MAX1960 データシートの表示（PDF） - Maxim Integrated

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MAX1960

2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

Maxim Integrated 

2.35V to 5.5V, 0.5% Accurate, 1MHz PWM

Step-Down Controllers with Voltage Margining

Pin Description

PIN

MAX1960 MAX1961 MAX1962

NAME

FUNCTION

Clock Output. Connect to FSET/SYNC of a second converter to operate 180° out-of-

1

1

1

CLKOUT phase. CLKOUT swings from VCC to GND. CLKOUT is low in shutdown (see the

Operating Frequency and Synchronization section).

Frequency Set and Synchronization. Connect to GND for 500kHz operation,

2

2

2

FSET/SYNC connect to VCC for 1MHz operation, or drive with clock signal to synchronize

(between 450kHz and 1200kHz).

3

3

—

ILIM

Current Limit. Connect a resistor from ILIM to GND to set the current-sense

threshold voltage. Connect ILIM to VDD to select the default threshold of 75mV.

—

—

3

EN

Enable. Drive high for normal operation. Drive low or connect to GND for shutdown mode.

—

4

Preset Output Voltage Select. Allows the output to be set to one of four preset

4

SEL

voltages (1.5V, 1.8V, 2.5V, and 3.3V). For the MAX1962, FB must be connected to

VDD if SEL is to be used (see the Setting the Output Voltage section).

4

—

—

N.C.

No Connection. Not internally connected.

—

8

5

OUT

Output. Connect to the output. Used to sense the output voltage for internal

feedback and current sense.

Control Pins. Controls voltage margining and shutdown. Connect both CTL1 and

5

5

—

CTL1

CTL2 high for normal operation. Connect both CTL1 and CTL2 low for shutdown.

Connect CTL1 high and CTL2 low for +4% voltage margining. Connect CTL1 low

6

6

—

CTL2

and CTL2 high for -4% voltage margining. If voltage margining is not to be used,

connect CTL1 and CTL2 together and use to enable/shutdown the device.

—

—

6

CS

Current-Sense Input. Connect to the junction of the current-sense resistor and the

inductor. The MAX1962 current-sense threshold is 50mV measured from CS to OUT.

7

7

7

AVDD

Filtered Supply from VDD. Connect a 1µF bypass capacitor. AVDD is forced to VCC

in shutdown. Do not apply an external load to AVDD.

8

—

8

Feedback Input. The feedback threshold is 0.8V. Connect to the center of a resistive

FB

voltage-divider from the output to GND to set the output voltage to 0.8V or greater. On

the MAX1962, connect FB to VDD to select preset output voltages (see SEL).

9

9

9

COMP Compensation Pin. COMP is forced to GND in shutdown, UVLO, or thermal fault.

10

10

10

REF

Reference Output. VREF = 1.28V. Bypass with a 0.22µF capacitor to GND.

11

11

11

GND

Analog Ground. Connect to the PC board analog ground plane. Connect the PC

board analog ground plane and power ground planes with a single connection.

Charge-Pump Output. Provides regulated 5V to power the IC and gate drivers.

Bypass with a 4.7µF ceramic capacitor for operating frequencies between 450kHz

12

12

12

VDD

and 950kHz. Bypass with a 2.2µF ceramic capacitor for 1MHz operation. VDD is

internally forced to VCC in shutdown. Do not apply an external load to VDD.

13

13

13

DL

Low-Side MOSFET Synchronous Rectifier Gate-Driver Output. DL is high in

shutdown.

14

14

14

PGND Power Ground. Connect to the PC board power ground plane.

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