Datasheet
LTC3721-1
2
sn37211 37211fs
V
CC
to GND (Low Impedance Source) .......–0.3V to 10V
(Chip Self-Regulates at 10.3V)
UVLO to GND............................................. –0.3V to V
CC
All Other Pins to GND
(Low Impedance Source) .........................–0.3V to 5.5V
V
CC
(Current Fed) ................................................. 40mA
ORDER PART
NUMBER
GN PART
MARKING
T
JMAX
= 125°C, θ
JA
= 100°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
37211
LTC3721EGN-1
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V unless otherwise noted.
V
REF
Output Current ............................... Self-Regulated
Operating Temperature (Notes 5,6)
LTC3721-1 ......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
Lead Temperature (GN Package only)
(Soldering, 10sec) ............................................ 300°C
ORDER PART
NUMBER
UF PART
MARKING
37211
LTC3721EUF-1
T
JMAX
= 125°C, θ
JA
= 100°C/W
EXPOSED PAD IS GND
(PIN17) MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
16
15
14
13
12
11
10
9
V
REF
NC
NC
DRVB
V
CC
DRVA
GND
C
T
NC
UVLO
SS
FB
R
LEB
COMP
CS
DPRG
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply
V
CCUV
V
CC
Undervoltage Lockout Measured on V
CC
10.25 10.7 V
V
CCHY
V
CC
UVLO Hysteresis Measured on V
CC
3.8 4.2 V
I
CCST
Start-Up Current V
CC
= V
UVLO
– 0.3V ● 145 230 µA
I
CCRN
Operating Current No Load on Outputs 3 6 mA
V
SHUNT
Shunt Regulator Voltage Current into V
CC
= 10mA 10.3 10.8 V
R
SHUNT
Shunt Resistance Current into V
CC
= 10mA to 17mA 1.4 3.5 Ω
SUVLO System UVLO Threshold Measured on UVLO Pin, 10mA into V
CC
4.8 5.0 5.2 V
SHYST System UVLO Hysteresis Current Current Flows Out of UVLO Pin, 10mA into V
CC
8.5 10 11.5 µA
16
17
15 14 13
5 6 7 8
TOP VIEW
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
9
10
11
12
4
3
2
1DRVB
V
CC
DRVA
PGND
FB
R
LEB
COMP
CS
NC
V
REF
UVLO
SS
SGND
C
T
NC
DPRG