AAT1138 Datasheet, PDF (4/21 Pages) Skyworks Solutions Inc. – 2A Step-Down Converter with Adjustable Input Current Limit

DATA SHEET
AAT1138
2A Step-Down Converter with Adjustable Input Current Limit
Electrical Characteristics¹
V_PVIN = V_SVIN = 3.6V, T_A = -40°C to 85°C unless otherwise noted. Typical values are at T_A = 25°C.
Symbol
V_SYSIN
Description
Input Voltage
T_SD
Over-Temperature Threshold
Step-Down Converter
V_OUT
Output Voltage Range
I_Q
Input DC Supply Current
I_FB
Feedback Input Bias Current
V_{FB_ACC}
Feedback Voltage Accuracy²
V_{FB_TOL}
Feedback Voltage Tolerance
∆V_LINEREG/∆V_IN Line Regulation
∆V_LOADREG/∆I_OUT
I_LIM
R_DS(ON)H
R_DS(ON)L
F_OSC
T_S
V_IL
V_IH
I_LEAK
Load Switch
I_Q
I_Q(OFF)
I_SD(OFF)
V_UVLO
Load Regulation
Current Limit
High Side Switch on Resistance
Low Side Switch on Resistance
Oscillator Frequency
Startup Time
ENBUCK Threshold Low
ENBUCK Threshold High
ENBUCK Leakage Current
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
R_DS(ON)
On Resistance
T_CRDS
I_LIM
I_LIM(MIN)
V_ENSYS\(L)
V_ENSYS\(H)
I_ENSYS\(SINK)
T_RESP
T_OFF
T_ON
On Resistance Temperature Coefficient
Current Limit
Minimum Current Limit
ENSYS Input Low Voltage
ENSYS Input High Voltage
ENSYS Input Leakage
Current Limit Response Time
Turn-Off Time
Turn-On Time
Conditions
V_SYSIN = 5V, T_J Increasing
V_SYSIN = 5V, T_J Decreasing
Min
2.5
Typ
135
105
Max
5.5
Units
V
o_C
Active Mode: V_FB = 0.5V
Shutdown Mode: V_EN = 0V, V_PVIN = 5.5V
V_FB = 0.65V
I_LOAD = 10mA, T_A = 25°C
No load, -40°C ≤ T_A
V_PVIN = 2.5V to 5.5V, 10mA to 2.0A Load
V_PVIN = 2.5V to 5.5V, 10mA Load, T_A =
25°C
I_LOAD= 0A to 2A
V_PVIN = 3.6V
V_PVIN = 3.6V
V_FB = 0.6V
Enable to output regulation
V_EN = 5.5V
0.6
0.588
0.582
-3.0
2.5
0.96
1.5
-1.0
300
0.1
0.60
0.60
0.10
0.2
3.5
135
95
1.2
1.3
V_PVIN
500
1
30
0.612
0.618
+3.0
0.20
200
150
1.44
0.3
1.0
V
μA
μA
nA
V
%
%/V
%/A
A
mΩ
mΩ
MHz
ms
V
V
μA
ENSYS = GND, No Load
ENSYS = 5V
ENSYS = 5V, V_SYSIN = 5V, V_SYSOUT = 0V
Rising Edge, 1% Hysteresis
V_SYSIN = 5.0V, T_A = 25°C
V_SYSIN = 4.5V, T_A = 25°C
V_SYSIN = 3.0V, T_A = 25°C
R_SET = 6.8kΩ
V_SYSIN = 2.7V to 5.5V
V_SYSIN = 2.7V to < 4.2V
V_SYSIN ≥ 4.2V to 5.0V
V_ENSYS = 5.5V
V_SYSIN = 5V
V_SYSIN = 5V, R_L = 10Ω
V_SYSIN = 5V, R_L = 10Ω
0.75
2.0
2.4
9
0.01
1.8
145
150
190
2800
1
130
0.01
0.4
4
24
25
1
1
2.4
180
230
1.25
0.8
1
12
200
μA
μA
μA
V
mΩ
ppm/°C
A
mA
V
V
μA
μs
μs
μs
1. The AAT1138 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. The regulated feedback voltage is tested in an internal test mode that connects VFB to the output of the error amplifier.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
4
201978B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013