33702 Datasheet, PDF (8/24 Pages) Motorola, Inc – 3.0 A Switch-Mode Power Supply with Linear Regulator

Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions -40°C ≤ T_J ≤ 125°C unless otherwise noted. Input voltages V_IN1 = V_IN2 = 3.3 V using the typical
application circuit (see Figure 20) unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
LINEAR REGULATOR (LDO)
LDO Output Voltage Range
V_IN1 = V_IN2 = 2.8 V to 6.0 V, I_LDO = 10 mA to 1000 mA
V_LDO
V
0.8
–
5.0
LDO Feedback Voltage, LFB Pin Connected to LDO Pin
V_IN1 = V_IN2 = 2.8 V to 6.0 V, I_LDO = 10 mA to 1000 mA. Includes Load
Regulation Error
V_LDO
V
0.784
0.8
0.816
LDO Voltage Margining Step Size
V_MLDO
–
1.0
–
%
LDO Line Regulation
V_IN1 = V_IN2 = 2.8 V to 6.0 V, I_LDO = 1000 mA
REG_LNVLDO
%
-1.0
–
1.0
LDO Load Regulation
I_LDO = 10 mA to 1000 mA
REG_LDVLDO
%
-1.0
–
1.0
LDO Ripple Rejection, Dropout Voltage V_DO = 1.0 V, V_RIPPLE = +1.0 V p-p
V_{LDO_RR}
dB
Sinusoidal, f = 300 kHz, I_LDO = 500 mA
–
40
–
LDO Maximum Dropout Voltage (V_IN - V_LDO)
V_LDO = 2.5 V, I_LDO = 1000 mA
V_DO
V
–
–
TBD
LDO Current Sense Comparator Threshold Voltage (V_CS - V_LDO)
V_CSTH
35
45
55
mV
LDO Pin Input Current
I_LDO
1.6
2.0
2.4
mA
LDO Feedback Input Current (LFB Pin)
I_LFB
-5.0
–
5.0
µA
LDO Drive Output Current (LDRV Pin)
I_LDRV
2.0
3.6
5.0
mA
LDO Drive Current Limit (LDRV Pin)
I_DRLIM
–
3.6
–
mA
CS Pin Input Leakage Current
V_CS = 5.0 V
I_CSLK
µA
50
–
300
LDO Error Amplifier Input Impedance (LFB Pin)
R_IN
–
TBD
–
Ω
LDO Error Amplifier Output Impedance (LCMP Pin)
R_OUT
–
TBD
–
Ω
LDO Pull-Down MOSFET Q4 Current Limit
T_A = 25°C, V_BST = 8.0 V (LDO Pin)
I_{Q4_LIM}
A
–
-2.0
–
LDO Pull-Down MOSFET Q4 R_DS(ON)
I_D = 1.0 A, T_A = 25°C, V_BST = 8.0 V
R_DS(ON)
–
Ω
–
1.0
LDO Recommended Output Capacitance
C_LDO
–
10
–
µF
LDO Recommended Output Capacitor ESR
ESR_CLDO
–
TBD
–
mΩ
Thermal Shutdown (LDO Pull-Down FET Q4)
T_SD
150
170
190
°C
Thermal Shutdown Hysteresis
T_SDHys
–
15
–
°C
33702
8
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