SP6120B Datasheet, PDF (4/22 Pages) Sipex Corporation – Low Voltage, AnyFETTM, Synchronous ,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters

PIN DESCRIPTION
NAME
1
2
FUNCTION
N/C
ENABLE
3
ISP
4
ISN
5
V_FB
6
COMP
7
SS
8
R_OSC
9
PROG
10
V_CC
11
GL
12
PGND
13
GND
14
SWN
15
GH
16
BST
PIN NUMBER
No Connection
TTL compatible input with internal 4uA pullup. Floating or Venable> 1.5V will
enable the part, Venable < 0.65V disables part.
Current Sense Positive Input: Rail to Rail Input for Over-Current Detection,
43mV threshold with 10µs (typ) response time.
Current Sense Negative Input: Rail to Rail input for Over-Current Detection.
Feedback Voltage Pin: Inverting input of the error amplifier and serves as the
output voltage feedback point for the buck converter. The output 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 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 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 - 18,700Ω, 300kHz; 10,200Ω, 500kHz.
Programming Pin:
PROG = GND; MODE = NFET/CONTINOUS
PROG = 68kΩ to GND; MODE = NFET/DISCONTINOUS
PROG = VCC; MODE = PFET/CONTINOUS
PROG = 68kΩ to VCC; 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.
Synchronous FET Driver: 1nF/20ns typical drive capability.
Power Ground Pin: Used for Power Stage. Connect Directly to GND at I.C.
pins for optimal performance.
Ground Pin: Main ground pin for I.C.
Switch Node Reference: High side MOSFET driver reference. Can also be
tied to GND for low voltage applications.
HIgh Side MOSFET Driver: Can be NFET or PFET depending on Program
Mode. 1nF/20ns typical drive capability. Maximum voltage rating is
referenced to SWN.
High Side Driver Supply Pin. When V_BST is less than V_BST OK Threshold, GL
is forced to turn on for at least 300ns. This is intended for enough time to
charge the BST capacitor.
Date: 5/25/04
SP6120B Low Voltage, AnyFET^TM, Synchronous, Buck Controller
4
© Copyright 2004 Sipex Corporation