MIC2238 Datasheet, PDF (4/16 Pages) Micrel Semiconductor – Dual Synchronous 800mA/800mA Step-Down DC/DC Regulator

Micrel, Inc.
MIC2238
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN)....................................................... +6V
Enable 1 Voltage ………………………………………... +6V
Enable 2 Voltage ……………………………………….. +6V
Logic Input Voltage (V_EN, V_FPWM) ........................... V_IN to 0V
Storage Temperature (T_S) ........................ –65°C to +150°C
ESD ...............................................................................2KV
Operating Ratings⁽²⁾
Supply Voltage (V_IN) .........................................2.5V to 5.5V
Junction Temperature (T_J) ........................ –40°C to +125°C
Package Thermal Resistance (θ_JA).......................... 60°C/W
Electrical Characteristics⁽⁴⁾
TA = 25°C with VIN = VEN1 = VEN2 =3.6V, VOUT1, VOUT2, L= 2.2µH, C = 2.2µF, unless otherwise specified. Bold values indicate –40ºC ≤ TJ
≤ +125ºC.
Parameter
Condition
Min Typ Max Units
Supply Voltage and Current
Supply Voltage Range
2.5
5.5
V
UVLO (rising)
2.3
2.4
2.5
V
UVLO Hysteresis
100
mV
PWM Mode Supply
Current
/FPWM = Low, IOUT = 200mA
560
950
µA
Trickle Mode Supply
Current
/FPWM = High, IOUT = 100µA
28
50
µA
Shutdown Quiescent
Current
VEN = 0V
0.1
1
µA
Output Voltage Accuracy
Feedback voltage, VFB Adjustable
0.780 0.8 0.820
V
Output voltage, VOUT
Feedback bias current
Output Voltage Line
Regulation
Output Voltage Load
Regulation
Fixed Output Options
2.5V ≤ VIN ≤ 5.5V
VIN = 5V, IOUT = 10mA to 800mA, /FPWM = 0V
VIN = 3V; IOUT = 10mA to 800mA, /FPWM = 0V
-2.5
+2.5
%
10
nA
0.1
0.5
%
0.5
%
Ripple in Trickle Mode
Logic Inputs
EN Input Threshold
EN Input Current
/FPWM Input Threshold
/FPWM Input Current
VIN=3.6V; IOUT = 1mA; COUT = 2.2µF, L = 2.2µH.
On
Off
On
Off
40
mV
0.8
1.2
V
0.3
0.7
V
0.01
1
µA
0.6×VIN
V
0.3×VIN
V
0.01
1
µA
July 2007
4
M9999-071307