AAT2138 Datasheet, PDF (4/18 Pages) Skyworks Solutions Inc. – High Current Step-Down Converter with High-Precision Programmable Current Limited Load Switch

DATA SHEET
AAT2138
High Current Step-Down Converter
with High-Precision Programmable Current Limited Load Switch
Electrical Characteristics¹
V_SYSIN = 5.0V, ENREG = SYSIN, ENSYS = AGND = PGND, T_A = -40°C to 85°C unless otherwise noted. Typical values are
at T_A = 25°C.
Symbol
V_SYSIN
V_UVLO(SYSIN)
Description
System Input Voltage Range
System Input Under-Voltage Lockout
V_UVLO(REGIN)
Regulator Input Under-Voltage Lockout
V_DIS(SYSIN)
Regulator Input Discharge Threshold
R_DISCHRG
Discharge MOSFET On-Resistance
T_SHDN
I_Q
Over-Temperature Shutdown Threshold
No Load Supply Current
I_SHDN
Shutdown Current
System Input Load Switch
R_DS(ON)
Load Switch On-Resistance
Δ_ISYSILIM
Current Limit Accuracy
Short-Circuit Current-Limit Threshold
Adjustable Current-Limit Range
t_ILIM
Current-Limit Response Time
t_SS(SYS)
Load Switch Soft-Start Period
V_{IH_ENSYS}
ENSYS Input Logic Threshold High
V_{IL_ENSYS}
ENSYS Input Logic Threshold Low
I_ENSYS
ENSYS Input Current
Step-Down Regulator
V_OUT
I_FB
Output Voltage Range
FB Leakage Current
V_FB
FB Regulation Threshold³
Δ_VOUT/I_OUT
Load Regulation
Δ_VOUT/V_IN
Line Regulation
I_LIMPK
R_DS(ON)HI
R_DS(ON)LO
f_OSC
t_SS(REG)
t_OFF
V_{IH_ENREG}
V_{IL_ENREG}
I_ENREG
High-Side P-Channel MOSFET Current
Limit
High-Side P-Channel MOSFET On-
Resistance
Low-Side N-Channel MOSFET On-
Resistance
Internal Oscillator Frequency
Step-Down Regulator Soft-Start Period⁴
Minimum Off-time
ENREG Input Logic Threshold High
ENREG Input Logic Threshold Low
ENREG Input Current
Conditions
SYSIN, REGIN
SYSIN Rising
Hysteresis
REGIN Rising²
Hysteresis
SYSIN Rising
Hysteresis
V_SYSIN = V_REGIN = 3.6V
Hysteresis = 15°C
No Load Current; Not Switching
ENREG = SW = GND,
V_SYSIN = 5.0V, T_A = 25°C
R_SET = 6.4kΩ, V_REGIN < V_UVLO(REGIN),
T_A = 20°C to 85°C
R_SET = 6.4kΩ, V_REGIN < V_UVLO(REGIN),
T_A = 20°C to 85°C
T_A = 25°C
V_EN = 0V or < V_IN + 0.3V
V_FB = 0.65V
10mA Load, T_A = +25°C
No Load, T_A = -40°C to +85°C
I_OUT = 0 to 2.5A, T_A = 25°C
V_IN = 3.6V to 5.5V, V_OUT = 3.3V,
T_A = 25°C, I_OUT = 10mA
V_REGIN = 3.6V
V_REGIN = 3.6V
C_OUT = 100μF
V_EN = 0V or 5.5V < V_IN + 0.3V
Min Typ
2.7
0.2
0.2
3.15
0.15
8
150
90
Max
5.5
2.7
2.7
1
Units
V
Ω
°C
μA
85
mΩ
-10 ±5 10
%
400
mA
0.5
3
A
5
μs
1.5
ms
1.5
0.4
V
-1.0
1.0
μA
3.0
V_IN
50
588 600 612
582 600 618
0.20
0.10 0.30
V
nA
mV
%/A
%/V
3.0 4.0
A
85
mΩ
50
2.4 2.8
1
50
1.5
0.4
-1.0
1.0
mΩ
MHz
ms
ns
V
V
μA
1. The AAT2138 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
2. Also used for Load Switch Current-Limit Fold-back Threshold
3. The regulated feedback voltage is tested in an internal test mode that connects VFB to the output of the error amplifier.
4. This time period will keep the regulator start-up current around 300mA to 400mA.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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202006C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013