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PDF PM6680A Data sheet ( Hoja de datos )
| Número de pieza | PM6680A | |
| Descripción | DUAL STEP-DOWN CONTROLLER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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PM6680A
Dual syncronous step-down controller
with adjustable output voltages plus LDO
Preliminary Data
Features
■ 6V to 36V input voltage range
■ Adjustable output voltages
■ 5V LDO delivers 100mA peak current
■ 1.237V ±1% reference voltage available
externally
■ Current sensing using low side MOSFETs
RDS(on)
■ Accurate current sense with RSENSE
■ Valley current sensing
■ Soft-start internally fixed at 2ms
■ Soft output discharge
■ Latched OVP and UVP
■ Selectable pulse skipping at light loads
■ Selectable minimum frequency (33kHz) in
pulse skip mode
■ 5mW maximum quiescent power
■ Independent power good signals
■ Output voltage ripple compensation
■ Thermal shutdown
Applications
■ Embedded computer system
■ FPGA system power
■ Industrial applications on 24V
■ High performance and high density DC/DC
modules
VFQFPN-32 5X5
Description
PM6680A is a dual step-down controller
specifically designed to provide extremely high
efficiency conversion, with losses current sensing
technique. The constant on-time architecture
assures fast load transient response and the
embedded voltage feed-forward provides nearly
constant switching frequency operation. An
embedded integrator control loop compensates
the DC voltage error due to the output ripple.
Pulse skipping technique increases efficiency at
very light load. Moreover a minimum switching
frequency of 33kHz is selectable to avoid audio
noise issues. The PM6680A provides a selectable
switching frequency, allowing either
200kHz/300kHz, 300kHz/400Khz or
400kHz/500kHz operation of the two switching
sections. The output voltages OUT1 and OUT2
can be adjusted from 0.9V to 5V and from 0.9V to
3.3V respectively.
Order codes
Part number
PM6680A
Package
VFQFPN-32 5X5 (Exposed Pad)
Packaging
Tube
October 2006
Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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PM6680A
2.2 Functions
Pin settings
Table 1. Pin functions
N° Pin
Function
1 SGND1 Signal ground. Reference for internal logic circuitry.
2 COMP2 Static error compensation pin for the switching section 2
Frequency selection pin. It provides a selectable switching frequency,
3
FSEL
allowing either 200kHz/300kHz, 300kHz/400kHz or 400kHz/500kz operation
of the switching sections.
Enable input for the switching section 2. When a high logic level ( >2.4V ) is
present on this pin, it enables this section, while with a low logic level (
4 EN2 <0.8V ) the device disables the switching section where HS gate driver
goes low while LS gate driver goes high. Note that if both enable pins are
low and SHDN is high the device enters in standby mode.
Shutdown control input. The device enters in its shutdown mode with 9µA of
supply current if VSHDN is less than the device off threshold and doesn’t
5
SHDN
restart until VHSDN is greater then the device on threshold. Note that in
shutdown mode both gate drivers of the two switching sections are in high
impedance.
6 NC Not connected.
Feedback input for the switching section 2 This pin is connected to a
7 FB2 resistive voltage-divider from OUT2 to PGND to adjust the output voltage
from 0.9V to 3.3V.
8
OUT2
Output voltage sense for the switching section 2.This pin must be directly
connected to the output voltage of the switching section.
9
BOOT2
Bootstrap capacitor connection for the switching section 2. It supplies the
high-side gate driver.
10
HGATE2
High-side gate driver output for section 2. This is the floating gate driver
output.
11
PHASE2
Switch node connection and return path for the high side driver for the
section 2.It is also used as negative current sense input.
Positive current sense input for the switching section 2. This pin must be
connected through a resistor to the drain of the synchronous rectifier
12 CSENSE2 (RDSON sensing) or to the source of the synchronous rectifier (RSENSE
sensing) to obtain a positive current limit threshold for the power supply
controller.
13 LGATE2 Low-side gate driver output for the section 2.
14
PGND
Power ground reference.
15 LGATE1 Low-side gate driver output for the section 1.
16 SGND2 Signal ground. Reference for internal logic circuitry.
Internal 5V regulator bypass connection. When the main output voltage is
greater than the boostrap-switchover threshold, an internal 3Ω (max) P-
17
V5SW
channel MOSFET switch connects V5SW pin to LDO5 pin shutting down the
LDO5 internal linear regulator.If not used, it must be tied to ground.
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PM6680A
5 Application schematic
Figure 3. Simplified application schematic
Application schematic
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| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet PM6680A.PDF ] | |
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