SC1485 Datasheet, PDF (2/17 Pages) Semtech Corporation – Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller

SC1485
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
Units
TON1 to AGND1, TON2 to AGND2
-0.3 to +25.0
V
DH1,BST1 to AGND1 and DH2,BST2 to AGND2
-0.3 to +30.0
V
LX1 to AGND1 and LX2 to AGND2
-2.0 to +25.0
V
AGND1 to PGND1, and AGND2 to PGND2
-0.3 to +0.3
V
BST1 to LX1 and BST2 to LX2
-0.3 to +6.0
V
VCCA1, VDDP1 to AGND1 and VCCA2, VDDP2 to AGND2
-0.3 to +6.0
V
FB1, PGOOD1, EN/PSV1, ILIM1, VOUT1, DL1 to PGND1
-0.3 to +6.0
V
FB2, PGOOD2, EN/PSV2, ILIM2, VOUT2, DL2 to PGND2
-0.3 to +6.0
V
Thermal Resistance Junction to Ambient⁽⁵⁾
θ_JA
37
°C/W
Operating Junction Temperature Range
T_J
-40 to +125
°C
Storage Temperature Range
T_STG
-65 to +150
°C
Lead Temperature (Soldering) 10 Sec.
T_LEAD
300
°C
Electrical Characteristics
Test Conditions: V_BAT = 15V, EN/PSV1=EN/PSV2 = 5V, VCCA1 = VDDP1 = VCCA2=VDDP2=5.0V, V_OUT1 = 1.25V, R_TON1 = 1M,V_OUT2 = 1.25V, R_TON2 = 1M
Parameter
Conditions
25°C
-40°C to
125°C
Units
Min Typ Max Min Max
Input Supplies
VCCA1, VCCA2
5.0
4.5
5.5
V
VDDP1, VDDP2
5.0
4.5
5.5
V
VDDP1, VDDP2 Operating Current FB > regulation point, I_LOAD = 0A
1
VCCA1, VCCA2 Operating Current FB > regulation point, I_LOAD = 0A
700
TON1, TON2 Operating Current
R_TON = 1M (300kHz)
15
Shutdown Current
EN/PSV1, EN/PSV2 = 0V
-5
5
µA
1100 µA
µA
-10 µA
VCCA1, VCCA2
5
10 µA
VDDP1, TON1, VDDP2, TON2
0
1
µA
Controller
Error Comparator Threshold
(FBK1, FBK2 turn-on threshold)
Output Voltage Range
VCCA = 4.5V to 5.5V
V_BAT = 2V-25V
0.500
0.495 0.505 V
0.5 VCCA V
 2004 Semtech Corp.
2
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