SP6121CN-L Datasheet, PDF (2/42 Pages) Sipex Corporation – Low Voltage, Synchronous Step Down PWM Controller

V_CC ...................................................................................................... 7V
All other pins ............................... -0.3V to V_CC+0.3V
Peak Output Current < 10µs
PDRV, NDRV ....................................................... 2A
Storage Temperature ...................... -65°C to 150°C
Lead Temperature (Soldering, 10 sec) .......... 300°C
ESD Rating ............................................... 2kV HBM
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional
operation of the device at these ratings or any other
above those indicated in the operation sections of
the specifications below is not implied. Exposure to
absolute maximum rating conditions for extended
periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 0°C < TA < 70°C, 3.0V < VCC < 5.5V, CCOMP = 22nF, CPDRV = CNDRV = 3.3nF, VFB = 1.25V, ISET = ISENSE = VCC, GND=0V
PARAMETER
MIN TYP MAX UNITS CONDITIONS
QUIESCENT CURRENT
V_CC Supply Current
V_CC Supply Current (Disabled)
ERROR AMPLIFIER
-
0.5 1.0 mA No Switching
-
25 60 µA COMP = 0V
Error Amplifier Transconductance
600
µs
COMP Sink Current
COMP Source Current
COMP Output Impedance
15
35
65
µA V_FB = 1.35V, COMP=0.8V, No Faults
15
35
65
µA V_FB =1.15V, COMP=1.8V
3
MΩ
V_FB Input Bias Current
100
nA
ERROR AMPLIFIER REFERENCE
Initial Accuracy
1.238 1.250 1.262 V Trimmed with Error Amp in Unity Gain
Error Amplifier Reference over
Line, Load and Temperature
1.225 1.250 1.275 V
OSCILLATOR & DELAY PATH
Internal Oscillator Frequency
440 500 560 kHz
Maximum Duty Cycle
100
-
-
% COMP = 2V
Minimum Duty Cycle
Minimum PDRV Pulse Width
-
-
0
% COMP = 0.8V
100
ns V_CC > 4.5V, Ramp up COMP voltage
until PDRV starts switching
CURRENT LIMIT
Internal Current Limit Threshold
ISET Sink Current
Current Limit Threshold and
ISET Temperature Coefficient
125 160 195 mV V_ISET - V_ISENSE, T_A = 25°C
25
30
35
µA V_ISET =5V, T_A = 25°C
0.33
%/C
Current Limit Time Constant
ISENSE Input Bias Current
15
µs
-
-
100 nA
SOFT START, SHUTDOWN, UVLO
Internal Soft Start Slew Rate
0.4
V/ms Measured at COMP pin on the
transition from shutdown
Internal Soft Start Delay Time
1.5
ms COMP charging to PDRV switching
COMP Discharge Current
COMP Clamp Voltage
COMP Clamp Current
150 300
0.6 0.7 0.8
100
µA COMP = 0.5V, Fault Initiated
V V_FB = 1.3V
µA COMP = 0.5V, V_FB =1.15V
Date: 11/29/04
SP6121 Low Voltage, Synchronous Step Down PWM Controller
2
© Copyright 2004 Sipex Corporation