
VOUT_LDO_ACC Output Voltage Accuracy
VOUT_LDO_TOL Output Voltage Tolerance
VOUT/VIN Line Regulation
ΔVOUT/IOUT Load Regulation
IOUT(MAX) Maximum Output Current
ILIM Output Current Limit
VDO Dropout Voltage
System Quiescent Curent
IQ
ISHDN
Logic
VCE(L)
VCE(H)
ICE
Thermal
TSD
THYS
System Quiescent Current
Shutdown Current
Enable Threshold Low
Enable Threshold High
Input Low Current
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Conditions
Min Typ Max Units
VIN = 3.6V, 1mA Load, TA = 25°C, PWM
Mode
0mA to 600mA load, VIN = 2.5V to 5.5V
VIN = 2.5V to 5.5V
Vout_BUCK = 1.8V
From Enable to Output Regulation
TA = 25°C
2.3
591 600
-3.0
1000
0.1
360
200
50
3.0
5.5
609
3.0
20
V
mV
%
%/V
mA
mΩ
mΩ
μA
μs
MHz
VIN_BUCK = 3.6V, VIN_LDO = 1.8V, 1mA Load,
TA = 25°C
0mA to 300mA load; VIN_LDO = 2.5V to 5.5V
VINL = 2.5V to 5.5V
0mA to 300mA load
VIN_BUCK = 3.6V, VIN_LDO = 1.8V, 200mA load
1.62
-2
-3
300
0.6
1.2
1
300
VIN_BUCK
+2
+3
V
%
%
%/V
%
mA
A
mV
VOUT_BUCK = 1.8V, No load on LDO, LL Mode
PWM Mode
VCE = GND
100
7
1
μA
mA
μA
VIN = VOUT = 5.5V
1.4
-1.0
0.4 V
V
1.0 μA
140 °C
15 °C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
4 202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
4페이지 Typical Characteristics
Step-Down Converter Output Ripple
(VOUT = 1.8V; VIN = 5V; IOUT = 1mA)
1.84
0.6
1.82
0.5
1.8 0.4
1.78
0.3
1.76
0.2
1.74
0.1
1.72
0
1.7 -0.1
1.68
-0.2
Time (20μs/div)
DATA SHEET
AAT2749
3.0MHz Step-Down Converter and Low-VIN LDO
Step-Down Converter Output Ripple
(VOUT = 1.8V; VIN = 5V; IOUT = 600mA)
1.84
3.5
1.82
3
1.8 2.5
1.78
2
1.76
1.5
1.74
1
1.72
0.5
1.7 0
1.68
-0.5
Time (200ns/div)
Step-Down Converter P-Channel RDS(ON)
vs. Input Voltage
700
600
500
400
300
200
100
0
2.7
3.1
3.5 3.9 4.3 4.7
Input Voltage (V)
T = 120°C
T = 100°C
T = 85°C
T = 25°C
5.1 5.5
Step-Down Converter N-Channel RDS(ON)
vs. Input Voltage
400
350
300
250
200
150
100
50
0
2.7
3.1
T = 120°C
T = 100°C
T = 85°C
T = 25°C
3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Step-Down Converter Soft Start
(VOUT = 1.8V; VIN = 5V; IOUT = 600mA)
6 3.5
43
2 2.5
02
-2 1.5
-4 1
-6 0.5
-8 0
-10 -0.5
Time (50μs/div)
Step-Down Converter Line Transient Response
(VOUT = 1.2V; VIN = 4V to 5V; IOUT = 600mA)
6 2.4
5 2.3
4 2.2
3 2.1
22
1 1.9
0 1.8
-1 1.7
-2 1.6
Time (200μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
7
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부품번호 | 상세설명 및 기능 | 제조사 |
AAT2749 | 3.0MHz Step-Down Converter and Low-V LDO | Skyworks |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |