EVAL-ADM1275EBZ【PDF 11/48 页】BOARD EVALUATION FOR ADM1275

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Sheet目录1214

7页 8页 9页 10页 [11页]12页 13页 14页 15页

Data Sheet

ADM1275

VCC

UV

VCAP

1

2

3

16 SENSE+

15 SENSE–

14 GATE

ISET

SS

TIMER

ADR

4

5

6

7

ADM1275-2

TOP VIEW

(Not to Scale)

13 GND

12 FLB

11 PWRGD

10 SCL

GPO1/ALERT1/CONV

8

9

SDA

Figure 5. ADM1275 -2 Pin Configuration

Table 6. ADM1275 -2 Pin Function Descriptions

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Mnemonic

VCC

UV

VCAP

ISET

SS

TIMER

ADR

GPO1/ALERT1/CONV

SDA

SCL

PWRGD

FLB

GND

GATE

SENSE?

SENSE+

Description

Positive Supply Input Pin. An undervoltage lockout (UVLO) circuit resets the device when a low

supply voltage is detected. GATE is held low when the supply is below UVLO. During normal

operation, this pin should remain greater than or equal to SENSE+ to ensure that specifications

are adhered to. No sequencing is required.

Undervoltage Input Pin. An external resistor divider is used from the supply to this pin to allow

an internal comparator to detect whether the supply is under the UV limit.

Internal Regulated Supply. A capacitor with a value of 1 μF or greater should be placed on this pin

to maintain good accuracy. This pin can be used as a reference to program the ISET pin voltage.

This pin allows the current limit threshold to be programmed. The default limit is set when this

pin is connected directly to VCAP. To achieve a user-defined sense voltage, the current limit can

be adjusted using a resistor divider from VCAP. An external reference can also be used.

Soft Start Pin. A capacitor is used on this pin to set the soft start ramp profile. The voltage on the

SS pin controls the current sense voltage limit, which controls the inrush current profile.

Timer Pin. An external capacitor, C TIMER , sets an initial timing cycle delay and a fault delay. The

GATE pin is pulled low when the voltage on the TIMER pin exceeds the upper threshold.

PMBus Address Pin. This pin can be tied to GND, tied to VCAP, left floating, or tied low through a

resistor to set four different PMBus addresses (see the Device Addressing section).

General-Purpose Digital Output (GPO1).

Alert (ALERT1). This pin can be configured to generate an alert signal when one or more fault or

warning conditions are detected.

Conversion (CONV). This pin can be used as an input signal to control when a power monitor

ADC sampling cycle begins.

At power-up, this pin defaults to a high impedance state. There is no internal pull-up on this pin.

Serial Data Input/Output Pin. Open-drain input/output. Requires an external resistive pull-up.

Serial Clock Pin. Open-drain input. Requires an external resistive pull-up.

Power-Good Signal. Used to indicate that the supply is within tolerance. This signal is based on

the voltage present on the FLB pin.

Foldback Pin. A foldback resistor divider is placed from the source of the FET to this pin. Foldback

is used to reduce the current limit when the source voltage drops. The foldback feature ensures

that the power through the FET is not increased beyond the SOA limits.

Chip Ground Pin.

Gate Output Pin. This pin is the high-side gate drive of an external N-channel FET. This pin is

driven by the FET drive controller, which uses a charge pump to provide a pull-up current to

charge the FET gate pin. The FET drive controller regulates to a maximum load current by

regulating the GATE pin. GATE is held low when the supply is below UVLO.

Negative Current Sense Input Pin. A sense resistor between the SENSE+ pin and the SENSE? pin

sets the analog current limit. The hot-swap operation of the ADM1275 controls the external FET

gate to maintain the sense voltage (V SENSE+ ? V SENSE? ). This pin also connects to the FET drain pin.

Positive Current Sense Input Pin. This pin connects to the main supply input. A sense resistor

between the SENSE+ pin and the SENSE? pin sets the analog current limit. The hot-swap operation

of the ADM1275 controls the external FET gate to maintain the sense voltage (V SENSE+ ? V SENSE? ).

This pin is also used to measure the supply input voltage using the ADC.

Rev. D | Page 11 of 48

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