SIC403A Datasheet, PDF (6/24 Pages) Vishay Siliconix – 6 A microBUCK® SiC403A/B Integrated Buck Regulator with Programmable LDO

SiC403A, SiC403BCD
Vishay Siliconix
ELECTRICAL SPECIFICATIONS
Parameter
I_LIM Comparator Offset Voltage
Output Under-Voltage Fault
Smart Power-Save Protection
Threshold Voltage ^(b)
Over-Voltage Protection Threshold
Over-Voltage Fault Delay ^(b)
Over Temperature Shutdown ^(b)
Logic Inputs/Outputs
Logic Input High Voltage
Logic Input Low Volatge
EN/PSV Input for P-Save Operation ^(b)
EN/PSV Input for Forced Continuous
Operation ^(b)
Symbol
V_ILM-LK
V_{OUV_Fault}
P_{Save_VTH}
t_OV-Delay
T_Shut
V_IH
V_IL
Test Conditions Unless Specified
V_IN = 12 V, V_DD = 5 V, T_A = + 25 °C for typ.,
- 40 °C to + 85 °C for min. and max.,
T_J = < 125 °C, typical application circuit
With respect to A_GND
V_FB with respect to Internal 600 mV
reference, 8 consecutive clocks
V_FB with respect to internal 600 mV
V_FB with respect to internal 600 mV
10 °C hysteresis
Min. Typ. Max. Unit
- 10 0 + 10 mV
- 25
+ 10
%
+ 20
5
µs
150
°C
V_DD = 5 V
1
0.4
2.2
5
V
1
2
EN/PSV Input for Disabling Switcher
0
0.4
EN/PSV Input Bias Current
I_EN
EN/PSV = V_DD or GND
- 10
+ 10
ENL Input Bias Current
I_ENL
ENL = V_IN = 28 V
11 18 µA
FBL, FB Input Bias Current
FBL_I_LK
FBL, FB = V_DD or GND
-1
+1
Linear Dropout Regulator
FBL ^(b)
V_{LDO ACC}
0.75
V
Short-circuit protection,
V_IN = 12 V, V_DD < 0.75 V
65
LDO Current Limit
LDO_I_LIM
Start-up and foldback, V_IN = 12 V,
0.75 < V_DD < 90 % of final V_DD value
115
mA
V_LDO to V_OUT Switch-over Threshold ^(d)
V_LDO to V_OUT Non-switch-over Threshold ^(d)
V_LDO-BPS
V_LDO-NBPS
Operating current limit, V_IN = 12 V,
V_DD > 90 % of final V_DD value
135 200
- 130
- 500
+ 130
mV
+ 500
V_LDO to V_OUT Switch-over Resistance
R_LDO
V_OUT = 5 V
2

LDO Drop Out Voltage ^(e)
From V_IN to V_DD,
V_DD = + 5 V, I_VLDO = 100 mA
1.2
V
Notes:
a. V_{IN UVLO} is programmable using a resistor divider from V_IN to ENL to A_GND. The ENL voltage is compared to an internal reference.
b. Typical value measured on standard evaluation board.
c. SiC403A/B has first order temperature compensation for over current. Results vary based upon the PCB thermal layout
d. The switch-over threshold is the maximum voltage differential between the V_LDO and V_OUT pins which ensures that V_LDO will internally
switch-over to V_OUT. The non-switch-over threshold is the minimum voltage diff erential between the V_LDO and V_OUT pins which ensures that
V_LDO will not switch-over to V_OUT.
e. The LDO drop out voltage is the voltage at which the LDO output drops 2 % below the nominal regulation point.
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Document Number: 62768
6
S12-1972-Rev. A, 27-Aug-12
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000