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SP6123A Datasheet Preview

SP6123A Datasheet

Low Voltage / Synchronous Step-Down PWM Controller Ideal for 2A to 10A / Small Footprint / DC-DC Power Converters

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® SP6123/SP6123A
Low Voltage, Synchronous Step-Down PWM Controller
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
Optimized for Single Supply, 3V - 5.5V Applications
High Efficiency: Greater Than 95% Possible
GL 1
Accurate Fixed 300kHz (SP6123) or 500kHz
VCC 2
(SP6123A) Frequency Operation
GND 3
SP6123
8 Pin NSOIC
8 BST
7 GH
6 SWN
Fast Transient Response
COMP 4
5 VFB
Internal Soft Start Circuit
Accurate 0.8V Reference Allows Low Output Now Available in Lead Free Packaging
Voltages
APPLICATIONS
Resistor Programmable Output Voltage
DSP
Loss-less Current Limit with High Side RDS(ON)
Sensing
Microprocessor Core
Hiccup Mode Current Limit Protection
I/O & Logic
Dual N-Channel MOSFET Synchronous Driver
Industrial Control
Quiescent Current: 500µA, 30µA in Shutdown
Distributed Power
8-Pin Surface Mount Package
Low Voltage Power
DESCRIPTION
The SP6123 is a fixed frequency, voltage mode, synchronous PWM controller designed to
work from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high
efficiency power conversion. Requiring only few external components, the SP6123 pack-
aged in an 8-pin NSOIC, is especially suited for low voltage applications where cost, small
size and high efficiency are critical. The operating frequency is internally set to 300kHz
(SP6123) or 500kHz (SP6123A), allowing small inductor values and minimizing PC board
space. The SP6123 drives an all N-channel synchronous power MOSFET stage for improved
efficiency and includes an accurate 0.8V reference for low output voltage applications.
TYPICAL APPLICATION CIRCUIT
VIN
CB
2.2µF
CP
56pF
GL
VCC SP6123A
GND
COMP
BST
GH
SWN
VFB
RZ
15k
CC
4.7nF
MBR0530
CBST
1µF
FDS6890A
L1
1.5µH
CIN
680µF
3V to 5.5V
IN
R1
10k
COUT1
470µF
0.8V to 5.0V
2A to 10A
(1.6V, 4A shown)
VOUT
COUT2
470µF
COUT3
1µF
FDS6890A
STPS2L25U
R2
10k
Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
1
© Copyright 2004 Sipex Corporation




Sipex

SP6123A Datasheet Preview

SP6123A Datasheet

Low Voltage / Synchronous Step-Down PWM Controller Ideal for 2A to 10A / Small Footprint / DC-DC Power Converters

No Preview Available !

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.
VCC ....................................................................................................... 7V
BST .................................................................. 13.2V
BST-SWN .............................................................. 7V
All other pins ................................ -0.3V to VCC + 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 < TA < 70°C, 3.0V < VCC < 5.5V, CCOMP = 22nF, CGH = CGL = 3.3nF, VFB = 0.8V,
SWN = GND=0V, typical value for design guideline only.
PARAMETER
MIN TYP MAX UNITS
CONDITIONS
QUIESCENT CURRENT
VCC Supply Current
VCC Supply Current (Disabled)
ERROR AMPLIFIER
Error Amplifier Transconductance
COMP Sink Current
COMP Source Current
COMP Output Impedance
VFB Input Bias Current
Error Amplifier Reference
OSCILLATOR & DELAY PATH
Internal Oscillator Frequency
Internal Oscillator Frequency
Max. Controlled Duty Cycle
Minimum Duty Cycle
Minimum GH Pulse Width
0.5 1.0
30 60
0.6
15 35
15 35
3
0.788 0.8
60
60
100
0.812
270 300
450 500
90 93
100
330
550
0
250
mA
µA
mS
µA
µA
M
nA
V
kHz
kHz
%
%
ns
CURRENT LIMIT
Internal Current Limit Threshold
160 200 240 mV
Current Limit Threshold
Temperature Coefficient
0.34
Current Limit Time Constant
15
SOFT START, SHUTDOWN, UVLO
Internal Soft Start Slew Rate
SP6123A
SP6123
0.35 0.60
0.1 0.3
COMP Discharge Current
185
COMP Clamp Voltage
0.55 0.65
COMP Clamp Current
10 30
Shutdown Threshold Voltage
0.29 0.34
Shutdown Input Pull-up Current
25
VCC Start Threshold
VCC Stop Threshold
2.63 2.8
2.47 2.7
0.95
0.6
0.75
65
0.39
10
2.95
2.9
%/C
us
V/ms
V/ms
µA
V
µA
V
µA
V
V
No Switching
COMP = 0V
VFB = 0.9V, COMP = 0.9V, No Faults
VFB = 0.7V, COMP = 2V
Trimmed with Error Amp in Unity Gain
SP6123
SP6123A
Comp=0.7V
VCC > 4.5V, Ramp up COMP voltage until
GH starts switching
VCC - VSWN ; Temp = 25 °C;
VBST - VCC > 2.5V
VFB = 0.7V and 0V, measure hiccup cycle
period
COMP = 0.5V, Fault Initiated
VFB = 0.9V
COMP = 0.5V, VFB = 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


Part Number SP6123A
Description Low Voltage / Synchronous Step-Down PWM Controller Ideal for 2A to 10A / Small Footprint / DC-DC Power Converters
Maker Sipex
Total Page 18 Pages
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1 SP6123 Low Voltage / Synchronous Step-Down PWM Controller Ideal for 2A to 10A / Small Footprint / DC-DC Power Converters
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