LTC3717 Datasheet, PDF (20/20 Pages) Linear Technology – Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination

LTC3717
TYPICAL APPLICATIO
Typical Application 1.25V/±3A at 1.4MHz
C_SS
0.1µF
LTC3717
1 _RUN/SS
16
BOOST
R_PG
100k _{2 PGOOD}
15
TG
C_C1
470pF
R_C
33k
C_C2
100pF
C_ON, 0.01µF
R_ON
92k
3
V_RNG
4
I_TH
5 _SGND
6
I_ON
7
V_FB
8
V_REF
14
SW
13
PGND
12
BG
11
INTV_CC
10
V_CC
9
EXTV_CC
D_B
CMDSH-3
C_B
0.22µF
C_VCC
4.7µF
5V
1µF
M1
1/2 Si9802
L1
0.7µH
M2
1/2 Si9802
C_IN, C_OUT: CORNELL DUBILIER ESRD121M04B
L1: TOKO A921CY-0R7M
V_IN
+
2.5V
C_IN
120µF
4V _VOUT
1.25V
±3A
+ C_OUT
120µF
4V
3717 TA03
RELATED PARTS
PART NUMBER
LTC1625/LTC1775
LTC1628-PG
DESCRIPTION
No R_SENSE^TM Current Mode Synchronous Step-Down Controller
Dual, 2-Phase Synchronous Step-Down Controller
LTC1628-SYNC
LTC1709-7
LTC1709-8
LTC1735
Dual, 2-Phase Synchronous Step-Down Controller
High Efficiency, 2-Phase Synchronous Step-Down Controller
with 5-Bit VID
High Efficiency, 2-Phase Synchronous Step-Down Controller
High Efficiency, Synchronous Step-Down Controller
LTC1736
LTC1772
LTC1773
High Efficiency, Synchronous Step-Down Controller with 5-Bit VID
SOT-23 Step-Down Controller
Synchronous Step-Down Controller
LTC1778/LTC3778 Wide Operating Range, No R_SENSE Step-Down Synchronous Controllers
LTC1874
Dual, Step-Down Controller
LTC1876
2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
LTC3413
Monolithic DDR Memory Termination Regulator
Burst Mode is a registered trademark of Linear Technology Corporation.
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
COMMENTS
97% Efficiency; No Sense Resistor; 99% Duty Cycle
Power Good Output; Minimum Input/Output Capacitors;
3.5V ≤ V_IN ≤ 36V
Synchronizable 150kHz to 300kHz
Up to 42A Output; 0.925V ≤ V_OUT ≤ 2V
Up to 42A Output; VRM 8.4; 1.3V ≤ V_OUT ≤ 3.5V
Burst Mode^TM Operation; 16-Pin Narrow SSOP;
3.5V ≤ V_IN ≤ 36V
Mobile VID; 0.925V ≤ V_OUT ≤ 2V; 3.5V ≤ V_IN ≤ 36V
Current Mode; 550kHz; Very Small Solution Size
Up to 95% Efficiency, 550kHz, 2.65V ≤ V_IN ≤ 8.5V,
0.8V ≤ V_OUT ≤ V_IN, Synchronizable to 750kHz
4V ≤ V_IN ≤ 36V, True Current Mode Control,
2% to 90% Duty Cycle
Current Mode; 550kHz; Small 16-Pin SSOP, V_IN < 9.8V
2.6V ≤ V_IN ≤ 36V, Power Good Output,
300kHz Operation
90% Efficiency, ±3A Output, 2MHz Operation
sn3717 3717fs
LT/TP 0103 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001