Datasheet

LTC3734
2
3734fa
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (PV
CC
, SV
CC
) ............. 7V to –0.3V
Topside Driver Voltages (BOOST)
.............. 38V to –0.3V
Switch Voltage (SW)
..................................... 32V to –5V
Boosted Driver Voltages (BOOST-SW)
......... 7V to –0.3V
DPRSLPVR, STP_CPUB, MCH_PG, PGOOD,
RDPRSLP, RDPSLP, RBOOT Voltages
......... 5V to –0.3V
RUN/SS, FREQSET, PSIB Voltages
.............. 7V to – 0.3V
VID0-VID5 Voltages
....................................5V to –0.3V
V
FB
Voltage ................................................. 2V to –0.3V
V
OA
+
, V
OA
Voltage ....................................3.6V to –0.3V
Peak Gate Drive Current <1µs (TG, BG)
......................5A
Operating Ambient Temperature Range
(Note 2)
................................................... 40°C to 85°C
Junction Temperature (Note 3)
............................. 125°C
Storage Temperature Range
................... –65°C to 125°C
Reflow Peak Body Temperature
............................ 245°C
(Note 1)
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
PVCC
= V
SVCC
= 5V, V
RUN/SS
= 5V unless otherwise noted.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3734EUH#PBF LTC3734EUH#TRPBF 3734
32-Lead Plastic (5mm × 5mm) QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PIN CONFIGURATION
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1V
OA
+
V
OA
OAOUT
STP_CPUB
SGND
SENSE
+
SENSE
RDPRSLP
TG
SW
PV
CC
BG
PGND
VID5
VID4
VID3
PSIB
FREQSET
DPRSLPVR
SV
CC
V
FB
MCH_PG
PGOOD
BOOST
RDPSLP
RUN/SS
I
TH
RBOOT
VID0
VID1
VID2
NC
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
33
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
Reference Regulated Feedback Voltage I
TH
Voltage = 0.5V; Measured at V
FB
(Note 4) 0.600 V
V
SENSEMAX
Maximum Current Sense Threshold I
TH
Voltage = Max; V
CM
= 1.7V
l
59 72 85 mV
V
LOADREG
Output Voltage Load Regulation (Note 4)
Measured in Servo Loop, ∆I
TH
Voltage: 1.2V to 0.7V
Measured in Servo Loop, ∆I
TH
Voltage: 1.2V to 2V
l
l
0.1
–0.1
0.5
–0.5
%
%
V
REFLNREG
Reference Voltage Line Regulation V
PVCC
= V
SVCC
= 4.5V to 7V 0.02 0.1 %/V
V
PSIB
Forced Continuous Threshold 0.57 0.6 0.63 V
I
PSIB
Forced Continuous Current V
PSIB
= 0V –0.5 –1 µA
V
OVL
Output Overvoltage Threshold Measured with Respect to V
FB
= 0.6V 0.64 0.66 0.68 V
g
m
Transconductance Amplifier g
m
I
TH
= 1.2V, Sink/Source 25µA (Note 4)
l
4.5 6 7.5 mmho
g
mOL
Transconductance Amplifier Gain I
TH
= 1.2V, (g
m
• Z
L
; No Ext Load) (Note 4) 3 V/mV
V
ACTIVE
Output Voltage in Active Mode VID = 010110, I
TH
= 0.5V (0°C – 85°C)
VID = 010110, I
TH
= 0.5V (Note 2)
l
1.342
1.336
1.356
1.356
1.370
1.376
V
V