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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.
V CC ....................................................................................................... 7V
BST .................................................................. 13.2V
BST-SWN .............................................................. 7V
All other pins ................................ -0.3V to V CC + 0.3V
Peak Output Current < 10 μ s
GH,GL .................................................................. 2A
Storage Temperature ........................ -65 ° C to 150 ° C
Power Dissipation
Lead Temperature (Soldering, 10 sec) ............ 300 ° C
ESD Rating. ................................................ 2kV HBM
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: 0 ° C < T A < 70 ° C, 3.0V < V CC < 5.5V, C COMP = 22nF, CGH = CGL = 3.3nF, V FB = 0.8V,
SWN = GND=0V, typical value for design guideline only.
PARAMETER
MIN
TYP MAX
UNITS
CONDITIONS
QUIESCENT CURRENT
V CC Supply Current
V CC Supply Current (Disabled)
0.5
30
1.0
60
mA
μ A
No Switching
COMP = 0V
ERROR AMPLIFIER
Error Amplifier Transconductance
0.6
mS
COMP Sink Current
COMP Source Current
15
15
35
35
60
60
μ A
μ A
V FB = 0.9V, COMP = 0.9V, No Faults
V FB = 0.7V, COMP = 2V
COMP Output Impedance
V FB Input Bias Current
3
100
M ?
nA
Error Amplifier Reference
0.788 0.8
0.812
V
Trimmed with Error Amp in Unity Gain
OSCILLATOR & DELAY PATH
Internal Oscillator Frequency
Internal Oscillator Frequency
Max. Controlled Duty Cycle
Minimum Duty Cycle
Minimum GH Pulse Width
270
450
90
300
500
93
100
330
550
0
250
kHz
kHz
%
%
ns
SP6123
SP6123A
Comp=0.7V
V CC > 4.5V, Ramp up COMP voltage until
GH starts switching
CURRENT LIMIT
Internal Current Limit Threshold
160
200
240
mV
V CC - V SWN ; Temp = 25 ° C;
V BST - V CC > 2.5V
Current Limit Threshold
Temperature Coefficient
Current Limit Time Constant
SOFT START, SHUTDOWN, UVLO
Internal Soft Start Slew Rate
0.34
15
%/C
us
SP6123A
SP6123
COMP Discharge Current
0.2
0.1
185
0.60
0.3
0.95
0.6
V/ms
V/ms
μ A
COMP = 0.5V, Fault Initiated
COMP Clamp Voltage
0.55 0.65
0.75
V
V FB = 0.9V
COMP Clamp Current
10
30
65
μ A
COMP = 0.5V, V FB = 0.9V
Shutdown Threshold Voltage
0.29 0.34
0.39
V
Measured at COMP Pin
Shutdown Input Pull-up Current
V CC Start Threshold
V CC Stop Threshold
2
2.63
2.47
5
2.8
2.7
10
2.95
2.9
μ A
V
V
COMP = 0.2V, Measured at COMP pin
Date: 9/13/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
2
? Copyright 2004 Sipex Corporation
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