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PDF AAT2505 Data sheet ( Hoja de datos )
| Número de pieza | AAT2505 | |
| Descripción | Step-Down Converter/Linear Regulator | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT2505
Dual Channel, Step-Down
Converter/Linear Regulator
General Description
Features
SystemPower™
The AAT2505 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is a low dropout (LDO) linear regulator and a
step-down converter with an input voltage range of
2.7V to 5.5V, making it ideal for applications with
single cell lithium-ion / polymer batteries.
The LDO has an independent input pin and is capa-
ble of delivering up to 300mA of current. The linear
regulator has been designed for high-speed turn-on
and turn-off performance, fast transient response,
and good power supply rejection ratio (PSRR).
Other features include low quiescent current, low
dropout voltage, and a Power-OK (POK) open drain
output signaling when VOUT is in regulation.
The 600mA step-down converter is designed to
operate with 1.4MHz of switching frequency, mini-
mizing external component size and cost while
maintaining a low 27µA no load quiescent current.
• VIN Range: 2.7V to 5.5V
• 300mA LDO
— 400mV Dropout Voltage at 300mA
— High Accuracy: ±1.5%
— Fast Line / Load Transient Response
— Power OK Output
• 600mA Step-Down Converter
— Up To 98% Efficiency
— 27µA No Load Quiescent Current
— Shutdown Current <1µA
— Low RDS(ON) Integrated Power Switches
— Fast Turn-On Time (150µs Typical)
— Low Dropout 100% Duty Cycle
— 1.4MHz Switching Frequency
— Internal Soft Start
• Over-Temperature and Current Limit
Protection
• TDFN33-12 Package
• -40°C to +85°C Temperature Range
Peak current mode control with internal compen-
sation provides a stable converter with a low equiv-
alent series resistance (ESR) ceramic
capacitor for extremely low output ripple.
Applicationsoutputwww.DataSheet4U.com
For maximum battery life with high voltage outputs,
the step-down converter duty cycle increases to
100%. The output voltage is either fixed or adjustable
with an integrated P- and N-channel MOSFET power
stage and 1.4MHz switching frequency.
The AAT2505 is available in a Pb-free, 12-pin
TDFN33 package and is rated over a temperature
range of -40°C to +85°C.
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor/DSP Core/IO Power
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
VIN = 2.7V to 5.5V
C3
10µF
3 VP
VCC 4
3.3V at 300mA
5 VLDO
9 ENLDO
EN 10
LX 2
6
R3 100kΩ 7
OUT
POK
FB 11
SGND 12
C4
2.2 µF
8 GND
PGND 1
U1
AAT2505
2.5V at 600mA
L1
6.8µH
C1
4.7µF
L1 Sumida CDRH3D16-4R7 C1 Murata GRM219R61A475KE19
C3 Murata GRM21BR60J106KE19
2505.2006.06.1.1
100
90
80
70
60
0.1
Efficiency
(VOUT = 2.5V; L = 6.8µH)
VIN = 3.3V
1 10 100
Output Current (mA)
1000
1
1 page  
AAT2505
Dual Channel, Step-Down
Converter/Linear Regulator
Electrical Characteristics1
IOUT = 600mA; typical values are TA = 25°C, VIN = VCC = VP = 3.6V.
Symbol Description
Buck Converter
VIN Input Voltage
VUVLO
UVLO Threshold
VOUT
VOUT
IQBUCK
Output Voltage Tolerance
Output Voltage Range
Step-Down Converter
Quiescent Current
ISHDN
Shutdown Current
ILIM
RDS(ON)H
RDS(ON)L
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
ILXLK
LX Leakage Current
ΔVLinereg
Line Regulation
VFB FB Threshold Voltage Accuracy
IFB FB Leakage Current
RFB FB Impedance
TS Start-Up Time
FOSC
TSD
Oscillator Frequency
Over-Temperature Shutdown
Threshold
THYS
Over-Temperature Shutdown
Hysteresis
Logic Signals
VEN(L)
VEN(H)
IEN(H)
Enable Threshold Low
Enable Threshold High
Leakage Current
Conditions
VIN Rising
Hysteresis
VIN Falling
IOUT = 0 to 600mA,
VIN = 2.7V to 5.5V
ENLDO = GND, No Load,
0.6V Adjustable Version
EN = SGND = PGND,
ENLDO = GND
VIN = 5.5V, VLX = 0 to VIN,
EN = SGND = PGND
VIN = 2.7V to 5.5V
0.6V Output, No Load,
TA = 25°C
0.6V Output
> 0.6V Output
From Enable to Output
Regulation
TA = 25°C
Min Typ Max Units
2.7 5.5 V
2.7 V
100 mV
1.8 V
-3.0 3.0 %
0.6 VIN V
27 70 µA
1.0 µA
800
0.45
0.40
mA
Ω
Ω
1.0 µA
0.1 %/V
591 600 609 mV
0.2 µA
250 kΩ
150 µs
1.0 1.4 2.0 MHz
140 °C
15 °C
0.6 V
1.4 V
-1.0 1.0 µA
1. The AAT2505 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.
2505.2006.06.1.1
5
5 Page 
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Step-Down Converter Soft Start
(VIN = 3.6V; VOUT = 1.8V; 400mA;
EN = VIN; ENLDO = GND)
5.0
4.0 VEN
VO
1.6
1.4
3.0 1.2
2.0 1.0
1.0 0.8
0.0 0.6
-1.0 0.4
-2.0
-3.0 IL
0.2
0.0
-4.0 -0.2
-5.0 -0.4
Time (100μs/div)
AAT2505
Dual Channel, Step-Down
Converter/Linear Regulator
Step-Down Converter Output Ripple
(VIN = 3.6V; VOUT = 1.8V; 400mA;
EN = VIN; ENLDO = GND)
40 0.9
20 0.8
0 0.7
-20 0.6
-40 0.5
-60 0.4
-80 0.3
-100
0.2
-120
0.1
Time (250ns/div)
2505.2006.06.1.1
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet AAT2505.PDF ] | |
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