SP6123 Datasheet, PDF (2/18 Pages) Sipex Corporation – Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters

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 < 10µs
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)
ERROR AMPLIFIER
0.5 1.0 mA
30 60 µA
Error Amplifier Transconductance
0.6
mS
COMP Sink Current
15 35 60 µA
COMP Source Current
15 35 60 µA
COMP Output Impedance
3
MΩ
V_FB Input Bias Current
Error Amplifier Reference
100 nA
0.788 0.8 0.812 V
OSCILLATOR & DELAY PATH
Internal Oscillator Frequency
270 300 330 kHz
Internal Oscillator Frequency
450 500 550 kHz
Max. Controlled Duty Cycle
90 93
%
Minimum Duty Cycle
0
%
Minimum GH Pulse Width
100 250 ns
CURRENT LIMIT
Internal Current Limit Threshold
160 200 240 mV
Current Limit Threshold
0.34
Temperature Coefficient
Current Limit Time Constant
15
SOFT START, SHUTDOWN, UVLO
Internal Soft Start Slew Rate
SP6123A
SP6123
0.35 0.60 0.95
0.1 0.3 0.6
COMP Discharge Current
185
COMP Clamp Voltage
0.55 0.65 0.75
COMP Clamp Current
10 30 65
Shutdown Threshold Voltage
0.29 0.34 0.39
Shutdown Input Pull-up Current
2 5 10
V_CC Start Threshold
V_CC Stop Threshold
2.63 2.8 2.95
2.47 2.7 2.9
%/C
us
V/ms
V/ms
µA
V
µA
V
µA
V
V
No Switching
COMP = 0V
V_FB = 0.9V, COMP = 0.9V, No Faults
V_FB = 0.7V, COMP = 2V
Trimmed with Error Amp in Unity Gain
SP6123
SP6123A
Comp=0.7V
V_CC > 4.5V, Ramp up COMP voltage until
GH starts switching
V_CC - V_SWN ; Temp = 25 °C;
V_BST - V_CC > 2.5V
V_FB = 0.7V and 0V, measure hiccup cycle
period
COMP = 0.5V, Fault Initiated
V_FB = 0.9V
COMP = 0.5V, V_FB = 0.9V
Measured at COMP Pin
COMP = 0.2V, Measured at COMP pin
Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
2
© Copyright 2004 Sipex Corporation