ZL2004 datasheet(11/42 Pages) RENESAS

11 / 42 page

ZL2004

FN6846 Rev. 3.00

Page 11 of 42

February 15, 2011

and adaptive frequency are available to provide greater

efficiency improvement.

The ZL2004 can also be used with a single-ended

MOSFET driver. Simple parameter changes allow the

device to use a single PWM to drive the logic input of

such drivers. The trade-offs for using this mode may

include reduced efficiency, reduced ramp-up timing

accuracy, and degraded pre-bias protection.

4.3 Power Management Overview

The ZL2004 incorporates a wide range of configurable

power management features that are simple to

implement with no external components. Additionally,

the ZL2004 includes circuit protection features that

continuously safeguard the device and load from

damage due to unexpected system faults. The ZL2004

can

continuously

monitor

input

voltage,

output

voltage/current,

internal

temperature,

and

the

temperature of an external thermal diode. A Power

Good output signal is also included to enable power-on

reset functionality for an external processor.

All power management functions can be configured

using either pin configuration techniques (see Figure 6)

or via the I

2C/SMBus interface. Monitoring parameters

can also be pre-configured to provide alerts for specific

conditions. See Application Note AN33 for more

details on SMBus monitoring.

4.4 Multi-mode Pins

In order to simplify circuit design, the ZL2004

incorporates patented multi-mode pins that allow the

user to easily configure many aspects of the device

with no programming. Most power management

features can be configured using these pins. The multi-

mode pins can respond to four different connections as

shown in Table 5. These pins are sampled when power

is applied or by issuing a PMBus Restore command

(See Application Note AN33).

Pin-strap Settings: This is the simplest implementation

method, as no external components are required. Using

this method, each pin can take on one of three possible

states: LOW, OPEN, or HIGH. These pins can be

connected to the V25 pin for logic HIGH settings as

this pin provides a regulated voltage higher than 2 V.

Using a single pin, one of three settings can be

selected. Using two pins, one of nine settings can be

selected.

Table 5. Multi-mode Pin Configuration

Pin Tied To

Value

LOW

(Logic LOW)

< 0.8 VDC

OPEN

(N/C)

No connection

HIGH

(Logic HIGH)

> 2.0 VDC

Resistor to SGND

Set by resistor value

Multi-mode Pin

RSET

Logic

high

Logic

low

Open

Pin-strap

Settings

Resistor

Settings

Multi-mode Pin

Figure 6. Pin-strap and Resistor Setting Examples

Resistor Settings: This method allows a greater range

of adjustability when connecting a finite value resistor

(in a specified range) between the multi-mode pin and

SGND. Standard 1% resistor values are used, and only

every fourth E96 resistor value is used so the device

can

reliably

recognize

the

value

resistance

connected to the pin while eliminating the error

associated with the resistor accuracy. Up to 31 unique

selections are available using a single resistor.

2C/SMBus Method: Almost any ZL2004 function can

be configured via the I

2C/SMBus interface using

standard PMBus commands. Additionally, any value

that has been configured using the pin-strap or resistor

setting methods can also be re-configured and/or

verified via the I

2C/SMBus. See Application Note

AN33 for more details.

The SMBus device address and VOUT_MAX are the

only parameters that must be set by external pins. All

other device parameters can be set via the I

2C/SMBus.

The device address is set using the SA0 and SA1 pins.

VOUT_MAX is determined as 10% greater than the

voltage set by the V0 and V1 pins.

ZL2004 Datasheet(PDF) 11 Page - Renesas Technology Corp

ZL2004 Datasheet(HTML) 11 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL