SP6120 Datasheet, PDF (4/22 Pages) Sipex Corporation – Low Voltage, AnyFETTM, Synchronous ,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters

NAME
N/C
ENABLE
ISP
ISN
V_FB
COMP
SS
R_OSC
PROG
V_CC
GL
PGND
GND
SWN
GH
BST
FUNCTION
PIN DESCRIPTION
PIN
NUMBER
SP6120
No Connection
1
TTL compatible input with internal 4uA pullup. Floating or Venable> 1.5V
will enable the part, Venable < 0.65V disables part.
2
Current Sense Positive Input: Rail to Rail Input for Over-Current Detection,
43mV threshold with 10µs (typ) response time.
3
Current Sense Negative Input: Rail to Rail input for Over-Current
Detection.
4
Feedback Voltage Pin: Inverting input of the error amplifier and serves as
the output voltage feedback point for the buck converter. The output
5
voltage is sensed and can be adjusted through an external resistor divider.
Error Amplifier Compensation Pin: A lead lag network is typically
connected to this pin to compensate the feedback loop. This pin is
6
clamped by the SS voltage and is limited to 2.8V maximum.
Soft Start Programming Pin: This pin sources 50µA on start-up. A 0.01µF
to 1µF capacitor on this pin is typically enough capacitance to soft start a
power supply. In addition, hiccup mode timing is controlled by this pin
7
through the 5µA discharge current. The SS voltage is clamped to 2.7V
maximum.
Frequency Programming Pin: A resistor to ground is used to program
frequency. Typical values - 18,700 Ohms, 300kHz; 10,200 Ohms, 500kHz.
8
Programming Pin:
PROG = GND; MODE = NFET/CONTINOUS
PROG = 68kΩ to GND; MODE = NFET/DISCONTINOUS
9
PROG = V_CC; MODE = PFET/CONTINOUS
PROG = 68kΩ to V_CC; MODE = PFET/DISCONTINOUS
I.C. Supply Pin: ESD structures also hooked to this pin. Properly bypass
this pin to PGND with a low ESL/ESR ceramic capacitor.
10
Synchronous FET Driver: 1nF/20ns typical drive capability.
11
Power Ground Pin: Used for Power Stage. Connect Directly to GND at
I.C. pins for optimal performance.
12
Ground Pin: Main ground pin for I.C.
13
Switch Node Reference: High side MOSFET driver reference. Can also be
tied to GND for low voltage applications.
14
HIgh Side MOSFET Driver: Can be NFET or PFET depending on Program
Mode. 1nF/20ns typical drive capability. Maximum voltage rating is
15
referenced to SWN.
High Side Driver Supply Pin.
16
Date: 1/21/05
SP6120 Low Voltage, AnyFET^TM, Synchronous, Buck Controller
4
© Copyright 2005 Sipex Corporation