LTC3705_15 Datasheet, PDF (2/20 Pages) Linear Technology – 2-Switch Forward Controller and Gate Driver

LTC3705
ABSOLUTE AXI U RATI GS
(Note 1)
Power Supply (V_CC) ...................................– 0.3V to 15V
External NMOS Drive (NDRV) ....................– 0.3V to 20V
NDRV to V_CC ........................................................... – 0.3V to 5V
Bootstrap Supply (BOOST) ......................– 0.3V to 115V
Top Source (TS) .......................................... -5V to 100V
BOOST to TS .............................................– 0.3V to 15V
Soft-Start Fault, Feedback,
Frequency Set, Transformer
Inputs (SSFLT, FB/IN⁺, FS/IN^–) ..................– 0.3V to 15V
All Other Pins (V_SLMT, I_S, UVLO) .................– 0.3V to 5V
Peak Output Current <1µs (TG, BG) ........................... 2A
Operating Ambient Temperature Range .. – 40°C to 85°C
Operating Junction Temperature (Note 2) ............ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
GND 1
I_S 2
V_SLMT 3
UVLO 4
SSFLT 5
NDRV 6
FB/IN⁺ 7
FS/IN^– 8
TOP VIEW
16 TS
15 TG
14 BOOST
13 NC
12 NC
11 V_CC
10 BG
9 PGND
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
T_JMAX = 125°C, θ_JA = 110°C/W
ORDER PART
NUMBER
LTC3705EGN
LTC3705IGN
GN PART
MARKING
3705
3705I
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_BOOST = 12V, GND = PGND = V_TS = 0V, T_A = 25°C, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
V_CC Supply, Linear Regulator and Trickle Charger Shunt Regulator
V_CCOP
Operating Voltage Range
7
V_CCLR
Output Voltage
Linear Regulator in Operation
I_NDRV
Current into NDRV Pin
Linear Regulator in Operation
0.1
t_r(VCC)
Rise Time of V_CC
Linear Regulator Charging (0.5V to 7.5V)
I_NDRVTO
Linear Regulator Time Out Current Threshold Primary-Side Operation
I_CC
Supply Current
V_UVLO = 1.5V, Linear Regulator in
Operation (Note 3)
I_CCM
V_CCSR
I_CCSR
Maximum Supply Current
Maximum Supply Voltage
Minimum Current into NDRV/V_CC
V_UVLO = 1.5V, Trickle Charger in Operation,
V_CC = 13.2V (Note 3)
Trickle Charger Shunt Regulator
Trickle Charger Shunt Regulator, V_CC = 15V
10
(Note 3)
Internal Undervoltage
V_CCUV
Internal Undervoltage Threshold
Gate Drive Undervoltage
V_CC Rising
V_CC Falling
V_GDUV
Gate Drive Undervoltage Threshold
Undervoltage Lockout (UVLO)
V_CC Rising (Linear Regulator)
V_CC Rising (Trickle Charger)
V_CC Falling
● 7.2
● 13.1
● 6.8
V_UVLOR
V_UVLOF
Undervoltage Lockout Threshold Rising
Undervoltage Lockout Threshold Falling
Rising
Falling
● 1.220
● 1.205
TYP
12
8
45
0.27
1.4
1.7
14.25
5.3
4.7
7.4
13.4
7.0
1.242
1.226
MAX
15
1
2.1
2.5
15
7.7
14
7.2
1.280
1.265
UNITS
V
V
mA
µs
mA
mA
mA
V
mA
V
V
V
V
V
V
V
3705fb
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