FAN5358 Datasheet, PDF (4/13 Pages) Fairchild Semiconductor – 2MHz, 500mA, SC70 Synchronous Buck Regulator

Electrical Characteristics
Minimum and maximum values are at VIN = 2.7V to 5.5V, TA = -40°C to +85°C, circuit of Figure 1 unless otherwise noted.
Typical values are at TA = 25°C, VIN =3.6V.
Symbol
Power Supplies
Parameter
Conditions
Min. Typ. Max. Units
IQ
Quiescent Current
No Load, EN=VIN
25
48
µA
I(SD)
VUVLO
VUVHYST
V(ENH)
V(ENL)
I(EN)
Oscillator
Shutdown Supply Current
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Enable HIGH-Level Input Voltage
Enable LOW-Level Input Voltage
Enable Input Leakage Current
EN = GND
Rising VIN
EN = VIN or GND
0.05
1.00
µA
2.4
2.6
V
225
mV
1.2
V
0.4
V
0.01
1.00
µA
fOSC Switching Frequency
Regulation
In PWM Mode
2
MHz
VO
Output Voltage
Accuracy
tSS
Soft-Start
Output Driver
1.0V
1.2V
1.3V
1.8V
ILOAD = 0 to 500mA
ILOAD = 0 to 500mA
ILOAD = 0 to 500mA
ILOAD = 0 to 500mA
From EN Rising Edge
-4.5
+4.5
-4.5
+4.5
%
-4.5
+4.5
-4.0
+4.0
70
µs
RDS(on)
ILIM
PMOS On Resistance
NMOS On Resistance
PMOS Peak Current Limit
VIN = VGS = 3.6V
VIN = VGS = 3.6V
Open-Loop⁽¹⁾
750
mΩ
650
mΩ
750
850
1150 mA
TTSD Thermal Shutdown
150
°C
THYS Thermal Shutdown Hysteresis
20
°C
Note:
5. The Electrical Characteristics table reflects open-loop data. Refer to Operation Description and Typical Characteristic for
closed-loop data.
Block Diagram
EN
VOUT
GND
Q1
U1
REF
LOGIC
&
RAMP
GEN
GATE
DRIVE _Q2
VIN
C_IN
SW ^L1
GND
VOUT
C_OUT
© 2009 Fairchild Semiconductor Corporation
FAN5358 • Rev. 1.0.1
Figure 3. IC Block Diagram
4
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