LINEAR TECHNOLOGY LTC3714 Technical data

LTC3714

Intel Compatible,

Wide Operating Range, Step-Down Controller

FEATURES

■

True Current Mode with Ultrafast Transient

Response

■

Stable with Ceramic C

■

t

ON(MIN)

< 100ns for Operation from High Input

OUT

Ranges

■

Supports Active Voltage Positioning

■

No Sense Resistor Required

■

5-Bit VID Programmable Output Voltage: 0.6V to 1.75V

■

Dual N-Channel MOSFET Synchronous Drive

■

Programmable Output Offsets

■

Power Good Output Voltage Monitor

■

Wide VIN Range: 4V to 36V

■

±1% 0.6V Reference

■

Adjustable Frequency

■

Programmable Soft-Start

■

Output Overvoltage Protection

■

Optional Short-Circuit Shutdown Timer

■

Forced Continuous Control Pin

■

Logic Controlled Micropower Shutdown: IQ ≤ 30µA

■

Available in 0.209" Wide 28-Lead SSOP Package

U

APPLICATIO S

■

Power Supply for Mobile Pentium® Processors and
Transmeta Processors

■

Notebook and Portable Computers

with Internal Op Amp

U

DESCRIPTIO

The LTC®3714 is a synchronous step-down switching
regulator controller for CPU power. An output voltage
between 0.6V and 1.75V is selected by a 5-bit code (Intel
mobile VID specification). The controller uses a constant
on-time, valley current control architecture to deliver very
low duty cycles without requiring a sense resistor. Oper­ating frequency is selected by an external resistor and is
compensated for variations in VIN and V

Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference and can assist second­ary winding regulation by disabling discontinuous mode
when the main output is lightly loaded. Internal op amp
allows programmable offsets to the output voltage during
power saving modes.

Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and optional
short-circuit shutdown timer. Soft-start capability for sup­ply sequencing is accomplished using an external timing
capacitor. The regulator current limit level is user pro­grammable. Wide supply range allows operation from 4V
to 36V at the input.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Pentium is a registered trademark of Intel Corporation.

OUT

.

TYPICAL APPLICATIO

INTV

CC

C

SS

0.1µF

C

C

5-BIT

VID

*OPTIONAL

LTC3714

PGOOD

RUN/SS

I

TH

R

C

SGND

VID4
VID3
VID2
VID1
VID0

BOOST

INTV

SENSE

V

OSENSE

Figure 1. High Efficiency Step-Down Converter

PGND

R

ON

I

ON

V

IN

TG

SW

CB, 0.22µF

D
CMDSH-3

CC

BG

+

B

C

VCC

4.7µF

M1
IRF7811
×2

M2
IRF7811
×3

0.003Ω*

L1

0.68µH

U

D1*
UPS840

+

3714 F01

10µF
35V
×4

C

OUT

270µF
2V
×4

V

IN

5V TO 24V

V

OUT

0.6V TO 1.75V
23A

Transient Response of 8A to 23A Output Load Step

1.395V

V

OUT

(1.35V)
50mV/DIV

1.213V

23A

I

LOAD

10A/DIV

8A

20µs/DIV

3714 TA03

3714f

1

LTC3714

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Input Supply Voltage (VIN), ION..................36V to –0.3V

Boosted Topside Driver Supply Voltage

(BOOST) ................................................... 42V to –0.3V

SW, SENSE Voltages ................................... 36V to –5V

EXTVCC, (BOOST – SW), RUN/SS, VID0-VID4,

PGOOD, FCB Voltages ............................... 7V to –0.3V

VON, V
ITH, VFB, V

TG, BG, INTVCC, EXTVCC Peak Currents.................... 2A

TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA

OPVIN, OP+, OP
Operating Ambient Temperature Range

LTC3714EG (Note 2) .......................... –40°C to 85°C

Junction Temperature (Note 3)............................ 125°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)..................300°C

Voltages ................(INTVCC + 0.3V) to –0.3V

RNG

Voltages....................... 2.7V to –0.3V

OSENSE

–

.......................................................

0V to 18V

UU

W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

1

BG

2

PGND

3

SENSE

4

SW

5

TG

6

BOOST

7

VID0

8

VID1

9

VID2

10

RUN/SS

11

V

ON

12

PGOOD

13

V

RNG

14

I

TH

28-LEAD PLASTIC SSOP

T

JMAX

G PACKAGE

= 125°C, θJA = 130°C/W

INTV

28

CC

V

27

IN

EXTV

26

CC

VID4

25

VID3

24

V

23

OSENSE

VFB

22

I

21

ON

FCB

20

SGND

19

OPOUT

18

+

OP

17

–

OP

16

OPV

15

IN

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ORDER PART

NUMBER

LTC3714EG

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop

I

Q

V

FB

∆V

FB(LINEREG)

∆V

FB(LOADREG)

g

m(EA)

V

FCB

I

FCB

t

ON

t

ON(MIN)

t

OFF(MIN)

V

SENSE(MAX)

V

SENSE(MIN)

∆V

FB(OV)

∆V

FB(UV)

V

RUN/SS(ON)

Input DC Supply Current
Normal 900 2000 µA
Shutdown Supply Current 15 30 µA

Feedback Reference Voltage ITH = 1.2V (Note 4) ● 0.594 0.600 0.606 V
Feedback Voltage Line Regulation VIN = 4V to 30V (Note 4), ITH = 1.2V 0.002 %/V
Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 4) ● –0.05 –0.3 %
Error Amplifier Transconductance ITH = 1.2V (Note 4) ● 1.4 1.7 2 ms
Forced Continuous Threshold ● 0.57 0.6 0.63 V
Forced Continuous Current V

= 0.6V –1 –2 µA

FCB

On-Time ION = 60µA, VON = 1.5V 200 250 300 ns
Minimum On-Time ION = 180µA, VON = 0V 50 100 ns
Minimum Off-Time ION = 60µA, VON = 1.5V 250 400 ns
Maximum Current Sense Threshold V

Minimum Current Sense Threshold V

= 1V, VFB = 0.56V ● 113 133 153 mV

RNG

= 0V, VFB = 0.56V ● 79 93 107 mV

V

RNG

= INTVCC, VFB = 0.56V ● 158 186 214 mV

V

RNG

= 1V, VFB = 0.64V –67 mV

RNG

V

= 0V, VFB = 0.64V –33 mV

RNG

= INTVCC, VFB = 0.64V –93 mV

V

RNG

Output Overvoltage Fault Threshold 7.5 10 12.5 %
Output Undervoltage Fault Threshold 340 400 460 mV
RUN Pin Start Threshold ● 0.8 1.5 2 V

3714f

2

LTC3714

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

RUN/SS(LE)

V

RUN/SS(LT)

I

RUN/SS(C)

I

RUN/SS(D)

V

IN(UVLO)

V

IN(UVLOR)

TG R

UP

TG R

DOWN

BG R

UP

BG R

DOWN

TG t

r

TG t

f

BG t

r

BG t

f

Internal VCC Regulator

V

INTVCC

∆V

LDO(LOADREG)

V

EXTVCC

∆V

EXTVCC

∆V

EXTVCC(HYS)

PGOOD Output

∆V

FBH

∆V

FBL

∆V

FB(HYS)

V

PGL

VID DAC

V

VID(T)

I

VID(PULLUP)

V

VID(PULLUP)

I

VID(LEAK)

R

VID

∆V

OSENSE

RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 4 4.5 V
RUN Pin Latchoff Threshold RUN/SS Pin Falling 3.5 4.2 V
Soft-Start Charge Current –0.5 –1.2 –3 µA
Soft-Start Discharge Current 0.8 1.8 3 µA
Undervoltage Lockout Threshold VIN Falling ● 3.4 3.9 V
Undervoltage Lockout Threshold VIN Rising ● 3.5 4 V
TG Driver Pull-Up On Resistance TG High 2 3 Ω
TG Driver Pull-Down On Resistance TG Low 2 3 Ω
BG Driver Pull-Up On Resistance BG High 3 4 Ω
BG Driver Pull-Down On Resistance BG Low 1 2 Ω
TG Rise Time C
TG Fall Time C
BG Rise Time C
BG Fall Time C

Internal VCC Voltage 6V < VIN < 30V, V
Internal VCC Load Regulation ICC = 0mA to 20mA, V
EXTVCC Switchover Voltage ICC = 20mA, V
EXTVCC Switch Drop Voltage ICC = 20mA, V

= 3300pF 20 ns

LOAD

= 3300pF 20 ns

LOAD

= 3300pF 20 ns

LOAD

= 3300pF 20 ns

LOAD

= 4V ● 4.7 5 5.3 V

EXTVCC

= 4V –0.1 ±2%

EXTVCC

Rising ● 4.5 4.7 V

EXTVCC

= 5V 150 300 mV

EXTVCC

EXTVCC Switchover Hysteresis 200 mV

PGOOD Upper Threshold VFB Rising 7.5 10 12.5 %
PGOOD Lower Threshold VFB Falling –7.5 –10 –12.5 %
PGOOD Hysteresis VFB Returning 1 2.5 %
PGOOD Low Voltage I

= 1mA 0.15 0.4 V

PGOOD

VID0-VID4 Logic Threshold Voltage 0.4 1.2 2 V
VID0-VID4 Pull-Up Current V
VID0-VID4 Pull-Up Voltage V
VID0-VID4 Leakage Current V
Resistance from V

OSENSE

to V

FB

DAC Output Accuracy V

to V

VID0

VID0

VID0

= 0V –2.5 µA

VID4

to V

Open 4.5 V

VID4

to V

VID4

= 5V, V

= 0V 0.01 1 µA

RUN/SS

61014 KΩ

Programmed from –0.45 0 0.25 %

OSENSE

0.6V to 1.75V (Note 5)

VIN = 5V unless otherwise noted.

Internal Op Amp

V

OS

I

OS

I

B

Input Offset Voltage 400 1000 µV
Input Offset Current 410 nA
Input Bias Current 45 80 nA

CMRR Common Mode Rejection Ratio VCM = 0V to (VCC – 1V) 100 dB

= 0V to 18V 80 dB

V

CM

3714f

3

LTC3714

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 5V unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

PSRR Power Supply Rejection Ratio OPVIN = 3V to 12.5V, OP
A

VOL

V

OL

V

OH

I

SC

I

S

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC3714E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.

Note 3: T

dissipation P

LTC3714EG: TJ = TA + (PD • 130°C/W)

Large-Signal Voltage Gain OPVIN = 5V, OP
Output Voltage Swing LOW OPVIN = 5V, I
Output Voltage Swing HIGH OPVIN = 5V, I
Short-Circuit Current Short to GND 30 mA

Short to OPV

Supply Current 170 300 µA

is calculated from the ambient temperature TA and power

J

as follows:

D

= 500mV to 4.5V, RL = 10k 1500 V/mV

OUT

= 5mA ● 165 500 mV

SINK

SOURCE

IN

= VO = 1V 100 dB

OUT

= 5mA ● 4.5 4.87 V

40 mA

Note 4: The LTC3714 is tested in a feedback loop that adjusts V

achieve a specified error amplifier output voltage (I

Note 5: The LTC3714 VID DAC is tested in a feedback loop that adjusts

V

to achieve a specified feedback voltage (VFB = 0.6V) for each DAC

OSENSE

VID code.

).

TH

to

FB

4

3714f

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Transient Response

Transient Response

(Discontinuous Mode)

LTC3714

Start-Up

V

OUT

50mV/DIV

I

L

5A/DIV

LOAD STEP 0A TO 10A
V

= 15V

IN

= 1.5V

V

OUT

FCB = 0V
FIGURE 1 CIRCUIT

Efficiency vs Load Current

95

90

85

80

EFFICIENCY (%)

75

70

0

VIN = 8.5V

VIN = 15V

VIN = 24V

V

= 1.35V

OUT

FREQUENCY = 300kHz
FIGURE 1 CIRCUIT

3 6 9 12 15 18 21

LOAD CURRENT (A)

20µs/DIV

3714 G03

3714 G01

V

OUT

50mV/DIV

5A/DIV

I

L

LOAD STEP 1A TO 10A
V

= 15V

IN

= 1.5V

V

OUT

FCB = INTV
FIGURE 1 CIRCUIT

CC

20µs/DIV

3714 G02

RUN/SS

2V/DIV

V

OUT

500mV/DIV

5A/DIV

I

L

VIN = 15V
V
R

OUT
LOAD

= 1.25V

= 0.125Ω

Efficiency vs Input Voltage Frequency vs Input Voltage

100

90

80

EFFICIENCY (%)

70

60

0

I

= 10A

OUT

I

OUT

I

OUT

5101520

INPUT VOLTAGE (V)

= 1A

= 23A

25 30

3714 G04

300

FCB = 0V
FIGURE 1 CIRCUIT

280

260

240

FREQUENCY (kHz)

220

200

5

10

INPUT VOLTAGE (V)

50ms/DIV 3714 G19

I

= 10A

OUT

I

= 0A

OUT

15

20

3714 G05

25

Load Regulation

0

–0.1

(%)

–0.2

OUT

∆V

–0.3

–0.4

0

2

4

LOAD CURRENT (A)

FIGURE 1 CIRCUIT

NO AVP

6

8

3714 G06

Current Sense Threshold

ITH Voltage vs Load Current

2.5
FIGURE 1 CIRCUIT

2.0

1.5

CONTINUOUS

VOLTAGE (V)

1.0

TH

I

0.5

0

10

0

MODE

DISCONTINUOUS
MODE

5

LOAD CURRENT (A)

10

15

3714 G07

vs ITH Voltage

300

200

100

0

–100

CURRENT SENSE THRESHOLD (mV)

–200

0

1.0 1.5 2.0

0.5
ITH VOLTAGE (V)

RNG

=

2V

1.4V

1V

0.7V

0.5V

2.5 3.0

3714 G08

3714f

V

5

LTC3714

TEMPERATURE (°C)

–50

ON-TIME (ns)

200

250

300

25 75

3714 G22

150

100

–25 0

50 100 125

50

0

I

ION

= 30µA

V

VON

= 0V

UW

TYPICAL PERFOR A CE CHARACTERISTICS

On-Time vs ION Current

10k

1k

ON-TIME (ns)

100

10

1

ION CURRENT (µA)

Maximum Current Sense

Threshold vs V

300

250

200

150

100

50

V

= 0V

VON

10 100

3714 G20

Voltage

RNG

On-Time vs VON Voltage On-Time vs Temperature

1000

I

= 30µA

ION

800

600

400

ON-TIME (ns)

200

0

0

1

VON VOLTAGE (V)

Maximum Current Sense

Threshold vs RUN/SS Voltage

150

125

100

= 1V

V

RNG

75

50

25

2

3

3714 G21

Maximum Current Sense

Threshold vs Temperature

150

V

= 1V

RNG

140

130

120

110

MAXIMUM CURRENT SENSE THRESHOLD (mV)

0

0.5

0.75

1.0 1.25 1.5
V

VOLTAGE (V)

RNG

Feedback Reference Voltage

vs Temperature

0.62

0.61

0.60

6

0.59

FEEDBACK REFERENCE VOLTAGE (V)

0.58
–50

–25 0 25 50

TEMPERATURE (°C)

1.75 2.0

3714 G10

MAXIMUM CURRENT SENSE THRESHOLD (mV)

0

75 100 125

3714 G12

1.5

2 2.5 3 3.5

RUN/SS VOLTAGE (V)

MAXIMUM CURRENT SENSE THRESHOLD (mV)

3714 G23

100

–50 –25

0

TEMPERATURE (°C)

Error Amplifier gm vs Temperature

2.0

1.8

1.6

(mS)

m

g

1.4

1.2

1.0
–50 –25

0

TEMPERATURE (°C)

50

25

50

25

75

100

75

125

3714 G13

100

125

3714 G11

3714f

TEMPERATURE (°C)

–50 –25

0

EXTV

CC

SWITCH RESISTANCE (Ω)

4

10

0

50

75

3714 G14

2

8

6

25

100

125

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LTC3714

Input and Shutdown Currents

vs Input Voltage

1200

1000

INPUT CURRENT (µA)

800

600

400

200

0

0

510

EXTVCC OPEN

SHUTDOWN

EXTVCC = 5V

15 25

INPUT VOLTAGE (V)

FCB Pin Current vs Temperature

0

–0.25

–0.50

–0.75

–1.00

FCB PIN CURRENT (µA)

–1.25

20 30 35

3714 G24

EXTVCC Switch Resistance

INTVCC Load Regulation

–0.1

–0.2

(%)

CC

–0.3

∆INTV

–0.4

–0.5

0

10

0

INTVCC LOAD CURRENT (mA)

30

40

20

50

3714 G25

60

50

SHUTDOWN CURRENT (µA)

40

30

20

10

0

vs Temperature

RUN/SS Pin Current

vs Temperature

3

2

PULL-DOWN CURRENT

1

0

FCB PIN CURRENT (µA)

–1

PULL-UP CURRENT

–1.50

5.0

4.5

4.0

3.5

RUN/SS THRESHOLD (V)

3.0

50 100 125

–50

–25 0

25 75

TEMPERATURE (°C)

RUN/SS Latchoff Thresholds

vs Temperature

LATCHOFF ENABLE

LATCHOFF THRESHOLD

–50

–25 0 25 50

TEMPERATURE (°C)

75 100 125

3714 G15

3714 G17

–2

–50 –25

0

TEMPERATURE (°C)

50

25

75

Undervoltage Lockout Threshold

vs Temperature

4.0

3.5

3.0

2.5

UNDERVOLTAGE LOCKOUT THRESHOLD (V)

2.0
–50

–25 0 25 50

TEMPERATURE (C)

75 100 125

100

125

3714 G16

3714 G18

3714f

7

LTC3714

UUU

PI FU CTIO S

BG (Pin 1): Bottom Gate Drive. Drives the gate of the

bottom N-channel MOSFET between ground and INTVCC.

PGND (Pin 2): Power Ground. Connect this pin closely to

the bottom of the sense resistor or if no sense resistor is
used, to the source of the bottom N-channel MOSFET, the
(–) terminal of C

SENSE (Pin 3): Current Sense Comparator Input. The (+)

input to the current comparator is normally connected to
the SW node unless using a sense resistor (see Applica­tions Information).

SW (Pin 4): Switch Node. The (–) terminal of the bootstrap

capacitor CB connects here. This pin swings from a diode
voltage drop below ground up to VIN.

TG (Pin 5): Top Gate Drive. Drives the top N-channel

MOSFET with a voltage swing equal to INTVCC superim­posed on the switch node voltage SW.

BOOST (Pin 6): Boosted Floating Driver Supply. The (+)

terminal of the bootstrap capacitor CB connects here. This
pin swings from a diode voltage drop below INTVCC up to
V

+ INTVCC.

IN

VID0-VID4 (Pins 7, 8, 9, 24, 25): VID Digital Inputs. The

voltage identification (VID) code sets the internal feedback
resistor divider ratio for different output voltages as shown
in Table 1. If unconnected, the pins are pulled high by
internal 2.5µA current sources.

RUN/SS (Pin 10): Run Control and Soft-Start Input. A

capacitor to ground at this pin sets the ramp time to full
output current (approximately 3s/µF) and the time delay
for overcurrent latchoff (see Applications Information).
Forcing this pin below 0.8V shuts down the device.

and the (–) terminal of CIN.

VCC

mum output current and can be set from 0.5V to 2V by a
resistive divider from INTVCC. The sense voltage defaults
to 70mV when this pin is tied to ground, 140mV when tied
to INTVCC.

I

(Pin 14): Current Control Threshold and Error Ampli-

TH

fier Compensation Point. The current comparator thresh­old increases with this control voltage. The voltage ranges
from 0V to 2.4V with 0.8V corresponding to zero sense
voltage (zero current).

OPVIN (Pin 15): Internal Op Amp Supply. Connect to

INTVCC or a separate supply greater than 5V.

OP– (Pin 16): Negative Input of the Internal Op Amp.
OP+ (Pin 17): Positive Input of the Internal Op Amp.
OPOUT (Pin 18): Output of the Internal Op Amp.
SGND (Pin 19): Signal Ground. All small-signal compo-

nents and compensation components should connect to
this ground, which in turn connects to PGND at one point.

FCB (Pin 20): Forced Continous Input. Tie this pin to

ground to force continuous synchronous operation at low
load, to INTVCC to enable discontinuous mode operation
at low load or to a resistive divider from a secondary output
when using a secondary winding.

ION (Pin 21): On-Time Current Input. Tie a resistor from

VIN to this pin to set the one-shot timer current and thereby
set the switching frequency.

VFB (Pin 22): Error Amplifier Feedback Input. This pin

connects to both the error amplifier input and to the output
of the internal resistive divider. It can be used to attach
additional compensation components if desired.

VON (Pin 11): On-Time Voltage Input. Voltage trip point for

the on-time comparator. Tying this pin to the output
voltage makes the on-time proportional to V
comparator input defaults to 0.7V when the pin is grounded,

2.4V when the pin is tied to INTVCC.

PGOOD (Pin 12): Power Good Output. Open drain logic

output that is pulled to ground when the output voltage is
not within ±10% of the regulation point.

V

(Pin 13): Sense Voltage Range Input. The voltage at

RNG

this pin is ten times the nominal sense voltage at maxi-

OUT

. The

8

V

OSENSE

voltage connects here to the input of the internal resistive
feedback divider.

EXTVCC (Pin 26): External V

ceeds 4.7V, an internal switch connects this pin to INTV
and shuts down the internal regulator so that controller
and gate drive power is drawn from EXTVCC. Do not exceed
7V at this pin and ensure that EXTVCC < VIN.

VIN (Pin 27): Main Input Supply. Decouple this pin to

SGND with an RC filter (1Ω, 0.1µF).

(Pin 23): Output Voltage Sense. The output

Input. When EXTVCC ex-

CC

CC

3714f

UUU

PI FU CTIO S

LTC3714

INTVCC (Pin 28): Internal 5V Regulator Output. The driver

and control circuits are powered from this voltage. De-

U

U

W

FU CTIO AL DIAGRA

R

ON

0.7V

11

1

tON = (10pF)

1.4V

V

RNG

13

0.7V

V

OST

ON

V

I

I

CMP

VON
ION

2.4V

21

+

–

X

(0.5 TO 2)

I

20k

FCB

1µA

20

4.7V

+

0.6V

+

–

F

ON

R
SQ

+

I

REV

–

couple this pin to power ground with a minimum of 4.7µF
tantalum or other low ESR capacitor.

V

IN

C

IN

M1

L1

V

OUT

+

C

M2

OUT

–

FCNT

SHDN

V

0.6V
REF

REG

27

IN

+

5V

BOOST

6

C

TG

B

5

SW

4

SENSE

3

INTV

CC

28

C

VCC

BG

1

PGND

2

PGOOD

12

EXTV

26

CC

ON

SWITCH

LOGIC

OV

240k

×5.3

3.3µA

V

OSENSE

1

Q4

Q2

Q6

Q3

Q1

+

0.8V

–

EA

–

+

0.6V

1V

Q5

+

OP AMP

–

0.4V

RUN

SHDN

RUN/SS

10

OPV

15

IN

OPOUT

18

SGND

19

SS

–

+

+

–

0.6V

C

C1

I

14

TH

R

C

+

OP

17

–

OP

16

UV

OV

1.2µA

0.54V

+

–

+

0.66V

–

6V

C

SS

R2
10k

5× (ALL VID PINS)

INTV

CC

VID

DAC

R1

22 19

FB

23

2.5µA

7

8

9

24

25

SGNDV

3714 FD

VID0

VID1

VID2

VID3

VID4

3714f

9