Datasheet

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LTC1693

TYPICAL APPLICATION

DESCRIPTIO

FEATURES

APPLICATIO S

High Speed Single/Dual

N-Channel MOSFET Drivers

■

Dual MOSFET Drivers in SO-8 Package

or Single MOSFET Driver in MSOP Package

■

1GΩ Electrical Isolation Between the Dual Drivers

Permits High/Low Side Gate Drive

■

1.5A Peak Output Current

■

16ns Rise/Fall Times at V

= 12V, C

= 1nF

■

Wide V

Range: 4.5V to 13.2V

■

CMOS Compatible Inputs with Hysteresis,

Input Thresholds are Independent of V

■

Driver Input Can Be Driven Above V

■

Undervoltage Lockout

■

Thermal Shutdown

The LTC

1693 family drives power N-channel MOSFETs

at high speed. The 1.5A peak output current reduces

switching losses in MOSFETs with high gate capacitance.

The LTC1693-1 contains two noninverting drivers while

the LTC1693-2 contains one noninverting and one invert-

ing driver. These dual drivers are electrically isolated and

independent. The LTC1693-3 is a single driver with an

output polarity select pin.

All MOSFET drivers offer V

independent CMOS input

thresholds with 1.2V of typical hysteresis. They can level-

shift the input logic signal up or down to the rail-to-rail V

drive for the external MOSFET.

The LTC1693 contains an undervoltage lockout circuit and

a thermal shutdown circuit that disable the external

N-channel MOSFET gate drive when activated.

The LTC1693-1 and LTC1693-2 come in an 8-lead SO pack-

age. The LTC1693-3 comes in an 8-lead MSOP package.

■

Power Supplies

■

High/Low Side Drivers

■

Motor/Relay Control

■

Line Drivers

■

Charge Pumps

Two Transistor Forward Converter

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

12V

BOOST

SENSE

–

PHASE

RUN/SHDN

R6 100Ω

R7 100Ω

BAT54

301k

5.1Ω

R10

10k

C15

0.1µF

C14

3300pF

C11

0.1µF

C12

100pF

1µF

4700pF

25V

0.1µF

1.5µH

13:2

OUT

1.5V/15A

RETURN

1693 TA01

C13

1µF

C1: SANYO 63MV330GX

C2: WIMA SMD4036/1.5/63/20/TR

C6: KEMET T510X477M006AS (×8)

L1: GOWANDA 50-318

T1: GOWANDA 50-319

1µF

C10

0.1µF

1800pF

NPO

12k

2.49k

12V

RETURN

48VDC

±10%

SYNC

REF

SL/ADJ

AVG

REF

PGNDSGND

LT1339

LTC1693CS8-2

MURS120

IN1

GND1

IN2

GND2

CC1

OUT1

CC2

OUT2

LTC1693CS8-2

IN1

GND1

IN2

GND2

CC1

OUT1

CC2

OUT2

MBRO530T1

MURS120

MTD20NO6HD

MURS120

1.5µF

63V

330µF

63V

MTD20NO6HD

Si4420

0.068Ω

Si4420

×2

470µF

6.3V

×8

249Ω

1.24k

••

Summary of content (20 pages)

PAGE 1
LTC1693 High Speed Single/Dual N-Channel MOSFET Drivers U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®1693 family drives power N-channel MOSFETs at high speed. The 1.5A peak output current reduces switching losses in MOSFETs with high gate capacitance. Dual MOSFET Drivers in SO-8 Package or Single MOSFET Driver in MSOP Package 1GΩ Electrical Isolation Between the Dual Drivers Permits High/Low Side Gate Drive 1.5A Peak Output Current 16ns Rise/Fall Times at VCC = 12V, CL = 1nF Wide VCC Range: 4.
PAGE 2
LTC1693 U W W W ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (VCC) .............................................. 14V Inputs (IN, PHASE) ................................... – 0.3V to 14V Driver Output ................................. – 0.3V to VCC + 0.3V GND1 to GND2 (Note 5) ..................................... ±100V Junction Temperature .......................................... 150°C Operating Ambient Temperature Range C-Grade ...................................................
PAGE 3
LTC1693 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Timing (Note 4) tRISE Output Rise Time COUT = 1nF COUT = 4.7nF ● ● 17.5 48.0 35 85 ns ns tFALL Output Fall Time COUT = 1nF COUT = 4.7nF ● ● 16.5 42.0 35 75 ns ns tPLH Output Low-High Propagation Delay COUT = 1nF COUT = 4.7nF ● ● 38.
PAGE 4
LTC1693 U W TYPICAL PERFOR A CE CHARACTERISTICS PHASE Threshold Voltage vs VCC Rise/Fall Time vs VCC 24 TA = 25°C 5 VPH(H) Rise/Fall Time vs Temperature 3 2 tRISE 17 tRISE 18 tFALL 16 tFALL 16 15 14 13 14 12 1 12 0 10 5 6 7 9 8 VCC (V) 10 11 12 11 5 6 7 9 8 VCC (V) 10 11 1693 G04 10 –50 –25 12 Rise/Fall Time vs COUT TA = 25°C VCC = 12V 100 fIN = 100kHz 45 TIME (ns) 40 40 45 40 tPHL 35 30 25 1000 5 6 7 8 9 VCC (V) 10 1693 G07 200 OUTPUT SATURATION VOLTAGE (m
PAGE 5
LTC1693 U W TYPICAL PERFOR A CE CHARACTERISTICS Switching Supply Current vs COUT (Single Driver) VOL vs Output Current 300 TA = 25°C VCC = 12V 90 VCC = 12V TA = 25°C 250 80 70 200 60 VOL (mV) SWITCHING SUPPLY CURRENT (mA) 100 50 40 30 750kHz 20 10 200kHz 100kHz 25kHz VOL 150 100 50 500kHz 0 0 1 10 100 COUT (pF) 1000 10000 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 1693 G13 1693 G14 VOH vs Output Current 300 Thermal Derating Curves 1400 TA = 25°C VCC = 12V TJ = 125°C
PAGE 6
LTC1693 U U U PIN FUNCTIONS SO-8 Package (LTC1693-1, LTC1693-2) MSOP Package (LTC1693-3) IN1, IN2 (Pins 1, 3): Driver Inputs. The inputs have VCC independent thresholds with 1.2V typical hysteresis to improve noise immunity. IN (Pin 1): Driver Input. The input has VCC independent thresholds with hysteresis to improve noise immunity. GND1, GND2 (Pins 2, 4): Driver Grounds. Connect to a low impedance ground. The VCC bypass capacitor should connect directly to this pin.
PAGE 7
LTC1693 TEST CIRCUITS 1/2 LTC1693-1 OR 1/2 LTC1693-2 87V VCC1 4.7µF 12VP-P 0.1µF 1 4.7nF IN1 OUT1 8 7 75V A 1/2 LTC1693-1 OR 1/2 LTC1693-2 2 GND1 VCC2 12V 4.7µF + – 0.1µF 75V 3 IN2 OUT2 6 5 4.7nF 4 1693 TC03 GND2 1693 TC02 75V High Side Switching Test LTC1693-1, LTC1693-2 Ground Isolation Test VCC = 12V 4.7µF 0.1µF IN OUT 5V 1nF OR 4.
PAGE 8
LTC1693 U W U U APPLICATIONS INFORMATION Overview The LTC1693 single and dual drivers allow 3V- or 5V-based digital circuits to drive power MOSFETs at high speeds. A power MOSFET’s gate-charge loss increases with switching frequency and transition time. The LTC1693 is capable of driving a 1nF load with a 16ns rise and fall time using a VCC of 12V. This eliminates the need for higher voltage supplies, such as 18V, to reduce the gate charge losses.
PAGE 9
LTC1693 U U W U APPLICATIONS INFORMATION Driver Electrical Isolation The LTC1693-1 and LTC1693-2 incorporate two individual drivers in a single package that can be separately connected to GND and VCC connections. Figure 2 shows a circuit with an LTC1693-2, its top driver left floating while the bottom Power Dissipation VIN LTC1693-2 VCC1 IN1 OUT1 driver is powered with respect to ground.
PAGE 10
LTC1693 U W U U APPLICATIONS INFORMATION corresponding to MOSFET’s VGS value (VCC in this case) can be readily obtained from the manafacturer’s QGS vs VGS curves: VCC LTC1693 Load Capacitive Power (MOS) = (VCC)(QG)(f) Transition state power losses are due to both AC currents required to charge and discharge the drivers’ internal nodal capacitances and cross-conduction currents in the internal gates.
PAGE 11
GND VIN 5V + + C7 0.1µF 25V +V1 CIN2 330µF 6.3V C12 1nF 5% C4 0.1µF C11 120pF 5% NPO R4 43k CIN1 330µF 6.3V 4 3 2 1 8 7 6 5 4 3 2 1 SGND VIN VFB SENSE + C1 100pF VCC2 OUT2 GND2 GND1 IN2 VCC1 OUT1 IN1 R1 10k U1 LTC1693-2 SENSE – ITH SHDN LBIN BINH CT LBOUT PGND BDRIVE PINV PWR VIN TDRIVE U2 LTC1266A 5 6 7 8 9 10 11 12 13 14 15 16 C3 0.1µF C5 1nF R2 100Ω D3 MMSD4148 + VIN D2 MMSD4148 R5 100Ω R3 0.010Ω 5 10 C2 0.
PAGE 12
LTC1693 U TYPICAL APPLICATIONS Negative-to-Positive Synchronous Boost Converter + D2 MBRO530 VS L2** 1µH VOUT 3.3V 6A C3 330µF 6.3V ×2 + + C1 330µF 6.3V ×5 C2 330µF 6.3V ×5 R1 0.015Ω 1W C12 4700pF L1* 4.8µH R2 0.015Ω 1W Q2 Si4420 ×2 5 C14 10µF 16V 3 D4 MBRO530 D3 MBRO530 D5 MBRO530 7 R19 1k C17 100pF 9 + 1 U2A LTC1693-2 2 C16 10µF 16V C15 0.1µF 2 3 + C6 10µF 16V 4 5 6 C5 0.1µF 8 SENSE – SENSE – TDRV PWR VIN BDRV PINV U1 LTC1266 BINH VIN SHDN CT C7 390pF C9 0.
PAGE 13
+ R4 390Ω C6 100pF NPO RCL 6.8k 4 3 2 1 WINDING # TURNS AWG 28 T1A 3 28 T1B 1 28 T1C 2 28 3 T1D 28 9 T1E 28 32 T1F T1 TRANSFORMER COILTRONICS VP4-TYPE D10 1N4148 CC2 100pF 5% C2 0.1µF GND2 5 6 7 8 + V1 C5 1nF R11 12.1k R5 100Ω T1 WINDING ORDER: 1. T1A, T1B, T1C, T1D QUAD-FILAR, WOUND FIRST, AFTER T1A, T1B, T1C AND T1D WOUND, REMOVE 2 TURNS FROM T1B AND 1 TURN FROM T1C 2. T1E WOUND ON TOP, SPREAD EVENLY 3. LAYER OF INSULATION 4.
PAGE 14
C1 1.2µF 100V CER 68µF 20V AVX TSPE 10k P + 100k 0.1µF P 3.9k GND1 IN1 20 PHASE JP3 W2 T1 2 W3 2 7 5 6 18 1 RUN/SHDN 12VIN 2.2µF 19 OUT1 VCC1 470Ω OUT2 IN2 VCC2 LTC1693-1 GND2 JP2 100k 14 13 17 1 8 3 4 12V 5VOUT SHORT JP3, OPEN JP2 3.3VOUT, SHORT JP2, OPEN JP3 BAS21 BAS21 BAS21 13k MMBD914LT1 C2 1.2µF 100V CER COILCRAFT DO1608-105 36k +VIN –VIN INPUT 36V TO 75V +VIN +VIN BAT54 2.
PAGE 15
LTC1693 U TYPICAL APPLICATIONS 5V to 12V Boost Converter R2 13k 1% D1 BAT85 R1 7.5k 1% + C2 0.1µF C3 4.
PAGE 16
LTC1693 U TYPICAL APPLICATIONS Charge Pump Doubler R1 11k 1% VCC = 5V VCC = 5V C2 1µF C3 1µF 8 1 C1 680pF D1 1N5817 D2 1N5817 7 LTC1693-3 VOUT + 3 CL 47µF 4 1693 TA07a R1, C1 SET THE OSCILLATION FREQUENCY AT 150kHz AND THE DUTY CYCLE AT 35% Efficiency Output Voltage 100 12 VCC = 5V VCC = 5V 80 8 EFFICIENCY (%) OUTPUT VOLTAGE (V) 10 6 4 40 20 2 0 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 1693 TA07b 16 60 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 16
PAGE 17
LTC1693 U TYPICAL APPLICATIONS Charge Pump Inverter R1 11k 1% VCC = 5V C2 1µF C3 1µF 8 C1 680pF 7 LTC1693-3 3 4 + 1 D2 1N5817 D1 1N5817 CL 47µF VOUT 1693 TA08a R1, C1 SET THE OSCILLATION FREQUENCY AT 150kHz AND THE DUTY CYCLE AT 35% Efficiency Output Voltage 0 100 VCC = 5V VCC = 5V 80 –2 EFFICIENCY (%) OUTPUT VOLTAGE (V) –1 –3 –4 60 40 20 –5 –6 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 1693 TA08b 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 1693 TA08c
PAGE 18
LTC1693 U TYPICAL APPLICATIONS Charge Pump Tripler R1 11k 1% VCC = 5V VCC = 5V C2 1µF C3 1µF 8 1 C1 680pF D3 1N5817 D4 1N5817 7 LTC1693-3 3 4 D1 1N5817 D2 1N5817 C5 1µF + + C4 3.
PAGE 19
LTC1693 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.118 ± 0.004* (3.00 ± 0.102) 8 7 6 5 0.118 ± 0.004** (3.00 ± 0.102) 0.192 ± 0.004 (4.88 ± 0.10) 1 2 3 4 0.040 ± 0.006 (1.02 ± 0.15) 0.007 (0.18) 0.034 ± 0.004 (0.86 ± 0.102) 0° – 6° TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP 0.021 ± 0.006 (0.53 ± 0.015) 0.006 ± 0.004 (0.15 ± 0.
PAGE 20
LTC1693 U TYPICAL APPLICATION Isolated Push-Pull DC/DC Converter R1 6.2k C3 0.1µF C4 1µF C2 0.1µF 74HC14 + T1B 1 10 14 12 11 12 7 PRESET D LTC1693-2 7 Q1 Si4410 Q Q 2 8 GND 6 3 7 LTC1693-2 5 R2 10Ω Q2 Si4410 2 • T1D 24T #32 • 9 T1E 24T 8 #28 • T1C 3 24T #32 4 C5 2.2nF 100V ×2 9 1• 24T #32 2 13 CLR 74HC74 C6 330µF 6.3V 8 1 14 C1 390pF T1A 24T #32 VCC = 5V VCC = 5V 13 VCC = 5V C7 2.